diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/starter/interfaces.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/starter/interfaces.c b/src/starter/interfaces.c index 3fff65be7..de79e2da1 100644 --- a/src/starter/interfaces.c +++ b/src/starter/interfaces.c @@ -14,6 +14,7 @@ #include <sys/socket.h> #include <sys/ioctl.h> +#include <sys/types.h> #ifdef HAVE_SYS_SOCKIO_H #include <sys/sockio.h> #endif @@ -33,6 +34,8 @@ #include "exec.h" #include "files.h" +const char* IP_ROUTE = "ip route show table default 0.0.0.0/0"; + /* * discover the default route via /proc/net/route */ @@ -101,6 +104,83 @@ get_defaultroute(defaultroute_t *defaultroute) } } fclose(fd); + + /* If there is no default route in the "main" table, also look at the "default" one. */ + if (!defaultroute->defined) + { + plog("no default route in table 'main', checking table 'default' instead"); + + pid_t pid; + int rv; + int commpipe[2]; /* This holds the fd for the input & output of the pipe */ + + /* Setup communication pipeline first */ + if (pipe(commpipe)) + { + plog("unable to open pipe to execute '%s' command", IP_ROUTE); + } + else + { + /* Attempt to fork and check for errors */ + if( (pid=fork()) == -1) + { + plog("unable to fork process, this should not happen"); + } + else if (pid) + { + close(commpipe[1]); /* Close unused side of pipe (out side from this process) */ + setvbuf(stdout,(char*)NULL,_IONBF,0); /* Set non-buffered output on stdout */ + wait(&rv); /* Wait for child process to end */ + if (rv != 0) + plog("'%s' command exited with code %d", IP_ROUTE, rv); + else + { + /* parse the output - it should only be one line */ + while (fgets(line, sizeof(line), commpipe[0]) != 0) + { + char destination[19]; + char buf1[4], buf2[4]; + char gateway[16]; + char iface[11]; + + /* parsing a single line of the output */ + items = sscanf(line, "%s %s %s %s %s", + destination, buf1, gateway, buf2, iface); + if (items < 5) + { + plog("parsing error while scanning 'ip route' output"); + continue; + } + + if (streq(destination, "default") + { + if (defaultroute->defined) + { + plog("multiple default routes in table 'default' - cannot cope with %%defaultroute!!!"); + defaultroute->defined = FALSE; + close(commpipe[0]); + return; + } + + ttoaddr(gateway, strlen(gateway), AF_INET, &defaultroute->nexthop); + strncpy(defaultroute->iface, iface, IFNAMSIZ); + defaultroute->defined = TRUE; + } + } + close(commpipe[0]); + } + else + { + /* A zero PID indicates that this is the child process */ + dup2(commpipe[0],0); /* Replace stdin with the in side of the pipe */ + close(commpipe[1]); /* Close unused side of pipe (out side) */ + /* Replace the child fork with a new process */ + if(execl("ip", IP_ROUTE, NULL) == -1){ + plog("unable to execute '%s' command", IP_ROUTE); + } + } + } + } if (!defaultroute->defined) { |