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Fix route.sh & arp.sh
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Fix route.sh & arp.sh and some misc cleanup
Check for fp NULL, review comment by Serge.
Temporary fix to remove "linkdown" from route output, because we do not
handle it in net_route.c yet. This will allow route.sh to succeed.

Signed-off-by: Anjali Kulkarni <[email protected]>
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@anjalidk
anjalidk committed Feb 5, 2024
1 parent 41b251a commit 95423a7
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Showing 5 changed files with 74 additions and 62 deletions.
42 changes: 27 additions & 15 deletions net_arp.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -173,13 +173,17 @@ static int handle_arp_resp(int net_sock, void **out)
struct rtattr *at[NDA_MAX + 1], *rta;
struct arp_info *arps = NULL, *iarps = NULL;
struct sockaddr_nl nladdr;
unsigned int type, family;
#ifdef TESTING
FILE *fp = NULL;
fp = fopen ("./arp_info.txt", "w");
if (!fp)
FILE *fp;
fp = fopen("./arp_info.txt", "w");
if (!fp) {
eprintf("Error opening file arp_info.txt with errno: %d", errno);
return -1;
}
#endif

memset(&msg, 0, sizeof(msg));
msg.msg_name = &nladdr;
msg.msg_namelen = sizeof(nladdr);
msg.msg_iov = &iov;
Expand All @@ -200,6 +204,7 @@ static int handle_arp_resp(int net_sock, void **out)
ret = -1;
goto out;
}
memset(&iov, 0, sizeof(iov));
iov.iov_base = buf;
iov.iov_len = len;
max_arp = get_max_arp(len);
Expand All @@ -211,7 +216,7 @@ static int handle_arp_resp(int net_sock, void **out)
if (arps)
free(arps);
free(buf);
ret = -1;
ret = -ENOMEM;
goto out;
}
arps = tmp;
Expand All @@ -223,8 +228,7 @@ static int handle_arp_resp(int net_sock, void **out)
free(arps);
free(buf);
eprintf("Error in response recvmsg(), errno %d\n", err);
errno = err;
ret = -1;
ret = -err;
goto out;
}
#ifdef PRINTLOGS
Expand All @@ -239,8 +243,7 @@ static int handle_arp_resp(int net_sock, void **out)
ecount++;
free(buf);
free(arps);
errno = nlmsg_err->error;
ret = -1;
ret = -(nlmsg_err->error);
goto out;
} else if (r->nlmsg_type == NLMSG_DONE) {
#ifdef PRINTLOGS
Expand All @@ -265,24 +268,33 @@ static int handle_arp_resp(int net_sock, void **out)
len -= NLMSG_LENGTH(sizeof(*nd_msg));
if (len < 0) {
eprintf("nlmsg_len incorrect");
errno = EINVAL;
free(buf);
free(arps);
ret = -1;
ret = -EINVAL;
goto out;
}
#ifdef PRINTLOGS
printf("len after sub %ld is %d\n",sizeof(*nd_msg), len);
#endif
rta = ((struct rtattr *) (((char *) (nd_msg)) + NLMSG_ALIGN(sizeof(struct ndmsg))));
parse_attr(at, rta, len);
family = nd_msg->ndm_family;
type = nd_msg->ndm_type;
if (family == AF_INET || family == AF_INET6) {
if ((type == RTN_BROADCAST) ||
(type == RTN_MULTICAST) ||
(type == RTN_LOCAL)) {
r = NLMSG_NEXT(r, recvl);
continue;
}
#ifdef TESTING
get_attr(at, iarps, nd_msg, fp);
get_attr(at, iarps, nd_msg, fp);
#else
get_attr(at, iarps, nd_msg);
get_attr(at, iarps, nd_msg);
#endif
iarps++;
aind++;
iarps++;
aind++;
}
r = NLMSG_NEXT(r, recvl);
count++;
}
Expand Down Expand Up @@ -314,7 +326,7 @@ int get_net_arp(void **out)
}

err = handle_arp_resp(net_sock, out);
if (err == -1) {
if (err < 0) {
close(net_sock);
return -1;
}
Expand Down
67 changes: 41 additions & 26 deletions net_route.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ static int send_route_req(int net_sock)
req.nl_hdr.nlmsg_seq = 0;

req.rt.rtm_family = AF_INET;
req.rt.rtm_table = RT_TABLE_MAIN;

err = send(net_sock, &req, req.nl_hdr.nlmsg_len, 0);
if (err == -1) {
Expand All @@ -73,6 +74,7 @@ static int send_route_req(int net_sock)
#ifdef TESTING
#define IPA_F "%hhu.%hhu.%hhu.%hhu"
#define IPA_V(str) str[0], str[1], str[2], str[3]
#define V4_PREFIX_LEN 32

static inline bool is_zero(char *str, int len)
{
Expand Down Expand Up @@ -118,7 +120,8 @@ static void print_rt_info(struct rt_info *rt, FILE *fp)
fprintf(fp, "default");
} else {
fprintf(fp, IPA_F, IPA_V(rt->dest));
fprintf(fp, "/%02hhu", rt->dst_prefix_len);
if (rt->dst_prefix_len != V4_PREFIX_LEN)
fprintf(fp, "/%02hhu", rt->dst_prefix_len);
}
if (!is_zero(rt->gate, MAX_BYTES_IPV4)) {
fprintf(fp, " via ");
Expand All @@ -132,7 +135,10 @@ static void print_rt_info(struct rt_info *rt, FILE *fp)
fprintf(fp, " src ");
fprintf(fp, IPA_F, IPA_V(rt->prefsrc));
}
fprintf(fp, " metric %d \n", rt->metric);
if (rt->metric != 0)
fprintf(fp, " metric %d \n", rt->metric);
else
fprintf(fp, " \n");
}
}
#endif
Expand Down Expand Up @@ -248,8 +254,16 @@ static int handle_route_resp(int net_sock, void **out)
struct rtattr *at[RTA_MAX + 1];
struct rt_info *routes = NULL, *iroutes = NULL;
struct sockaddr_nl nladdr;
unsigned int family;
int ret = 0;

#ifdef TESTING
FILE *fp = NULL;
FILE *fp;
fp = fopen("./route_info.txt", "w");
if (!fp) {
eprintf("Error opening file route_info.txt with errno: %d", errno);
return -1;
}
#endif

memset(&msg, 0, sizeof(msg));
Expand All @@ -263,13 +277,15 @@ static int handle_route_resp(int net_sock, void **out)
if (len == -1) {
if (routes)
free(routes);
return -1;
ret = -1;
goto out;
}
char *buf = (char *)malloc(len);
if (!buf) {
if (routes)
free(routes);
return -1;
ret = -1;
goto out;
}
memset(&iov, 0, sizeof(iov));
iov.iov_base = buf;
Expand All @@ -283,7 +299,8 @@ static int handle_route_resp(int net_sock, void **out)
if (routes)
free(routes);
free(buf);
return -1;
ret = -ENOMEM;
goto out;
}
routes = tmp;
iroutes = routes + rtind;
Expand All @@ -294,8 +311,8 @@ static int handle_route_resp(int net_sock, void **out)
free(routes);
free(buf);
eprintf("Error in response recvmsg(), errno %d\n", err);
errno = err;
return -1;
ret = -err;
goto out;
}
#ifdef PRINTLOGS
printf("received len %d\n",recvl);
Expand All @@ -309,19 +326,16 @@ static int handle_route_resp(int net_sock, void **out)
ecount++;
free(buf);
free(routes);
errno = nlmsg_err->error;
return -1;
ret = -(nlmsg_err->error);
goto out;
} else if (r->nlmsg_type == NLMSG_DONE) {
#ifdef PRINTLOGS
printf("DONE\n");
#endif
free(buf);
*(struct rt_info **)out = routes;
#ifdef TESTING
if (fp)
fclose(fp);
#endif
return rtind;
ret = rtind;
goto out;
}
rt = (struct rtmsg *)NLMSG_DATA(r);
len = r->nlmsg_len;
Expand All @@ -338,31 +352,30 @@ static int handle_route_resp(int net_sock, void **out)
len -= NLMSG_LENGTH(sizeof(*rt));
if (len < 0) {
eprintf("nlmsg_len incorrect");
errno = EINVAL;
free(buf);
free(routes);
return -1;
ret = -EINVAL;
goto out;
}
#ifdef PRINTLOGS
printf("len after sub %lu is %d\n",sizeof(*rt), len);
#endif
parse_attr(at, RTM_RTA(rt), len);
if (rt->rtm_family == AF_INET || rt->rtm_family == AF_INET6) {
family = rt->rtm_family;
if (family == AF_INET || family == AF_INET6) {
if ((rt->rtm_type == RTN_BROADCAST) ||
(rt->rtm_type == RTN_MULTICAST))
(rt->rtm_type == RTN_MULTICAST) ||
(rt->rtm_type == RTN_LOCAL)) {
r = NLMSG_NEXT(r, recvl);
continue;
}

get_attr(at, iroutes, rt);
#ifdef TESTING
fp = fopen ("./route_info.txt", "w");
print_rt_info(iroutes, fp);
#endif
iroutes++;
rtind++;
} else {
#ifdef PRINTLOGS
printf("Family is %d\n",rt->rtm_family);
#endif
}
r = NLMSG_NEXT(r, recvl);
count++;
Expand All @@ -373,11 +386,13 @@ static int handle_route_resp(int net_sock, void **out)
#endif
}
*(struct rt_info **)out = routes;
ret = rtind;
out:
#ifdef TESTING
if (fp)
fclose(fp);
#endif
return rtind;
return ret;
}

int get_net_route(void **out)
Expand All @@ -394,7 +409,7 @@ int get_net_route(void **out)
}

err = handle_route_resp(net_sock, out);
if (err == -1) {
if (err < 0) {
close(net_sock);
return -1;
}
Expand Down
20 changes: 0 additions & 20 deletions resmem_cg.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -51,21 +51,6 @@ int get_info_infile(char *fname, char *res, void *out)
return 0;
}

/*static inline void scan_mem_str(str, info, res)
{
char *loc = NULL;
loc = strstr(buf, str);
if (loc == NULL) {
eprintf("%s is not found in file %s", str, MEMINFO_FILE);
res->res_unit[i]->status = ENODATA;
} else {
sscanf(loc, "%*s%zu", &info);
(res->res_unit[i]->data).sz = info;
res->res_unit[i]->status = RES_STATUS_FILLED;
}
}*/

/* read information from a cgroup file.
*/
static inline size_t cgmemread(char *cg, char *name, char *elem)
Expand Down Expand Up @@ -182,8 +167,6 @@ int getmeminfo_cg(int res_id, void *out, size_t sz, void **hint, int pid, int fl
int populate_meminfo_cg(res_blk_t *res, int pid, int flags)
{
char *cg;
char buf[MEMBUF_2048];
int err;

cg = get_cgroup(pid, MEMCGNAME);
if (!cg) {
Expand All @@ -193,9 +176,6 @@ int populate_meminfo_cg(res_blk_t *res, int pid, int flags)

clean_init(cg);

if ((err = file_to_buf(MEMINFO_FILE, buf, MEMBUF_2048)) < 0)
return err;

for (int i = 0; i < res->res_count; i++) {
switch (res->res_unit[i]->res_id) {
case RES_MEM_FREE:
Expand Down
5 changes: 4 additions & 1 deletion tests/ROUTE/route.sh
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,12 @@ export LD_LIBRARY_PATH=`git rev-parse --show-toplevel`
cd $LD_LIBRARY_PATH
cd tests/ROUTE
rm -f ./route_test
cc -I $LD_LIBRARY_PATH -std=gnu99 -o route_test route_test.c -L $LD_LIBRARY_PATH -lresource
rm -f ./route_info.orig
rm -f ./route_info.txt
cc -I $LD_LIBRARY_PATH -std=gnu99 -o route_test route_test.c -L $LD_LIBRARY_PATH -lresource
ip route > ./route_info.orig
# Temporary fix to remove "linkdown" from route output, because we do not
# handle it in net_route.c yet. This will allow route.sh to succeed.
sed -i 's/ linkdown//g' route_info.orig
./route_test
diff ./route_info.orig ./route_info.txt
2 changes: 2 additions & 0 deletions tests/ROUTE/route_test.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -32,12 +32,14 @@ int main(int argc, char **argv)
exit(1);
}
rtn = rt;
#ifdef PRINTLOGS
for (int i=0;i<nroutes; i++) {
if (rt->dst_prefix_len != 0) {
printf("%hhu.%hhu.%hhu.%hhu/%02hhu\n",rt->dest[0], rt->dest[1], rt->dest[2], rt->dest[3], rt->dst_prefix_len);
}
rt++;
}
#endif
if (rtn)
free(rtn);
exit(0);
Expand Down

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