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MFV r368746:

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Apply upstream fix 08968baec1122a58bb90d8f97ad948a75f8a5d69:

Fix error cases when udp-connect is set and send() returns an error

Obtained from:	unbound git
MFC after:	3 days
This commit is contained in:
Xin LI 2020-12-18 04:23:20 +00:00
commit 7341cb0cd1
4 changed files with 26 additions and 23 deletions
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2
contrib/unbound/services/authzone.c
View File

@ -6093,7 +6093,7 @@ xfr_probe_send_probe(struct auth_xfer* xfr, struct module_env* env,
/* send udp packet */
if(!comm_point_send_udp_msg(xfr->task_probe->cp, env->scratch_buffer,
(struct sockaddr*)&addr, addrlen)) {
(struct sockaddr*)&addr, addrlen, 0)) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));

15
contrib/unbound/services/outside_network.c
View File

@ -1870,17 +1870,10 @@ randomize_and_send_udp(struct pending* pend, sldns_buffer* packet, int timeout)
log_assert(pend->pc && pend->pc->cp);
/* send it over the commlink */
if(outnet->udp_connect) {
if(!comm_point_send_udp_msg(pend->pc->cp, packet, NULL, 0)) {
portcomm_loweruse(outnet, pend->pc);
return 0;
}
} else {
if(!comm_point_send_udp_msg(pend->pc->cp, packet,
(struct sockaddr*)&pend->addr, pend->addrlen)) {
portcomm_loweruse(outnet, pend->pc);
return 0;
}
if(!comm_point_send_udp_msg(pend->pc->cp, packet,
(struct sockaddr*)&pend->addr, pend->addrlen, outnet->udp_connect)) {
portcomm_loweruse(outnet, pend->pc);
return 0;
}
/* system calls to set timeout after sending UDP to make roundtrip

29
contrib/unbound/util/netevent.c
View File

@ -333,7 +333,7 @@ int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen)
/* send a UDP reply */
int
comm_point_send_udp_msg(struct comm_point *c, sldns_buffer* packet,
struct sockaddr* addr, socklen_t addrlen)
struct sockaddr* addr, socklen_t addrlen, int is_connected)
{
ssize_t sent;
log_assert(c->fd != -1);
@ -341,8 +341,8 @@ comm_point_send_udp_msg(struct comm_point *c, sldns_buffer* packet,
if(sldns_buffer_remaining(packet) == 0)
log_err("error: send empty UDP packet");
#endif
if(addr) {
log_assert(addr && addrlen > 0);
log_assert(addr && addrlen > 0);
if(!is_connected) {
sent = sendto(c->fd, (void*)sldns_buffer_begin(packet),
sldns_buffer_remaining(packet), 0,
addr, addrlen);
@ -367,9 +367,14 @@ comm_point_send_udp_msg(struct comm_point *c, sldns_buffer* packet,
#endif
int e;
fd_set_block(c->fd);
sent = sendto(c->fd, (void*)sldns_buffer_begin(packet),
sldns_buffer_remaining(packet), 0,
addr, addrlen);
if (!is_connected) {
sent = sendto(c->fd, (void*)sldns_buffer_begin(packet),
sldns_buffer_remaining(packet), 0,
addr, addrlen);
} else {
sent = send(c->fd, (void*)sldns_buffer_begin(packet),
sldns_buffer_remaining(packet), 0);
}
e = errno;
fd_set_nonblock(c->fd);
errno = e;
@ -378,8 +383,12 @@ comm_point_send_udp_msg(struct comm_point *c, sldns_buffer* packet,
if(sent == -1) {
if(!udp_send_errno_needs_log(addr, addrlen))
return 0;
verbose(VERB_OPS, "sendto failed: %s", sock_strerror(errno));
log_addr(VERB_OPS, "remote address is",
if (!is_connected) {
verbose(VERB_OPS, "sendto failed: %s", sock_strerror(errno));
} else {
verbose(VERB_OPS, "send failed: %s", sock_strerror(errno));
}
log_addr(VERB_OPS, "remote address is",
(struct sockaddr_storage*)addr, addrlen);
return 0;
} else if((size_t)sent != sldns_buffer_remaining(packet)) {
@ -754,7 +763,7 @@ comm_point_udp_callback(int fd, short event, void* arg)
buffer = rep.c->buffer;
#endif
(void)comm_point_send_udp_msg(rep.c, buffer,
(struct sockaddr*)&rep.addr, rep.addrlen);
(struct sockaddr*)&rep.addr, rep.addrlen, 0);
}
if(!rep.c || rep.c->fd != fd) /* commpoint closed to -1 or reused for
another UDP port. Note rep.c cannot be reused with TCP fd. */
@ -3901,7 +3910,7 @@ comm_point_send_reply(struct comm_reply *repinfo)
repinfo->addrlen, repinfo);
else
comm_point_send_udp_msg(repinfo->c, buffer,
(struct sockaddr*)&repinfo->addr, repinfo->addrlen);
(struct sockaddr*)&repinfo->addr, repinfo->addrlen, 0);
#ifdef USE_DNSTAP
if(repinfo->c->dtenv != NULL &&
repinfo->c->dtenv->log_client_response_messages)

3
contrib/unbound/util/netevent.h
View File

@ -633,10 +633,11 @@ void comm_point_drop_reply(struct comm_reply* repinfo);
* @param addr: where to send it to. If NULL, send is performed,
* for connected sockets, to the connected address.
* @param addrlen: length of addr.
* @param is_connected: if the UDP socket is connect()ed.
* @return: false on a failure.
*/
int comm_point_send_udp_msg(struct comm_point* c, struct sldns_buffer* packet,
struct sockaddr* addr, socklen_t addrlen);
struct sockaddr* addr, socklen_t addrlen,int is_connected);
/**
* Stop listening for input on the commpoint. No callbacks will happen.