From 5e1a84ab74d5e97582427f016f291a8c11e66f99 Mon Sep 17 00:00:00 2001 From: jutteau Date: Fri, 11 May 2007 18:10:19 +0000 Subject: Completion du script de mise à jour de la pc-104 : * Ajout des sources de busybox dans ./conf/busybox/ * Ajout d'un fichier réclamé par les script dans ./conf/busybox.links --- i/pc104/initrd/conf/busybox/networking/ifupdown.c | 1273 +++++++++++++++++++++ 1 file changed, 1273 insertions(+) create mode 100644 i/pc104/initrd/conf/busybox/networking/ifupdown.c (limited to 'i/pc104/initrd/conf/busybox/networking/ifupdown.c') diff --git a/i/pc104/initrd/conf/busybox/networking/ifupdown.c b/i/pc104/initrd/conf/busybox/networking/ifupdown.c new file mode 100644 index 0000000..887c2ee --- /dev/null +++ b/i/pc104/initrd/conf/busybox/networking/ifupdown.c @@ -0,0 +1,1273 @@ +/* vi: set sw=4 ts=4: */ +/* + * ifupdown for busybox + * Copyright (c) 2002 Glenn McGrath + * Copyright (c) 2003-2004 Erik Andersen + * + * Based on ifupdown v 0.6.4 by Anthony Towns + * Copyright (c) 1999 Anthony Towns + * + * Changes to upstream version + * Remove checks for kernel version, assume kernel version 2.2.0 or better. + * Lines in the interfaces file cannot wrap. + * To adhere to the FHS, the default state file is /var/run/ifstate. + * + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. + */ + +#include "busybox.h" +#include +#include +#include + +#define MAX_OPT_DEPTH 10 +#define EUNBALBRACK 10001 +#define EUNDEFVAR 10002 +#define EUNBALPER 10000 + +#if ENABLE_FEATURE_IFUPDOWN_MAPPING +#define MAX_INTERFACE_LENGTH 10 +#endif + +#define debug_noise(args...) /*fprintf(stderr, args)*/ + +/* Forward declaration */ +struct interface_defn_t; + +typedef int execfn(char *command); + +struct method_t { + const char *name; + int (*up)(struct interface_defn_t *ifd, execfn *e); + int (*down)(struct interface_defn_t *ifd, execfn *e); +}; + +struct address_family_t { + const char *name; + int n_methods; + const struct method_t *method; +}; + +struct mapping_defn_t { + struct mapping_defn_t *next; + + int max_matches; + int n_matches; + char **match; + + char *script; + + int max_mappings; + int n_mappings; + char **mapping; +}; + +struct variable_t { + char *name; + char *value; +}; + +struct interface_defn_t { + const struct address_family_t *address_family; + const struct method_t *method; + + char *iface; + int max_options; + int n_options; + struct variable_t *option; +}; + +struct interfaces_file_t { + llist_t *autointerfaces; + llist_t *ifaces; + struct mapping_defn_t *mappings; +}; + +#define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:" +enum { + OPT_do_all = 0x1, + OPT_no_act = 0x2, + OPT_verbose = 0x4, + OPT_force = 0x8, + OPT_no_mappings = 0x10, +}; +#define DO_ALL (option_mask32 & OPT_do_all) +#define NO_ACT (option_mask32 & OPT_no_act) +#define VERBOSE (option_mask32 & OPT_verbose) +#define FORCE (option_mask32 & OPT_force) +#define NO_MAPPINGS (option_mask32 & OPT_no_mappings) + +static char **my_environ; + +static const char *startup_PATH; + +#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6 + +#if ENABLE_FEATURE_IFUPDOWN_IP + +static unsigned count_bits(unsigned a) +{ + unsigned result; + result = (a & 0x55) + ((a >> 1) & 0x55); + result = (result & 0x33) + ((result >> 2) & 0x33); + return (result & 0x0F) + ((result >> 4) & 0x0F); +} + +static int count_netmask_bits(char *dotted_quad) +{ + unsigned result, a, b, c, d; + /* Found a netmask... Check if it is dotted quad */ + if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4) + return -1; + // FIXME: will be confused by e.g. 255.0.255.0 + result = count_bits(a); + result += count_bits(b); + result += count_bits(c); + result += count_bits(d); + return (int)result; +} +#endif + +static void addstr(char **bufp, const char *str, size_t str_length) +{ + /* xasprintf trick will be smaller, but we are often + * called with str_length == 1 - don't want to have + * THAT much of malloc/freeing! */ + char *buf = *bufp; + int len = (buf ? strlen(buf) : 0); + str_length++; + buf = xrealloc(buf, len + str_length); + /* copies at most str_length-1 chars! */ + safe_strncpy(buf + len, str, str_length); + *bufp = buf; +} + +static int strncmpz(const char *l, const char *r, size_t llen) +{ + int i = strncmp(l, r, llen); + + if (i == 0) + return -r[llen]; + return i; +} + +static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd) +{ + int i; + + if (strncmpz(id, "iface", idlen) == 0) { + char *result; + static char label_buf[20]; + safe_strncpy(label_buf, ifd->iface, sizeof(label_buf)); + result = strchr(label_buf, ':'); + if (result) { + *result = '\0'; + } + return label_buf; + } + if (strncmpz(id, "label", idlen) == 0) { + return ifd->iface; + } + for (i = 0; i < ifd->n_options; i++) { + if (strncmpz(id, ifd->option[i].name, idlen) == 0) { + return ifd->option[i].value; + } + } + return NULL; +} + +static char *parse(const char *command, struct interface_defn_t *ifd) +{ + size_t old_pos[MAX_OPT_DEPTH] = { 0 }; + int okay[MAX_OPT_DEPTH] = { 1 }; + int opt_depth = 1; + char *result = NULL; + + while (*command) { + switch (*command) { + default: + addstr(&result, command, 1); + command++; + break; + case '\\': + if (command[1]) { + addstr(&result, command + 1, 1); + command += 2; + } else { + addstr(&result, command, 1); + command++; + } + break; + case '[': + if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) { + old_pos[opt_depth] = result ? strlen(result) : 0; + okay[opt_depth] = 1; + opt_depth++; + command += 2; + } else { + addstr(&result, "[", 1); + command++; + } + break; + case ']': + if (command[1] == ']' && opt_depth > 1) { + opt_depth--; + if (!okay[opt_depth]) { + result[old_pos[opt_depth]] = '\0'; + } + command += 2; + } else { + addstr(&result, "]", 1); + command++; + } + break; + case '%': + { + char *nextpercent; + char *varvalue; + + command++; + nextpercent = strchr(command, '%'); + if (!nextpercent) { + errno = EUNBALPER; + free(result); + return NULL; + } + + varvalue = get_var(command, nextpercent - command, ifd); + + if (varvalue) { + addstr(&result, varvalue, strlen(varvalue)); + } else { +#if ENABLE_FEATURE_IFUPDOWN_IP + /* Sigh... Add a special case for 'ip' to convert from + * dotted quad to bit count style netmasks. */ + if (strncmp(command, "bnmask", 6) == 0) { + unsigned res; + varvalue = get_var("netmask", 7, ifd); + if (varvalue && (res = count_netmask_bits(varvalue)) > 0) { + const char *argument = utoa(res); + addstr(&result, argument, strlen(argument)); + command = nextpercent + 1; + break; + } + } +#endif + okay[opt_depth - 1] = 0; + } + + command = nextpercent + 1; + } + break; + } + } + + if (opt_depth > 1) { + errno = EUNBALBRACK; + free(result); + return NULL; + } + + if (!okay[0]) { + errno = EUNDEFVAR; + free(result); + return NULL; + } + + return result; +} + +/* execute() returns 1 for success and 0 for failure */ +static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec) +{ + char *out; + int ret; + + out = parse(command, ifd); + if (!out) { + /* parse error? */ + return 0; + } + /* out == "": parsed ok but not all needed variables known, skip */ + ret = out[0] ? (*exec)(out) : 1; + + free(out); + if (ret != 1) { + return 0; + } + return 1; +} +#endif + +#if ENABLE_FEATURE_IFUPDOWN_IPV6 +static int loopback_up6(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_FEATURE_IFUPDOWN_IP + int result; + result = execute("ip addr add ::1 dev %iface%", ifd, exec); + result += execute("ip link set %iface% up", ifd, exec); + return ((result == 2) ? 2 : 0); +#else + return execute("ifconfig %iface% add ::1", ifd, exec); +#endif +} + +static int loopback_down6(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_FEATURE_IFUPDOWN_IP + return execute("ip link set %iface% down", ifd, exec); +#else + return execute("ifconfig %iface% del ::1", ifd, exec); +#endif +} + +static int static_up6(struct interface_defn_t *ifd, execfn *exec) +{ + int result; +#if ENABLE_FEATURE_IFUPDOWN_IP + result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec); + result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec); + /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */ + result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec); +#else + result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec); + result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec); + result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec); +#endif + return ((result == 3) ? 3 : 0); +} + +static int static_down6(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_FEATURE_IFUPDOWN_IP + return execute("ip link set %iface% down", ifd, exec); +#else + return execute("ifconfig %iface% down", ifd, exec); +#endif +} + +#if ENABLE_FEATURE_IFUPDOWN_IP +static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec) +{ + int result; + result = execute("ip tunnel add %iface% mode sit remote " + "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec); + result += execute("ip link set %iface% up", ifd, exec); + result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec); + result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec); + return ((result == 4) ? 4 : 0); +} + +static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec) +{ + return execute("ip tunnel del %iface%", ifd, exec); +} +#endif + +static const struct method_t methods6[] = { +#if ENABLE_FEATURE_IFUPDOWN_IP + { "v4tunnel", v4tunnel_up, v4tunnel_down, }, +#endif + { "static", static_up6, static_down6, }, + { "loopback", loopback_up6, loopback_down6, }, +}; + +static const struct address_family_t addr_inet6 = { + "inet6", + sizeof(methods6) / sizeof(struct method_t), + methods6 +}; +#endif /* FEATURE_IFUPDOWN_IPV6 */ + +#if ENABLE_FEATURE_IFUPDOWN_IPV4 +static int loopback_up(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_FEATURE_IFUPDOWN_IP + int result; + result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec); + result += execute("ip link set %iface% up", ifd, exec); + return ((result == 2) ? 2 : 0); +#else + return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec); +#endif +} + +static int loopback_down(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_FEATURE_IFUPDOWN_IP + int result; + result = execute("ip addr flush dev %iface%", ifd, exec); + result += execute("ip link set %iface% down", ifd, exec); + return ((result == 2) ? 2 : 0); +#else + return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec); +#endif +} + +static int static_up(struct interface_defn_t *ifd, execfn *exec) +{ + int result; +#if ENABLE_FEATURE_IFUPDOWN_IP + result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] " + "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec); + result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec); + result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec); + return ((result == 3) ? 3 : 0); +#else + /* ifconfig said to set iface up before it processes hw %hwaddress%, + * which then of course fails. Thus we run two separate ifconfig */ + result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up", + ifd, exec); + result += execute("ifconfig %iface% %address% netmask %netmask%" + "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ", + ifd, exec); + result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec); + return ((result == 3) ? 3 : 0); +#endif +} + +static int static_down(struct interface_defn_t *ifd, execfn *exec) +{ + int result; +#if ENABLE_FEATURE_IFUPDOWN_IP + result = execute("ip addr flush dev %iface%", ifd, exec); + result += execute("ip link set %iface% down", ifd, exec); +#else + result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); + result += execute("ifconfig %iface% down", ifd, exec); +#endif + return ((result == 2) ? 2 : 0); +} + +#if !ENABLE_APP_UDHCPC +struct dhcp_client_t +{ + const char *name; + const char *startcmd; + const char *stopcmd; +}; + +static const struct dhcp_client_t ext_dhcp_clients[] = { + { "udhcpc", + "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]", + "kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", + }, + { "pump", + "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]", + "pump -i %iface% -k", + }, + { "dhclient", + "dhclient -pf /var/run/dhclient.%iface%.pid %iface%", + "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", + }, + { "dhcpcd", + "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%", + "dhcpcd -k %iface%", + }, +}; +#endif + +static int dhcp_up(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_APP_UDHCPC + return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid " + "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]", + ifd, exec); +#else + int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]); + for (i = 0; i < nclients; i++) { + if (exists_execable(ext_dhcp_clients[i].name)) + return execute(ext_dhcp_clients[i].startcmd, ifd, exec); + } + bb_error_msg("no dhcp clients found"); + return 0; +#endif +} + +static int dhcp_down(struct interface_defn_t *ifd, execfn *exec) +{ +#if ENABLE_APP_UDHCPC + return execute("kill -TERM " + "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); +#else + int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]); + for (i = 0; i < nclients; i++) { + if (exists_execable(ext_dhcp_clients[i].name)) + return execute(ext_dhcp_clients[i].stopcmd, ifd, exec); + } + bb_error_msg("no dhcp clients found, using static interface shutdown"); + return static_down(ifd, exec); +#endif +} + +static int manual_up_down(struct interface_defn_t *ifd, execfn *exec) +{ + return 1; +} + +static int bootp_up(struct interface_defn_t *ifd, execfn *exec) +{ + return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%" + "[[ --server %server%]][[ --hwaddr %hwaddr%]] " + "--returniffail --serverbcast", ifd, exec); +} + +static int ppp_up(struct interface_defn_t *ifd, execfn *exec) +{ + return execute("pon[[ %provider%]]", ifd, exec); +} + +static int ppp_down(struct interface_defn_t *ifd, execfn *exec) +{ + return execute("poff[[ %provider%]]", ifd, exec); +} + +static int wvdial_up(struct interface_defn_t *ifd, execfn *exec) +{ + return execute("start-stop-daemon --start -x wvdial " + "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec); +} + +static int wvdial_down(struct interface_defn_t *ifd, execfn *exec) +{ + return execute("start-stop-daemon --stop -x wvdial " + "-p /var/run/wvdial.%iface% -s 2", ifd, exec); +} + +static const struct method_t methods[] = { + { "manual", manual_up_down, manual_up_down, }, + { "wvdial", wvdial_up, wvdial_down, }, + { "ppp", ppp_up, ppp_down, }, + { "static", static_up, static_down, }, + { "bootp", bootp_up, static_down, }, + { "dhcp", dhcp_up, dhcp_down, }, + { "loopback", loopback_up, loopback_down, }, +}; + +static const struct address_family_t addr_inet = { + "inet", + sizeof(methods) / sizeof(struct method_t), + methods +}; + +#endif /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */ + +static char *next_word(char **buf) +{ + unsigned short length; + char *word; + + if (!buf || !*buf || !**buf) { + return NULL; + } + + /* Skip over leading whitespace */ + word = skip_whitespace(*buf); + + /* Skip over comments */ + if (*word == '#') { + return NULL; + } + + /* Find the length of this word */ + length = strcspn(word, " \t\n"); + if (length == 0) { + return NULL; + } + *buf = word + length; + /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */ + if (**buf) { + **buf = '\0'; + (*buf)++; + } + + return word; +} + +static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name) +{ + int i; + + if (!name) + return NULL; + + for (i = 0; af[i]; i++) { + if (strcmp(af[i]->name, name) == 0) { + return af[i]; + } + } + return NULL; +} + +static const struct method_t *get_method(const struct address_family_t *af, char *name) +{ + int i; + + if (!name) + return NULL; + + for (i = 0; i < af->n_methods; i++) { + if (strcmp(af->method[i].name, name) == 0) { + return &af->method[i]; + } + } + return NULL; +} + +static const llist_t *find_list_string(const llist_t *list, const char *string) +{ + if (string == NULL) + return NULL; + + while (list) { + if (strcmp(list->data, string) == 0) { + return list; + } + list = list->link; + } + return NULL; +} + +static struct interfaces_file_t *read_interfaces(const char *filename) +{ +#if ENABLE_FEATURE_IFUPDOWN_MAPPING + struct mapping_defn_t *currmap = NULL; +#endif + struct interface_defn_t *currif = NULL; + struct interfaces_file_t *defn; + FILE *f; + char *firstword; + char *buf; + + enum { NONE, IFACE, MAPPING } currently_processing = NONE; + + defn = xzalloc(sizeof(struct interfaces_file_t)); + + f = xfopen(filename, "r"); + + while ((buf = xmalloc_getline(f)) != NULL) { + char *buf_ptr = buf; + + firstword = next_word(&buf_ptr); + if (firstword == NULL) { + free(buf); + continue; /* blank line */ + } + + if (strcmp(firstword, "mapping") == 0) { +#if ENABLE_FEATURE_IFUPDOWN_MAPPING + currmap = xzalloc(sizeof(struct mapping_defn_t)); + + while ((firstword = next_word(&buf_ptr)) != NULL) { + if (currmap->max_matches == currmap->n_matches) { + currmap->max_matches = currmap->max_matches * 2 + 1; + currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches); + } + + currmap->match[currmap->n_matches++] = xstrdup(firstword); + } + currmap->max_mappings = 0; + currmap->n_mappings = 0; + currmap->mapping = NULL; + currmap->script = NULL; + { + struct mapping_defn_t **where = &defn->mappings; + while (*where != NULL) { + where = &(*where)->next; + } + *where = currmap; + currmap->next = NULL; + } + debug_noise("Added mapping\n"); +#endif + currently_processing = MAPPING; + } else if (strcmp(firstword, "iface") == 0) { + static const struct address_family_t *const addr_fams[] = { +#if ENABLE_FEATURE_IFUPDOWN_IPV4 + &addr_inet, +#endif +#if ENABLE_FEATURE_IFUPDOWN_IPV6 + &addr_inet6, +#endif + NULL + }; + + char *iface_name; + char *address_family_name; + char *method_name; + llist_t *iface_list; + + currif = xzalloc(sizeof(struct interface_defn_t)); + iface_name = next_word(&buf_ptr); + address_family_name = next_word(&buf_ptr); + method_name = next_word(&buf_ptr); + + if (buf_ptr == NULL) { + bb_error_msg("too few parameters for line \"%s\"", buf); + return NULL; + } + + /* ship any trailing whitespace */ + buf_ptr = skip_whitespace(buf_ptr); + + if (buf_ptr[0] != '\0') { + bb_error_msg("too many parameters \"%s\"", buf); + return NULL; + } + + currif->iface = xstrdup(iface_name); + + currif->address_family = get_address_family(addr_fams, address_family_name); + if (!currif->address_family) { + bb_error_msg("unknown address type \"%s\"", address_family_name); + return NULL; + } + + currif->method = get_method(currif->address_family, method_name); + if (!currif->method) { + bb_error_msg("unknown method \"%s\"", method_name); + return NULL; + } + + for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) { + struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data; + if ((strcmp(tmp->iface, currif->iface) == 0) && + (tmp->address_family == currif->address_family)) { + bb_error_msg("duplicate interface \"%s\"", tmp->iface); + return NULL; + } + } + llist_add_to_end(&(defn->ifaces), (char*)currif); + + debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name); + currently_processing = IFACE; + } else if (strcmp(firstword, "auto") == 0) { + while ((firstword = next_word(&buf_ptr)) != NULL) { + + /* Check the interface isnt already listed */ + if (find_list_string(defn->autointerfaces, firstword)) { + bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf); + } + + /* Add the interface to the list */ + llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword)); + debug_noise("\nauto %s\n", firstword); + } + currently_processing = NONE; + } else { + switch (currently_processing) { + case IFACE: + { + int i; + + if (strlen(buf_ptr) == 0) { + bb_error_msg("option with empty value \"%s\"", buf); + return NULL; + } + + if (strcmp(firstword, "up") != 0 + && strcmp(firstword, "down") != 0 + && strcmp(firstword, "pre-up") != 0 + && strcmp(firstword, "post-down") != 0) { + for (i = 0; i < currif->n_options; i++) { + if (strcmp(currif->option[i].name, firstword) == 0) { + bb_error_msg("duplicate option \"%s\"", buf); + return NULL; + } + } + } + } + if (currif->n_options >= currif->max_options) { + struct variable_t *opt; + + currif->max_options = currif->max_options + 10; + opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options); + currif->option = opt; + } + currif->option[currif->n_options].name = xstrdup(firstword); + currif->option[currif->n_options].value = xstrdup(buf_ptr); + if (!currif->option[currif->n_options].name) { + perror(filename); + return NULL; + } + if (!currif->option[currif->n_options].value) { + perror(filename); + return NULL; + } + debug_noise("\t%s=%s\n", currif->option[currif->n_options].name, + currif->option[currif->n_options].value); + currif->n_options++; + break; + case MAPPING: +#if ENABLE_FEATURE_IFUPDOWN_MAPPING + if (strcmp(firstword, "script") == 0) { + if (currmap->script != NULL) { + bb_error_msg("duplicate script in mapping \"%s\"", buf); + return NULL; + } else { + currmap->script = xstrdup(next_word(&buf_ptr)); + } + } else if (strcmp(firstword, "map") == 0) { + if (currmap->max_mappings == currmap->n_mappings) { + currmap->max_mappings = currmap->max_mappings * 2 + 1; + currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings); + } + currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr)); + currmap->n_mappings++; + } else { + bb_error_msg("misplaced option \"%s\"", buf); + return NULL; + } +#endif + break; + case NONE: + default: + bb_error_msg("misplaced option \"%s\"", buf); + return NULL; + } + } + free(buf); + } + if (ferror(f) != 0) { + bb_perror_msg_and_die("%s", filename); + } + fclose(f); + + return defn; +} + +static char *setlocalenv(const char *format, const char *name, const char *value) +{ + char *result; + char *here; + char *there; + + result = xasprintf(format, name, value); + + for (here = there = result; *there != '=' && *there; there++) { + if (*there == '-') + *there = '_'; + if (isalpha(*there)) + *there = toupper(*there); + + if (isalnum(*there) || *there == '_') { + *here = *there; + here++; + } + } + memmove(here, there, strlen(there) + 1); + + return result; +} + +static void set_environ(struct interface_defn_t *iface, const char *mode) +{ + char **environend; + int i; + const int n_env_entries = iface->n_options + 5; + char **ppch; + + if (my_environ != NULL) { + for (ppch = my_environ; *ppch; ppch++) { + free(*ppch); + *ppch = NULL; + } + free(my_environ); + } + my_environ = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ )); + environend = my_environ; + + for (i = 0; i < iface->n_options; i++) { + if (strcmp(iface->option[i].name, "up") == 0 + || strcmp(iface->option[i].name, "down") == 0 + || strcmp(iface->option[i].name, "pre-up") == 0 + || strcmp(iface->option[i].name, "post-down") == 0) { + continue; + } + *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value); + } + + *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface); + *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name); + *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name); + *(environend++) = setlocalenv("%s=%s", "MODE", mode); + *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH); +} + +static int doit(char *str) +{ + if (option_mask32 & (OPT_no_act|OPT_verbose)) { + puts(str); + } + if (!(option_mask32 & OPT_no_act)) { + pid_t child; + int status; + + fflush(NULL); + child = fork(); + switch (child) { + case -1: /* failure */ + return 0; + case 0: /* child */ + execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, my_environ); + exit(127); + } + waitpid(child, &status, 0); + if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { + return 0; + } + } + return 1; +} + +static int execute_all(struct interface_defn_t *ifd, const char *opt) +{ + int i; + char *buf; + for (i = 0; i < ifd->n_options; i++) { + if (strcmp(ifd->option[i].name, opt) == 0) { + if (!doit(ifd->option[i].value)) { + return 0; + } + } + } + + buf = xasprintf("run-parts /etc/network/if-%s.d", opt); + /* heh, we don't bother free'ing it */ + return doit(buf); +} + +static int check(char *str) +{ + return str != NULL; +} + +static int iface_up(struct interface_defn_t *iface) +{ + if (!iface->method->up(iface, check)) return -1; + set_environ(iface, "start"); + if (!execute_all(iface, "pre-up")) return 0; + if (!iface->method->up(iface, doit)) return 0; + if (!execute_all(iface, "up")) return 0; + return 1; +} + +static int iface_down(struct interface_defn_t *iface) +{ + if (!iface->method->down(iface,check)) return -1; + set_environ(iface, "stop"); + if (!execute_all(iface, "down")) return 0; + if (!iface->method->down(iface, doit)) return 0; + if (!execute_all(iface, "post-down")) return 0; + return 1; +} + +#if ENABLE_FEATURE_IFUPDOWN_MAPPING +static int popen2(FILE **in, FILE **out, char *command, ...) +{ + va_list ap; + char *argv[11] = { command }; + int argc; + int infd[2], outfd[2]; + pid_t pid; + + argc = 1; + va_start(ap, command); + while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) { + argc++; + } + argv[argc] = NULL; /* make sure */ + va_end(ap); + + if (pipe(infd) != 0) { + return 0; + } + + if (pipe(outfd) != 0) { + close(infd[0]); + close(infd[1]); + return 0; + } + + fflush(NULL); + switch (pid = fork()) { + case -1: /* failure */ + close(infd[0]); + close(infd[1]); + close(outfd[0]); + close(outfd[1]); + return 0; + case 0: /* child */ + dup2(infd[0], 0); + dup2(outfd[1], 1); + close(infd[0]); + close(infd[1]); + close(outfd[0]); + close(outfd[1]); + BB_EXECVP(command, argv); + exit(127); + default: /* parent */ + *in = fdopen(infd[1], "w"); + *out = fdopen(outfd[0], "r"); + close(infd[0]); + close(outfd[1]); + return pid; + } + /* unreached */ +} + +static char *run_mapping(char *physical, struct mapping_defn_t * map) +{ + FILE *in, *out; + int i, status; + pid_t pid; + + char *logical = xstrdup(physical); + + /* Run the mapping script. */ + pid = popen2(&in, &out, map->script, physical, NULL); + + /* popen2() returns 0 on failure. */ + if (pid == 0) + return logical; + + /* Write mappings to stdin of mapping script. */ + for (i = 0; i < map->n_mappings; i++) { + fprintf(in, "%s\n", map->mapping[i]); + } + fclose(in); + waitpid(pid, &status, 0); + + if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { + /* If the mapping script exited successfully, try to + * grab a line of output and use that as the name of the + * logical interface. */ + char *new_logical = xmalloc(MAX_INTERFACE_LENGTH); + + if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) { + /* If we are able to read a line of output from the script, + * remove any trailing whitespace and use this value + * as the name of the logical interface. */ + char *pch = new_logical + strlen(new_logical) - 1; + + while (pch >= new_logical && isspace(*pch)) + *(pch--) = '\0'; + + free(logical); + logical = new_logical; + } else { + /* If we are UNABLE to read a line of output, discard our + * freshly allocated memory. */ + free(new_logical); + } + } + + fclose(out); + + return logical; +} +#endif /* FEATURE_IFUPDOWN_MAPPING */ + +static llist_t *find_iface_state(llist_t *state_list, const char *iface) +{ + unsigned short iface_len = strlen(iface); + llist_t *search = state_list; + + while (search) { + if ((strncmp(search->data, iface, iface_len) == 0) && + (search->data[iface_len] == '=')) { + return search; + } + search = search->link; + } + return NULL; +} + +int ifupdown_main(int argc, char **argv); +int ifupdown_main(int argc, char **argv) +{ + int (*cmds)(struct interface_defn_t *) = NULL; + struct interfaces_file_t *defn; + llist_t *state_list = NULL; + llist_t *target_list = NULL; + const char *interfaces = "/etc/network/interfaces"; + FILE *state_fp; + bool any_failures = 0; + + cmds = iface_down; + if (applet_name[2] == 'u') { + /* ifup command */ + cmds = iface_up; + } + + getopt32(argc, argv, OPTION_STR, &interfaces); + if (argc - optind > 0) { + if (DO_ALL) bb_show_usage(); + } else { + if (!DO_ALL) bb_show_usage(); + } + + debug_noise("reading %s file:\n", interfaces); + defn = read_interfaces(interfaces); + debug_noise("\ndone reading %s\n\n", interfaces); + + if (!defn) { + return EXIT_FAILURE; + } + + startup_PATH = getenv("PATH"); + if (!startup_PATH) startup_PATH = ""; + + /* Read the previous state from the state file */ + state_fp = fopen("/var/run/ifstate", "r"); + if (state_fp) { + char *start, *end_ptr; + while ((start = xmalloc_fgets(state_fp)) != NULL) { + /* We should only need to check for a single character */ + end_ptr = start + strcspn(start, " \t\n"); + *end_ptr = '\0'; + llist_add_to(&state_list, start); + } + fclose(state_fp); + } + + /* Create a list of interfaces to work on */ + if (DO_ALL) { + if (cmds == iface_up) { + target_list = defn->autointerfaces; + } else { + /* iface_down */ + const llist_t *list = state_list; + while (list) { + llist_add_to_end(&target_list, xstrdup(list->data)); + list = list->link; + } + target_list = defn->autointerfaces; + } + } else { + llist_add_to_end(&target_list, argv[optind]); + } + + /* Update the interfaces */ + while (target_list) { + llist_t *iface_list; + struct interface_defn_t *currif; + char *iface; + char *liface; + char *pch; + bool okay = 0; + unsigned cmds_ret; + + iface = xstrdup(target_list->data); + target_list = target_list->link; + + pch = strchr(iface, '='); + if (pch) { + *pch = '\0'; + liface = xstrdup(pch + 1); + } else { + liface = xstrdup(iface); + } + + if (!FORCE) { + const llist_t *iface_state = find_iface_state(state_list, iface); + + if (cmds == iface_up) { + /* ifup */ + if (iface_state) { + bb_error_msg("interface %s already configured", iface); + continue; + } + } else { + /* ifdown */ + if (!iface_state) { + bb_error_msg("interface %s not configured", iface); + continue; + } + } + } + +#if ENABLE_FEATURE_IFUPDOWN_MAPPING + if ((cmds == iface_up) && !NO_MAPPINGS) { + struct mapping_defn_t *currmap; + + for (currmap = defn->mappings; currmap; currmap = currmap->next) { + int i; + for (i = 0; i < currmap->n_matches; i++) { + if (fnmatch(currmap->match[i], liface, 0) != 0) + continue; + if (VERBOSE) { + printf("Running mapping script %s on %s\n", currmap->script, liface); + } + liface = run_mapping(iface, currmap); + break; + } + } + } +#endif + + iface_list = defn->ifaces; + while (iface_list) { + currif = (struct interface_defn_t *) iface_list->data; + if (strcmp(liface, currif->iface) == 0) { + char *oldiface = currif->iface; + + okay = 1; + currif->iface = iface; + + debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name); + + /* Call the cmds function pointer, does either iface_up() or iface_down() */ + cmds_ret = cmds(currif); + if (cmds_ret == -1) { + bb_error_msg("don't seem to have all the variables for %s/%s", + liface, currif->address_family->name); + any_failures = 1; + } else if (cmds_ret == 0) { + any_failures = 1; + } + + currif->iface = oldiface; + } + iface_list = iface_list->link; + } + if (VERBOSE) { + puts(""); + } + + if (!okay && !FORCE) { + bb_error_msg("ignoring unknown interface %s", liface); + any_failures = 1; + } else { + llist_t *iface_state = find_iface_state(state_list, iface); + + if (cmds == iface_up) { + char * const newiface = xasprintf("%s=%s", iface, liface); + if (iface_state == NULL) { + llist_add_to_end(&state_list, newiface); + } else { + free(iface_state->data); + iface_state->data = newiface; + } + } else { + /* Remove an interface from state_list */ + llist_unlink(&state_list, iface_state); + free(llist_pop(&iface_state)); + } + } + } + + /* Actually write the new state */ + if (!NO_ACT) { + state_fp = xfopen("/var/run/ifstate", "w"); + while (state_list) { + if (state_list->data) { + fprintf(state_fp, "%s\n", state_list->data); + } + state_list = state_list->link; + } + fclose(state_fp); + } + + return any_failures; +} -- cgit v1.2.3