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iplink: Improve index parameter handling 

Correctly check for valid network device index supplied on
command line: indexes are always greather than zero. Check
for duplicate "index" argument.

Initialize @index to 0 to simplify handling it in iplink_modify().
Other callers (link_veth.c, iplink_vxcan.c) already did so.

No need to initialize ifi_index with 0 since it is already
initialized at the @struct req initialization time and not
modified in iplink_parse().

Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Serhey Popovych 2017-12-18 20:54:06 +02:00 committed by Stephen Hemminger
parent bd9cea5d8c
commit b7ea12ae43
1 changed files with 6 additions and 8 deletions
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14
ip/iplink.c
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@ -586,8 +586,10 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req,
*name = *argv;
} else if (strcmp(*argv, "index") == 0) {
NEXT_ARG();
if (*index)
duparg("index", *argv);
*index = atoi(*argv);
if (*index < 0)
if (*index <= 0)
invarg("Invalid \"index\" value", *argv);
} else if (matches(*argv, "link") == 0) {
NEXT_ARG();
@ -886,7 +888,7 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
char *name = NULL;
char *link = NULL;
char *type = NULL;
int index = -1;
int index = 0;
int group;
struct link_util *lu = NULL;
struct iplink_req req = {
@ -922,7 +924,6 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
return -1;
}
req.i.ifi_index = 0;
addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -2;
@ -936,7 +937,7 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
"Not enough information: \"dev\" argument is required.\n");
exit(-1);
}
if (cmd == RTM_NEWLINK && index != -1) {
if (cmd == RTM_NEWLINK && index) {
fprintf(stderr,
"index can be used only when creating devices.\n");
exit(-1);
@ -964,10 +965,7 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
}
if (index == -1)
req.i.ifi_index = 0;
else
req.i.ifi_index = index;
req.i.ifi_index = index;
}
if (name) {