/* 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. */ /* TODO: standardise execute() return codes to return 0 for success and 1 for failure */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "busybox.h" #define MAX_OPT_DEPTH 10 #define EUNBALBRACK 10001 #define EUNDEFVAR 10002 #define EUNBALPER 10000 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING #define MAX_INTERFACE_LENGTH 10 #endif #if 0 #define debug_noise(fmt, args...) printf(fmt, ## args) #else #define debug_noise(fmt, args...) #endif /* Forward declaration */ struct interface_defn_t; typedef int (execfn)(char *command); struct method_t { char *name; int (*up)(struct interface_defn_t *ifd, execfn *e); int (*down)(struct interface_defn_t *ifd, execfn *e); }; struct address_family_t { char *name; int n_methods; 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 { struct address_family_t *address_family; 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; }; static char no_act = 0; static char verbose = 0; static char **__myenviron = NULL; #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6 #ifdef CONFIG_FEATURE_IFUPDOWN_IP static unsigned int count_bits(unsigned int a) { unsigned int 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 int 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; result = count_bits(a); result += count_bits(b); result += count_bits(c); result += count_bits(d); return ((int)result); } #endif static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length) { if (*pos + str_length >= *len) { char *newbuf; newbuf = xrealloc(*buf, *len * 2 + str_length + 1); *buf = newbuf; *len = *len * 2 + str_length + 1; } while (str_length-- >= 1) { (*buf)[(*pos)++] = *str; str++; } (*buf)[*pos] = '\0'; } static int strncmpz(char *l, char *r, size_t llen) { int i = strncmp(l, r, llen); if (i == 0) { return(-r[llen]); } else { return(i); } } static char *get_var(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]; strncpy(label_buf, ifd->iface, 19); label_buf[19]=0; result = strchr(label_buf, ':'); if (result) { *result=0; } return( label_buf); } else if (strncmpz(id, "label", idlen) == 0) { return (ifd->iface); } else { 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(char *command, struct interface_defn_t *ifd) { char *result = NULL; size_t pos = 0, len = 0; size_t old_pos[MAX_OPT_DEPTH] = { 0 }; int okay[MAX_OPT_DEPTH] = { 1 }; int opt_depth = 1; while (*command) { switch (*command) { default: addstr(&result, &len, &pos, command, 1); command++; break; case '\\': if (command[1]) { addstr(&result, &len, &pos, command + 1, 1); command += 2; } else { addstr(&result, &len, &pos, command, 1); command++; } break; case '[': if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) { old_pos[opt_depth] = pos; okay[opt_depth] = 1; opt_depth++; command += 2; } else { addstr(&result, &len, &pos, "[", 1); command++; } break; case ']': if (command[1] == ']' && opt_depth > 1) { opt_depth--; if (!okay[opt_depth]) { pos = old_pos[opt_depth]; result[pos] = '\0'; } command += 2; } else { addstr(&result, &len, &pos, "]", 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, &len, &pos, varvalue, strlen(varvalue)); } else { #ifdef CONFIG_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) { int res; varvalue = get_var("netmask", 7, ifd); if (varvalue && (res=count_netmask_bits(varvalue)) > 0) { char argument[255]; sprintf(argument, "%d", res); addstr(&result, &len, &pos, 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); } static int execute(char *command, struct interface_defn_t *ifd, execfn *exec) { char *out; int ret; out = parse(command, ifd); if (!out) { return(0); } ret = (*exec) (out); free(out); if (ret != 1) { return(0); } return(1); } #endif #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_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) { #ifdef CONFIG_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; #ifdef CONFIG_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); 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) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP return(execute("ip link set %iface% down", ifd, exec)); #else return(execute("ifconfig %iface% down", ifd, exec)); #endif } #ifdef CONFIG_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 struct method_t methods6[] = { #ifdef CONFIG_FEATURE_IFUPDOWN_IP { "v4tunnel", v4tunnel_up, v4tunnel_down, }, #endif { "static", static_up6, static_down6, }, { "loopback", loopback_up6, loopback_down6, }, }; static struct address_family_t addr_inet6 = { "inet6", sizeof(methods6) / sizeof(struct method_t), methods6 }; #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 static int loopback_up(struct interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_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) { #ifdef CONFIG_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; #ifdef CONFIG_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 result = execute("ifconfig %iface% %address% netmask %netmask% " "[[broadcast %broadcast%]] [[pointopoint %pointopoint%]] " "[[media %media%]] [[mtu %mtu%]] [[hw %hwaddress%]] up", ifd, exec); result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec); return ((result == 2) ? 2 : 0); #endif } static int static_down(struct interface_defn_t *ifd, execfn *exec) { int result; #ifdef CONFIG_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); } static int execable(char *program) { struct stat buf; if (0 == stat(program, &buf)) { if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) { return(1); } } return(0); } static int dhcp_up(struct interface_defn_t *ifd, execfn *exec) { if (execable("/sbin/udhcpc")) { return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i " "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)); } else if (execable("/sbin/pump")) { return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)); } else if (execable("/sbin/dhclient")) { return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)); } else if (execable("/sbin/dhcpcd")) { return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] " "[[-l %leasetime%]] %iface%", ifd, exec)); } return(0); } static int dhcp_down(struct interface_defn_t *ifd, execfn *exec) { int result = 0; if (execable("/sbin/udhcpc")) { /* SIGUSR2 forces udhcpc to release the current lease and go inactive, * and SIGTERM causes udhcpc to exit. Signals are queued and processed * sequentially so we don't need to sleep */ result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); result += execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); } else if (execable("/sbin/pump")) { result = execute("pump -i %iface% -k", ifd, exec); } else if (execable("/sbin/dhclient")) { result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec); } else if (execable("/sbin/dhcpcd")) { result = execute("dhcpcd -k %iface%", ifd, exec); } return (result || static_down(ifd, exec)); } 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("/sbin/start-stop-daemon --start -x /usr/bin/wvdial " "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)); } static int wvdial_down(struct interface_defn_t *ifd, execfn *exec) { return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial " "-p /var/run/wvdial.%iface% -s 2", ifd, exec)); } static struct method_t methods[] = { { "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 struct address_family_t addr_inet = { "inet", sizeof(methods) / sizeof(struct method_t), methods }; #endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */ static char *next_word(char **buf) { unsigned short length; char *word; if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) { return NULL; } /* Skip over leading whitespace */ word = *buf; while (isspace(*word)) { ++word; } /* 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 struct address_family_t *get_address_family(struct address_family_t *af[], char *name) { int i; for (i = 0; af[i]; i++) { if (strcmp(af[i]->name, name) == 0) { return af[i]; } } return NULL; } static struct method_t *get_method(struct address_family_t *af, char *name) { int i; 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) { 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) { #ifdef CONFIG_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 = bb_xfopen(filename, "r"); while ((buf = bb_get_chomped_line_from_file(f)) != NULL) { char *buf_ptr = buf; firstword = next_word(&buf_ptr); if (firstword == NULL) { free(buf); continue; /* blank line */ } if (strcmp(firstword, "mapping") == 0) { #ifdef CONFIG_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++] = bb_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) { { char *iface_name; char *address_family_name; char *method_name; struct address_family_t *addr_fams[] = { #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 &addr_inet, #endif #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 &addr_inet6, #endif NULL }; 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 */ while (isspace(*buf_ptr)) { ++buf_ptr; } if (buf_ptr[0] != '\0') { bb_error_msg("too many parameters \"%s\"", buf); return NULL; } currif->iface = bb_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; } { llist_t *iface_list; 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), bb_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 = bb_xstrdup(firstword); currif->option[currif->n_options].value = bb_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: #ifdef CONFIG_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 = bb_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] = bb_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(char *format, const char *name, const char *value) { char *result; char *here; char *there; result = bb_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 (__myenviron != NULL) { for (ppch = __myenviron; *ppch; ppch++) { free(*ppch); *ppch = NULL; } free(__myenviron); } __myenviron = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ )); environend = __myenviron; 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", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"); } static int doit(char *str) { if (verbose || no_act) { printf("%s\n", str); } if (!no_act) { pid_t child; int status; fflush(NULL); switch (child = fork()) { case -1: /* failure */ return 0; case 0: /* child */ execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron); 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 = bb_xasprintf("run-parts /etc/network/if-%s.d", opt); if (doit(buf) != 1) { return 0; } return 1; } 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; } #ifdef CONFIG_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]); 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 = bb_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 = (char *)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 /* CONFIG_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 (*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"; const char *statefile = "/var/run/ifstate"; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING int run_mappings = 1; #endif int do_all = 0; int force = 0; int any_failures = 0; int i; if (bb_applet_name[2] == 'u') { /* ifup command */ cmds = iface_up; } else { /* ifdown command */ cmds = iface_down; } #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING while ((i = getopt(argc, argv, "i:hvnamf")) != -1) #else while ((i = getopt(argc, argv, "i:hvnaf")) != -1) #endif { switch (i) { case 'i': /* interfaces */ interfaces = optarg; break; case 'v': /* verbose */ verbose = 1; break; case 'a': /* all */ do_all = 1; break; case 'n': /* no-act */ no_act = 1; break; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING case 'm': /* no-mappings */ run_mappings = 0; break; #endif case 'f': /* force */ force = 1; break; default: bb_show_usage(); break; } } 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) { exit(EXIT_FAILURE); } /* 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, bb_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; int okay = 0; int cmds_ret; iface = bb_xstrdup(target_list->data); target_list = target_list->link; pch = strchr(iface, '='); if (pch) { *pch = '\0'; liface = bb_xstrdup(pch + 1); } else { liface = bb_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; } } } #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING if ((cmds == iface_up) && run_mappings) { struct mapping_defn_t *currmap; for (currmap = defn->mappings; currmap; currmap = currmap->next) { 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) { printf("\n"); } 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 *newiface = bb_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 the linked list */ free(llist_pop(&iface_state)); } } } /* Actually write the new state */ if (!no_act) { FILE *state_fp = NULL; state_fp = bb_xfopen(statefile, "w"); while (state_list) { if (state_list->data) { fputs(state_list->data, state_fp); fputc('\n', state_fp); } state_list = state_list->link; } fclose(state_fp); } if (any_failures) return 1; return 0; }