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-rw-r--r--networking/ifupdown.c18
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;
}
}