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*: fix SO_BINDTODEVICE. Kernel wants at least IFNAMSIZ bytes there.

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This commit is contained in:
Denis Vlasenko 2008-12-10 11:12:16 +00:00
parent 0d94820adf
commit e53738558f
5 changed files with 21 additions and 6 deletions
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1
include/libbb.h
View File

@ -437,6 +437,7 @@ ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
* Turn it on before you call bind(). */
void setsockopt_reuseaddr(int fd) FAST_FUNC; /* On Linux this never fails. */
int setsockopt_broadcast(int fd) FAST_FUNC;
int setsockopt_bindtodevice(int fd, const char *iface) FAST_FUNC;
/* NB: returns port in host byte order */
unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port) FAST_FUNC;
typedef struct len_and_sockaddr {

15
libbb/xconnect.c
View File

@ -8,6 +8,7 @@
*/
#include <netinet/in.h>
#include <net/if.h>
#include "libbb.h"
void FAST_FUNC setsockopt_reuseaddr(int fd)
@ -18,6 +19,20 @@ int FAST_FUNC setsockopt_broadcast(int fd)
{
return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
}
int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
{
int r;
struct ifreq ifr;
strncpy_IFNAMSIZ(ifr.ifr_name, iface);
/* Actually, ifr_name is at offset 0, and in practice
* just giving char[IFNAMSIZ] instead of struct ifreq works too.
* But just in case it's not true on some obscure arch... */
r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
if (r)
bb_perror_msg("can't bind to interface %s", iface);
return r;
}
void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
{

3
networking/arping.c
View File

@ -331,8 +331,7 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
struct sockaddr_in saddr;
int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1)
bb_perror_msg("cannot bind to device %s", device);
setsockopt_bindtodevice(probe_fd, device);
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
if (src.s_addr) {

4
networking/ping.c
View File

@ -572,7 +572,7 @@ static void ping4(len_and_sockaddr *lsa)
xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
}
if (str_I)
setsockopt(pingsock, SOL_SOCKET, SO_BINDTODEVICE, str_I, strlen(str_I) + 1);
setsockopt_bindtodevice(pingsock, str_I);
/* enable broadcast pings */
setsockopt_broadcast(pingsock);
@ -622,7 +622,7 @@ static void ping6(len_and_sockaddr *lsa)
if (source_lsa)
xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
if (str_I)
setsockopt(pingsock, SOL_SOCKET, SO_BINDTODEVICE, str_I, strlen(str_I) + 1);
setsockopt_bindtodevice(pingsock, str_I);
#ifdef ICMP6_FILTER
{

4
networking/udhcp/socket.c
View File

@ -98,8 +98,8 @@ int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
bb_perror_msg_and_die("SO_BROADCAST");
/* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &inf, strlen(inf) + 1) == -1)
bb_perror_msg_and_die("SO_BINDTODEVICE");
if (setsockopt_bindtodevice(fd, inf))
xfunc_die(); /* warning is already printed */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;