diff options
| -rw-r--r-- | networking/ifupdown.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/networking/ifupdown.c b/networking/ifupdown.c index 6c79c2004..5b37c3ab7 100644 --- a/networking/ifupdown.c +++ b/networking/ifupdown.c @@ -49,6 +49,9 @@ #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) @@ -1106,12 +1109,13 @@ static int popen2(FILE **in, FILE **out, char *command, ...) /* unreached */ } -static int run_mapping(char *physical, char *logical, int len, struct mapping_defn_t * map) +static char * run_mapping(char *physical, char *logical, int len, struct mapping_defn_t * map) { FILE *in, *out; int i, status; pid_t pid; + char *new_logical = NULL; pid = popen2(&in, &out, map->script, physical, NULL); if (pid == 0) { @@ -1123,16 +1127,18 @@ static int run_mapping(char *physical, char *logical, int len, struct mapping_de fclose(in); waitpid(pid, &status, 0); if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { - if (fgets(logical, len, out)) { - char *pch = logical + bb_strlen(logical) - 1; + new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH); + + if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) { + char *pch = new_logical + bb_strlen(new_logical) - 1; - while (pch >= logical && isspace(*pch)) + while (pch >= new_logical && isspace(*pch)) *(pch--) = '\0'; } } fclose(out); - return 1; + return new_logical ? new_logical : logical; } #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ @@ -1318,7 +1324,7 @@ extern int ifupdown_main(int argc, char **argv) if (verbose) { printf("Running mapping script %s on %s\n", currmap->script, liface); } - run_mapping(iface, liface, sizeof(liface), currmap); + liface = run_mapping(iface, liface, sizeof(liface), currmap); break; } } |