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Merge pull request #6011 from cladmi/uhcpd_bind_to_device

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dist/tools/uhcpd: add an option to bind to device
This commit is contained in:
Alexandre Abadie 2016-11-10 13:32:53 +01:00 committed by GitHub
commit 04c23f376d
1 changed files with 28 additions and 1 deletions
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29
dist/tools/uhcpd/uhcpd.c vendored
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@ -20,6 +20,9 @@
char _prefix[16];
unsigned _prefix_len;
static const char *BIND_OPTION = "--bind-to-device";
static void bind_to_device(int sock, const char *interface);
int ipv6_addr_split(char *addr_str, char seperator, int _default)
{
char *sep = addr_str;
@ -39,9 +42,11 @@ int ipv6_addr_split(char *addr_str, char seperator, int _default)
int main(int argc, char *argv[])
{
static unsigned ifindex;
static unsigned _bind_to_device = 0;
if (argc < 3) {
fprintf(stderr, "usage: uhcpd <interface> <prefix/prefix_length>\n");
fprintf(stderr, "usage: uhcpd <interface> <prefix/prefix_length> [%s]\n",
BIND_OPTION);
exit(1);
}
@ -57,6 +62,14 @@ int main(int argc, char *argv[])
exit(1);
}
if (argc == 4) {
if (strcmp(BIND_OPTION, argv[3])) {
fprintf(stderr, "error: unkwown option\n");
exit(1);
}
_bind_to_device = 1;
}
char *addr_str = UHCP_MCAST_ADDR;
struct addrinfo hint;
@ -81,6 +94,10 @@ int main(int argc, char *argv[])
exit(1);
}
if (_bind_to_device) {
bind_to_device(sock, argv[1]);
}
if (bind(sock, mcast_addr->ai_addr, mcast_addr->ai_addrlen) < 0) {
perror("bind() failed");
exit(1);
@ -144,3 +161,13 @@ int udp_sendto(uint8_t *buf, size_t len, uint8_t *dst, uint16_t dst_port, uhcp_i
return res;
}
/* Requires to be 'root', I didn't find another solution for the moment */
static void bind_to_device(int sock, const char *interface)
{
if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
interface, IF_NAMESIZE) < 0 ) {
perror("setsockopt(SO_BINDTODEVICE) failed");
exit(1);
}
}