From 008d0be72b2f160382c6e880765e96b64a050c65 Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 12:04:58 +0100 Subject: imported original firmware WRT54GL_v4.30.11_11_US --- release/src/router/busybox/networking/ifupdown.c | 1453 ++++++++++++++++++++++ 1 file changed, 1453 insertions(+) create mode 100644 release/src/router/busybox/networking/ifupdown.c (limited to 'release/src/router/busybox/networking/ifupdown.c') diff --git a/release/src/router/busybox/networking/ifupdown.c b/release/src/router/busybox/networking/ifupdown.c new file mode 100644 index 00000000..bae9f4ea --- /dev/null +++ b/release/src/router/busybox/networking/ifupdown.c @@ -0,0 +1,1453 @@ +/* vi: set sw=4 ts=4: */ +/* + * ifupdown for busybox + * Copyright (c) 2002 Glenn McGrath + * Copyright (c) 2003 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. + * + * 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 + +#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); +typedef int (command_set)(struct interface_defn_t *ifd, execfn *e); + +extern llist_t *llist_add_to_end(llist_t *list_head, char *data) +{ + llist_t *new_item, *tmp, *prev; + + new_item = xmalloc(sizeof(llist_t)); + new_item->data = data; + new_item->link = NULL; + + prev = NULL; + tmp = list_head; + while(tmp) { + prev = tmp; + tmp = tmp->link; + } + if (prev) { + prev->link = new_item; + } else { + list_head = new_item; + } + + return(list_head); +} + +struct method_t +{ + char *name; + command_set *up; + command_set *down; +}; + +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 interface_defn_t *prev; + struct interface_defn_t *next; + + char *iface; + struct address_family_t *address_family; + struct method_t *method; + + int automatic; + + 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 **environ = NULL; + +#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, bb_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, bb_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); + return(1); +} + +#ifdef CONFIG_FEATURE_IFUPDOWN_IPX +static int static_up_ipx(struct interface_defn_t *ifd, execfn *exec) +{ + return(execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)); +} + +static int static_down_ipx(struct interface_defn_t *ifd, execfn *exec) +{ + return(execute("ipx_interface del %iface% %frame%", ifd, exec)); +} + +static int dynamic_up(struct interface_defn_t *ifd, execfn *exec) +{ + return(execute("ipx_interface add %iface% %frame%", ifd, exec)); +} + +static int dynamic_down(struct interface_defn_t *ifd, execfn *exec) +{ + return(execute("ipx_interface del %iface% %frame%", ifd, exec)); +} + +static struct method_t methods_ipx[] = { + { "dynamic", dynamic_up, dynamic_down, }, + { "static", static_up_ipx, static_down_ipx, }, +}; + +struct address_family_t addr_ipx = { + "ipx", + sizeof(methods_ipx) / sizeof(struct method_t), + methods_ipx +}; +#endif /* IFUP_FEATURE_IPX */ + +#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% label %label%", ifd, exec); + result += execute("ip link set %iface% up", ifd, exec); + return( result); +#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 %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); +} + +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% label %label%", ifd, exec); + result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec); + return( result); +} + +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, }, +}; + +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% label %label%", ifd, exec); + result += execute("ip link set %iface% up", ifd, exec); + return(result); +#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); +#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% label %label%", ifd, exec); + result += execute("ip link set %iface% up", ifd, exec); + result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec); +#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); +#endif + return(result); +} + +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); +} + +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")) { + execute("kill -9 `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")) { + execute("kill -9 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); + } else if (execable("/sbin/dhcpcd")) { + result = execute("dhcpcd -k %iface%", ifd, exec); + } + return (result || execute("ifconfig %iface% 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 bootp_down(struct interface_defn_t *ifd, execfn *exec) +{ + return( execute("ifconfig down %iface%", 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, bootp_down, }, + { "dhcp", dhcp_up, dhcp_down, }, + { "loopback", loopback_up, loopback_down, }, +}; + +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 int duplicate_if(struct interface_defn_t *ifa, struct 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 struct interfaces_file_t *read_interfaces(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 = xmalloc(sizeof(struct interfaces_file_t)); + defn->autointerfaces = NULL; + defn->mappings = NULL; + defn->ifaces = NULL; + + 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 = xmalloc(sizeof(struct mapping_defn_t)); + currmap->max_matches = 0; + currmap->n_matches = 0; + currmap->match = NULL; + + 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 +#ifdef CONFIG_FEATURE_IFUPDOWN_IPX + &addr_ipx, +#endif + NULL + }; + + currif = xmalloc(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\"", buf); + return NULL; + } + + currif->method = get_method(currif->address_family, method_name); + if (!currif->method) { + bb_error_msg("unknown method \"%s\"", buf); + return NULL; + } + + currif->automatic = 1; + currif->max_options = 0; + currif->n_options = 0; + currif->option = NULL; + + { + struct interface_defn_t *tmp; + llist_t *iface_list; + iface_list = defn->ifaces; + while (iface_list) { + tmp = (struct interface_defn_t *) iface_list->data; + if (duplicate_if(tmp, currif)) { + bb_error_msg("duplicate interface \"%s\"", tmp->iface); + return NULL; + } + iface_list = iface_list->link; + } + + defn->ifaces = 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 */ + defn->autointerfaces = llist_add_to_end(defn->autointerfaces, strdup(firstword)); + debug_noise("\nauto %s\n", firstword); + } + currently_processing = NONE; + } else { + switch (currently_processing) { + case IFACE: + { + int i; + + if (bb_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, char *name, char *value) +{ + char *result; + char *here; + char *there; + + result = xmalloc(bb_strlen(format) + bb_strlen(name) + bb_strlen(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, bb_strlen(there) + 1); + + return result; +} + +static void set_environ(struct 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) { + 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("/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(struct interface_defn_t *ifd, execfn *exec, const char *opt) +{ + int i; + char *buf[2]; + + for (i = 0; i < ifd->n_options; i++) { + if (strcmp(ifd->option[i].name, opt) == 0) { + if (!(*exec) (ifd->option[i].value)) { + return 0; + } + } + } + + bb_xasprintf(&buf[0], "/etc/network/if-%s.d", opt); + buf[1] = NULL; + + run_parts(buf, 2, environ); + free(buf[0]); + return (1); +} + +static int check(char *str) { + return str != NULL; +} + +static int iface_up(struct interface_defn_t *iface) +{ + int result; + if (!iface->method->up(iface,check)) return -1; + set_environ(iface, "start"); + result = execute_all(iface, doit, "pre-up"); + result += iface->method->up(iface, doit); + result += execute_all(iface, doit, "up"); + return(result); +} + +static int iface_down(struct interface_defn_t *iface) +{ + int result; + if (!iface->method->down(iface,check)) return -1; + set_environ(iface, "stop"); + result = execute_all(iface, doit, "down"); + result += iface->method->down(iface, doit); + result += execute_all(iface, doit, "post-down"); + return(result); +} + +#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 + bb_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 are + * 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 = bb_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); +} + +extern int ifupdown_main(int argc, char **argv) +{ + int (*cmds) (struct interface_defn_t *) = NULL; + struct 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 (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 = bb_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: + 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); + } + + if (no_act) { + state_fp = fopen(statefile, "r"); + } + + /* Create a list of interfaces to work on */ + if (do_all) { + if (cmds == iface_up) { + target_list = defn->autointerfaces; + } else { +#if 0 + /* iface_down */ + llist_t *new_item; + const llist_t *list = state_list; + while (list) { + new_item = xmalloc(sizeof(llist_t)); + new_item->data = strdup(list->data); + new_item->link = NULL; + list = target_list; + if (list == NULL) + target_list = new_item; + else { + while (list->link) { + list = list->link; + } + list = new_item; + } + list = list->link; + } + target_list = defn->autointerfaces; +#else + + /* iface_down */ + const llist_t *list = state_list; + while (list) { + target_list = llist_add_to_end(target_list, strdup(list->data)); + list = list->link; + } + target_list = defn->autointerfaces; +#endif + } + } else { + target_list = 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; + + 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) { + 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() */ + if (cmds(currif) == -1) { + bb_error_msg("Don't seem to be have all the variables for %s/%s.", + liface, currif->address_family->name); + } + + currif->iface = oldiface; + } + iface_list = iface_list->link; + } + if (verbose) { + printf("\n"); + } + + if (!okay && !force) { + bb_error_msg("Ignoring unknown interface %s", liface); + } else { + llist_t *iface_state = find_iface_state(state_list, iface); + + if (cmds == iface_up) { + char *newiface = xmalloc(bb_strlen(iface) + 1 + bb_strlen(liface) + 1); + sprintf(newiface, "%s=%s", iface, liface); + if (iface_state == NULL) { + state_list = llist_add_to_end(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 (!no_act) { + + if (state_fp) + fclose(state_fp); + state_fp = bb_xfopen(statefile, "a+"); + + if (ftruncate(fileno(state_fp), 0) < 0) { + bb_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; +} -- cgit v1.2.3-54-g00ecf