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Add socket_bindtodevice function to Nbase.

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The Linux-specific SO_BINDTODEVICE sockopt causes packets to be sent on
a specific interface, in cases where merely setting the source address
does not uniquely determine the interface.
This commit is contained in:
david
2012-10-03 15:43:22 +00:00
parent a53e00afa1
commit 6ec453e4e8
2 changed files with 13 additions and 0 deletions
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1
nbase/nbase.h
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@@ -459,6 +459,7 @@ int inheritable_socket(int af, int style, int protocol);
int dup_socket(int sd); int dup_socket(int sd);
int unblock_socket(int sd); int unblock_socket(int sd);
int block_socket(int sd); int block_socket(int sd);
int socket_bindtodevice(int sd, const char *device);
/* CRC32 Cyclic Redundancy Check */ /* CRC32 Cyclic Redundancy Check */
unsigned long nbase_crc32(unsigned char *buf, int len); unsigned long nbase_crc32(unsigned char *buf, int len);

12
nbase/nbase_misc.c
View File

@@ -281,6 +281,18 @@ int block_socket(int sd) {
return 1; return 1;
} }
/* Use the SO_BINDTODEVICE sockopt to bind with a specific interface (Linux
only). Pass NULL or an empty string to remove device binding. */
int socket_bindtodevice(int sd, const char *device) {
#ifdef SO_BINDTODEVICE
/* Linux-specific sockopt asking to use a specific interface. See socket(7). */
if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) < 0)
return 0;
#endif
return 1;
}
/* Convert a time specification into a count of seconds. A time specification is /* Convert a time specification into a count of seconds. A time specification is
* a non-negative real number, possibly followed by a units suffix. The suffixes * a non-negative real number, possibly followed by a units suffix. The suffixes
* are "ms" for milliseconds, "s" for seconds, "m" for minutes, or "h" for * are "ms" for milliseconds, "s" for seconds, "m" for minutes, or "h" for