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authorMike Frysinger2005-09-24 23:48:18 +0000
committerMike Frysinger2005-09-24 23:48:18 +0000
commitb7f88e01a4f590cd984860c693a9568e239ecdd1 (patch)
tree25c089dea90dbb522bd0ef68c743bcc653f2e8bd /networking/ipcalc.c
parenta630cb15b114ec3caa661c05ecbe993342c2be9f (diff)
downloadbusybox-b7f88e01a4f590cd984860c693a9568e239ecdd1.zip
busybox-b7f88e01a4f590cd984860c693a9568e239ecdd1.tar.gz
touchup argc/argv handling to shrink a bit and fix a segfault when given wrong number of parameters as noted and fixed by Cristian Ionescu-Idbohrn
Diffstat (limited to 'networking/ipcalc.c')
-rw-r--r--networking/ipcalc.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/networking/ipcalc.c b/networking/ipcalc.c
index bcd272b..c5f2ba1 100644
--- a/networking/ipcalc.c
+++ b/networking/ipcalc.c
@@ -100,18 +100,19 @@ int ipcalc_main(int argc, char **argv)
"mbn"
#endif
);
+
+ argc -= optind;
+ argv += optind;
if (mode & (BROADCAST | NETWORK | NETPREFIX)) {
- if (argc - optind > 2) {
+ if (argc > 2 || argc <= 0)
bb_show_usage();
- }
} else {
- if (argc - optind != 1) {
+ if (argc != 1)
bb_show_usage();
- }
}
#ifdef CONFIG_FEATURE_IPCALC_FANCY
- prefixstr = ipstr = argv[optind];
+ prefixstr = ipstr = argv[0];
while(*prefixstr) {
if (*prefixstr == '/') {
@@ -142,16 +143,16 @@ int ipcalc_main(int argc, char **argv)
}
ipaddr = inet_aton(ipstr, &a);
#else
- ipaddr = inet_aton(argv[optind], &a);
+ ipaddr = inet_aton(argv[0], &a);
#endif
if (ipaddr == 0) {
- IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]),
+ IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[0]),
exit(EXIT_FAILURE));
}
ipaddr = a.s_addr;
- if (argc - optind == 2) {
+ if (argc == 2) {
#ifdef CONFIG_FEATURE_IPCALC_FANCY
if (have_netmask) {
IPCALC_MSG(bb_error_msg_and_die("Both prefix and netmask were specified, use one or the other.\n"),
@@ -159,9 +160,9 @@ int ipcalc_main(int argc, char **argv)
}
#endif
- netmask = inet_aton(argv[optind + 1], &a);
+ netmask = inet_aton(argv[1], &a);
if (netmask == 0) {
- IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[optind + 1]),
+ IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[1]),
exit(EXIT_FAILURE));
}
netmask = a.s_addr;
@@ -200,7 +201,7 @@ int ipcalc_main(int argc, char **argv)
hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
if (!hostinfo) {
IPCALC_MSG(bb_herror_msg_and_die(
- "cannot find hostname for %s", argv[optind]),);
+ "cannot find hostname for %s", argv[0]),);
exit(EXIT_FAILURE);
}
for (x = 0; hostinfo->h_name[x]; x++) {