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Introduce socket tagging capabilities to the DNS resolver 

Internal bug: b/419200756
This commit is contained in:
Hazael Sanchez 2025-08-15 10:26:15 -07:00 committed by Pranav Kant
parent a557210c76
commit fdab32a92f
1 changed files with 9 additions and 0 deletions
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9
resolv/res_send.c
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@ -117,6 +117,13 @@
#define MAXPACKET 65536
#endif
static inline void tag_socket(int fd) {
#if defined(SO_NET_PROTOCOL_ID) && defined(PROTOCOL_ID_DNS)
int id = PROTOCOL_ID_DNS;
setsockopt(fd, SOL_SOCKET, SO_NET_PROTOCOL_ID, &id, sizeof(id));
#endif
}
/* From ev_streams.c. */
static inline void
@ -743,6 +750,7 @@ send_vc(res_state statp,
return (-1);
}
__set_errno (0);
tag_socket(statp->_vcsock);
if (connect(statp->_vcsock, nsap,
nsap->sa_family == AF_INET
? sizeof (struct sockaddr_in)
@ -945,6 +953,7 @@ reopen (res_state statp, int *terrno, int ns)
*terrno = errno;
return (-1);
}
tag_socket(EXT(statp).nssocks[ns]);
/*
* On a 4.3BSD+ machine (client and server,