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-rw-r--r--polux/application/busybox/shell/hush.c3952
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diff --git a/polux/application/busybox/shell/hush.c b/polux/application/busybox/shell/hush.c
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+++ b/polux/application/busybox/shell/hush.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * sh.c -- a prototype Bourne shell grammar parser
+ * Intended to follow the original Thompson and Ritchie
+ * "small and simple is beautiful" philosophy, which
+ * incidentally is a good match to today's BusyBox.
+ *
+ * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
+ *
+ * Credits:
+ * The parser routines proper are all original material, first
+ * written Dec 2000 and Jan 2001 by Larry Doolittle. The
+ * execution engine, the builtins, and much of the underlying
+ * support has been adapted from busybox-0.49pre's lash, which is
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
+ * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
+ * Troan, which they placed in the public domain. I don't know
+ * how much of the Johnson/Troan code has survived the repeated
+ * rewrites.
+ *
+ * Other credits:
+ * b_addchr() derived from similar w_addchar function in glibc-2.2
+ * setup_redirect(), redirect_opt_num(), and big chunks of main()
+ * and many builtins derived from contributions by Erik Andersen
+ * miscellaneous bugfixes from Matt Kraai
+ *
+ * There are two big (and related) architecture differences between
+ * this parser and the lash parser. One is that this version is
+ * actually designed from the ground up to understand nearly all
+ * of the Bourne grammar. The second, consequential change is that
+ * the parser and input reader have been turned inside out. Now,
+ * the parser is in control, and asks for input as needed. The old
+ * way had the input reader in control, and it asked for parsing to
+ * take place as needed. The new way makes it much easier to properly
+ * handle the recursion implicit in the various substitutions, especially
+ * across continuation lines.
+ *
+ * Bash grammar not implemented: (how many of these were in original sh?)
+ * $_
+ * ! negation operator for pipes
+ * &> and >& redirection of stdout+stderr
+ * Brace Expansion
+ * Tilde Expansion
+ * fancy forms of Parameter Expansion
+ * aliases
+ * Arithmetic Expansion
+ * <(list) and >(list) Process Substitution
+ * reserved words: case, esac, select, function
+ * Here Documents ( << word )
+ * Functions
+ * Major bugs:
+ * job handling woefully incomplete and buggy (improved --vda)
+ * reserved word execution woefully incomplete and buggy
+ * to-do:
+ * port selected bugfixes from post-0.49 busybox lash - done?
+ * finish implementing reserved words: for, while, until, do, done
+ * change { and } from special chars to reserved words
+ * builtins: break, continue, eval, return, set, trap, ulimit
+ * test magic exec
+ * handle children going into background
+ * clean up recognition of null pipes
+ * check setting of global_argc and global_argv
+ * control-C handling, probably with longjmp
+ * follow IFS rules more precisely, including update semantics
+ * figure out what to do with backslash-newline
+ * explain why we use signal instead of sigaction
+ * propagate syntax errors, die on resource errors?
+ * continuation lines, both explicit and implicit - done?
+ * memory leak finding and plugging - done?
+ * more testing, especially quoting rules and redirection
+ * document how quoting rules not precisely followed for variable assignments
+ * maybe change charmap[] to use 2-bit entries
+ * (eventually) remove all the printf's
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+
+#include <glob.h> /* glob, of course */
+#include <getopt.h> /* should be pretty obvious */
+/* #include <dmalloc.h> */
+
+#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
+
+
+#if !BB_MMU && ENABLE_HUSH_TICK
+//#undef ENABLE_HUSH_TICK
+//#define ENABLE_HUSH_TICK 0
+#warning On NOMMU, hush command substitution is dangerous.
+#warning Dont use it for commands which produce lots of output.
+#warning For more info see shell/hush.c, generate_stream_from_list().
+#endif
+
+#if !BB_MMU && ENABLE_HUSH_JOB
+#undef ENABLE_HUSH_JOB
+#define ENABLE_HUSH_JOB 0
+#endif
+
+#if !ENABLE_HUSH_INTERACTIVE
+#undef ENABLE_FEATURE_EDITING
+#define ENABLE_FEATURE_EDITING 0
+#undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
+#define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
+#endif
+
+
+/* If you comment out one of these below, it will be #defined later
+ * to perform debug printfs to stderr: */
+#define debug_printf(...) do {} while (0)
+/* Finer-grained debug switches */
+#define debug_printf_parse(...) do {} while (0)
+#define debug_print_tree(a, b) do {} while (0)
+#define debug_printf_exec(...) do {} while (0)
+#define debug_printf_jobs(...) do {} while (0)
+#define debug_printf_expand(...) do {} while (0)
+#define debug_printf_clean(...) do {} while (0)
+
+#ifndef debug_printf
+#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
+#endif
+
+#ifndef debug_printf_parse
+#define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__)
+#endif
+
+#ifndef debug_printf_exec
+#define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__)
+#endif
+
+#ifndef debug_printf_jobs
+#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
+#define DEBUG_SHELL_JOBS 1
+#endif
+
+#ifndef debug_printf_expand
+#define debug_printf_expand(...) fprintf(stderr, __VA_ARGS__)
+#define DEBUG_EXPAND 1
+#endif
+
+/* Keep unconditionally on for now */
+#define ENABLE_HUSH_DEBUG 1
+
+#ifndef debug_printf_clean
+/* broken, of course, but OK for testing */
+static const char *indenter(int i)
+{
+ static const char blanks[] ALIGN1 =
+ " ";
+ return &blanks[sizeof(blanks) - i - 1];
+}
+#define debug_printf_clean(...) fprintf(stderr, __VA_ARGS__)
+#define DEBUG_CLEAN 1
+#endif
+
+
+/*
+ * Leak hunting. Use hush_leaktool.sh for post-processing.
+ */
+#ifdef FOR_HUSH_LEAKTOOL
+void *xxmalloc(int lineno, size_t size)
+{
+ void *ptr = xmalloc((size + 0xff) & ~0xff);
+ fprintf(stderr, "line %d: malloc %p\n", lineno, ptr);
+ return ptr;
+}
+void *xxrealloc(int lineno, void *ptr, size_t size)
+{
+ ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
+ fprintf(stderr, "line %d: realloc %p\n", lineno, ptr);
+ return ptr;
+}
+char *xxstrdup(int lineno, const char *str)
+{
+ char *ptr = xstrdup(str);
+ fprintf(stderr, "line %d: strdup %p\n", lineno, ptr);
+ return ptr;
+}
+void xxfree(void *ptr)
+{
+ fprintf(stderr, "free %p\n", ptr);
+ free(ptr);
+}
+#define xmalloc(s) xxmalloc(__LINE__, s)
+#define xrealloc(p, s) xxrealloc(__LINE__, p, s)
+#define xstrdup(s) xxstrdup(__LINE__, s)
+#define free(p) xxfree(p)
+#endif
+
+
+#define SPECIAL_VAR_SYMBOL 3
+
+#define PARSEFLAG_EXIT_FROM_LOOP 1
+#define PARSEFLAG_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
+#define PARSEFLAG_REPARSING (1 << 2) /* >= 2nd pass */
+
+typedef enum {
+ REDIRECT_INPUT = 1,
+ REDIRECT_OVERWRITE = 2,
+ REDIRECT_APPEND = 3,
+ REDIRECT_HEREIS = 4,
+ REDIRECT_IO = 5
+} redir_type;
+
+/* The descrip member of this structure is only used to make debugging
+ * output pretty */
+static const struct {
+ int mode;
+ signed char default_fd;
+ char descrip[3];
+} redir_table[] = {
+ { 0, 0, "()" },
+ { O_RDONLY, 0, "<" },
+ { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
+ { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
+ { O_RDONLY, -1, "<<" },
+ { O_RDWR, 1, "<>" }
+};
+
+typedef enum {
+ PIPE_SEQ = 1,
+ PIPE_AND = 2,
+ PIPE_OR = 3,
+ PIPE_BG = 4,
+} pipe_style;
+
+/* might eventually control execution */
+typedef enum {
+ RES_NONE = 0,
+#if ENABLE_HUSH_IF
+ RES_IF = 1,
+ RES_THEN = 2,
+ RES_ELIF = 3,
+ RES_ELSE = 4,
+ RES_FI = 5,
+#endif
+#if ENABLE_HUSH_LOOPS
+ RES_FOR = 6,
+ RES_WHILE = 7,
+ RES_UNTIL = 8,
+ RES_DO = 9,
+ RES_DONE = 10,
+ RES_IN = 11,
+#endif
+ RES_XXXX = 12,
+ RES_SNTX = 13
+} reserved_style;
+enum {
+ FLAG_END = (1 << RES_NONE ),
+#if ENABLE_HUSH_IF
+ FLAG_IF = (1 << RES_IF ),
+ FLAG_THEN = (1 << RES_THEN ),
+ FLAG_ELIF = (1 << RES_ELIF ),
+ FLAG_ELSE = (1 << RES_ELSE ),
+ FLAG_FI = (1 << RES_FI ),
+#endif
+#if ENABLE_HUSH_LOOPS
+ FLAG_FOR = (1 << RES_FOR ),
+ FLAG_WHILE = (1 << RES_WHILE),
+ FLAG_UNTIL = (1 << RES_UNTIL),
+ FLAG_DO = (1 << RES_DO ),
+ FLAG_DONE = (1 << RES_DONE ),
+ FLAG_IN = (1 << RES_IN ),
+#endif
+ FLAG_START = (1 << RES_XXXX ),
+};
+
+/* This holds pointers to the various results of parsing */
+struct p_context {
+ struct child_prog *child;
+ struct pipe *list_head;
+ struct pipe *pipe;
+ struct redir_struct *pending_redirect;
+ smallint res_w;
+ smallint parse_type; /* bitmask of PARSEFLAG_xxx, defines type of parser : ";$" common or special symbol */
+ int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */
+ struct p_context *stack;
+ /* How about quoting status? */
+};
+
+struct redir_struct {
+ struct redir_struct *next; /* pointer to the next redirect in the list */
+ redir_type type; /* type of redirection */
+ int fd; /* file descriptor being redirected */
+ int dup; /* -1, or file descriptor being duplicated */
+ char **glob_word; /* *word.gl_pathv is the filename */
+};
+
+struct child_prog {
+ pid_t pid; /* 0 if exited */
+ char **argv; /* program name and arguments */
+ struct pipe *group; /* if non-NULL, first in group or subshell */
+ smallint subshell; /* flag, non-zero if group must be forked */
+ smallint is_stopped; /* is the program currently running? */
+ struct redir_struct *redirects; /* I/O redirections */
+ struct pipe *family; /* pointer back to the child's parent pipe */
+ //sp counting seems to be broken... so commented out, grep for '//sp:'
+ //sp: int sp; /* number of SPECIAL_VAR_SYMBOL */
+ //seems to be unused, grep for '//pt:'
+ //pt: int parse_type;
+};
+/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
+ * and on execution these are substituted with their values.
+ * Substitution can make _several_ words out of one argv[n]!
+ * Example: argv[0]=='.^C*^C.' here: echo .$*.
+ */
+
+struct pipe {
+ struct pipe *next;
+ int num_progs; /* total number of programs in job */
+ int running_progs; /* number of programs running (not exited) */
+ int stopped_progs; /* number of programs alive, but stopped */
+#if ENABLE_HUSH_JOB
+ int jobid; /* job number */
+ pid_t pgrp; /* process group ID for the job */
+ char *cmdtext; /* name of job */
+#endif
+ char *cmdbuf; /* buffer various argv's point into */
+ struct child_prog *progs; /* array of commands in pipe */
+ int job_context; /* bitmask defining current context */
+ smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
+ smallint res_word; /* needed for if, for, while, until... */
+};
+
+/* On program start, environ points to initial environment.
+ * putenv adds new pointers into it, unsetenv removes them.
+ * Neither of these (de)allocates the strings.
+ * setenv allocates new strings in malloc space and does putenv,
+ * and thus setenv is unusable (leaky) for shell's purposes */
+#define setenv(...) setenv_is_leaky_dont_use()
+struct variable {
+ struct variable *next;
+ char *varstr; /* points to "name=" portion */
+ int max_len; /* if > 0, name is part of initial env; else name is malloced */
+ smallint flg_export; /* putenv should be done on this var */
+ smallint flg_read_only;
+};
+
+typedef struct {
+ char *data;
+ int length;
+ int maxlen;
+ smallint o_quote;
+ smallint nonnull;
+} o_string;
+#define NULL_O_STRING {NULL,0,0,0,0}
+/* used for initialization: o_string foo = NULL_O_STRING; */
+
+/* I can almost use ordinary FILE *. Is open_memstream() universally
+ * available? Where is it documented? */
+struct in_str {
+ const char *p;
+ /* eof_flag=1: last char in ->p is really an EOF */
+ char eof_flag; /* meaningless if ->p == NULL */
+ char peek_buf[2];
+#if ENABLE_HUSH_INTERACTIVE
+ smallint promptme;
+ smallint promptmode; /* 0: PS1, 1: PS2 */
+#endif
+ FILE *file;
+ int (*get) (struct in_str *);
+ int (*peek) (struct in_str *);
+};
+#define b_getch(input) ((input)->get(input))
+#define b_peek(input) ((input)->peek(input))
+
+enum {
+ CHAR_ORDINARY = 0,
+ CHAR_ORDINARY_IF_QUOTED = 1, /* example: *, # */
+ CHAR_IFS = 2, /* treated as ordinary if quoted */
+ CHAR_SPECIAL = 3, /* example: $ */
+};
+
+#define HUSH_VER_STR "0.02"
+
+/* "Globals" within this file */
+
+/* Sorted roughly by size (smaller offsets == smaller code) */
+struct globals {
+#if ENABLE_HUSH_INTERACTIVE
+ /* 'interactive_fd' is a fd# open to ctty, if we have one
+ * _AND_ if we decided to act interactively */
+ int interactive_fd;
+ const char *PS1;
+ const char *PS2;
+#endif
+#if ENABLE_FEATURE_EDITING
+ line_input_t *line_input_state;
+#endif
+#if ENABLE_HUSH_JOB
+ int run_list_level;
+ pid_t saved_task_pgrp;
+ pid_t saved_tty_pgrp;
+ int last_jobid;
+ struct pipe *job_list;
+ struct pipe *toplevel_list;
+ smallint ctrl_z_flag;
+#endif
+ smallint fake_mode;
+ /* these three support $?, $#, and $1 */
+ char **global_argv;
+ int global_argc;
+ int last_return_code;
+ const char *ifs;
+ const char *cwd;
+ unsigned last_bg_pid;
+ struct variable *top_var; /* = &shell_ver (set in main()) */
+ struct variable shell_ver;
+#if ENABLE_FEATURE_SH_STANDALONE
+ struct nofork_save_area nofork_save;
+#endif
+#if ENABLE_HUSH_JOB
+ sigjmp_buf toplevel_jb;
+#endif
+ unsigned char charmap[256];
+ char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
+};
+
+#define G (*ptr_to_globals)
+
+#if !ENABLE_HUSH_INTERACTIVE
+enum { interactive_fd = 0 };
+#endif
+#if !ENABLE_HUSH_JOB
+enum { run_list_level = 0 };
+#endif
+
+#if ENABLE_HUSH_INTERACTIVE
+#define interactive_fd (G.interactive_fd )
+#define PS1 (G.PS1 )
+#define PS2 (G.PS2 )
+#endif
+#if ENABLE_FEATURE_EDITING
+#define line_input_state (G.line_input_state)
+#endif
+#if ENABLE_HUSH_JOB
+#define run_list_level (G.run_list_level )
+#define saved_task_pgrp (G.saved_task_pgrp )
+#define saved_tty_pgrp (G.saved_tty_pgrp )
+#define last_jobid (G.last_jobid )
+#define job_list (G.job_list )
+#define toplevel_list (G.toplevel_list )
+#define toplevel_jb (G.toplevel_jb )
+#define ctrl_z_flag (G.ctrl_z_flag )
+#endif /* JOB */
+#define global_argv (G.global_argv )
+#define global_argc (G.global_argc )
+#define last_return_code (G.last_return_code)
+#define ifs (G.ifs )
+#define fake_mode (G.fake_mode )
+#define cwd (G.cwd )
+#define last_bg_pid (G.last_bg_pid )
+#define top_var (G.top_var )
+#define shell_ver (G.shell_ver )
+#if ENABLE_FEATURE_SH_STANDALONE
+#define nofork_save (G.nofork_save )
+#endif
+#if ENABLE_HUSH_JOB
+#define toplevel_jb (G.toplevel_jb )
+#endif
+#define charmap (G.charmap )
+#define user_input_buf (G.user_input_buf )
+#define INIT_G() do { \
+ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+} while (0)
+
+
+#define B_CHUNK 100
+#define B_NOSPAC 1
+#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
+
+#if 1
+/* Normal */
+static void syntax(const char *msg)
+{
+ /* Was using fancy stuff:
+ * (interactive_fd ? bb_error_msg : bb_error_msg_and_die)(...params...)
+ * but it SEGVs. ?! Oh well... explicit temp ptr works around that */
+ void (*fp)(const char *s, ...);
+
+ fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
+ fp(msg ? "%s: %s" : "syntax error", "syntax error", msg);
+}
+
+#else
+/* Debug */
+static void syntax_lineno(int line)
+{
+ void (*fp)(const char *s, ...);
+
+ fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
+ fp("syntax error hush.c:%d", line);
+}
+#define syntax(str) syntax_lineno(__LINE__)
+#endif
+
+/* Index of subroutines: */
+/* o_string manipulation: */
+static int b_check_space(o_string *o, int len);
+static int b_addchr(o_string *o, int ch);
+static void b_reset(o_string *o);
+static int b_addqchr(o_string *o, int ch, int quote);
+/* in_str manipulations: */
+static int static_get(struct in_str *i);
+static int static_peek(struct in_str *i);
+static int file_get(struct in_str *i);
+static int file_peek(struct in_str *i);
+static void setup_file_in_str(struct in_str *i, FILE *f);
+static void setup_string_in_str(struct in_str *i, const char *s);
+/* "run" the final data structures: */
+#if !defined(DEBUG_CLEAN)
+#define free_pipe_list(head, indent) free_pipe_list(head)
+#define free_pipe(pi, indent) free_pipe(pi)
+#endif
+static int free_pipe_list(struct pipe *head, int indent);
+static int free_pipe(struct pipe *pi, int indent);
+/* really run the final data structures: */
+static int setup_redirects(struct child_prog *prog, int squirrel[]);
+static int run_list(struct pipe *pi);
+static void pseudo_exec_argv(char **argv) ATTRIBUTE_NORETURN;
+static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
+static int run_pipe(struct pipe *pi);
+/* extended glob support: */
+static char **globhack(const char *src, char **strings);
+static int glob_needed(const char *s);
+static int xglob(o_string *dest, char ***pglob);
+/* variable assignment: */
+static int is_assignment(const char *s);
+/* data structure manipulation: */
+static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
+static void initialize_context(struct p_context *ctx);
+static int done_word(o_string *dest, struct p_context *ctx);
+static int done_command(struct p_context *ctx);
+static int done_pipe(struct p_context *ctx, pipe_style type);
+/* primary string parsing: */
+static int redirect_dup_num(struct in_str *input);
+static int redirect_opt_num(o_string *o);
+#if ENABLE_HUSH_TICK
+static int process_command_subs(o_string *dest, /*struct p_context *ctx,*/
+ struct in_str *input, const char *subst_end);
+#endif
+static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
+static const char *lookup_param(const char *src);
+static int handle_dollar(o_string *dest, /*struct p_context *ctx,*/
+ struct in_str *input);
+static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, const char *end_trigger);
+/* setup: */
+static int parse_and_run_stream(struct in_str *inp, int parse_flag);
+static int parse_and_run_string(const char *s, int parse_flag);
+static int parse_and_run_file(FILE *f);
+/* job management: */
+static int checkjobs(struct pipe* fg_pipe);
+#if ENABLE_HUSH_JOB
+static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
+static void insert_bg_job(struct pipe *pi);
+static void remove_bg_job(struct pipe *pi);
+static void delete_finished_bg_job(struct pipe *pi);
+#else
+int checkjobs_and_fg_shell(struct pipe* fg_pipe); /* never called */
+#endif
+/* local variable support */
+static char **expand_strvec_to_strvec(char **argv);
+/* used for eval */
+static char *expand_strvec_to_string(char **argv);
+/* used for expansion of right hand of assignments */
+static char *expand_string_to_string(const char *str);
+static struct variable *get_local_var(const char *name);
+static int set_local_var(char *str, int flg_export);
+static void unset_local_var(const char *name);
+
+
+static char **add_strings_to_strings(int need_xstrdup, char **strings, char **add)
+{
+ int i;
+ unsigned count1;
+ unsigned count2;
+ char **v;
+
+ v = strings;
+ count1 = 0;
+ if (v) {
+ while (*v) {
+ count1++;
+ v++;
+ }
+ }
+ count2 = 0;
+ v = add;
+ while (*v) {
+ count2++;
+ v++;
+ }
+ v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
+ v[count1 + count2] = NULL;
+ i = count2;
+ while (--i >= 0)
+ v[count1 + i] = need_xstrdup ? xstrdup(add[i]) : add[i];
+ return v;
+}
+
+/* 'add' should be a malloced pointer */
+static char **add_string_to_strings(char **strings, char *add)
+{
+ char *v[2];
+
+ v[0] = add;
+ v[1] = NULL;
+
+ return add_strings_to_strings(0, strings, v);
+}
+
+static void free_strings(char **strings)
+{
+ if (strings) {
+ char **v = strings;
+ while (*v)
+ free(*v++);
+ free(strings);
+ }
+}
+
+
+/* Function prototypes for builtins */
+static int builtin_cd(char **argv);
+static int builtin_echo(char **argv);
+static int builtin_eval(char **argv);
+static int builtin_exec(char **argv);
+static int builtin_exit(char **argv);
+static int builtin_export(char **argv);
+#if ENABLE_HUSH_JOB
+static int builtin_fg_bg(char **argv);
+static int builtin_jobs(char **argv);
+#endif
+#if ENABLE_HUSH_HELP
+static int builtin_help(char **argv);
+#endif
+static int builtin_pwd(char **argv);
+static int builtin_read(char **argv);
+static int builtin_test(char **argv);
+static int builtin_set(char **argv);
+static int builtin_shift(char **argv);
+static int builtin_source(char **argv);
+static int builtin_umask(char **argv);
+static int builtin_unset(char **argv);
+//static int builtin_not_written(char **argv);
+
+/* Table of built-in functions. They can be forked or not, depending on
+ * context: within pipes, they fork. As simple commands, they do not.
+ * When used in non-forking context, they can change global variables
+ * in the parent shell process. If forked, of course they cannot.
+ * For example, 'unset foo | whatever' will parse and run, but foo will
+ * still be set at the end. */
+struct built_in_command {
+ const char *cmd; /* name */
+ int (*function) (char **argv); /* function ptr */
+#if ENABLE_HUSH_HELP
+ const char *descr; /* description */
+#define BLTIN(cmd, func, help) { cmd, func, help }
+#else
+#define BLTIN(cmd, func, help) { cmd, func }
+#endif
+};
+
+/* For now, echo and test are unconditionally enabled.
+ * Maybe make it configurable? */
+static const struct built_in_command bltins[] = {
+ BLTIN("[" , builtin_test, "Test condition"),
+ BLTIN("[[" , builtin_test, "Test condition"),
+#if ENABLE_HUSH_JOB
+ BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
+#endif
+// BLTIN("break" , builtin_not_written, "Exit for, while or until loop"),
+ BLTIN("cd" , builtin_cd, "Change working directory"),
+// BLTIN("continue", builtin_not_written, "Continue for, while or until loop"),
+ BLTIN("echo" , builtin_echo, "Write strings to stdout"),
+ BLTIN("eval" , builtin_eval, "Construct and run shell command"),
+ BLTIN("exec" , builtin_exec, "Exec command, replacing this shell with the exec'd process"),
+ BLTIN("exit" , builtin_exit, "Exit from shell"),
+ BLTIN("export", builtin_export, "Set environment variable"),
+#if ENABLE_HUSH_JOB
+ BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
+ BLTIN("jobs" , builtin_jobs, "Lists the active jobs"),
+#endif
+// TODO: remove pwd? we have it as an applet...
+ BLTIN("pwd" , builtin_pwd, "Print current directory"),
+ BLTIN("read" , builtin_read, "Input environment variable"),
+// BLTIN("return", builtin_not_written, "Return from a function"),
+ BLTIN("set" , builtin_set, "Set/unset shell local variables"),
+ BLTIN("shift" , builtin_shift, "Shift positional parameters"),
+// BLTIN("trap" , builtin_not_written, "Trap signals"),
+ BLTIN("test" , builtin_test, "Test condition"),
+// BLTIN("ulimit", builtin_not_written, "Controls resource limits"),
+ BLTIN("umask" , builtin_umask, "Sets file creation mask"),
+ BLTIN("unset" , builtin_unset, "Unset environment variable"),
+ BLTIN("." , builtin_source, "Source-in and run commands in a file"),
+#if ENABLE_HUSH_HELP
+ BLTIN("help" , builtin_help, "List shell built-in commands"),
+#endif
+ BLTIN(NULL, NULL, NULL)
+};
+
+#if ENABLE_HUSH_JOB
+
+/* Signals are grouped, we handle them in batches */
+static void set_fatal_sighandler(void (*handler)(int))
+{
+ bb_signals(0
+ + (1 << SIGILL)
+ + (1 << SIGTRAP)
+ + (1 << SIGABRT)
+ + (1 << SIGFPE)
+ + (1 << SIGBUS)
+ + (1 << SIGSEGV)
+ /* bash 3.2 seems to handle these just like 'fatal' ones */
+ + (1 << SIGHUP)
+ + (1 << SIGPIPE)
+ + (1 << SIGALRM)
+ , handler);
+}
+static void set_jobctrl_sighandler(void (*handler)(int))
+{
+ bb_signals(0
+ + (1 << SIGTSTP)
+ + (1 << SIGTTIN)
+ + (1 << SIGTTOU)
+ , handler);
+}
+static void set_misc_sighandler(void (*handler)(int))
+{
+ bb_signals(0
+ + (1 << SIGINT)
+ + (1 << SIGQUIT)
+ + (1 << SIGTERM)
+ , handler);
+}
+/* SIGCHLD is special and handled separately */
+
+static void set_every_sighandler(void (*handler)(int))
+{
+ set_fatal_sighandler(handler);
+ set_jobctrl_sighandler(handler);
+ set_misc_sighandler(handler);
+ signal(SIGCHLD, handler);
+}
+
+static void handler_ctrl_c(int sig ATTRIBUTE_UNUSED)
+{
+ debug_printf_jobs("got sig %d\n", sig);
+// as usual we can have all kinds of nasty problems with leaked malloc data here
+ siglongjmp(toplevel_jb, 1);
+}
+
+static void handler_ctrl_z(int sig ATTRIBUTE_UNUSED)
+{
+ pid_t pid;
+
+ debug_printf_jobs("got tty sig %d in pid %d\n", sig, getpid());
+ pid = fork();
+ if (pid < 0) /* can't fork. Pretend there was no ctrl-Z */
+ return;
+ ctrl_z_flag = 1;
+ if (!pid) { /* child */
+ if (ENABLE_HUSH_JOB)
+ die_sleep = 0; /* let nofork's xfuncs die */
+ setpgrp();
+ debug_printf_jobs("set pgrp for child %d ok\n", getpid());
+ set_every_sighandler(SIG_DFL);
+ raise(SIGTSTP); /* resend TSTP so that child will be stopped */
+ debug_printf_jobs("returning in child\n");
+ /* return to nofork, it will eventually exit now,
+ * not return back to shell */
+ return;
+ }
+ /* parent */
+ /* finish filling up pipe info */
+ toplevel_list->pgrp = pid; /* child is in its own pgrp */
+ toplevel_list->progs[0].pid = pid;
+ /* parent needs to longjmp out of running nofork.
+ * we will "return" exitcode 0, with child put in background */
+// as usual we can have all kinds of nasty problems with leaked malloc data here
+ debug_printf_jobs("siglongjmp in parent\n");
+ siglongjmp(toplevel_jb, 1);
+}
+
+/* Restores tty foreground process group, and exits.
+ * May be called as signal handler for fatal signal
+ * (will faithfully resend signal to itself, producing correct exit state)
+ * or called directly with -EXITCODE.
+ * We also call it if xfunc is exiting. */
+static void sigexit(int sig) ATTRIBUTE_NORETURN;
+static void sigexit(int sig)
+{
+ /* Disable all signals: job control, SIGPIPE, etc. */
+ sigprocmask_allsigs(SIG_BLOCK);
+
+ if (interactive_fd)
+ tcsetpgrp(interactive_fd, saved_tty_pgrp);
+
+ /* Not a signal, just exit */
+ if (sig <= 0)
+ _exit(- sig);
+
+ kill_myself_with_sig(sig); /* does not return */
+}
+
+/* Restores tty foreground process group, and exits. */
+static void hush_exit(int exitcode) ATTRIBUTE_NORETURN;
+static void hush_exit(int exitcode)
+{
+ fflush(NULL); /* flush all streams */
+ sigexit(- (exitcode & 0xff));
+}
+
+#else /* !JOB */
+
+#define set_fatal_sighandler(handler) ((void)0)
+#define set_jobctrl_sighandler(handler) ((void)0)
+#define set_misc_sighandler(handler) ((void)0)
+#define hush_exit(e) exit(e)
+
+#endif /* JOB */
+
+
+static const char *set_cwd(void)
+{
+ if (cwd == bb_msg_unknown)
+ cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
+ cwd = xrealloc_getcwd_or_warn((char *)cwd);
+ if (!cwd)
+ cwd = bb_msg_unknown;
+ return cwd;
+}
+
+
+/* built-in 'test' handler */
+static int builtin_test(char **argv)
+{
+ int argc = 0;
+ while (*argv) {
+ argc++;
+ argv++;
+ }
+ return test_main(argc, argv - argc);
+}
+
+/* built-in 'test' handler */
+static int builtin_echo(char **argv)
+{
+ int argc = 0;
+ while (*argv) {
+ argc++;
+ argv++;
+ }
+ return echo_main(argc, argv - argc);
+}
+
+/* built-in 'eval' handler */
+static int builtin_eval(char **argv)
+{
+ int rcode = EXIT_SUCCESS;
+
+ if (argv[1]) {
+ char *str = expand_strvec_to_string(argv + 1);
+ parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP |
+ PARSEFLAG_SEMICOLON);
+ free(str);
+ rcode = last_return_code;
+ }
+ return rcode;
+}
+
+/* built-in 'cd <path>' handler */
+static int builtin_cd(char **argv)
+{
+ const char *newdir;
+ if (argv[1] == NULL) {
+ // bash does nothing (exitcode 0) if HOME is ""; if it's unset,
+ // bash says "bash: cd: HOME not set" and does nothing (exitcode 1)
+ newdir = getenv("HOME") ? : "/";
+ } else
+ newdir = argv[1];
+ if (chdir(newdir)) {
+ printf("cd: %s: %s\n", newdir, strerror(errno));
+ return EXIT_FAILURE;
+ }
+ set_cwd();
+ return EXIT_SUCCESS;
+}
+
+/* built-in 'exec' handler */
+static int builtin_exec(char **argv)
+{
+ if (argv[1] == NULL)
+ return EXIT_SUCCESS; /* bash does this */
+// FIXME: if exec fails, bash does NOT exit! We do...
+ pseudo_exec_argv(argv + 1);
+ /* never returns */
+}
+
+/* built-in 'exit' handler */
+static int builtin_exit(char **argv)
+{
+// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
+ //puts("exit"); /* bash does it */
+// TODO: warn if we have background jobs: "There are stopped jobs"
+// On second consecutive 'exit', exit anyway.
+
+ if (argv[1] == NULL)
+ hush_exit(last_return_code);
+ /* mimic bash: exit 123abc == exit 255 + error msg */
+ xfunc_error_retval = 255;
+ /* bash: exit -2 == exit 254, no error msg */
+ hush_exit(xatoi(argv[1]) & 0xff);
+}
+
+/* built-in 'export VAR=value' handler */
+static int builtin_export(char **argv)
+{
+ const char *value;
+ char *name = argv[1];
+
+ if (name == NULL) {
+ // TODO:
+ // ash emits: export VAR='VAL'
+ // bash: declare -x VAR="VAL"
+ // (both also escape as needed (quotes, $, etc))
+ char **e = environ;
+ if (e)
+ while (*e)
+ puts(*e++);
+ return EXIT_SUCCESS;
+ }
+
+ value = strchr(name, '=');
+ if (!value) {
+ /* They are exporting something without a =VALUE */
+ struct variable *var;
+
+ var = get_local_var(name);
+ if (var) {
+ var->flg_export = 1;
+ putenv(var->varstr);
+ }
+ /* bash does not return an error when trying to export
+ * an undefined variable. Do likewise. */
+ return EXIT_SUCCESS;
+ }
+
+ set_local_var(xstrdup(name), 1);
+ return EXIT_SUCCESS;
+}
+
+#if ENABLE_HUSH_JOB
+/* built-in 'fg' and 'bg' handler */
+static int builtin_fg_bg(char **argv)
+{
+ int i, jobnum;
+ struct pipe *pi;
+
+ if (!interactive_fd)
+ return EXIT_FAILURE;
+ /* If they gave us no args, assume they want the last backgrounded task */
+ if (!argv[1]) {
+ for (pi = job_list; pi; pi = pi->next) {
+ if (pi->jobid == last_jobid) {
+ goto found;
+ }
+ }
+ bb_error_msg("%s: no current job", argv[0]);
+ return EXIT_FAILURE;
+ }
+ if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
+ bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
+ return EXIT_FAILURE;
+ }
+ for (pi = job_list; pi; pi = pi->next) {
+ if (pi->jobid == jobnum) {
+ goto found;
+ }
+ }
+ bb_error_msg("%s: %d: no such job", argv[0], jobnum);
+ return EXIT_FAILURE;
+ found:
+ // TODO: bash prints a string representation
+ // of job being foregrounded (like "sleep 1 | cat")
+ if (*argv[0] == 'f') {
+ /* Put the job into the foreground. */
+ tcsetpgrp(interactive_fd, pi->pgrp);
+ }
+
+ /* Restart the processes in the job */
+ debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
+ for (i = 0; i < pi->num_progs; i++) {
+ debug_printf_jobs("reviving pid %d\n", pi->progs[i].pid);
+ pi->progs[i].is_stopped = 0;
+ }
+ pi->stopped_progs = 0;
+
+ i = kill(- pi->pgrp, SIGCONT);
+ if (i < 0) {
+ if (errno == ESRCH) {
+ delete_finished_bg_job(pi);
+ return EXIT_SUCCESS;
+ } else {
+ bb_perror_msg("kill (SIGCONT)");
+ }
+ }
+
+ if (*argv[0] == 'f') {
+ remove_bg_job(pi);
+ return checkjobs_and_fg_shell(pi);
+ }
+ return EXIT_SUCCESS;
+}
+#endif
+
+/* built-in 'help' handler */
+#if ENABLE_HUSH_HELP
+static int builtin_help(char **argv ATTRIBUTE_UNUSED)
+{
+ const struct built_in_command *x;
+
+ printf("\nBuilt-in commands:\n");
+ printf("-------------------\n");
+ for (x = bltins; x->cmd; x++) {
+ printf("%s\t%s\n", x->cmd, x->descr);
+ }
+ printf("\n\n");
+ return EXIT_SUCCESS;
+}
+#endif
+
+#if ENABLE_HUSH_JOB
+/* built-in 'jobs' handler */
+static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
+{
+ struct pipe *job;
+ const char *status_string;
+
+ for (job = job_list; job; job = job->next) {
+ if (job->running_progs == job->stopped_progs)
+ status_string = "Stopped";
+ else
+ status_string = "Running";
+
+ printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
+ }
+ return EXIT_SUCCESS;
+}
+#endif
+
+/* built-in 'pwd' handler */
+static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
+{
+ puts(set_cwd());
+ return EXIT_SUCCESS;
+}
+
+/* built-in 'read VAR' handler */
+static int builtin_read(char **argv)
+{
+ char *string;
+ const char *name = argv[1] ? argv[1] : "REPLY";
+
+ string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name));
+ return set_local_var(string, 0);
+}
+
+/* built-in 'set [VAR=value]' handler */
+static int builtin_set(char **argv)
+{
+ char *temp = argv[1];
+ struct variable *e;
+
+ if (temp == NULL)
+ for (e = top_var; e; e = e->next)
+ puts(e->varstr);
+ else
+ set_local_var(xstrdup(temp), 0);
+
+ return EXIT_SUCCESS;
+}
+
+
+/* Built-in 'shift' handler */
+static int builtin_shift(char **argv)
+{
+ int n = 1;
+ if (argv[1]) {
+ n = atoi(argv[1]);
+ }
+ if (n >= 0 && n < global_argc) {
+ global_argv[n] = global_argv[0];
+ global_argc -= n;
+ global_argv += n;
+ return EXIT_SUCCESS;
+ }
+ return EXIT_FAILURE;
+}
+
+/* Built-in '.' handler (read-in and execute commands from file) */
+static int builtin_source(char **argv)
+{
+ FILE *input;
+ int status;
+
+ if (argv[1] == NULL)
+ return EXIT_FAILURE;
+
+ /* XXX search through $PATH is missing */
+ input = fopen(argv[1], "r");
+ if (!input) {
+ bb_error_msg("cannot open '%s'", argv[1]);
+ return EXIT_FAILURE;
+ }
+ close_on_exec_on(fileno(input));
+
+ /* Now run the file */
+ /* XXX argv and argc are broken; need to save old global_argv
+ * (pointer only is OK!) on this stack frame,
+ * set global_argv=argv+1, recurse, and restore. */
+ status = parse_and_run_file(input);
+ fclose(input);
+ return status;
+}
+
+static int builtin_umask(char **argv)
+{
+ mode_t new_umask;
+ const char *arg = argv[1];
+ char *end;
+ if (arg) {
+ new_umask = strtoul(arg, &end, 8);
+ if (*end != '\0' || end == arg) {
+ return EXIT_FAILURE;
+ }
+ } else {
+ new_umask = umask(0);
+ printf("%.3o\n", (unsigned) new_umask);
+ }
+ umask(new_umask);
+ return EXIT_SUCCESS;
+}
+
+/* built-in 'unset VAR' handler */
+static int builtin_unset(char **argv)
+{
+ /* bash always returns true */
+ unset_local_var(argv[1]);
+ return EXIT_SUCCESS;
+}
+
+//static int builtin_not_written(char **argv)
+//{
+// printf("builtin_%s not written\n", argv[0]);
+// return EXIT_FAILURE;
+//}
+
+static int b_check_space(o_string *o, int len)
+{
+ /* It would be easy to drop a more restrictive policy
+ * in here, such as setting a maximum string length */
+ if (o->length + len > o->maxlen) {
+ /* assert(data == NULL || o->maxlen != 0); */
+ o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
+ o->data = xrealloc(o->data, 1 + o->maxlen);
+ }
+ return o->data == NULL;
+}
+
+static int b_addchr(o_string *o, int ch)
+{
+ debug_printf("b_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
+ if (b_check_space(o, 1))
+ return B_NOSPAC;
+ o->data[o->length] = ch;
+ o->length++;
+ o->data[o->length] = '\0';
+ return 0;
+}
+
+static void b_reset(o_string *o)
+{
+ o->length = 0;
+ o->nonnull = 0;
+ if (o->data)
+ o->data[0] = '\0';
+}
+
+static void b_free(o_string *o)
+{
+ free(o->data);
+ memset(o, 0, sizeof(*o));
+}
+
+/* My analysis of quoting semantics tells me that state information
+ * is associated with a destination, not a source.
+ */
+static int b_addqchr(o_string *o, int ch, int quote)
+{
+ if (quote && strchr("*?[\\", ch)) {
+ int rc;
+ rc = b_addchr(o, '\\');
+ if (rc)
+ return rc;
+ }
+ return b_addchr(o, ch);
+}
+
+static int static_get(struct in_str *i)
+{
+ int ch = *i->p++;
+ if (ch == '\0') return EOF;
+ return ch;
+}
+
+static int static_peek(struct in_str *i)
+{
+ return *i->p;
+}
+
+#if ENABLE_HUSH_INTERACTIVE
+#if ENABLE_FEATURE_EDITING
+static void cmdedit_set_initial_prompt(void)
+{
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ PS1 = NULL;
+#else
+ PS1 = getenv("PS1");
+ if (PS1 == NULL)
+ PS1 = "\\w \\$ ";
+#endif
+}
+#endif /* EDITING */
+
+static const char* setup_prompt_string(int promptmode)
+{
+ const char *prompt_str;
+ debug_printf("setup_prompt_string %d ", promptmode);
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ /* Set up the prompt */
+ if (promptmode == 0) { /* PS1 */
+ free((char*)PS1);
+ PS1 = xasprintf("%s %c ", cwd, (geteuid() != 0) ? '$' : '#');
+ prompt_str = PS1;
+ } else {
+ prompt_str = PS2;
+ }
+#else
+ prompt_str = (promptmode == 0) ? PS1 : PS2;
+#endif
+ debug_printf("result '%s'\n", prompt_str);
+ return prompt_str;
+}
+
+static void get_user_input(struct in_str *i)
+{
+ int r;
+ const char *prompt_str;
+
+ prompt_str = setup_prompt_string(i->promptmode);
+#if ENABLE_FEATURE_EDITING
+ /* Enable command line editing only while a command line
+ * is actually being read */
+ do {
+ r = read_line_input(prompt_str, user_input_buf, BUFSIZ-1, line_input_state);
+ } while (r == 0); /* repeat if Ctrl-C */
+ i->eof_flag = (r < 0);
+ if (i->eof_flag) { /* EOF/error detected */
+ user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
+ user_input_buf[1] = '\0';
+ }
+#else
+ fputs(prompt_str, stdout);
+ fflush(stdout);
+ user_input_buf[0] = r = fgetc(i->file);
+ /*user_input_buf[1] = '\0'; - already is and never changed */
+ i->eof_flag = (r == EOF);
+#endif
+ i->p = user_input_buf;
+}
+#endif /* INTERACTIVE */
+
+/* This is the magic location that prints prompts
+ * and gets data back from the user */
+static int file_get(struct in_str *i)
+{
+ int ch;
+
+ /* If there is data waiting, eat it up */
+ if (i->p && *i->p) {
+#if ENABLE_HUSH_INTERACTIVE
+ take_cached:
+#endif
+ ch = *i->p++;
+ if (i->eof_flag && !*i->p)
+ ch = EOF;
+ } else {
+ /* need to double check i->file because we might be doing something
+ * more complicated by now, like sourcing or substituting. */
+#if ENABLE_HUSH_INTERACTIVE
+ if (interactive_fd && i->promptme && i->file == stdin) {
+ do {
+ get_user_input(i);
+ } while (!*i->p); /* need non-empty line */
+ i->promptmode = 1; /* PS2 */
+ i->promptme = 0;
+ goto take_cached;
+ }
+#endif
+ ch = fgetc(i->file);
+ }
+ debug_printf("file_get: got a '%c' %d\n", ch, ch);
+#if ENABLE_HUSH_INTERACTIVE
+ if (ch == '\n')
+ i->promptme = 1;
+#endif
+ return ch;
+}
+
+/* All the callers guarantee this routine will never be
+ * used right after a newline, so prompting is not needed.
+ */
+static int file_peek(struct in_str *i)
+{
+ int ch;
+ if (i->p && *i->p) {
+ if (i->eof_flag && !i->p[1])
+ return EOF;
+ return *i->p;
+ }
+ ch = fgetc(i->file);
+ i->eof_flag = (ch == EOF);
+ i->peek_buf[0] = ch;
+ i->peek_buf[1] = '\0';
+ i->p = i->peek_buf;
+ debug_printf("file_peek: got a '%c' %d\n", *i->p, *i->p);
+ return ch;
+}
+
+static void setup_file_in_str(struct in_str *i, FILE *f)
+{
+ i->peek = file_peek;
+ i->get = file_get;
+#if ENABLE_HUSH_INTERACTIVE
+ i->promptme = 1;
+ i->promptmode = 0; /* PS1 */
+#endif
+ i->file = f;
+ i->p = NULL;
+}
+
+static void setup_string_in_str(struct in_str *i, const char *s)
+{
+ i->peek = static_peek;
+ i->get = static_get;
+#if ENABLE_HUSH_INTERACTIVE
+ i->promptme = 1;
+ i->promptmode = 0; /* PS1 */
+#endif
+ i->p = s;
+ i->eof_flag = 0;
+}
+
+/* squirrel != NULL means we squirrel away copies of stdin, stdout,
+ * and stderr if they are redirected. */
+static int setup_redirects(struct child_prog *prog, int squirrel[])
+{
+ int openfd, mode;
+ struct redir_struct *redir;
+
+ for (redir = prog->redirects; redir; redir = redir->next) {
+ if (redir->dup == -1 && redir->glob_word == NULL) {
+ /* something went wrong in the parse. Pretend it didn't happen */
+ continue;
+ }
+ if (redir->dup == -1) {
+ char *p;
+ mode = redir_table[redir->type].mode;
+ p = expand_string_to_string(redir->glob_word[0]);
+ openfd = open_or_warn(p, mode);
+ free(p);
+ if (openfd < 0) {
+ /* this could get lost if stderr has been redirected, but
+ bash and ash both lose it as well (though zsh doesn't!) */
+ return 1;
+ }
+ } else {
+ openfd = redir->dup;
+ }
+
+ if (openfd != redir->fd) {
+ if (squirrel && redir->fd < 3) {
+ squirrel[redir->fd] = dup(redir->fd);
+ }
+ if (openfd == -3) {
+ //close(openfd); // close(-3) ??!
+ } else {
+ dup2(openfd, redir->fd);
+ if (redir->dup == -1)
+ close(openfd);
+ }
+ }
+ }
+ return 0;
+}
+
+static void restore_redirects(int squirrel[])
+{
+ int i, fd;
+ for (i = 0; i < 3; i++) {
+ fd = squirrel[i];
+ if (fd != -1) {
+ /* We simply die on error */
+ xmove_fd(fd, i);
+ }
+ }
+}
+
+/* Called after [v]fork() in run_pipe(), or from builtin_exec().
+ * Never returns.
+ * XXX no exit() here. If you don't exec, use _exit instead.
+ * The at_exit handlers apparently confuse the calling process,
+ * in particular stdin handling. Not sure why? -- because of vfork! (vda) */
+static void pseudo_exec_argv(char **argv)
+{
+ int i, rcode;
+ char *p;
+ const struct built_in_command *x;
+
+ for (i = 0; is_assignment(argv[i]); i++) {
+ debug_printf_exec("pid %d environment modification: %s\n",
+ getpid(), argv[i]);
+// FIXME: vfork case??
+ p = expand_string_to_string(argv[i]);
+ putenv(p);
+ }
+ argv += i;
+ /* If a variable is assigned in a forest, and nobody listens,
+ * was it ever really set?
+ */
+ if (!argv[0])
+ _exit(EXIT_SUCCESS);
+
+ argv = expand_strvec_to_strvec(argv);
+
+ /*
+ * Check if the command matches any of the builtins.
+ * Depending on context, this might be redundant. But it's
+ * easier to waste a few CPU cycles than it is to figure out
+ * if this is one of those cases.
+ */
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(argv[0], x->cmd) == 0) {
+ debug_printf_exec("running builtin '%s'\n", argv[0]);
+ rcode = x->function(argv);
+ fflush(stdout);
+ _exit(rcode);
+ }
+ }
+
+ /* Check if the command matches any busybox applets */
+#if ENABLE_FEATURE_SH_STANDALONE
+ if (strchr(argv[0], '/') == NULL) {
+ int a = find_applet_by_name(argv[0]);
+ if (a >= 0) {
+ if (APPLET_IS_NOEXEC(a)) {
+ debug_printf_exec("running applet '%s'\n", argv[0]);
+// is it ok that run_applet_no_and_exit() does exit(), not _exit()?
+ run_applet_no_and_exit(a, argv);
+ }
+ /* re-exec ourselves with the new arguments */
+ debug_printf_exec("re-execing applet '%s'\n", argv[0]);
+ execvp(bb_busybox_exec_path, argv);
+ /* If they called chroot or otherwise made the binary no longer
+ * executable, fall through */
+ }
+ }
+#endif
+
+ debug_printf_exec("execing '%s'\n", argv[0]);
+ execvp(argv[0], argv);
+ bb_perror_msg("cannot exec '%s'", argv[0]);
+ _exit(1);
+}
+
+/* Called after [v]fork() in run_pipe()
+ */
+static void pseudo_exec(struct child_prog *child)
+{
+// FIXME: buggy wrt NOMMU! Must not modify any global data
+// until it does exec/_exit, but currently it does
+// (puts malloc'ed stuff into environment)
+ if (child->argv)
+ pseudo_exec_argv(child->argv);
+
+ if (child->group) {
+#if !BB_MMU
+ bb_error_msg_and_die("nested lists are not supported on NOMMU");
+#else
+ int rcode;
+
+#if ENABLE_HUSH_INTERACTIVE
+// run_list_level now takes care of it?
+// debug_printf_exec("pseudo_exec: setting interactive_fd=0\n");
+// interactive_fd = 0; /* crucial!!!! */
+#endif
+ debug_printf_exec("pseudo_exec: run_list\n");
+ rcode = run_list(child->group);
+ /* OK to leak memory by not calling free_pipe_list,
+ * since this process is about to exit */
+ _exit(rcode);
+#endif
+ }
+
+ /* Can happen. See what bash does with ">foo" by itself. */
+ debug_printf("trying to pseudo_exec null command\n");
+ _exit(EXIT_SUCCESS);
+}
+
+#if ENABLE_HUSH_JOB
+static const char *get_cmdtext(struct pipe *pi)
+{
+ char **argv;
+ char *p;
+ int len;
+
+ /* This is subtle. ->cmdtext is created only on first backgrounding.
+ * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
+ * On subsequent bg argv is trashed, but we won't use it */
+ if (pi->cmdtext)
+ return pi->cmdtext;
+ argv = pi->progs[0].argv;
+ if (!argv || !argv[0])
+ return (pi->cmdtext = xzalloc(1));
+
+ len = 0;
+ do len += strlen(*argv) + 1; while (*++argv);
+ pi->cmdtext = p = xmalloc(len);
+ argv = pi->progs[0].argv;
+ do {
+ len = strlen(*argv);
+ memcpy(p, *argv, len);
+ p += len;
+ *p++ = ' ';
+ } while (*++argv);
+ p[-1] = '\0';
+ return pi->cmdtext;
+}
+
+static void insert_bg_job(struct pipe *pi)
+{
+ struct pipe *thejob;
+ int i;
+
+ /* Linear search for the ID of the job to use */
+ pi->jobid = 1;
+ for (thejob = job_list; thejob; thejob = thejob->next)
+ if (thejob->jobid >= pi->jobid)
+ pi->jobid = thejob->jobid + 1;
+
+ /* Add thejob to the list of running jobs */
+ if (!job_list) {
+ thejob = job_list = xmalloc(sizeof(*thejob));
+ } else {
+ for (thejob = job_list; thejob->next; thejob = thejob->next)
+ continue;
+ thejob->next = xmalloc(sizeof(*thejob));
+ thejob = thejob->next;
+ }
+
+ /* Physically copy the struct job */
+ memcpy(thejob, pi, sizeof(struct pipe));
+ thejob->progs = xzalloc(sizeof(pi->progs[0]) * pi->num_progs);
+ /* We cannot copy entire pi->progs[] vector! Double free()s will happen */
+ for (i = 0; i < pi->num_progs; i++) {
+// TODO: do we really need to have so many fields which are just dead weight
+// at execution stage?
+ thejob->progs[i].pid = pi->progs[i].pid;
+ /* all other fields are not used and stay zero */
+ }
+ thejob->next = NULL;
+ thejob->cmdtext = xstrdup(get_cmdtext(pi));
+
+ /* We don't wait for background thejobs to return -- append it
+ to the list of backgrounded thejobs and leave it alone */
+ printf("[%d] %d %s\n", thejob->jobid, thejob->progs[0].pid, thejob->cmdtext);
+ last_bg_pid = thejob->progs[0].pid;
+ last_jobid = thejob->jobid;
+}
+
+static void remove_bg_job(struct pipe *pi)
+{
+ struct pipe *prev_pipe;
+
+ if (pi == job_list) {
+ job_list = pi->next;
+ } else {
+ prev_pipe = job_list;
+ while (prev_pipe->next != pi)
+ prev_pipe = prev_pipe->next;
+ prev_pipe->next = pi->next;
+ }
+ if (job_list)
+ last_jobid = job_list->jobid;
+ else
+ last_jobid = 0;
+}
+
+/* remove a backgrounded job */
+static void delete_finished_bg_job(struct pipe *pi)
+{
+ remove_bg_job(pi);
+ pi->stopped_progs = 0;
+ free_pipe(pi, 0);
+ free(pi);
+}
+#endif /* JOB */
+
+/* Checks to see if any processes have exited -- if they
+ have, figure out why and see if a job has completed */
+static int checkjobs(struct pipe* fg_pipe)
+{
+ int attributes;
+ int status;
+#if ENABLE_HUSH_JOB
+ int prognum = 0;
+ struct pipe *pi;
+#endif
+ pid_t childpid;
+ int rcode = 0;
+
+ attributes = WUNTRACED;
+ if (fg_pipe == NULL) {
+ attributes |= WNOHANG;
+ }
+
+/* Do we do this right?
+ * bash-3.00# sleep 20 | false
+ * <ctrl-Z pressed>
+ * [3]+ Stopped sleep 20 | false
+ * bash-3.00# echo $?
+ * 1 <========== bg pipe is not fully done, but exitcode is already known!
+ */
+
+//FIXME: non-interactive bash does not continue even if all processes in fg pipe
+//are stopped. Testcase: "cat | cat" in a script (not on command line)
+// + killall -STOP cat
+
+ wait_more:
+// TODO: safe_waitpid?
+ while ((childpid = waitpid(-1, &status, attributes)) > 0) {
+ const int dead = WIFEXITED(status) || WIFSIGNALED(status);
+
+#ifdef DEBUG_SHELL_JOBS
+ if (WIFSTOPPED(status))
+ debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
+ childpid, WSTOPSIG(status), WEXITSTATUS(status));
+ if (WIFSIGNALED(status))
+ debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
+ childpid, WTERMSIG(status), WEXITSTATUS(status));
+ if (WIFEXITED(status))
+ debug_printf_jobs("pid %d exited, exitcode %d\n",
+ childpid, WEXITSTATUS(status));
+#endif
+ /* Were we asked to wait for fg pipe? */
+ if (fg_pipe) {
+ int i;
+ for (i = 0; i < fg_pipe->num_progs; i++) {
+ debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid);
+ if (fg_pipe->progs[i].pid == childpid) {
+ /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
+ if (dead) {
+ fg_pipe->progs[i].pid = 0;
+ fg_pipe->running_progs--;
+ if (i == fg_pipe->num_progs - 1)
+ /* last process gives overall exitstatus */
+ rcode = WEXITSTATUS(status);
+ } else {
+ fg_pipe->progs[i].is_stopped = 1;
+ fg_pipe->stopped_progs++;
+ }
+ debug_printf_jobs("fg_pipe: running_progs %d stopped_progs %d\n",
+ fg_pipe->running_progs, fg_pipe->stopped_progs);
+ if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
+ /* All processes in fg pipe have exited/stopped */
+#if ENABLE_HUSH_JOB
+ if (fg_pipe->running_progs)
+ insert_bg_job(fg_pipe);
+#endif
+ return rcode;
+ }
+ /* There are still running processes in the fg pipe */
+ goto wait_more;
+ }
+ }
+ /* fall through to searching process in bg pipes */
+ }
+
+#if ENABLE_HUSH_JOB
+ /* We asked to wait for bg or orphaned children */
+ /* No need to remember exitcode in this case */
+ for (pi = job_list; pi; pi = pi->next) {
+ prognum = 0;
+ while (prognum < pi->num_progs) {
+ if (pi->progs[prognum].pid == childpid)
+ goto found_pi_and_prognum;
+ prognum++;
+ }
+ }
+#endif
+
+ /* Happens when shell is used as init process (init=/bin/sh) */
+ debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
+ goto wait_more;
+
+#if ENABLE_HUSH_JOB
+ found_pi_and_prognum:
+ if (dead) {
+ /* child exited */
+ pi->progs[prognum].pid = 0;
+ pi->running_progs--;
+ if (!pi->running_progs) {
+ printf(JOB_STATUS_FORMAT, pi->jobid,
+ "Done", pi->cmdtext);
+ delete_finished_bg_job(pi);
+ }
+ } else {
+ /* child stopped */
+ pi->stopped_progs++;
+ pi->progs[prognum].is_stopped = 1;
+ }
+#endif
+ }
+
+ /* wait found no children or failed */
+
+ if (childpid && errno != ECHILD)
+ bb_perror_msg("waitpid");
+ return rcode;
+}
+
+#if ENABLE_HUSH_JOB
+static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
+{
+ pid_t p;
+ int rcode = checkjobs(fg_pipe);
+ /* Job finished, move the shell to the foreground */
+ p = getpgid(0); /* pgid of our process */
+ debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
+ if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
+ bb_perror_msg("tcsetpgrp-4a");
+ return rcode;
+}
+#endif
+
+/* run_pipe() starts all the jobs, but doesn't wait for anything
+ * to finish. See checkjobs().
+ *
+ * return code is normally -1, when the caller has to wait for children
+ * to finish to determine the exit status of the pipe. If the pipe
+ * is a simple builtin command, however, the action is done by the
+ * time run_pipe returns, and the exit code is provided as the
+ * return value.
+ *
+ * The input of the pipe is always stdin, the output is always
+ * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
+ * because it tries to avoid running the command substitution in
+ * subshell, when that is in fact necessary. The subshell process
+ * now has its stdout directed to the input of the appropriate pipe,
+ * so this routine is noticeably simpler.
+ *
+ * Returns -1 only if started some children. IOW: we have to
+ * mask out retvals of builtins etc with 0xff!
+ */
+static int run_pipe(struct pipe *pi)
+{
+ int i;
+ int nextin;
+ int pipefds[2]; /* pipefds[0] is for reading */
+ struct child_prog *child;
+ const struct built_in_command *x;
+ char *p;
+ /* it is not always needed, but we aim to smaller code */
+ int squirrel[] = { -1, -1, -1 };
+ int rcode;
+ const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
+
+ debug_printf_exec("run_pipe start: single_fg=%d\n", single_fg);
+
+#if ENABLE_HUSH_JOB
+ pi->pgrp = -1;
+#endif
+ pi->running_progs = 1;
+ pi->stopped_progs = 0;
+
+ /* Check if this is a simple builtin (not part of a pipe).
+ * Builtins within pipes have to fork anyway, and are handled in
+ * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
+ */
+ child = &(pi->progs[0]);
+ if (single_fg && child->group && child->subshell == 0) {
+ debug_printf("non-subshell grouping\n");
+ setup_redirects(child, squirrel);
+ debug_printf_exec(": run_list\n");
+ rcode = run_list(child->group) & 0xff;
+ restore_redirects(squirrel);
+ debug_printf_exec("run_pipe return %d\n", rcode);
+ return rcode;
+ }
+
+ if (single_fg && child->argv != NULL) {
+ char **argv_expanded;
+ char **argv = child->argv;
+
+ for (i = 0; is_assignment(argv[i]); i++)
+ continue;
+ if (i != 0 && argv[i] == NULL) {
+ /* assignments, but no command: set the local environment */
+ for (i = 0; argv[i] != NULL; i++) {
+ debug_printf("local environment set: %s\n", argv[i]);
+ p = expand_string_to_string(argv[i]);
+ set_local_var(p, 0);
+ }
+ return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
+ }
+ for (i = 0; is_assignment(argv[i]); i++) {
+ p = expand_string_to_string(argv[i]);
+ //sp: child->sp--;
+ putenv(p);
+ }
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(argv[i], x->cmd) == 0) {
+ if (x->function == builtin_exec && argv[i+1] == NULL) {
+ debug_printf("magic exec\n");
+ setup_redirects(child, NULL);
+ return EXIT_SUCCESS;
+ }
+ debug_printf("builtin inline %s\n", argv[0]);
+ /* XXX setup_redirects acts on file descriptors, not FILEs.
+ * This is perfect for work that comes after exec().
+ * Is it really safe for inline use? Experimentally,
+ * things seem to work with glibc. */
+ setup_redirects(child, squirrel);
+ debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv[i+1]);
+ //sp: if (child->sp) /* btw we can do it unconditionally... */
+ argv_expanded = expand_strvec_to_strvec(argv + i);
+ rcode = x->function(argv_expanded) & 0xff;
+ free(argv_expanded);
+ restore_redirects(squirrel);
+ debug_printf_exec("run_pipe return %d\n", rcode);
+ return rcode;
+ }
+ }
+#if ENABLE_FEATURE_SH_STANDALONE
+ {
+ int a = find_applet_by_name(argv[i]);
+ if (a >= 0 && APPLET_IS_NOFORK(a)) {
+ setup_redirects(child, squirrel);
+ save_nofork_data(&nofork_save);
+ argv_expanded = argv + i;
+ //sp: if (child->sp)
+ argv_expanded = expand_strvec_to_strvec(argv + i);
+ debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
+ rcode = run_nofork_applet_prime(&nofork_save, a, argv_expanded) & 0xff;
+ free(argv_expanded);
+ restore_redirects(squirrel);
+ debug_printf_exec("run_pipe return %d\n", rcode);
+ return rcode;
+ }
+ }
+#endif
+ }
+
+ /* Disable job control signals for shell (parent) and
+ * for initial child code after fork */
+ set_jobctrl_sighandler(SIG_IGN);
+
+ /* Going to fork a child per each pipe member */
+ pi->running_progs = 0;
+ nextin = 0;
+
+ for (i = 0; i < pi->num_progs; i++) {
+ child = &(pi->progs[i]);
+ if (child->argv)
+ debug_printf_exec(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
+ else
+ debug_printf_exec(": pipe member with no argv\n");
+
+ /* pipes are inserted between pairs of commands */
+ pipefds[0] = 0;
+ pipefds[1] = 1;
+ if ((i + 1) < pi->num_progs)
+ xpipe(pipefds);
+
+ child->pid = BB_MMU ? fork() : vfork();
+ if (!child->pid) { /* child */
+ if (ENABLE_HUSH_JOB)
+ die_sleep = 0; /* let nofork's xfuncs die */
+#if ENABLE_HUSH_JOB
+ /* Every child adds itself to new process group
+ * with pgid == pid_of_first_child_in_pipe */
+ if (run_list_level == 1 && interactive_fd) {
+ pid_t pgrp;
+ /* Don't do pgrp restore anymore on fatal signals */
+ set_fatal_sighandler(SIG_DFL);
+ pgrp = pi->pgrp;
+ if (pgrp < 0) /* true for 1st process only */
+ pgrp = getpid();
+ if (setpgid(0, pgrp) == 0 && pi->followup != PIPE_BG) {
+ /* We do it in *every* child, not just first,
+ * to avoid races */
+ tcsetpgrp(interactive_fd, pgrp);
+ }
+ }
+#endif
+ xmove_fd(nextin, 0);
+ xmove_fd(pipefds[1], 1); /* write end */
+ if (pipefds[0] > 1)
+ close(pipefds[0]); /* read end */
+ /* Like bash, explicit redirects override pipes,
+ * and the pipe fd is available for dup'ing. */
+ setup_redirects(child, NULL);
+
+ /* Restore default handlers just prior to exec */
+ set_jobctrl_sighandler(SIG_DFL);
+ set_misc_sighandler(SIG_DFL);
+ signal(SIGCHLD, SIG_DFL);
+ pseudo_exec(child); /* does not return */
+ }
+
+ if (child->pid < 0) { /* [v]fork failed */
+ /* Clearly indicate, was it fork or vfork */
+ bb_perror_msg(BB_MMU ? "fork" : "vfork");
+ } else {
+ pi->running_progs++;
+#if ENABLE_HUSH_JOB
+ /* Second and next children need to know pid of first one */
+ if (pi->pgrp < 0)
+ pi->pgrp = child->pid;
+#endif
+ }
+
+ if (i)
+ close(nextin);
+ if ((i + 1) < pi->num_progs)
+ close(pipefds[1]); /* write end */
+ /* Pass read (output) pipe end to next iteration */
+ nextin = pipefds[0];
+ }
+
+ if (!pi->running_progs) {
+ debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
+ return 1;
+ }
+
+ debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->running_progs);
+ return -1;
+}
+
+#ifndef debug_print_tree
+static void debug_print_tree(struct pipe *pi, int lvl)
+{
+ static const char *PIPE[] = {
+ [PIPE_SEQ] = "SEQ",
+ [PIPE_AND] = "AND",
+ [PIPE_OR ] = "OR" ,
+ [PIPE_BG ] = "BG" ,
+ };
+ static const char *RES[] = {
+ [RES_NONE ] = "NONE" ,
+#if ENABLE_HUSH_IF
+ [RES_IF ] = "IF" ,
+ [RES_THEN ] = "THEN" ,
+ [RES_ELIF ] = "ELIF" ,
+ [RES_ELSE ] = "ELSE" ,
+ [RES_FI ] = "FI" ,
+#endif
+#if ENABLE_HUSH_LOOPS
+ [RES_FOR ] = "FOR" ,
+ [RES_WHILE] = "WHILE",
+ [RES_UNTIL] = "UNTIL",
+ [RES_DO ] = "DO" ,
+ [RES_DONE ] = "DONE" ,
+ [RES_IN ] = "IN" ,
+#endif
+ [RES_XXXX ] = "XXXX" ,
+ [RES_SNTX ] = "SNTX" ,
+ };
+
+ int pin, prn;
+
+ pin = 0;
+ while (pi) {
+ fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
+ pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
+ prn = 0;
+ while (prn < pi->num_progs) {
+ struct child_prog *child = &pi->progs[prn];
+ char **argv = child->argv;
+
+ fprintf(stderr, "%*s prog %d", lvl*2, "", prn);
+ if (child->group) {
+ fprintf(stderr, " group %s: (argv=%p)\n",
+ (child->subshell ? "()" : "{}"),
+ argv);
+ debug_print_tree(child->group, lvl+1);
+ prn++;
+ continue;
+ }
+ if (argv) while (*argv) {
+ fprintf(stderr, " '%s'", *argv);
+ argv++;
+ }
+ fprintf(stderr, "\n");
+ prn++;
+ }
+ pi = pi->next;
+ pin++;
+ }
+}
+#endif
+
+/* NB: called by pseudo_exec, and therefore must not modify any
+ * global data until exec/_exit (we can be a child after vfork!) */
+static int run_list(struct pipe *pi)
+{
+ struct pipe *rpipe;
+#if ENABLE_HUSH_LOOPS
+ char *for_varname = NULL;
+ char **for_lcur = NULL;
+ char **for_list = NULL;
+ int flag_rep = 0;
+#endif
+ int flag_skip = 1;
+ int rcode = 0; /* probably for gcc only */
+ int flag_restore = 0;
+#if ENABLE_HUSH_IF
+ int if_code = 0, next_if_code = 0; /* need double-buffer to handle elif */
+#else
+ enum { if_code = 0, next_if_code = 0 };
+#endif
+ reserved_style rword;
+ reserved_style skip_more_for_this_rword = RES_XXXX;
+
+ debug_printf_exec("run_list start lvl %d\n", run_list_level + 1);
+
+#if ENABLE_HUSH_LOOPS
+ /* check syntax for "for" */
+ for (rpipe = pi; rpipe; rpipe = rpipe->next) {
+ if ((rpipe->res_word == RES_IN || rpipe->res_word == RES_FOR)
+ && (rpipe->next == NULL)
+ ) {
+ syntax("malformed for"); /* no IN or no commands after IN */
+ debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
+ return 1;
+ }
+ if ((rpipe->res_word == RES_IN && rpipe->next->res_word == RES_IN && rpipe->next->progs[0].argv != NULL)
+ || (rpipe->res_word == RES_FOR && rpipe->next->res_word != RES_IN)
+ ) {
+ /* TODO: what is tested in the first condition? */
+ syntax("malformed for"); /* 2nd condition: not followed by IN */
+ debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
+ return 1;
+ }
+ }
+#else
+ rpipe = NULL;
+#endif
+
+#if ENABLE_HUSH_JOB
+ /* Example of nested list: "while true; do { sleep 1 | exit 2; } done".
+ * We are saving state before entering outermost list ("while...done")
+ * so that ctrl-Z will correctly background _entire_ outermost list,
+ * not just a part of it (like "sleep 1 | exit 2") */
+ if (++run_list_level == 1 && interactive_fd) {
+ if (sigsetjmp(toplevel_jb, 1)) {
+ /* ctrl-Z forked and we are parent; or ctrl-C.
+ * Sighandler has longjmped us here */
+ signal(SIGINT, SIG_IGN);
+ signal(SIGTSTP, SIG_IGN);
+ /* Restore level (we can be coming from deep inside
+ * nested levels) */
+ run_list_level = 1;
+#if ENABLE_FEATURE_SH_STANDALONE
+ if (nofork_save.saved) { /* if save area is valid */
+ debug_printf_jobs("exiting nofork early\n");
+ restore_nofork_data(&nofork_save);
+ }
+#endif
+ if (ctrl_z_flag) {
+ /* ctrl-Z has forked and stored pid of the child in pi->pid.
+ * Remember this child as background job */
+ insert_bg_job(pi);
+ } else {
+ /* ctrl-C. We just stop doing whatever we were doing */
+ bb_putchar('\n');
+ }
+ rcode = 0;
+ goto ret;
+ }
+ /* ctrl-Z handler will store pid etc in pi */
+ toplevel_list = pi;
+ ctrl_z_flag = 0;
+#if ENABLE_FEATURE_SH_STANDALONE
+ nofork_save.saved = 0; /* in case we will run a nofork later */
+#endif
+ signal_SA_RESTART_empty_mask(SIGTSTP, handler_ctrl_z);
+ signal(SIGINT, handler_ctrl_c);
+ }
+#endif /* JOB */
+
+ for (; pi; pi = flag_restore ? rpipe : pi->next) {
+//why? int save_num_progs;
+ rword = pi->res_word;
+#if ENABLE_HUSH_LOOPS
+ if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) {
+ flag_restore = 0;
+ if (!rpipe) {
+ flag_rep = 0;
+ rpipe = pi;
+ }
+ }
+#endif
+ debug_printf_exec(": rword=%d if_code=%d next_if_code=%d skip_more=%d\n",
+ rword, if_code, next_if_code, skip_more_for_this_rword);
+ if (rword == skip_more_for_this_rword && flag_skip) {
+ if (pi->followup == PIPE_SEQ)
+ flag_skip = 0;
+ continue;
+ }
+ flag_skip = 1;
+ skip_more_for_this_rword = RES_XXXX;
+#if ENABLE_HUSH_IF
+ if (rword == RES_THEN || rword == RES_ELSE)
+ if_code = next_if_code;
+ if (rword == RES_THEN && if_code)
+ continue;
+ if (rword == RES_ELSE && !if_code)
+ continue;
+ if (rword == RES_ELIF && !if_code)
+ break;
+#endif
+#if ENABLE_HUSH_LOOPS
+ if (rword == RES_FOR && pi->num_progs) {
+ if (!for_lcur) {
+ /* first loop through for */
+ /* if no variable values after "in" we skip "for" */
+ if (!pi->next->progs->argv)
+ continue;
+ /* create list of variable values */
+ for_list = expand_strvec_to_strvec(pi->next->progs->argv);
+ for_lcur = for_list;
+ for_varname = pi->progs->argv[0];
+ pi->progs->argv[0] = NULL;
+ flag_rep = 1;
+ }
+ free(pi->progs->argv[0]);
+ if (!*for_lcur) {
+ /* for loop is over, clean up */
+ free(for_list);
+ for_lcur = NULL;
+ flag_rep = 0;
+ pi->progs->argv[0] = for_varname;
+ continue;
+ }
+ /* insert next value from for_lcur */
+ /* vda: does it need escaping? */
+ pi->progs->argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
+ }
+ if (rword == RES_IN)
+ continue;
+ if (rword == RES_DO) {
+ if (!flag_rep)
+ continue;
+ }
+ if (rword == RES_DONE) {
+ if (flag_rep) {
+ flag_restore = 1;
+ } else {
+ rpipe = NULL;
+ }
+ }
+#endif
+ if (pi->num_progs == 0)
+ continue;
+//why? save_num_progs = pi->num_progs;
+ debug_printf_exec(": run_pipe with %d members\n", pi->num_progs);
+ rcode = run_pipe(pi);
+ if (rcode != -1) {
+ /* We only ran a builtin: rcode was set by the return value
+ * of run_pipe(), and we don't need to wait for anything. */
+ } else if (pi->followup == PIPE_BG) {
+ /* What does bash do with attempts to background builtins? */
+ /* Even bash 3.2 doesn't do that well with nested bg:
+ * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
+ * I'm NOT treating inner &'s as jobs */
+#if ENABLE_HUSH_JOB
+ if (run_list_level == 1)
+ insert_bg_job(pi);
+#endif
+ rcode = EXIT_SUCCESS;
+ } else {
+#if ENABLE_HUSH_JOB
+ if (run_list_level == 1 && interactive_fd) {
+ /* waits for completion, then fg's main shell */
+ rcode = checkjobs_and_fg_shell(pi);
+ } else
+#endif
+ {
+ /* this one just waits for completion */
+ rcode = checkjobs(pi);
+ }
+ debug_printf_exec(": checkjobs returned %d\n", rcode);
+ }
+ debug_printf_exec(": setting last_return_code=%d\n", rcode);
+ last_return_code = rcode;
+//why? pi->num_progs = save_num_progs;
+#if ENABLE_HUSH_IF
+ if (rword == RES_IF || rword == RES_ELIF)
+ next_if_code = rcode; /* can be overwritten a number of times */
+#endif
+#if ENABLE_HUSH_LOOPS
+ if (rword == RES_WHILE)
+ flag_rep = !last_return_code;
+ if (rword == RES_UNTIL)
+ flag_rep = last_return_code;
+#endif
+ if ((rcode == EXIT_SUCCESS && pi->followup == PIPE_OR)
+ || (rcode != EXIT_SUCCESS && pi->followup == PIPE_AND)
+ ) {
+ skip_more_for_this_rword = rword;
+ }
+ checkjobs(NULL);
+ }
+
+#if ENABLE_HUSH_JOB
+ if (ctrl_z_flag) {
+ /* ctrl-Z forked somewhere in the past, we are the child,
+ * and now we completed running the list. Exit. */
+ exit(rcode);
+ }
+ ret:
+ if (!--run_list_level && interactive_fd) {
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGINT, SIG_IGN);
+ }
+#endif
+ debug_printf_exec("run_list lvl %d return %d\n", run_list_level + 1, rcode);
+ return rcode;
+}
+
+/* return code is the exit status of the pipe */
+static int free_pipe(struct pipe *pi, int indent)
+{
+ char **p;
+ struct child_prog *child;
+ struct redir_struct *r, *rnext;
+ int a, i, ret_code = 0;
+
+ if (pi->stopped_progs > 0)
+ return ret_code;
+ debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
+ for (i = 0; i < pi->num_progs; i++) {
+ child = &pi->progs[i];
+ debug_printf_clean("%s command %d:\n", indenter(indent), i);
+ if (child->argv) {
+ for (a = 0, p = child->argv; *p; a++, p++) {
+ debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
+ }
+ free_strings(child->argv);
+ child->argv = NULL;
+ } else if (child->group) {
+ debug_printf_clean("%s begin group (subshell:%d)\n", indenter(indent), child->subshell);
+ ret_code = free_pipe_list(child->group, indent+3);
+ debug_printf_clean("%s end group\n", indenter(indent));
+ } else {
+ debug_printf_clean("%s (nil)\n", indenter(indent));
+ }
+ for (r = child->redirects; r; r = rnext) {
+ debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
+ if (r->dup == -1) {
+ /* guard against the case >$FOO, where foo is unset or blank */
+ if (r->glob_word) {
+ debug_printf_clean(" %s\n", r->glob_word[0]);
+ free_strings(r->glob_word);
+ r->glob_word = NULL;
+ }
+ } else {
+ debug_printf_clean("&%d\n", r->dup);
+ }
+ rnext = r->next;
+ free(r);
+ }
+ child->redirects = NULL;
+ }
+ free(pi->progs); /* children are an array, they get freed all at once */
+ pi->progs = NULL;
+#if ENABLE_HUSH_JOB
+ free(pi->cmdtext);
+ pi->cmdtext = NULL;
+#endif
+ return ret_code;
+}
+
+static int free_pipe_list(struct pipe *head, int indent)
+{
+ int rcode = 0; /* if list has no members */
+ struct pipe *pi, *next;
+
+ for (pi = head; pi; pi = next) {
+ debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
+ rcode = free_pipe(pi, indent);
+ debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
+ next = pi->next;
+ /*pi->next = NULL;*/
+ free(pi);
+ }
+ return rcode;
+}
+
+/* Select which version we will use */
+static int run_and_free_list(struct pipe *pi)
+{
+ int rcode = 0;
+ debug_printf_exec("run_and_free_list entered\n");
+ if (!fake_mode) {
+ debug_printf_exec(": run_list with %d members\n", pi->num_progs);
+ rcode = run_list(pi);
+ }
+ /* free_pipe_list has the side effect of clearing memory.
+ * In the long run that function can be merged with run_list,
+ * but doing that now would hobble the debugging effort. */
+ free_pipe_list(pi, /* indent: */ 0);
+ debug_printf_exec("run_nad_free_list return %d\n", rcode);
+ return rcode;
+}
+
+/* Whoever decided to muck with glob internal data is AN IDIOT! */
+/* uclibc happily changed the way it works (and it has rights to do so!),
+ all hell broke loose (SEGVs) */
+
+/* The API for glob is arguably broken. This routine pushes a non-matching
+ * string into the output structure, removing non-backslashed backslashes.
+ * If someone can prove me wrong, by performing this function within the
+ * original glob(3) api, feel free to rewrite this routine into oblivion.
+ * XXX broken if the last character is '\\', check that before calling.
+ */
+static char **globhack(const char *src, char **strings)
+{
+ int cnt;
+ const char *s;
+ char *v, *dest;
+
+ for (cnt = 1, s = src; s && *s; s++) {
+ if (*s == '\\') s++;
+ cnt++;
+ }
+ v = dest = xmalloc(cnt);
+ for (s = src; s && *s; s++, dest++) {
+ if (*s == '\\') s++;
+ *dest = *s;
+ }
+ *dest = '\0';
+
+ return add_string_to_strings(strings, v);
+}
+
+/* XXX broken if the last character is '\\', check that before calling */
+static int glob_needed(const char *s)
+{
+ for (; *s; s++) {
+ if (*s == '\\')
+ s++;
+ if (strchr("*[?", *s))
+ return 1;
+ }
+ return 0;
+}
+
+static int xglob(o_string *dest, char ***pglob)
+{
+ /* short-circuit for null word */
+ /* we can code this better when the debug_printf's are gone */
+ if (dest->length == 0) {
+ if (dest->nonnull) {
+ /* bash man page calls this an "explicit" null */
+ *pglob = globhack(dest->data, *pglob);
+ }
+ return 0;
+ }
+
+ if (glob_needed(dest->data)) {
+ glob_t globdata;
+ int gr;
+
+ memset(&globdata, 0, sizeof(globdata));
+ gr = glob(dest->data, 0, NULL, &globdata);
+ debug_printf("glob returned %d\n", gr);
+ if (gr == GLOB_NOSPACE)
+ bb_error_msg_and_die("out of memory during glob");
+ if (gr == GLOB_NOMATCH) {
+ debug_printf("globhack returned %d\n", gr);
+ /* quote removal, or more accurately, backslash removal */
+ *pglob = globhack(dest->data, *pglob);
+ globfree(&globdata);
+ return 0;
+ }
+ if (gr != 0) { /* GLOB_ABORTED ? */
+ bb_error_msg("glob(3) error %d", gr);
+ }
+ if (globdata.gl_pathv && globdata.gl_pathv[0])
+ *pglob = add_strings_to_strings(1, *pglob, globdata.gl_pathv);
+ globfree(&globdata);
+ return gr;
+ }
+
+ *pglob = globhack(dest->data, *pglob);
+ return 0;
+}
+
+/* expand_strvec_to_strvec() takes a list of strings, expands
+ * all variable references within and returns a pointer to
+ * a list of expanded strings, possibly with larger number
+ * of strings. (Think VAR="a b"; echo $VAR).
+ * This new list is allocated as a single malloc block.
+ * NULL-terminated list of char* pointers is at the beginning of it,
+ * followed by strings themself.
+ * Caller can deallocate entire list by single free(list). */
+
+/* Helpers first:
+ * count_XXX estimates size of the block we need. It's okay
+ * to over-estimate sizes a bit, if it makes code simpler */
+static int count_ifs(const char *str)
+{
+ int cnt = 0;
+ debug_printf_expand("count_ifs('%s') ifs='%s'", str, ifs);
+ while (1) {
+ str += strcspn(str, ifs);
+ if (!*str) break;
+ str++; /* str += strspn(str, ifs); */
+ cnt++; /* cnt += strspn(str, ifs); - but this code is larger */
+ }
+ debug_printf_expand(" return %d\n", cnt);
+ return cnt;
+}
+
+static void count_var_expansion_space(int *countp, int *lenp, char *arg)
+{
+ char first_ch;
+ int i;
+ int len = *lenp;
+ int count = *countp;
+ const char *val;
+ char *p;
+
+ while ((p = strchr(arg, SPECIAL_VAR_SYMBOL))) {
+ len += p - arg;
+ arg = ++p;
+ p = strchr(p, SPECIAL_VAR_SYMBOL);
+ first_ch = arg[0];
+
+ switch (first_ch & 0x7f) {
+ /* high bit in 1st_ch indicates that var is double-quoted */
+ case '$': /* pid */
+ case '!': /* bg pid */
+ case '?': /* exitcode */
+ case '#': /* argc */
+ len += sizeof(int)*3 + 1; /* enough for int */
+ break;
+ case '*':
+ case '@':
+ for (i = 1; global_argv[i]; i++) {
+ len += strlen(global_argv[i]) + 1;
+ count++;
+ if (!(first_ch & 0x80))
+ count += count_ifs(global_argv[i]);
+ }
+ break;
+ default:
+ *p = '\0';
+ arg[0] = first_ch & 0x7f;
+ if (isdigit(arg[0])) {
+ i = xatoi_u(arg);
+ val = NULL;
+ if (i < global_argc)
+ val = global_argv[i];
+ } else
+ val = lookup_param(arg);
+ arg[0] = first_ch;
+ *p = SPECIAL_VAR_SYMBOL;
+
+ if (val) {
+ len += strlen(val) + 1;
+ if (!(first_ch & 0x80))
+ count += count_ifs(val);
+ }
+ }
+ arg = ++p;
+ }
+
+ len += strlen(arg) + 1;
+ count++;
+ *lenp = len;
+ *countp = count;
+}
+
+/* Store given string, finalizing the word and starting new one whenever
+ * we encounter ifs char(s). This is used for expanding variable values.
+ * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
+static int expand_on_ifs(char **list, int n, char **posp, const char *str)
+{
+ char *pos = *posp;
+ while (1) {
+ int word_len = strcspn(str, ifs);
+ if (word_len) {
+ memcpy(pos, str, word_len); /* store non-ifs chars */
+ pos += word_len;
+ str += word_len;
+ }
+ if (!*str) /* EOL - do not finalize word */
+ break;
+ *pos++ = '\0';
+ if (n) debug_printf_expand("expand_on_ifs finalized list[%d]=%p '%s' "
+ "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
+ strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
+ list[n++] = pos;
+ str += strspn(str, ifs); /* skip ifs chars */
+ }
+ *posp = pos;
+ return n;
+}
+
+/* Expand all variable references in given string, adding words to list[]
+ * at n, n+1,... positions. Return updated n (so that list[n] is next one
+ * to be filled). This routine is extremely tricky: has to deal with
+ * variables/parameters with whitespace, $* and $@, and constructs like
+ * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
+/* NB: another bug is that we cannot detect empty strings yet:
+ * "" or $empty"" expands to zero words, has to expand to empty word */
+static int expand_vars_to_list(char **list, int n, char **posp, char *arg, char or_mask)
+{
+ /* or_mask is either 0 (normal case) or 0x80
+ * (expansion of right-hand side of assignment == 1-element expand) */
+
+ char first_ch, ored_ch;
+ int i;
+ const char *val;
+ char *p;
+ char *pos = *posp;
+
+ ored_ch = 0;
+
+ if (n) debug_printf_expand("expand_vars_to_list finalized list[%d]=%p '%s' "
+ "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
+ strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
+ list[n++] = pos;
+
+ while ((p = strchr(arg, SPECIAL_VAR_SYMBOL))) {
+ memcpy(pos, arg, p - arg);
+ pos += (p - arg);
+ arg = ++p;
+ p = strchr(p, SPECIAL_VAR_SYMBOL);
+
+ first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
+ ored_ch |= first_ch;
+ val = NULL;
+ switch (first_ch & 0x7f) {
+ /* Highest bit in first_ch indicates that var is double-quoted */
+ case '$': /* pid */
+ /* FIXME: (echo $$) should still print pid of main shell */
+ val = utoa(getpid()); /* rootpid? */
+ break;
+ case '!': /* bg pid */
+ val = last_bg_pid ? utoa(last_bg_pid) : (char*)"";
+ break;
+ case '?': /* exitcode */
+ val = utoa(last_return_code);
+ break;
+ case '#': /* argc */
+ val = utoa(global_argc ? global_argc-1 : 0);
+ break;
+ case '*':
+ case '@':
+ i = 1;
+ if (!global_argv[i])
+ break;
+ if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
+ while (global_argv[i]) {
+ n = expand_on_ifs(list, n, &pos, global_argv[i]);
+ debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, global_argc-1);
+ if (global_argv[i++][0] && global_argv[i]) {
+ /* this argv[] is not empty and not last:
+ * put terminating NUL, start new word */
+ *pos++ = '\0';
+ if (n) debug_printf_expand("expand_vars_to_list 2 finalized list[%d]=%p '%s' "
+ "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
+ strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
+ list[n++] = pos;
+ }
+ }
+ } else
+ /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
+ * and in this case should treat it like '$*' - see 'else...' below */
+ if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
+ while (1) {
+ strcpy(pos, global_argv[i]);
+ pos += strlen(global_argv[i]);
+ if (++i >= global_argc)
+ break;
+ *pos++ = '\0';
+ if (n) debug_printf_expand("expand_vars_to_list 3 finalized list[%d]=%p '%s' "
+ "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
+ strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
+ list[n++] = pos;
+ }
+ } else { /* quoted $*: add as one word */
+ while (1) {
+ strcpy(pos, global_argv[i]);
+ pos += strlen(global_argv[i]);
+ if (!global_argv[++i])
+ break;
+ if (ifs[0])
+ *pos++ = ifs[0];
+ }
+ }
+ break;
+ default:
+ *p = '\0';
+ arg[0] = first_ch & 0x7f;
+ if (isdigit(arg[0])) {
+ i = xatoi_u(arg);
+ val = NULL;
+ if (i < global_argc)
+ val = global_argv[i];
+ } else
+ val = lookup_param(arg);
+ arg[0] = first_ch;
+ *p = SPECIAL_VAR_SYMBOL;
+ if (!(first_ch & 0x80)) { /* unquoted $VAR */
+ if (val) {
+ n = expand_on_ifs(list, n, &pos, val);
+ val = NULL;
+ }
+ } /* else: quoted $VAR, val will be appended at pos */
+ }
+ if (val) {
+ strcpy(pos, val);
+ pos += strlen(val);
+ }
+ arg = ++p;
+ }
+ debug_printf_expand("expand_vars_to_list adding tail '%s' at %p\n", arg, pos);
+ strcpy(pos, arg);
+ pos += strlen(arg) + 1;
+ if (pos == list[n-1] + 1) { /* expansion is empty */
+ if (!(ored_ch & 0x80)) { /* all vars were not quoted... */
+ debug_printf_expand("expand_vars_to_list list[%d] empty, going back\n", n);
+ pos--;
+ n--;
+ }
+ }
+
+ *posp = pos;
+ return n;
+}
+
+static char **expand_variables(char **argv, char or_mask)
+{
+ int n;
+ int count = 1;
+ int len = 0;
+ char *pos, **v, **list;
+
+ v = argv;
+ if (!*v) debug_printf_expand("count_var_expansion_space: "
+ "argv[0]=NULL count=%d len=%d alloc_space=%d\n",
+ count, len, sizeof(char*) * count + len);
+ while (*v) {
+ count_var_expansion_space(&count, &len, *v);
+ debug_printf_expand("count_var_expansion_space: "
+ "'%s' count=%d len=%d alloc_space=%d\n",
+ *v, count, len, sizeof(char*) * count + len);
+ v++;
+ }
+ len += sizeof(char*) * count; /* total to alloc */
+ list = xmalloc(len);
+ pos = (char*)(list + count);
+ debug_printf_expand("list=%p, list[0] should be %p\n", list, pos);
+ n = 0;
+ v = argv;
+ while (*v)
+ n = expand_vars_to_list(list, n, &pos, *v++, or_mask);
+
+ if (n) debug_printf_expand("finalized list[%d]=%p '%s' "
+ "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
+ strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
+ list[n] = NULL;
+
+#ifdef DEBUG_EXPAND
+ {
+ int m = 0;
+ while (m <= n) {
+ debug_printf_expand("list[%d]=%p '%s'\n", m, list[m], list[m]);
+ m++;
+ }
+ debug_printf_expand("used_space=%d\n", pos - (char*)list);
+ }
+#endif
+ if (ENABLE_HUSH_DEBUG)
+ if (pos - (char*)list > len)
+ bb_error_msg_and_die("BUG in varexp");
+ return list;
+}
+
+static char **expand_strvec_to_strvec(char **argv)
+{
+ return expand_variables(argv, 0);
+}
+
+static char *expand_string_to_string(const char *str)
+{
+ char *argv[2], **list;
+
+ argv[0] = (char*)str;
+ argv[1] = NULL;
+ list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
+ if (ENABLE_HUSH_DEBUG)
+ if (!list[0] || list[1])
+ bb_error_msg_and_die("BUG in varexp2");
+ /* actually, just move string 2*sizeof(char*) bytes back */
+ strcpy((char*)list, list[0]);
+ debug_printf_expand("string_to_string='%s'\n", (char*)list);
+ return (char*)list;
+}
+
+static char* expand_strvec_to_string(char **argv)
+{
+ char **list;
+
+ list = expand_variables(argv, 0x80);
+ /* Convert all NULs to spaces */
+ if (list[0]) {
+ int n = 1;
+ while (list[n]) {
+ if (ENABLE_HUSH_DEBUG)
+ if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
+ bb_error_msg_and_die("BUG in varexp3");
+ list[n][-1] = ' '; /* TODO: or to ifs[0]? */
+ n++;
+ }
+ }
+ strcpy((char*)list, list[0]);
+ debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
+ return (char*)list;
+}
+
+/* This is used to get/check local shell variables */
+static struct variable *get_local_var(const char *name)
+{
+ struct variable *cur;
+ int len;
+
+ if (!name)
+ return NULL;
+ len = strlen(name);
+ for (cur = top_var; cur; cur = cur->next) {
+ if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
+ return cur;
+ }
+ return NULL;
+}
+
+/* str holds "NAME=VAL" and is expected to be malloced.
+ * We take ownership of it. */
+static int set_local_var(char *str, int flg_export)
+{
+ struct variable *cur;
+ char *value;
+ int name_len;
+
+ value = strchr(str, '=');
+ if (!value) { /* not expected to ever happen? */
+ free(str);
+ return -1;
+ }
+
+ name_len = value - str + 1; /* including '=' */
+ cur = top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
+ while (1) {
+ if (strncmp(cur->varstr, str, name_len) != 0) {
+ if (!cur->next) {
+ /* Bail out. Note that now cur points
+ * to last var in linked list */
+ break;
+ }
+ cur = cur->next;
+ continue;
+ }
+ /* We found an existing var with this name */
+ *value = '\0';
+ if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", str);
+ free(str);
+ return -1;
+ }
+ unsetenv(str); /* just in case */
+ *value = '=';
+ if (strcmp(cur->varstr, str) == 0) {
+ free_and_exp:
+ free(str);
+ goto exp;
+ }
+ if (cur->max_len >= strlen(str)) {
+ /* This one is from startup env, reuse space */
+ strcpy(cur->varstr, str);
+ goto free_and_exp;
+ }
+ /* max_len == 0 signifies "malloced" var, which we can
+ * (and has to) free */
+ if (!cur->max_len)
+ free(cur->varstr);
+ cur->max_len = 0;
+ goto set_str_and_exp;
+ }
+
+ /* Not found - create next variable struct */
+ cur->next = xzalloc(sizeof(*cur));
+ cur = cur->next;
+
+ set_str_and_exp:
+ cur->varstr = str;
+ exp:
+ if (flg_export)
+ cur->flg_export = 1;
+ if (cur->flg_export)
+ return putenv(cur->varstr);
+ return 0;
+}
+
+static void unset_local_var(const char *name)
+{
+ struct variable *cur;
+ struct variable *prev = prev; /* for gcc */
+ int name_len;
+
+ if (!name)
+ return;
+ name_len = strlen(name);
+ cur = top_var;
+ while (cur) {
+ if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
+ if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", name);
+ return;
+ }
+ /* prev is ok to use here because 1st variable, HUSH_VERSION,
+ * is ro, and we cannot reach this code on the 1st pass */
+ prev->next = cur->next;
+ unsetenv(cur->varstr);
+ if (!cur->max_len)
+ free(cur->varstr);
+ free(cur);
+ return;
+ }
+ prev = cur;
+ cur = cur->next;
+ }
+}
+
+static int is_assignment(const char *s)
+{
+ if (!s || !isalpha(*s))
+ return 0;
+ s++;
+ while (isalnum(*s) || *s == '_')
+ s++;
+ return *s == '=';
+}
+
+/* the src parameter allows us to peek forward to a possible &n syntax
+ * for file descriptor duplication, e.g., "2>&1".
+ * Return code is 0 normally, 1 if a syntax error is detected in src.
+ * Resource errors (in xmalloc) cause the process to exit */
+static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
+ struct in_str *input)
+{
+ struct child_prog *child = ctx->child;
+ struct redir_struct *redir = child->redirects;
+ struct redir_struct *last_redir = NULL;
+
+ /* Create a new redir_struct and drop it onto the end of the linked list */
+ while (redir) {
+ last_redir = redir;
+ redir = redir->next;
+ }
+ redir = xzalloc(sizeof(struct redir_struct));
+ /* redir->next = NULL; */
+ /* redir->glob_word = NULL; */
+ if (last_redir) {
+ last_redir->next = redir;
+ } else {
+ child->redirects = redir;
+ }
+
+ redir->type = style;
+ redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
+
+ debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
+
+ /* Check for a '2>&1' type redirect */
+ redir->dup = redirect_dup_num(input);
+ if (redir->dup == -2) return 1; /* syntax error */
+ if (redir->dup != -1) {
+ /* Erik had a check here that the file descriptor in question
+ * is legit; I postpone that to "run time"
+ * A "-" representation of "close me" shows up as a -3 here */
+ debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
+ } else {
+ /* We do _not_ try to open the file that src points to,
+ * since we need to return and let src be expanded first.
+ * Set ctx->pending_redirect, so we know what to do at the
+ * end of the next parsed word. */
+ ctx->pending_redirect = redir;
+ }
+ return 0;
+}
+
+static struct pipe *new_pipe(void)
+{
+ struct pipe *pi;
+ pi = xzalloc(sizeof(struct pipe));
+ /*pi->num_progs = 0;*/
+ /*pi->progs = NULL;*/
+ /*pi->next = NULL;*/
+ /*pi->followup = 0; invalid */
+ if (RES_NONE)
+ pi->res_word = RES_NONE;
+ return pi;
+}
+
+static void initialize_context(struct p_context *ctx)
+{
+ ctx->child = NULL;
+ ctx->pipe = ctx->list_head = new_pipe();
+ ctx->pending_redirect = NULL;
+ ctx->res_w = RES_NONE;
+ //only ctx->parse_type is not touched... is this intentional?
+ ctx->old_flag = 0;
+ ctx->stack = NULL;
+ done_command(ctx); /* creates the memory for working child */
+}
+
+/* normal return is 0
+ * if a reserved word is found, and processed, return 1
+ * should handle if, then, elif, else, fi, for, while, until, do, done.
+ * case, function, and select are obnoxious, save those for later.
+ */
+#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS
+static int reserved_word(o_string *dest, struct p_context *ctx)
+{
+ struct reserved_combo {
+ char literal[7];
+ unsigned char code;
+ int flag;
+ };
+ /* Mostly a list of accepted follow-up reserved words.
+ * FLAG_END means we are done with the sequence, and are ready
+ * to turn the compound list into a command.
+ * FLAG_START means the word must start a new compound list.
+ */
+ static const struct reserved_combo reserved_list[] = {
+#if ENABLE_HUSH_IF
+ { "if", RES_IF, FLAG_THEN | FLAG_START },
+ { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
+ { "elif", RES_ELIF, FLAG_THEN },
+ { "else", RES_ELSE, FLAG_FI },
+ { "fi", RES_FI, FLAG_END },
+#endif
+#if ENABLE_HUSH_LOOPS
+ { "for", RES_FOR, FLAG_IN | FLAG_START },
+ { "while", RES_WHILE, FLAG_DO | FLAG_START },
+ { "until", RES_UNTIL, FLAG_DO | FLAG_START },
+ { "in", RES_IN, FLAG_DO },
+ { "do", RES_DO, FLAG_DONE },
+ { "done", RES_DONE, FLAG_END }
+#endif
+ };
+
+ const struct reserved_combo *r;
+
+ for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
+ if (strcmp(dest->data, r->literal) != 0)
+ continue;
+ debug_printf("found reserved word %s, code %d\n", r->literal, r->code);
+ if (r->flag & FLAG_START) {
+ struct p_context *new;
+ debug_printf("push stack\n");
+#if ENABLE_HUSH_LOOPS
+ if (ctx->res_w == RES_IN || ctx->res_w == RES_FOR) {
+ syntax("malformed for"); /* example: 'for if' */
+ ctx->res_w = RES_SNTX;
+ b_reset(dest);
+ return 1;
+ }
+#endif
+ new = xmalloc(sizeof(*new));
+ *new = *ctx; /* physical copy */
+ initialize_context(ctx);
+ ctx->stack = new;
+ } else if (ctx->res_w == RES_NONE || !(ctx->old_flag & (1 << r->code))) {
+ syntax(NULL);
+ ctx->res_w = RES_SNTX;
+ b_reset(dest);
+ return 1;
+ }
+ ctx->res_w = r->code;
+ ctx->old_flag = r->flag;
+ if (ctx->old_flag & FLAG_END) {
+ struct p_context *old;
+ debug_printf("pop stack\n");
+ done_pipe(ctx, PIPE_SEQ);
+ old = ctx->stack;
+ old->child->group = ctx->list_head;
+ old->child->subshell = 0;
+ *ctx = *old; /* physical copy */
+ free(old);
+ }
+ b_reset(dest);
+ return 1;
+ }
+ return 0;
+}
+#else
+#define reserved_word(dest, ctx) ((int)0)
+#endif
+
+/* Normal return is 0.
+ * Syntax or xglob errors return 1. */
+static int done_word(o_string *dest, struct p_context *ctx)
+{
+ struct child_prog *child = ctx->child;
+ char ***glob_target;
+ int gr;
+
+ debug_printf_parse("done_word entered: '%s' %p\n", dest->data, child);
+ if (dest->length == 0 && !dest->nonnull) {
+ debug_printf_parse("done_word return 0: true null, ignored\n");
+ return 0;
+ }
+ if (ctx->pending_redirect) {
+ glob_target = &ctx->pending_redirect->glob_word;
+ } else {
+ if (child->group) {
+ syntax(NULL);
+ debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
+ return 1;
+ }
+ if (!child->argv && (ctx->parse_type & PARSEFLAG_SEMICOLON)) {
+ debug_printf_parse(": checking '%s' for reserved-ness\n", dest->data);
+ if (reserved_word(dest, ctx)) {
+ debug_printf_parse("done_word return %d\n", (ctx->res_w == RES_SNTX));
+ return (ctx->res_w == RES_SNTX);
+ }
+ }
+ glob_target = &child->argv;
+ }
+ gr = xglob(dest, glob_target);
+ if (gr != 0) {
+ debug_printf_parse("done_word return 1: xglob returned %d\n", gr);
+ return 1;
+ }
+
+ b_reset(dest);
+ if (ctx->pending_redirect) {
+ /* NB: don't free_strings(ctx->pending_redirect->glob_word) here */
+ if (ctx->pending_redirect->glob_word
+ && ctx->pending_redirect->glob_word[0]
+ && ctx->pending_redirect->glob_word[1]
+ ) {
+ /* more than one word resulted from globbing redir */
+ ctx->pending_redirect = NULL;
+ bb_error_msg("ambiguous redirect");
+ debug_printf_parse("done_word return 1: ambiguous redirect\n");
+ return 1;
+ }
+ ctx->pending_redirect = NULL;
+ }
+#if ENABLE_HUSH_LOOPS
+ if (ctx->res_w == RES_FOR) {
+ done_word(dest, ctx);
+ done_pipe(ctx, PIPE_SEQ);
+ }
+#endif
+ debug_printf_parse("done_word return 0\n");
+ return 0;
+}
+
+/* The only possible error here is out of memory, in which case
+ * xmalloc exits. */
+static int done_command(struct p_context *ctx)
+{
+ /* The child is really already in the pipe structure, so
+ * advance the pipe counter and make a new, null child. */
+ struct pipe *pi = ctx->pipe;
+ struct child_prog *child = ctx->child;
+
+ if (child) {
+ if (child->group == NULL
+ && child->argv == NULL
+ && child->redirects == NULL
+ ) {
+ debug_printf_parse("done_command: skipping null cmd, num_progs=%d\n", pi->num_progs);
+ return pi->num_progs;
+ }
+ pi->num_progs++;
+ debug_printf_parse("done_command: ++num_progs=%d\n", pi->num_progs);
+ } else {
+ debug_printf_parse("done_command: initializing, num_progs=%d\n", pi->num_progs);
+ }
+
+ /* Only real trickiness here is that the uncommitted
+ * child structure is not counted in pi->num_progs. */
+ pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
+ child = &pi->progs[pi->num_progs];
+
+ memset(child, 0, sizeof(*child));
+ /*child->redirects = NULL;*/
+ /*child->argv = NULL;*/
+ /*child->is_stopped = 0;*/
+ /*child->group = NULL;*/
+ child->family = pi;
+ //sp: /*child->sp = 0;*/
+ //pt: child->parse_type = ctx->parse_type;
+
+ ctx->child = child;
+ /* but ctx->pipe and ctx->list_head remain unchanged */
+
+ return pi->num_progs; /* used only for 0/nonzero check */
+}
+
+static int done_pipe(struct p_context *ctx, pipe_style type)
+{
+ struct pipe *new_p;
+ int not_null;
+
+ debug_printf_parse("done_pipe entered, followup %d\n", type);
+ not_null = done_command(ctx); /* implicit closure of previous command */
+ ctx->pipe->followup = type;
+ ctx->pipe->res_word = ctx->res_w;
+ /* Without this check, even just <enter> on command line generates
+ * tree of three NOPs (!). Which is harmless but annoying.
+ * IOW: it is safe to do it unconditionally. */
+ if (not_null) {
+ new_p = new_pipe();
+ ctx->pipe->next = new_p;
+ ctx->pipe = new_p;
+ ctx->child = NULL;
+ done_command(ctx); /* set up new pipe to accept commands */
+ }
+ debug_printf_parse("done_pipe return 0\n");
+ return 0;
+}
+
+/* peek ahead in the in_str to find out if we have a "&n" construct,
+ * as in "2>&1", that represents duplicating a file descriptor.
+ * returns either -2 (syntax error), -1 (no &), or the number found.
+ */
+static int redirect_dup_num(struct in_str *input)
+{
+ int ch, d = 0, ok = 0;
+ ch = b_peek(input);
+ if (ch != '&') return -1;
+
+ b_getch(input); /* get the & */
+ ch = b_peek(input);
+ if (ch == '-') {
+ b_getch(input);
+ return -3; /* "-" represents "close me" */
+ }
+ while (isdigit(ch)) {
+ d = d*10 + (ch-'0');
+ ok = 1;
+ b_getch(input);
+ ch = b_peek(input);
+ }
+ if (ok) return d;
+
+ bb_error_msg("ambiguous redirect");
+ return -2;
+}
+
+/* If a redirect is immediately preceded by a number, that number is
+ * supposed to tell which file descriptor to redirect. This routine
+ * looks for such preceding numbers. In an ideal world this routine
+ * needs to handle all the following classes of redirects...
+ * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
+ * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
+ * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
+ * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
+ * A -1 output from this program means no valid number was found, so the
+ * caller should use the appropriate default for this redirection.
+ */
+static int redirect_opt_num(o_string *o)
+{
+ int num;
+
+ if (o->length == 0)
+ return -1;
+ for (num = 0; num < o->length; num++) {
+ if (!isdigit(*(o->data + num))) {
+ return -1;
+ }
+ }
+ /* reuse num (and save an int) */
+ num = atoi(o->data);
+ b_reset(o);
+ return num;
+}
+
+#if ENABLE_HUSH_TICK
+/* NB: currently disabled on NOMMU */
+static FILE *generate_stream_from_list(struct pipe *head)
+{
+ FILE *pf;
+ int pid, channel[2];
+
+ xpipe(channel);
+/* *** NOMMU WARNING *** */
+/* By using vfork here, we suspend parent till child exits or execs.
+ * If child will not do it before it fills the pipe, it can block forever
+ * in write(STDOUT_FILENO), and parent (shell) will be also stuck.
+ */
+ pid = BB_MMU ? fork() : vfork();
+ if (pid < 0)
+ bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
+ if (pid == 0) { /* child */
+ if (ENABLE_HUSH_JOB)
+ die_sleep = 0; /* let nofork's xfuncs die */
+ close(channel[0]); /* NB: close _first_, then move fd! */
+ xmove_fd(channel[1], 1);
+ /* Prevent it from trying to handle ctrl-z etc */
+#if ENABLE_HUSH_JOB
+ run_list_level = 1;
+#endif
+ /* Process substitution is not considered to be usual
+ * 'command execution'.
+ * SUSv3 says ctrl-Z should be ignored, ctrl-C should not. */
+ /* Not needed, we are relying on it being disabled
+ * everywhere outside actual command execution. */
+ /*set_jobctrl_sighandler(SIG_IGN);*/
+ set_misc_sighandler(SIG_DFL);
+ /* Freeing 'head' here would break NOMMU. */
+ _exit(run_list(head));
+ }
+ close(channel[1]);
+ pf = fdopen(channel[0], "r");
+ return pf;
+ /* 'head' is freed by the caller */
+}
+
+/* Return code is exit status of the process that is run. */
+static int process_command_subs(o_string *dest,
+ /*struct p_context *ctx,*/
+ struct in_str *input,
+ const char *subst_end)
+{
+ int retcode, ch, eol_cnt;
+ o_string result = NULL_O_STRING;
+ struct p_context inner;
+ FILE *p;
+ struct in_str pipe_str;
+
+ initialize_context(&inner);
+
+ /* recursion to generate command */
+ retcode = parse_stream(&result, &inner, input, subst_end);
+ if (retcode != 0)
+ return retcode; /* syntax error or EOF */
+ done_word(&result, &inner);
+ done_pipe(&inner, PIPE_SEQ);
+ b_free(&result);
+
+ p = generate_stream_from_list(inner.list_head);
+ if (p == NULL)
+ return 1;
+ close_on_exec_on(fileno(p));
+ setup_file_in_str(&pipe_str, p);
+
+ /* now send results of command back into original context */
+ eol_cnt = 0;
+ while ((ch = b_getch(&pipe_str)) != EOF) {
+ if (ch == '\n') {
+ eol_cnt++;
+ continue;
+ }
+ while (eol_cnt) {
+ b_addqchr(dest, '\n', dest->o_quote);
+ eol_cnt--;
+ }
+ b_addqchr(dest, ch, dest->o_quote);
+ }
+
+ debug_printf("done reading from pipe, pclose()ing\n");
+ /* This is the step that wait()s for the child. Should be pretty
+ * safe, since we just read an EOF from its stdout. We could try
+ * to do better, by using wait(), and keeping track of background jobs
+ * at the same time. That would be a lot of work, and contrary
+ * to the KISS philosophy of this program. */
+ retcode = fclose(p);
+ free_pipe_list(inner.list_head, /* indent: */ 0);
+ debug_printf("closed FILE from child, retcode=%d\n", retcode);
+ return retcode;
+}
+#endif
+
+static int parse_group(o_string *dest, struct p_context *ctx,
+ struct in_str *input, int ch)
+{
+ int rcode;
+ const char *endch = NULL;
+ struct p_context sub;
+ struct child_prog *child = ctx->child;
+
+ debug_printf_parse("parse_group entered\n");
+ if (child->argv) {
+ syntax(NULL);
+ debug_printf_parse("parse_group return 1: syntax error, groups and arglists don't mix\n");
+ return 1;
+ }
+ initialize_context(&sub);
+ endch = "}";
+ if (ch == '(') {
+ endch = ")";
+ child->subshell = 1;
+ }
+ rcode = parse_stream(dest, &sub, input, endch);
+//vda: err chk?
+ done_word(dest, &sub); /* finish off the final word in the subcontext */
+ done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
+ child->group = sub.list_head;
+
+ debug_printf_parse("parse_group return %d\n", rcode);
+ return rcode;
+ /* child remains "open", available for possible redirects */
+}
+
+/* Basically useful version until someone wants to get fancier,
+ * see the bash man page under "Parameter Expansion" */
+static const char *lookup_param(const char *src)
+{
+ struct variable *var = get_local_var(src);
+ if (var)
+ return strchr(var->varstr, '=') + 1;
+ return NULL;
+}
+
+/* return code: 0 for OK, 1 for syntax error */
+static int handle_dollar(o_string *dest, /*struct p_context *ctx,*/ struct in_str *input)
+{
+ int ch = b_peek(input); /* first character after the $ */
+ unsigned char quote_mask = dest->o_quote ? 0x80 : 0;
+
+ debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
+ if (isalpha(ch)) {
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ //sp: ctx->child->sp++;
+ while (1) {
+ debug_printf_parse(": '%c'\n", ch);
+ b_getch(input);
+ b_addchr(dest, ch | quote_mask);
+ quote_mask = 0;
+ ch = b_peek(input);
+ if (!isalnum(ch) && ch != '_')
+ break;
+ }
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ } else if (isdigit(ch)) {
+ make_one_char_var:
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ //sp: ctx->child->sp++;
+ debug_printf_parse(": '%c'\n", ch);
+ b_getch(input);
+ b_addchr(dest, ch | quote_mask);
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ } else switch (ch) {
+ case '$': /* pid */
+ case '!': /* last bg pid */
+ case '?': /* last exit code */
+ case '#': /* number of args */
+ case '*': /* args */
+ case '@': /* args */
+ goto make_one_char_var;
+ case '{':
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ //sp: ctx->child->sp++;
+ b_getch(input);
+ /* XXX maybe someone will try to escape the '}' */
+ while (1) {
+ ch = b_getch(input);
+ if (ch == '}')
+ break;
+ if (!isalnum(ch) && ch != '_') {
+ syntax("unterminated ${name}");
+ debug_printf_parse("handle_dollar return 1: unterminated ${name}\n");
+ return 1;
+ }
+ debug_printf_parse(": '%c'\n", ch);
+ b_addchr(dest, ch | quote_mask);
+ quote_mask = 0;
+ }
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ break;
+#if ENABLE_HUSH_TICK
+ case '(':
+ b_getch(input);
+ process_command_subs(dest, /*ctx,*/ input, ")");
+ break;
+#endif
+ case '-':
+ case '_':
+ /* still unhandled, but should be eventually */
+ bb_error_msg("unhandled syntax: $%c", ch);
+ return 1;
+ break;
+ default:
+ b_addqchr(dest, '$', dest->o_quote);
+ }
+ debug_printf_parse("handle_dollar return 0\n");
+ return 0;
+}
+
+/* return code is 0 for normal exit, 1 for syntax error */
+static int parse_stream(o_string *dest, struct p_context *ctx,
+ struct in_str *input, const char *end_trigger)
+{
+ int ch, m;
+ int redir_fd;
+ redir_type redir_style;
+ int next;
+
+ /* Only double-quote state is handled in the state variable dest->o_quote.
+ * A single-quote triggers a bypass of the main loop until its mate is
+ * found. When recursing, quote state is passed in via dest->o_quote. */
+
+ debug_printf_parse("parse_stream entered, end_trigger='%s'\n", end_trigger);
+
+ while (1) {
+ m = CHAR_IFS;
+ next = '\0';
+ ch = b_getch(input);
+ if (ch != EOF) {
+ m = charmap[ch];
+ if (ch != '\n')
+ next = b_peek(input);
+ }
+ debug_printf_parse(": ch=%c (%d) m=%d quote=%d\n",
+ ch, ch, m, dest->o_quote);
+ if (m == CHAR_ORDINARY
+ || (m != CHAR_SPECIAL && dest->o_quote)
+ ) {
+ if (ch == EOF) {
+ syntax("unterminated \"");
+ debug_printf_parse("parse_stream return 1: unterminated \"\n");
+ return 1;
+ }
+ b_addqchr(dest, ch, dest->o_quote);
+ continue;
+ }
+ if (m == CHAR_IFS) {
+ if (done_word(dest, ctx)) {
+ debug_printf_parse("parse_stream return 1: done_word!=0\n");
+ return 1;
+ }
+ if (ch == EOF)
+ break;
+ /* If we aren't performing a substitution, treat
+ * a newline as a command separator.
+ * [why we don't handle it exactly like ';'? --vda] */
+ if (end_trigger && ch == '\n') {
+ done_pipe(ctx, PIPE_SEQ);
+ }
+ }
+ if ((end_trigger && strchr(end_trigger, ch))
+ && !dest->o_quote && ctx->res_w == RES_NONE
+ ) {
+ debug_printf_parse("parse_stream return 0: end_trigger char found\n");
+ return 0;
+ }
+ if (m == CHAR_IFS)
+ continue;
+ switch (ch) {
+ case '#':
+ if (dest->length == 0 && !dest->o_quote) {
+ while (1) {
+ ch = b_peek(input);
+ if (ch == EOF || ch == '\n')
+ break;
+ b_getch(input);
+ }
+ } else {
+ b_addqchr(dest, ch, dest->o_quote);
+ }
+ break;
+ case '\\':
+ if (next == EOF) {
+ syntax("\\<eof>");
+ debug_printf_parse("parse_stream return 1: \\<eof>\n");
+ return 1;
+ }
+ b_addqchr(dest, '\\', dest->o_quote);
+ b_addqchr(dest, b_getch(input), dest->o_quote);
+ break;
+ case '$':
+ if (handle_dollar(dest, /*ctx,*/ input) != 0) {
+ debug_printf_parse("parse_stream return 1: handle_dollar returned non-0\n");
+ return 1;
+ }
+ break;
+ case '\'':
+ dest->nonnull = 1;
+ while (1) {
+ ch = b_getch(input);
+ if (ch == EOF || ch == '\'')
+ break;
+ b_addchr(dest, ch);
+ }
+ if (ch == EOF) {
+ syntax("unterminated '");
+ debug_printf_parse("parse_stream return 1: unterminated '\n");
+ return 1;
+ }
+ break;
+ case '"':
+ dest->nonnull = 1;
+ dest->o_quote ^= 1; /* invert */
+ break;
+#if ENABLE_HUSH_TICK
+ case '`':
+ process_command_subs(dest, /*ctx,*/ input, "`");
+ break;
+#endif
+ case '>':
+ redir_fd = redirect_opt_num(dest);
+ done_word(dest, ctx);
+ redir_style = REDIRECT_OVERWRITE;
+ if (next == '>') {
+ redir_style = REDIRECT_APPEND;
+ b_getch(input);
+ }
+#if 0
+ else if (next == '(') {
+ syntax(">(process) not supported");
+ debug_printf_parse("parse_stream return 1: >(process) not supported\n");
+ return 1;
+ }
+#endif
+ setup_redirect(ctx, redir_fd, redir_style, input);
+ break;
+ case '<':
+ redir_fd = redirect_opt_num(dest);
+ done_word(dest, ctx);
+ redir_style = REDIRECT_INPUT;
+ if (next == '<') {
+ redir_style = REDIRECT_HEREIS;
+ b_getch(input);
+ } else if (next == '>') {
+ redir_style = REDIRECT_IO;
+ b_getch(input);
+ }
+#if 0
+ else if (next == '(') {
+ syntax("<(process) not supported");
+ debug_printf_parse("parse_stream return 1: <(process) not supported\n");
+ return 1;
+ }
+#endif
+ setup_redirect(ctx, redir_fd, redir_style, input);
+ break;
+ case ';':
+ done_word(dest, ctx);
+ done_pipe(ctx, PIPE_SEQ);
+ break;
+ case '&':
+ done_word(dest, ctx);
+ if (next == '&') {
+ b_getch(input);
+ done_pipe(ctx, PIPE_AND);
+ } else {
+ done_pipe(ctx, PIPE_BG);
+ }
+ break;
+ case '|':
+ done_word(dest, ctx);
+ if (next == '|') {
+ b_getch(input);
+ done_pipe(ctx, PIPE_OR);
+ } else {
+ /* we could pick up a file descriptor choice here
+ * with redirect_opt_num(), but bash doesn't do it.
+ * "echo foo 2| cat" yields "foo 2". */
+ done_command(ctx);
+ }
+ break;
+ case '(':
+ case '{':
+ if (parse_group(dest, ctx, input, ch) != 0) {
+ debug_printf_parse("parse_stream return 1: parse_group returned non-0\n");
+ return 1;
+ }
+ break;
+ case ')':
+ case '}':
+ syntax("unexpected }"); /* Proper use of this character is caught by end_trigger */
+ debug_printf_parse("parse_stream return 1: unexpected '}'\n");
+ return 1;
+ default:
+ if (ENABLE_HUSH_DEBUG)
+ bb_error_msg_and_die("BUG: unexpected %c\n", ch);
+ }
+ }
+ /* Complain if quote? No, maybe we just finished a command substitution
+ * that was quoted. Example:
+ * $ echo "`cat foo` plus more"
+ * and we just got the EOF generated by the subshell that ran "cat foo"
+ * The only real complaint is if we got an EOF when end_trigger != NULL,
+ * that is, we were really supposed to get end_trigger, and never got
+ * one before the EOF. Can't use the standard "syntax error" return code,
+ * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
+ debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL));
+ if (end_trigger)
+ return -1;
+ return 0;
+}
+
+static void set_in_charmap(const char *set, int code)
+{
+ while (*set)
+ charmap[(unsigned char)*set++] = code;
+}
+
+static void update_charmap(void)
+{
+ /* char *ifs and char charmap[256] are both globals. */
+ ifs = getenv("IFS");
+ if (ifs == NULL)
+ ifs = " \t\n";
+ /* Precompute a list of 'flow through' behavior so it can be treated
+ * quickly up front. Computation is necessary because of IFS.
+ * Special case handling of IFS == " \t\n" is not implemented.
+ * The charmap[] array only really needs two bits each,
+ * and on most machines that would be faster (reduced L1 cache use).
+ */
+ memset(charmap, CHAR_ORDINARY, sizeof(charmap));
+#if ENABLE_HUSH_TICK
+ set_in_charmap("\\$\"`", CHAR_SPECIAL);
+#else
+ set_in_charmap("\\$\"", CHAR_SPECIAL);
+#endif
+ set_in_charmap("<>;&|(){}#'", CHAR_ORDINARY_IF_QUOTED);
+ set_in_charmap(ifs, CHAR_IFS); /* are ordinary if quoted */
+}
+
+/* most recursion does not come through here, the exception is
+ * from builtin_source() and builtin_eval() */
+static int parse_and_run_stream(struct in_str *inp, int parse_flag)
+{
+ struct p_context ctx;
+ o_string temp = NULL_O_STRING;
+ int rcode;
+ do {
+ ctx.parse_type = parse_flag;
+ initialize_context(&ctx);
+ update_charmap();
+ if (!(parse_flag & PARSEFLAG_SEMICOLON) || (parse_flag & PARSEFLAG_REPARSING))
+ set_in_charmap(";$&|", CHAR_ORDINARY);
+#if ENABLE_HUSH_INTERACTIVE
+ inp->promptmode = 0; /* PS1 */
+#endif
+ /* We will stop & execute after each ';' or '\n'.
+ * Example: "sleep 9999; echo TEST" + ctrl-C:
+ * TEST should be printed */
+ rcode = parse_stream(&temp, &ctx, inp, ";\n");
+ if (rcode != 1 && ctx.old_flag != 0) {
+ syntax(NULL);
+ }
+ if (rcode != 1 && ctx.old_flag == 0) {
+ done_word(&temp, &ctx);
+ done_pipe(&ctx, PIPE_SEQ);
+ debug_print_tree(ctx.list_head, 0);
+ debug_printf_exec("parse_stream_outer: run_and_free_list\n");
+ run_and_free_list(ctx.list_head);
+ } else {
+ if (ctx.old_flag != 0) {
+ free(ctx.stack);
+ b_reset(&temp);
+ }
+ temp.nonnull = 0;
+ temp.o_quote = 0;
+ inp->p = NULL;
+ free_pipe_list(ctx.list_head, /* indent: */ 0);
+ }
+ b_free(&temp);
+ } while (rcode != -1 && !(parse_flag & PARSEFLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
+ return 0;
+}
+
+static int parse_and_run_string(const char *s, int parse_flag)
+{
+ struct in_str input;
+ setup_string_in_str(&input, s);
+ return parse_and_run_stream(&input, parse_flag);
+}
+
+static int parse_and_run_file(FILE *f)
+{
+ int rcode;
+ struct in_str input;
+ setup_file_in_str(&input, f);
+ rcode = parse_and_run_stream(&input, PARSEFLAG_SEMICOLON);
+ return rcode;
+}
+
+#if ENABLE_HUSH_JOB
+/* Make sure we have a controlling tty. If we get started under a job
+ * aware app (like bash for example), make sure we are now in charge so
+ * we don't fight over who gets the foreground */
+static void setup_job_control(void)
+{
+ pid_t shell_pgrp;
+
+ saved_task_pgrp = shell_pgrp = getpgrp();
+ debug_printf_jobs("saved_task_pgrp=%d\n", saved_task_pgrp);
+ close_on_exec_on(interactive_fd);
+
+ /* If we were ran as 'hush &',
+ * sleep until we are in the foreground. */
+ while (tcgetpgrp(interactive_fd) != shell_pgrp) {
+ /* Send TTIN to ourself (should stop us) */
+ kill(- shell_pgrp, SIGTTIN);
+ shell_pgrp = getpgrp();
+ }
+
+ /* Ignore job-control and misc signals. */
+ set_jobctrl_sighandler(SIG_IGN);
+ set_misc_sighandler(SIG_IGN);
+//huh? signal(SIGCHLD, SIG_IGN);
+
+ /* We _must_ restore tty pgrp on fatal signals */
+ set_fatal_sighandler(sigexit);
+
+ /* Put ourselves in our own process group. */
+ setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
+ /* Grab control of the terminal. */
+ tcsetpgrp(interactive_fd, getpid());
+}
+#endif
+
+int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int hush_main(int argc, char **argv)
+{
+ static const char version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
+ static const struct variable const_shell_ver = {
+ .next = NULL,
+ .varstr = (char*)version_str,
+ .max_len = 1, /* 0 can provoke free(name) */
+ .flg_export = 1,
+ .flg_read_only = 1,
+ };
+
+ int opt;
+ FILE *input;
+ char **e;
+ struct variable *cur_var;
+
+ INIT_G();
+
+ /* Deal with HUSH_VERSION */
+ shell_ver = const_shell_ver; /* copying struct here */
+ top_var = &shell_ver;
+ unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
+ /* Initialize our shell local variables with the values
+ * currently living in the environment */
+ cur_var = top_var;
+ e = environ;
+ if (e) while (*e) {
+ char *value = strchr(*e, '=');
+ if (value) { /* paranoia */
+ cur_var->next = xzalloc(sizeof(*cur_var));
+ cur_var = cur_var->next;
+ cur_var->varstr = *e;
+ cur_var->max_len = strlen(*e);
+ cur_var->flg_export = 1;
+ }
+ e++;
+ }
+ putenv((char *)version_str); /* reinstate HUSH_VERSION */
+
+#if ENABLE_FEATURE_EDITING
+ line_input_state = new_line_input_t(FOR_SHELL);
+#endif
+ /* XXX what should these be while sourcing /etc/profile? */
+ global_argc = argc;
+ global_argv = argv;
+ /* Initialize some more globals to non-zero values */
+ set_cwd();
+#if ENABLE_HUSH_INTERACTIVE
+#if ENABLE_FEATURE_EDITING
+ cmdedit_set_initial_prompt();
+#endif
+ PS2 = "> ";
+#endif
+
+ if (EXIT_SUCCESS) /* otherwise is already done */
+ last_return_code = EXIT_SUCCESS;
+
+ if (argv[0] && argv[0][0] == '-') {
+ debug_printf("sourcing /etc/profile\n");
+ input = fopen("/etc/profile", "r");
+ if (input != NULL) {
+ close_on_exec_on(fileno(input));
+ parse_and_run_file(input);
+ fclose(input);
+ }
+ }
+ input = stdin;
+
+ while ((opt = getopt(argc, argv, "c:xif")) > 0) {
+ switch (opt) {
+ case 'c':
+ global_argv = argv + optind;
+ global_argc = argc - optind;
+ opt = parse_and_run_string(optarg, PARSEFLAG_SEMICOLON);
+ goto final_return;
+ case 'i':
+ /* Well, we cannot just declare interactiveness,
+ * we have to have some stuff (ctty, etc) */
+ /* interactive_fd++; */
+ break;
+ case 'f':
+ fake_mode = 1;
+ break;
+ default:
+#ifndef BB_VER
+ fprintf(stderr, "Usage: sh [FILE]...\n"
+ " or: sh -c command [args]...\n\n");
+ exit(EXIT_FAILURE);
+#else
+ bb_show_usage();
+#endif
+ }
+ }
+#if ENABLE_HUSH_JOB
+ /* A shell is interactive if the '-i' flag was given, or if all of
+ * the following conditions are met:
+ * no -c command
+ * no arguments remaining or the -s flag given
+ * standard input is a terminal
+ * standard output is a terminal
+ * Refer to Posix.2, the description of the 'sh' utility. */
+ if (argv[optind] == NULL && input == stdin
+ && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
+ ) {
+ saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
+ debug_printf("saved_tty_pgrp=%d\n", saved_tty_pgrp);
+ if (saved_tty_pgrp >= 0) {
+ /* try to dup to high fd#, >= 255 */
+ interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
+ if (interactive_fd < 0) {
+ /* try to dup to any fd */
+ interactive_fd = dup(STDIN_FILENO);
+ if (interactive_fd < 0)
+ /* give up */
+ interactive_fd = 0;
+ }
+ // TODO: track & disallow any attempts of user
+ // to (inadvertently) close/redirect it
+ }
+ }
+ debug_printf("interactive_fd=%d\n", interactive_fd);
+ if (interactive_fd) {
+ fcntl(interactive_fd, F_SETFD, FD_CLOEXEC);
+ /* Looks like they want an interactive shell */
+ setup_job_control();
+ /* -1 is special - makes xfuncs longjmp, not exit
+ * (we reset die_sleep = 0 whereever we [v]fork) */
+ die_sleep = -1;
+ if (setjmp(die_jmp)) {
+ /* xfunc has failed! die die die */
+ hush_exit(xfunc_error_retval);
+ }
+#if !ENABLE_FEATURE_SH_EXTRA_QUIET
+ printf("\n\n%s hush - the humble shell v"HUSH_VER_STR"\n", bb_banner);
+ printf("Enter 'help' for a list of built-in commands.\n\n");
+#endif
+ }
+#elif ENABLE_HUSH_INTERACTIVE
+/* no job control compiled, only prompt/line editing */
+ if (argv[optind] == NULL && input == stdin
+ && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
+ ) {
+ interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
+ if (interactive_fd < 0) {
+ /* try to dup to any fd */
+ interactive_fd = dup(STDIN_FILENO);
+ if (interactive_fd < 0)
+ /* give up */
+ interactive_fd = 0;
+ }
+ if (interactive_fd)
+ fcntl(interactive_fd, F_SETFD, FD_CLOEXEC);
+ }
+#endif
+
+ if (argv[optind] == NULL) {
+ opt = parse_and_run_file(stdin);
+ } else {
+ debug_printf("\nrunning script '%s'\n", argv[optind]);
+ global_argv = argv + optind;
+ global_argc = argc - optind;
+ input = xfopen(argv[optind], "r");
+ fcntl(fileno(input), F_SETFD, FD_CLOEXEC);
+ opt = parse_and_run_file(input);
+ }
+
+ final_return:
+
+#if ENABLE_FEATURE_CLEAN_UP
+ fclose(input);
+ if (cwd != bb_msg_unknown)
+ free((char*)cwd);
+ cur_var = top_var->next;
+ while (cur_var) {
+ struct variable *tmp = cur_var;
+ if (!cur_var->max_len)
+ free(cur_var->varstr);
+ cur_var = cur_var->next;
+ free(tmp);
+ }
+#endif
+ hush_exit(opt ? opt : last_return_code);
+}
+
+
+#if ENABLE_LASH
+int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int lash_main(int argc, char **argv)
+{
+ //bb_error_msg("lash is deprecated, please use hush instead");
+ return hush_main(argc, argv);
+}
+#endif