diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/Makefile.in | 1 | ||||
| -rw-r--r-- | networking/config.in | 6 | ||||
| -rw-r--r-- | networking/ifupdown.c | 1437 |
3 files changed, 1444 insertions, 0 deletions
diff --git a/networking/Makefile.in b/networking/Makefile.in index d6c8592d2..743990bb6 100644 --- a/networking/Makefile.in +++ b/networking/Makefile.in @@ -25,6 +25,7 @@ endif NETWORKING-y:= NETWORKING-$(CONFIG_HOSTNAME) += hostname.o NETWORKING-$(CONFIG_IFCONFIG) += ifconfig.o +NETWORKING-$(CONFIG_IFUPDOWN) += ifupdown.o NETWORKING-$(CONFIG_NC) += nc.o NETWORKING-$(CONFIG_NETSTAT) += netstat.o NETWORKING-$(CONFIG_NSLOOKUP) += nslookup.o diff --git a/networking/config.in b/networking/config.in index bc14940d5..09b2b5c6f 100644 --- a/networking/config.in +++ b/networking/config.in @@ -16,6 +16,12 @@ if [ "$CONFIG_IFCONFIG" = "y" ]; then bool ' Enable option "hw" (ether only)' CONFIG_FEATURE_IFCONFIG_HW bool ' Set the broadcast automatically' CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS fi +bool 'ifupdown' CONFIG_IFUPDOWN +if [ "$CONFIG_IFUPDOWN" = "y" ]; then + bool ' Enable support for IPv4' CONFIG_FEATURE_IFUPDOWN_IPV4 + bool ' Enable support for IPv6 (requires ip command)' CONFIG_FEATURE_IFUPDOWN_IPV6 + bool ' Enable support for IPX (requires ipx_interface command)' CONFIG_FEATURE_IFUPDOWN_IPX +fi bool 'nc' CONFIG_NC bool 'netstat' CONFIG_NETSTAT bool 'nslookup' CONFIG_NSLOOKUP diff --git a/networking/ifupdown.c b/networking/ifupdown.c new file mode 100644 index 000000000..f56842dc7 --- /dev/null +++ b/networking/ifupdown.c @@ -0,0 +1,1437 @@ +/* + * ifupdown for busybox + * Based on ifupdown by Anthony Towns + * Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au> + * + * Remove checks for kernel version, assume kernel version 2.2.0 or better + * + * 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 <sys/stat.h> +#include <sys/utsname.h> +#include <sys/wait.h> + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <fnmatch.h> +#include <getopt.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "busybox.h" +#include "config.h" + +#define IFUPDOWN_VERSION "0.6.4" + +typedef struct interface_defn interface_defn; + +typedef int (execfn)(char *command); +typedef int (command_set)(interface_defn *ifd, execfn *e); + +typedef struct method { + char *name; + command_set *up; + command_set *down; +} method; + +typedef struct address_family { + char *name; + int n_methods; + method *method; +} address_family; + +typedef struct mapping_defn { + struct mapping_defn *next; + + int max_matches; + int n_matches; + char **match; + + char *script; + + int max_mappings; + int n_mappings; + char **mapping; +} mapping_defn; + +typedef struct variable { + char *name; + char *value; +} variable; + +struct interface_defn { + struct interface_defn *next; + + char *iface; + address_family *address_family; + method *method; + + int automatic; + + int max_options; + int n_options; + variable *option; +}; + +typedef struct interfaces_file { + int max_autointerfaces; + int n_autointerfaces; + char **autointerfaces; + + interface_defn *ifaces; + mapping_defn *mappings; +} interfaces_file; + +#define MAX_OPT_DEPTH 10 +#define EUNBALBRACK 10001 +#define EUNDEFVAR 10002 +#define MAX_VARNAME 32 +#define EUNBALPER 10000 + +static int no_act = 0; +static int verbose = 0; +static char **environ = NULL; + +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 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 *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 *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 *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 *ifd, execfn *exec) +{ + if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) { + return(0); + } + return(1); +} + +static int static_down_ipx(interface_defn *ifd, execfn *exec) +{ + if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) { + return(0); + } + return(1); +} + +static int dynamic_up(interface_defn *ifd, execfn *exec) +{ + if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) { + return(0); + } + return(1); +} + +static int dynamic_down(interface_defn *ifd, execfn *exec) +{ + if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) { + return(0); + } + return(1); +} + +static method methods_ipx[] = { + { "dynamic", dynamic_up, dynamic_down, }, + { "static", static_up_ipx, static_down_ipx, }, +}; + +address_family addr_ipx = { + "ipx", + sizeof(methods_ipx) / sizeof(struct method), + methods_ipx +}; +#endif /* IFUP_FEATURE_IPX */ + +#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 +static int loopback_up6(interface_defn *ifd, execfn *exec) +{ + if (!execute("ifconfig %iface% add ::1", ifd, exec)) { + return(0); + } + return(1); +} + +static int loopback_down6(interface_defn *ifd, execfn *exec) +{ + if (!execute("ifconfig %iface% del ::1", ifd, exec)) + return(0); + } + return(1); +} + +static int static_up6(interface_defn *ifd, execfn *exec) +{ + 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); + } + return(1); +} + +static int static_down6(interface_defn *ifd, execfn *exec) +{ + if (!execute("ifconfig %iface% down", ifd, exec)) { + return(0); + } + return(1); +} + +static int v4tunnel_up(interface_defn *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 * ifd, execfn * exec) +{ + if (!execute("ip tunnel del %iface%", ifd, exec)) { + return(0); + } + return(1); +} + +static method methods6[] = { + { "v4tunnel", v4tunnel_up, v4tunnel_down, }, + { "static", static_up6, static_down6, }, + { "loopback", loopback_up6, loopback_down6, }, +}; + +address_family addr_inet6 = { + "inet6", + sizeof(methods6) / sizeof(struct method), + methods6 +}; +#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ + +#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 +static int loopback_up(interface_defn *ifd, execfn *exec) +{ + if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) { + return(0); + } + return(1); +} + +static int loopback_down(interface_defn *ifd, execfn *exec) +{ + if (!execute("ifconfig %iface% down", ifd, exec)) { + return(0); + } + return(1); +} + +static int static_up(interface_defn *ifd, execfn *exec) +{ + 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); + } + return(1); +} + +static int static_down(interface_defn *ifd, execfn *exec) +{ + if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) { + return(0); + } + if (!execute("ifconfig %iface% down", ifd, exec)) { + return(0); + } + return(1); +} + +static int dhcp_up(interface_defn *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 *ifd, execfn *exec) +{ + if (execable("/sbin/dhclient")) { + if (!execute("cat /var/run/dhclient.%iface%.pid | xargs -i kill -TERM {}", 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("cat /var/run/udhcpc.%iface%.pid | xargs -i kill -TERM {}", 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 *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 *ifd, execfn *exec) +{ + if (!execute("ifconfig down %iface%", ifd, exec)) { + return 0; + } + return 1; +} + +static int ppp_up(interface_defn *ifd, execfn *exec) +{ + if (!execute("pon [[%provider%]]", ifd, exec)) { + return 0; + } + return 1; +} + +static int ppp_down(interface_defn *ifd, execfn *exec) +{ + if (!execute("poff [[%provider%]]", ifd, exec)) { + return 0; + } + return 1; +} + +static int wvdial_up(interface_defn *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 *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 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 addr_inet = { + "inet", + sizeof(methods) / sizeof(struct method), + 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 *get_address_family(address_family *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 *get_method(address_family *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 *ifa, interface_defn *ifb) +{ + if (strcmp(ifa->iface, ifb->iface) != 0) { + return(0); + } + if (ifa->address_family != ifb->address_family) { + return(0); + } + return(1); +} + +static int get_line(char **result, size_t * result_len, FILE * f, int *line) +{ + size_t pos; + + do { + pos = 0; + do { + if (*result_len - pos < 10) { + char *newstr = xrealloc(*result, *result_len * 2 + 80); + *result = newstr; + *result_len = *result_len * 2 + 80; + } + + if (!fgets(*result + pos, *result_len - pos, f)) { + if (ferror(f) == 0 && pos == 0) + return 0; + if (ferror(f) != 0) + return 0; + } + pos += xstrlen(*result + pos); + } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n'); + + if (pos != 0 && (*result)[pos - 1] == '\n') { + (*result)[--pos] = '\0'; + } + + (*line)++; + { + int first = 0; + + while (isspace((*result)[first]) && (*result)[first]) { + first++; + } + + memmove(*result, *result + first, pos - first + 1); + pos -= first; + } + } while ((*result)[0] == '#'); + + while ((*result)[pos - 1] == '\\') { + (*result)[--pos] = '\0'; + do { + if (*result_len - pos < 10) { + char *newstr = xrealloc(*result, *result_len * 2 + 80); + *result = newstr; + *result_len = *result_len * 2 + 80; + } + + if (!fgets(*result + pos, *result_len - pos, f)) { + if (ferror(f) == 0 && pos == 0) + return 0; + if (ferror(f) != 0) + return 0; + } + pos += xstrlen(*result + pos); + } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n'); + + if (pos != 0 && (*result)[pos - 1] == '\n') { + (*result)[--pos] = '\0'; + } + (*line)++; + } + + while (isspace((*result)[pos - 1])) { /* remove trailing whitespace */ + pos--; + } + (*result)[pos] = '\0'; + + return 1; +} + +static interfaces_file *read_interfaces(char *filename) +{ + interface_defn *currif = NULL; + interfaces_file *defn; + mapping_defn *currmap = NULL; + FILE *f; + char firstword[80]; + char *buf = NULL; + char *rest; + int line; + size_t buf_len = 0; + + enum { NONE, IFACE, MAPPING } currently_processing = NONE; + + defn = xmalloc(sizeof(interfaces_file)); + 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; + } + line = 0; + + while (get_line(&buf, &buf_len, f, &line)) { + rest = next_word(buf, firstword, 80); + if (rest == NULL) { + continue; /* blank line */ + } + + if (strcmp(firstword, "mapping") == 0) { + + currmap = xmalloc(sizeof(mapping_defn)); + 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 **where = &defn->mappings; + while (*where != NULL) { + where = &(*where)->next; + } + *where = currmap; + currmap->next = NULL; + } + currently_processing = MAPPING; + } else if (strcmp(firstword, "iface") == 0) { + { + char iface_name[80]; + char address_family_name[80]; + char method_name[80]; + address_family *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)); + + 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("%s:%d: too few parameters for iface line", filename, line); + return NULL; + } + + if (rest[0] != '\0') { + error_msg("%s:%d: too many parameters for iface line", filename, line); + return NULL; + } + + currif->iface = xstrdup(iface_name); + + currif->address_family = get_address_family(addr_fams, address_family_name); + if (!currif->address_family) { + error_msg("%s:%d: unknown address type", filename, line); + return NULL; + } + + currif->method = get_method(currif->address_family, method_name); + if (!currif->method) { + error_msg("%s:%d: unknown method", filename, line); + return NULL; + } + + currif->automatic = 1; + currif->max_options = 0; + currif->n_options = 0; + currif->option = NULL; + + + { + interface_defn **where = &defn->ifaces; + + while (*where != NULL) { + if (duplicate_if(*where, currif)) { + error_msg("%s:%d: duplicate interface", filename, line); + 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))) { + int i; + + for (i = 0; i < defn->n_autointerfaces; i++) { + if (strcmp(firstword, defn->autointerfaces[i]) == 0) { + perror_msg("%s:%d: interface declared auto twice", filename, line); + return NULL; + } + } + + if (defn->n_autointerfaces == defn->max_autointerfaces) { + char **tmp; + + defn->max_autointerfaces *= 2; + defn->max_autointerfaces++; + tmp = xrealloc(defn->autointerfaces, sizeof(*tmp) * defn->max_autointerfaces); + defn->autointerfaces = tmp; + } + + defn->autointerfaces[defn->n_autointerfaces] = xstrdup(firstword); + defn->n_autointerfaces++; + } + currently_processing = NONE; + } else { + switch (currently_processing) { + case IFACE: + { + int i; + + if (xstrlen(rest) == 0) { + error_msg("%s:%d: option with empty value", filename, line); + 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("%s:%d: duplicate option", filename, line); + return NULL; + } + } + } + } + if (currif->n_options >= currif->max_options) { + variable *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: + if (strcmp(firstword, "script") == 0) { + if (currmap->script != NULL) { + error_msg("%s:%d: duplicate script in mapping", filename, line); + 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("%s:%d: misplaced option", filename, line); + return NULL; + } + break; + case NONE: + default: + error_msg("%s:%d: misplaced option", filename, line); + return NULL; + } + } + } + if (ferror(f) != 0) { + perror_msg("%s", filename); + return NULL; + } + fclose(f); + line = -1; + + 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 *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); + default: /* parent */ + } + waitpid(child, &status, 0); + if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { + return 0; + } + } + return (1); +} + +static int execute_all(interface_defn *ifd, execfn *exec, char *opt) +{ + int i; + char buf[100]; + + for (i = 0; i < ifd->n_options; i++) { + if (strcmp(ifd->option[i].name, opt) == 0) { + if (!(*exec) (ifd->option[i].value)) { + return 0; + } + } + } + + sprintf(buf, "run-parts /etc/network/if-%s.d", opt); + (*exec) (buf); + + return (1); +} + +static int iface_up(interface_defn *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 *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); +} + +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 * 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; +} + +static int lookfor_iface(char **ifaces, int n_ifaces, char *iface) +{ + int i; + + for (i = 0; i < n_ifaces; i++) { + if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) { + if (ifaces[i][xstrlen(iface)] == '=') { + return i; + } + } + } + + return(-1); +} + +static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface) +{ + if (*max_ifaces == *n_ifaces) { + *max_ifaces = (*max_ifaces * 2) + 1; + *ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces); + } + + (*ifaces)[(*n_ifaces)++] = new_iface; +} + +extern int ifupdown_main(int argc, char **argv) +{ + int (*cmds) (interface_defn *) = NULL; + struct option long_opts[] = { + {"help", no_argument, NULL, 'h'}, + {"verbose", no_argument, NULL, 'v'}, + {"all", no_argument, NULL, 'a'}, + {"interfaces", required_argument, NULL, 'i'}, + {"no-act", no_argument, NULL, 'n'}, + {"no-mappings", no_argument, NULL, 1}, + {"force", no_argument, NULL, 2}, + {0, 0, 0, 0} + }; + interfaces_file *defn; + FILE *state_fp = NULL; + char **target_iface = NULL; + char **state = NULL; /* list of iface=liface */ + char *interfaces = "/etc/network/interfaces"; + char *statefile = "/etc/network/ifstate"; + + int do_all = 0; + int run_mappings = 1; + int force = 0; + int n_target_ifaces = 0; + int n_state = 0; + int max_state = 0; + int i; + + if (applet_name[2] == 'u') { + /* ifup command */ + cmds = iface_up; + } else { + /* ifdown command */ + cmds = iface_down; + } + + while ((i = getopt_long(argc, argv, "i:hvna", long_opts, NULL)) != EOF) { + switch (i) { + case 'i': + interfaces = xstrdup(optarg); + break; + case 'v': + verbose = 1; + break; + case 'a': + do_all = 1; + break; + case 'n': + no_act = 1; + break; + case 1: + run_mappings = 0; + break; + case 2: + 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); + } + + state_fp = fopen(statefile, no_act ? "r" : "a+"); + if (state_fp == NULL && !no_act) { + perror_msg_and_die("failed to open statefile %s", statefile); + } + + if (state_fp != NULL) { + char buf[80]; + char *p; + + if (!no_act) { + int flags; + struct flock lock; + const int state_fd = fileno(state_fp); + + flags = fcntl(state_fd, F_GETFD); + if ((flags < 0) || (fcntl(state_fd, F_SETFD, flags | FD_CLOEXEC) < 0)) { + perror_msg_and_die("failed to set FD_CLOEXEC on statefile %s", statefile); + } + + lock.l_type = F_WRLCK; + lock.l_whence = SEEK_SET; + lock.l_start = 0; + lock.l_len = 0; + + if (fcntl(state_fd, F_SETLKW, &lock) < 0) { + perror_msg_and_die("failed to lock statefile %s", statefile); + } + } + + rewind(state_fp); + while ((p = fgets(buf, sizeof buf, state_fp)) != NULL) { + char *pch; + + pch = buf + xstrlen(buf) - 1; + while (pch > buf && isspace(*pch)) { + pch--; + } + *(pch + 1) = '\0'; + + pch = buf; + while (isspace(*pch)) { + pch++; + } + + add_to_state(&state, &n_state, &max_state, xstrdup(pch)); + } + } + + if (do_all) { + if (cmds == iface_up) { + target_iface = defn->autointerfaces; + n_target_ifaces = defn->n_autointerfaces; + } else if (cmds == iface_down) { + target_iface = state; + n_target_ifaces = n_state; + } + } else { + target_iface = argv + optind; + n_target_ifaces = argc - optind; + } + + + for (i = 0; i < n_target_ifaces; i++) { + interface_defn *currif; + char iface[80]; + char liface[80]; + char *pch; + int okay = 0; + + strncpy(iface, target_iface[i], sizeof(iface)); + iface[sizeof(iface) - 1] = '\0'; + + if ((pch = strchr(iface, '='))) { + *pch = '\0'; + strncpy(liface, pch + 1, sizeof(liface)); + liface[sizeof(liface) - 1] = '\0'; + } else { + strncpy(liface, iface, sizeof(liface)); + liface[sizeof(liface) - 1] = '\0'; + } + if (!force) { + int already_up = lookfor_iface(state, n_state, iface);; + + if (cmds == iface_up) { + /* ifup */ + if (already_up != -1) { + error_msg("interface %s already configured", iface); + continue; + } + } else { + /* ifdown */ + if (already_up == -1) { + error_msg("interface %s not configured", iface); + continue; + } + strncpy(liface, strchr(state[already_up], '=') + 1, 80); + liface[79] = 0; + } + } + + if ((cmds == iface_up) && run_mappings) { + mapping_defn *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; + } + } + } + + + 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); + } + + switch (cmds(currif)) { + case -1: + printf + ("Don't seem to be have all the variables for %s/%s.\n", + liface, currif->address_family->name); + break; + case 0: + /* this wasn't entirely successful, should it be added to + * the state file? + */ + case 1: + /* successful */ + } + currif->iface = oldiface; + } + } + + if (!okay && !force) { + error_msg("Ignoring unknown interface %s=%s.", iface, liface); + } else { + int already_up = lookfor_iface(state, n_state, iface); + + if (cmds == iface_up) { + char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1); + sprintf(newiface, "%s=%s", iface, liface); + if (already_up == -1) { + add_to_state(&state, &n_state, &max_state, newiface); + } else { + free(state[already_up]); + state[already_up] = newiface; + } + } else if (cmds == iface_down) { + if (already_up != -1) { + state[already_up] = state[--n_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); + for (i = 0; i < n_state; i++) { + fputs(state[i], state_fp); + fputc('\n', state_fp); + } + fflush(state_fp); + } + } + + if (state_fp != NULL) { + fclose(state_fp); + state_fp = NULL; + } + + return 0; +} |