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Diffstat (limited to 'i/pc104/initrd/conf/busybox/networking/ifupdown.c')
-rw-r--r--i/pc104/initrd/conf/busybox/networking/ifupdown.c1273
1 files changed, 1273 insertions, 0 deletions
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 <bug1@iinet.net.au>
+ * Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
+ *
+ * Based on ifupdown v 0.6.4 by Anthony Towns
+ * Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
+ *
+ * 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 <sys/utsname.h>
+#include <fnmatch.h>
+#include <getopt.h>
+
+#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;
+}