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Code Issues Releases Wiki Activity

pknock: pknlusr: remove dest_addr and rename src_addr

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We only need to specify the address at our end, and given that we are
receiving messages, not sending them, calling it `src_addr` is
misleading.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
This commit is contained in:
Jeremy Sowden
2020-10-25 14:15:48 +01:00
committed by Jan Engelhardt
parent b052ec0f7d
commit b05ea5644c
1 changed files with 8 additions and 20 deletions
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28
extensions/pknock/pknlusr.c
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@@ -12,7 +12,7 @@
#define GROUP 1 #define GROUP 1
static struct sockaddr_nl src_addr, dest_addr; static struct sockaddr_nl local_addr;
static int sock_fd; static int sock_fd;
static unsigned char *buf; static unsigned char *buf;
@@ -21,7 +21,6 @@ static struct xt_pknock_nl_msg *nlmsg;
int main(void) int main(void)
{ {
socklen_t addrlen;
int status; int status;
int group = GROUP; int group = GROUP;
@@ -37,24 +36,17 @@ int main(void)
return 1; return 1;
} }
memset(&src_addr, 0, sizeof(src_addr)); memset(&local_addr, 0, sizeof(local_addr));
src_addr.nl_family = AF_NETLINK; local_addr.nl_family = AF_NETLINK;
src_addr.nl_pid = getpid(); local_addr.nl_pid = getpid();
src_addr.nl_groups = group; local_addr.nl_groups = group;
status = bind(sock_fd, (struct sockaddr *)&local_addr, sizeof(local_addr));
status = bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr));
if (status == -1) { if (status == -1) {
close(sock_fd); close(sock_fd);
perror("bind()"); perror("bind()");
return 1; return 1;
} }
memset(&dest_addr, 0, sizeof(dest_addr));
dest_addr.nl_family = AF_NETLINK;
dest_addr.nl_pid = 0;
dest_addr.nl_groups = group;
buf_size = sizeof(struct xt_pknock_nl_msg) + sizeof(struct cn_msg) + sizeof(struct nlmsghdr); buf_size = sizeof(struct xt_pknock_nl_msg) + sizeof(struct cn_msg) + sizeof(struct nlmsghdr);
buf = malloc(buf_size); buf = malloc(buf_size);
@@ -63,16 +55,12 @@ int main(void)
return 1; return 1;
} }
addrlen = sizeof(dest_addr);
while(1) { while(1) {
memset(buf, 0, buf_size); memset(buf, 0, buf_size);
status = recv(sock_fd, buf, buf_size, 0);
status = recvfrom(sock_fd, buf, buf_size, 0, (struct sockaddr *)&dest_addr, &addrlen);
if (status <= 0) { if (status <= 0) {
perror("recvfrom()"); perror("recv()");
return 1; return 1;
} }
nlmsg = (struct xt_pknock_nl_msg *)(buf + sizeof(struct cn_msg) + sizeof(struct nlmsghdr)); nlmsg = (struct xt_pknock_nl_msg *)(buf + sizeof(struct cn_msg) + sizeof(struct nlmsghdr));