/* * ifupdown for busybox * Copyright (c) 2002 Glenn McGrath * * 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. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "libbb.h" #define MAX_OPT_DEPTH 10 #define EUNBALBRACK 10001 #define EUNDEFVAR 10002 #define EUNBALPER 10000 typedef struct interface_defn_s interface_defn_t; typedef int (execfn)(char *command); typedef int (command_set)(interface_defn_t *ifd, execfn *e); typedef struct method_s { char *name; command_set *up; command_set *down; } method_t; typedef struct address_family_s { char *name; int n_methods; method_t *method; } address_family_t; typedef struct mapping_defn_s { struct mapping_defn_s *next; int max_matches; int n_matches; char **match; char *script; int max_mappings; int n_mappings; char **mapping; } mapping_defn_t; typedef struct variable_s { char *name; char *value; } variable_t; struct interface_defn_s { struct interface_defn_s *next; char *iface; address_family_t *address_family; method_t *method; int automatic; int max_options; int n_options; variable_t *option; }; typedef struct interfaces_file_s { llist_t *autointerfaces; interface_defn_t *ifaces; mapping_defn_t *mappings; } interfaces_file_t; static char no_act = 0; static char verbose = 0; static char **environ = NULL; 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, interface_defn_t *ifd) { int i; if (strncmpz(id, "iface", 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, 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, xstrlen(varvalue)); } else { 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, interface_defn_t *ifd, execfn *exec) { char *out; int ret; out = parse(command, ifd); if (!out) { return(0); } ret = (*exec) (out); free(out); return(ret); } #ifdef CONFIG_FEATURE_IFUPDOWN_IPX static int static_up_ipx(interface_defn_t *ifd, execfn *exec) { if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) { return(0); } return(1); } static int static_down_ipx(interface_defn_t *ifd, execfn *exec) { if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) { return(0); } return(1); } static int dynamic_up(interface_defn_t *ifd, execfn *exec) { if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) { return(0); } return(1); } static int dynamic_down(interface_defn_t *ifd, execfn *exec) { if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) { return(0); } return(1); } static method_t methods_ipx[] = { { "dynamic", dynamic_up, dynamic_down, }, { "static", static_up_ipx, static_down_ipx, }, }; address_family_t addr_ipx = { "ipx", sizeof(methods_ipx) / sizeof(method_t), methods_ipx }; #endif /* IFUP_FEATURE_IPX */ #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 static int loopback_up6(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip link set %iface% up", ifd, exec)) return(0); if (!execute("ip addr add ::1 dev %iface%", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% add ::1", ifd, exec)) return(0); #endif return(1); } static int loopback_down6(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip link set %iface% down", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% del ::1", ifd, exec)) return(0); #endif return(1); } static int static_up6(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip link set %iface% up", ifd, exec)) return(0); if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) return(0); if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) { return(0); } if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) { return(0); } if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) { return(0); } #endif return(1); } static int static_down6(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip link set %iface% down", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } #endif return(1); } #ifdef CONFIG_FEATURE_IFUPDOWN_IP static int v4tunnel_up(interface_defn_t *ifd, execfn *exec) { if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) { return(0); } if (!execute("ip link set %iface% up", ifd, exec)) { return(0); } if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) { return(0); } if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) { return(0); } return(1); } static int v4tunnel_down(interface_defn_t * ifd, execfn * exec) { if (!execute("ip tunnel del %iface%", ifd, exec)) { return(0); } return(1); } #endif static method_t methods6[] = { #ifdef CONFIG_FEATURE_IFUPDOWN_IP { "v4tunnel", v4tunnel_up, v4tunnel_down, }, #endif { "static", static_up6, static_down6, }, { "loopback", loopback_up6, loopback_down6, }, }; address_family_t addr_inet6 = { "inet6", sizeof(methods6) / sizeof(method_t), methods6 }; #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 static int loopback_up(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip link set %iface% up", ifd, exec)) return(0); if (!execute("ip addr add 127.0.0.1 dev %iface%", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) { return(0); } #endif return(1); } static int loopback_down(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip -f inet addr flush dev %iface%", ifd, exec)) return(0); if (!execute("ip link set %iface% down", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% 127.0.0.1 down", ifd, exec)) { return(0); } #endif return(1); } static int static_up(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("ip link set %iface% up", ifd, exec)) return(0); if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) return(0); if (!execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec)) return(0); #else if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]] [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]] [[hw %hwaddress%]] up", ifd, exec)) { return(0); } if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) { return(0); } #endif return(1); } static int static_down(interface_defn_t *ifd, execfn *exec) { #ifdef CONFIG_FEATURE_IFUPDOWN_IP if (!execute("[[ ip route del default via %gateway% dev %iface% ]]", ifd, exec)) return(0); if (!execute("ip -f inet addr flush dev %iface%", ifd, exec)) return(0); if (!execute("ip link set %iface% down", ifd, exec)) return(0); #else if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) { return(0); } if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } #endif return(1); } 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(interface_defn_t *ifd, execfn *exec) { if (execable("/sbin/dhclient")) { if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) { return(0); } } else if (execable("/sbin/pump")) { if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) { return(0); } } else if (execable("/sbin/udhcpc")) { if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) { return 0; } } else if (execable("/sbin/dhcpcd")) { if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) { return(0); } } return(1); } static int dhcp_down(interface_defn_t *ifd, execfn *exec) { if (execable("/sbin/dhclient")) { if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) { return(0); } } else if (execable("/sbin/pump")) { if (!execute("pump -i %iface% -k", ifd, exec)) { return(0); } } else if (execable("/sbin/udhcpc")) { if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) { return(0); } } else if (execable("/sbin/dhcpcd")) { if (!execute("dhcpcd -k %iface%", ifd, exec)) { return(0); } } if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } return(1); } static int bootp_up(interface_defn_t *ifd, execfn *exec) { if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]] [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) { return 0; } return 1; } static int bootp_down(interface_defn_t *ifd, execfn *exec) { if (!execute("ifconfig down %iface%", ifd, exec)) { return 0; } return 1; } static int ppp_up(interface_defn_t *ifd, execfn *exec) { if (!execute("pon [[%provider%]]", ifd, exec)) { return 0; } return 1; } static int ppp_down(interface_defn_t *ifd, execfn *exec) { if (!execute("poff [[%provider%]]", ifd, exec)) { return 0; } return 1; } static int wvdial_up(interface_defn_t *ifd, execfn *exec) { if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) { return 0; } return 1; } static int wvdial_down(interface_defn_t *ifd, execfn *exec) { if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) { return 0; } return 1; } static method_t methods[] = { { "wvdial", wvdial_up, wvdial_down, }, { "ppp", ppp_up, ppp_down, }, { "static", static_up, static_down, }, { "bootp", bootp_up, bootp_down, }, { "dhcp", dhcp_up, dhcp_down, }, { "loopback", loopback_up, loopback_down, }, }; address_family_t addr_inet = { "inet", sizeof(methods) / sizeof(method_t), methods }; #endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */ static char *next_word(char *buf, char *word, int maxlen) { if (!buf) return NULL; if (!*buf) return NULL; while (!isspace(*buf) && *buf) { if (maxlen-- > 1) *word++ = *buf; buf++; } if (maxlen > 0) { *word = '\0'; } while (isspace(*buf) && *buf) { buf++; } return buf; } static address_family_t *get_address_family(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 method_t *get_method(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 int duplicate_if(interface_defn_t *ifa, interface_defn_t *ifb) { if (strcmp(ifa->iface, ifb->iface) != 0) { return(0); } if (ifa->address_family != ifb->address_family) { return(0); } return(1); } 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 interfaces_file_t *read_interfaces(char *filename) { interface_defn_t *currif = NULL; interfaces_file_t *defn; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING mapping_defn_t *currmap = NULL; #endif FILE *f; char firstword[80]; char *buf = NULL; char *rest; // int line; enum { NONE, IFACE, MAPPING } currently_processing = NONE; defn = xmalloc(sizeof(interfaces_file_t)); // defn->max_autointerfaces = defn->n_autointerfaces = 0; defn->autointerfaces = NULL; defn->mappings = NULL; defn->ifaces = NULL; f = fopen(filename, "r"); if (f == NULL) { return NULL; } while ((buf = get_line_from_file(f)) != NULL) { char *end; if (buf[0] == '#') { continue; } end = last_char_is(buf, '\n'); if (end) { *end = '\0'; } while ((end = last_char_is(buf, ' ')) != NULL) { *end = '\0'; } rest = next_word(buf, firstword, 80); if (rest == NULL) { continue; /* blank line */ } if (strcmp(firstword, "mapping") == 0) { #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING currmap = xmalloc(sizeof(mapping_defn_t)); currmap->max_matches = 0; currmap->n_matches = 0; currmap->match = NULL; while ((rest = next_word(rest, firstword, 80))) { 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; { mapping_defn_t **where = &defn->mappings; while (*where != NULL) { where = &(*where)->next; } *where = currmap; currmap->next = NULL; } #endif currently_processing = MAPPING; } else if (strcmp(firstword, "iface") == 0) { { char iface_name[80]; char address_family_name[80]; char method_name[80]; address_family_t *addr_fams[] = { #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 &addr_inet, #endif #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 &addr_inet6, #endif #ifdef CONFIG_FEATURE_IFUPDOWN_IPX &addr_ipx, #endif NULL }; currif = xmalloc(sizeof(interface_defn_t)); rest = next_word(rest, iface_name, 80); rest = next_word(rest, address_family_name, 80); rest = next_word(rest, method_name, 80); if (rest == NULL) { error_msg("too few parameters for line \"%s\"", buf); return NULL; } if (rest[0] != '\0') { 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) { error_msg("unknown address type \"%s\"", buf); return NULL; } currif->method = get_method(currif->address_family, method_name); if (!currif->method) { error_msg("unknown method \"%s\"", buf); return NULL; } currif->automatic = 1; currif->max_options = 0; currif->n_options = 0; currif->option = NULL; { interface_defn_t **where = &defn->ifaces; while (*where != NULL) { if (duplicate_if(*where, currif)) { error_msg("duplicate interface \"%s\"", buf); return NULL; } where = &(*where)->next; } *where = currif; currif->next = NULL; } } currently_processing = IFACE; } else if (strcmp(firstword, "auto") == 0) { while ((rest = next_word(rest, firstword, 80))) { /* Check the interface isnt already listed */ if (find_list_string(defn->autointerfaces, firstword)) { perror_msg_and_die("interface declared auto twice \"%s\"", buf); } /* Add the interface to the list */ defn->autointerfaces = llist_add_to(defn->autointerfaces, strdup(firstword)); } currently_processing = NONE; } else { switch (currently_processing) { case IFACE: { int i; if (xstrlen(rest) == 0) { 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) { error_msg("duplicate option \"%s\"", buf); return NULL; } } } } if (currif->n_options >= currif->max_options) { 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(rest); if (!currif->option[currif->n_options].name) { perror(filename); return NULL; } if (!currif->option[currif->n_options].value) { perror(filename); return NULL; } currif->n_options++; break; case MAPPING: #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING if (strcmp(firstword, "script") == 0) { if (currmap->script != NULL) { error_msg("duplicate script in mapping \"%s\"", buf); return NULL; } else { currmap->script = xstrdup(rest); } } 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(rest); currmap->n_mappings++; } else { error_msg("misplaced option \"%s\"", buf); return NULL; } #endif break; case NONE: default: error_msg("misplaced option \"%s\"", buf); return NULL; } } } if (ferror(f) != 0) { perror_msg("%s", filename); return NULL; } fclose(f); return defn; } static int check(char *str) { return (str != NULL); } static char *setlocalenv(char *format, char *name, char *value) { char *result; char *here; char *there; result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(value) + 1); sprintf(result, 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, xstrlen(there) + 1); return result; } static void set_environ(interface_defn_t *iface, char *mode) { char **environend; int i; const int n_env_entries = iface->n_options + 5; char **ppch; if (environ != NULL) { for (ppch = environ; *ppch; ppch++) { free(*ppch); *ppch = NULL; } free(environ); environ = NULL; } environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ )); environend = environ; *environend = NULL; 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 = NULL; } *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "MODE", mode); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"); *environend = NULL; } static int doit(char *str) { if (verbose || no_act) { error_msg("%s", str); } if (!no_act) { pid_t child; int status; fflush(NULL); switch (child = fork()) { case -1: /* failure */ return 0; case 0: /* child */ execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ); exit(127); } waitpid(child, &status, 0); if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { return 0; } } return (1); } static int execute_all(interface_defn_t *ifd, execfn *exec, const char *opt) { int i; char *buf; for (i = 0; i < ifd->n_options; i++) { if (strcmp(ifd->option[i].name, opt) == 0) { if (!(*exec) (ifd->option[i].value)) { return 0; } } } buf = xmalloc(xstrlen(opt) + 19); sprintf(buf, "/etc/network/if-%s.d", opt); run_parts(&buf, 0); free(buf); return (1); } static int iface_up(interface_defn_t *iface) { if (!iface->method->up(iface, check)) { return (-1); } set_environ(iface, "start"); if (!execute_all(iface, doit, "pre-up")) { return (0); } if (!iface->method->up(iface, doit)) { return (0); } if (!execute_all(iface, doit, "up")) { return (0); } return (1); } static int iface_down(interface_defn_t *iface) { if (!iface->method->down(iface, check)) { return (-1); } set_environ(iface, "stop"); if (!execute_all(iface, doit, "down")) { return (0); } if (!iface->method->down(iface, doit)) { return (0); } if (!execute_all(iface, doit, "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 int run_mapping(char *physical, char *logical, int len, mapping_defn_t * map) { FILE *in, *out; int i, status; pid_t pid; pid = popen2(&in, &out, map->script, physical, NULL); if (pid == 0) { return 0; } 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 (fgets(logical, len, out)) { char *pch = logical + xstrlen(logical) - 1; while (pch >= logical && isspace(*pch)) *(pch--) = '\0'; } } fclose(out); return 1; } #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ static llist_t *find_iface_state(llist_t *state_list, const char *iface) { unsigned short iface_len = xstrlen(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); } extern int ifupdown_main(int argc, char **argv) { int (*cmds) (interface_defn_t *) = NULL; interfaces_file_t *defn; FILE *state_fp = NULL; llist_t *state_list = NULL; llist_t *target_list = NULL; 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 i; if (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 = xstrdup(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: show_usage(); break; } } if (argc - optind > 0) { if (do_all) { show_usage(); } } else { if (!do_all) { show_usage(); } } defn = read_interfaces(interfaces); if (!defn) { error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces); } if (no_act) { state_fp = fopen(statefile, "r"); } else { state_fp = xfopen(statefile, "a+"); } /* Read the previous state from the state file */ if (state_fp != NULL) { char *start; while ((start = get_line_from_file(state_fp)) != NULL) { char *end_ptr; /* We should only need to check for a single character */ end_ptr = start + strcspn(start, " \t\n"); *end_ptr = '\0'; state_list = llist_add_to(state_list, start); } } /* Create a list of interfaces to work on */ if (do_all) { if (cmds == iface_up) { target_list = defn->autointerfaces; } else if (cmds == iface_down) { const llist_t *list = state_list; while (list) { target_list = llist_add_to(target_list, strdup(list->data)); list = list->link; } } } else { target_list = llist_add_to(target_list, argv[optind]); } /* Update the interfaces */ while (target_list) { interface_defn_t *currif; char *iface; char *liface; char *pch; int okay = 0; iface = strdup(target_list->data); target_list = target_list->link; pch = strchr(iface, '='); if (pch) { *pch = '\0'; liface = strdup(pch + 1); } else { liface = strdup(iface); } if (!force) { const llist_t *iface_state = find_iface_state(state_list, iface); if (cmds == iface_up) { /* ifup */ if (iface_state) { error_msg("interface %s already configured", iface); continue; } } else { /* ifdown */ if (iface_state == NULL) { error_msg("interface %s not configured", iface); continue; } pch = strchr(iface_state->data, '='); liface = strdup(pch + 1); } } #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING if ((cmds == iface_up) && run_mappings) { 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) { error_msg("Running mapping script %s on %s", currmap->script, liface); } run_mapping(iface, liface, sizeof(liface), currmap); break; } } } #endif for (currif = defn->ifaces; currif; currif = currif->next) { if (strcmp(liface, currif->iface) == 0) { char *oldiface = currif->iface; okay = 1; currif->iface = iface; if (verbose) { error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name); } /* Call the cmds function pointer, does either iface_up() or iface_down() */ if (cmds(currif) == -1) { printf ("Don't seem to be have all the variables for %s/%s.\n", liface, currif->address_family->name); } currif->iface = oldiface; } } if (!okay && !force) { error_msg("Ignoring unknown interface %s=%s.", iface, liface); } else { llist_t *iface_state = find_iface_state(state_list, iface); if (cmds == iface_up) { char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1); sprintf(newiface, "%s=%s", iface, liface); if (iface_state == NULL) { state_list = llist_add_to(state_list, newiface); } else { free(iface_state->data); iface_state->data = newiface; } } else if (cmds == iface_down) { /* Remove an interface from the linked list */ if (iface_state) { /* This needs to be done better */ free(iface_state->data); free(iface_state->link); if (iface_state->link) { iface_state->data = iface_state->link->data; iface_state->link = iface_state->link->link; } else { iface_state->data = NULL; iface_state->link = NULL; } } } } } /* Actually write the new state */ if (state_fp != NULL && !no_act) { if (ftruncate(fileno(state_fp), 0) < 0) { error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno)); } rewind(state_fp); while (state_list) { if (state_list->data) { fputs(state_list->data, state_fp); fputc('\n', state_fp); } state_list = state_list->link; } fflush(state_fp); } /* Cleanup */ if (state_fp != NULL) { fclose(state_fp); state_fp = NULL; } return 0; }