/* UDP send/receive module for secnet */
+/*
+ * This file is part of secnet.
+ * See README for full list of copyright holders.
+ *
+ * secnet is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version d of the License, or
+ * (at your option) any later version.
+ *
+ * secnet is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 3 along with secnet; if not, see
+ * https://www.gnu.org/licenses/gpl.html.
+ */
+
/* This module enables sites to communicate by sending UDP
* packets. When an instance of the module is created we can
* optionally bind to a particular local IP address (not implemented
struct udp {
struct udpcommon uc;
struct udpsocks socks;
+ bool_t addr_configured;
+ unsigned counter;
};
/*
int ix=ca->ix>=0 ? ca->ix : 0;
assert(ix>=0 && ix<socks->n_socks);
- snprintf(sbuf, sizeof(sbuf), "udp:%s%s-%s",
+ snprintf(sbuf, sizeof(sbuf), "udp#%u@l%d:%s%s-%s",
+ st->counter, st->uc.cc.loc.line,
iaddr_to_string(&socks->socks[ix].addr),
- ca->ix<0 ? "&" : "",
+ ca->ix<0 && socks->n_socks>1 ? "&" : "",
iaddr_to_string(&ca->ia));
return sbuf;
}
return 0;
}
+const char *af_name(int af)
+{
+ switch (af) {
+ case AF_INET6: return "IPv6";
+ case AF_INET: return "IPv4";
+ case 0: return "(any)";
+ default: abort();
+ }
+}
+
+void udp_sock_experienced(struct log_if *lg, struct udpcommon *uc,
+ struct udpsocks *socks, struct udpsock *us,
+ const union iaddr *dest, int af,
+ int r, int errnoval)
+{
+ bool_t success=r>=0;
+ if (us->experienced[!!dest][af][success]++)
+ return;
+ lg_perror(lg, uc->cc.cl.description, &uc->cc.loc,
+ success ? M_INFO : M_WARNING,
+ success ? 0 : errnoval,
+ "%s %s experiencing some %s %s%s%s%s%s%s",
+ socks->desc,iaddr_to_string(&us->addr),
+ success?"success":"trouble",
+ dest?"transmitting":"receiving",
+ af?" ":"", af?af_name(af):"",
+ dest?" (to ":"",
+ dest?iaddr_to_string(dest):"",
+ dest?")":"");
+}
+
static void udp_socks_afterpoll(void *state, struct pollfd *fds, int nfds)
{
struct udpsocks *socks=state;
struct commcommon *cc=&uc->cc;
for (i=0; i<socks->n_socks; i++) {
+ struct udpsock *us=&socks->socks[i];
if (i>=nfds) continue;
if (!(fds[i].revents & POLLIN)) continue;
- assert(fds[i].fd == socks->socks[i].fd);
- int fd=socks->socks[i].fd;
+ assert(fds[i].fd == us->fd);
+ int fd=us->fd;
do {
fromlen=sizeof(from);
BUF_ASSERT_FREE(cc->rbuf);
/* Check that the packet came from our poxy server;
we shouldn't be contacted directly by anybody else
(since they can trivially forge source addresses) */
- if (!iaddr_equal(&from,&uc->proxy)) {
+ if (!iaddr_equal(&from,&uc->proxy,False)) {
Message(M_INFO,"udp: received packet that's not "
"from the proxy\n");
BUF_FREE(cc->rbuf);
ca.ia=from;
ca.ix=i;
done=comm_notify(&cc->notify, cc->rbuf, &ca);
- if (!done) {
+ if (done) {
+ udp_sock_experienced(0,uc,socks,us,0,
+ from.sa.sa_family,0,0);
+ } else {
uint32_t msgtype;
if (cc->rbuf->size>12 /* prevents traffic amplification */
&& ((msgtype=get_uint32(cc->rbuf->start+8))
BUF_FREE(cc->rbuf);
}
BUF_ASSERT_FREE(cc->rbuf);
- } else {
+ } else { /* rv<=0 */
+ if (errno!=EINTR && !iswouldblock(errno))
+ udp_sock_experienced(0,uc,socks,us, 0,0, rv,errno);
BUF_FREE(cc->rbuf);
}
} while (rv>=0);
}
static bool_t udp_sendmsg(void *commst, struct buffer_if *buf,
- const struct comm_addr *dest)
+ const struct comm_addr *dest,
+ struct comm_clientinfo *clientinfo)
{
struct udp *st=commst;
struct udpcommon *uc=&st->uc;
uint8_t *sa;
if (uc->use_proxy) {
+ struct udpsock *us=&socks->socks[0];
sa=buf_prepend(buf,8);
if (dest->ia.sa.sa_family != AF_INET) {
Message(M_INFO,
memcpy(sa,&dest->ia.sin.sin_addr,4);
memset(sa+4,0,4);
memcpy(sa+6,&dest->ia.sin.sin_port,2);
- sendto(socks->socks[0].fd,sa,buf->size+8,0,&uc->proxy.sa,
+ int r=sendto(us->fd,sa,buf->size+8,0,&uc->proxy.sa,
iaddr_socklen(&uc->proxy));
+ udp_sock_experienced(0,uc,socks,us, &dest->ia,0, r,errno);
buf_unprepend(buf,8);
} else {
int i,r;
bool_t allunsupported=True;
+ int af=dest->ia.sa.sa_family;
for (i=0; i<socks->n_socks; i++) {
- if (dest->ia.sa.sa_family != socks->socks[i].addr.sa.sa_family)
+ struct udpsock *us=&socks->socks[i];
+ if (us->addr.sa.sa_family != af)
/* no point even trying */
continue;
- r=sendto(socks->socks[i].fd, buf->start, buf->size, 0,
+ r=sendto(us->fd, buf->start, buf->size, 0,
&dest->ia.sa, iaddr_socklen(&dest->ia));
+ udp_sock_experienced(0,uc,socks,us, &dest->ia,af, r,errno);
if (r>=0) return True;
if (!(errno==EAFNOSUPPORT || errno==ENETUNREACH))
/* who knows what that error means? */
return True;
}
-bool_t udp_make_socket(struct udpcommon *uc, struct udpsock *us,
- int failmsgclass)
+void udp_destroy_socket(struct udpcommon *uc, struct udpsock *us)
{
- const union iaddr *addr=&us->addr;
- struct commcommon *cc=&uc->cc;
- us->fd=-1;
+ if (us->fd>=0) {
+ close(us->fd);
+ us->fd=-1;
+ }
+}
#define FAIL_LG 0, cc->cl.description, &cc->loc, failmsgclass
#define FAIL(...) do{ \
goto failed; \
}while(0)
+static bool_t record_socket_gotaddr(struct udpcommon *uc, struct udpsock *us,
+ int failmsgclass)
+{
+ struct commcommon *cc=&uc->cc;
+ socklen_t salen=sizeof(us->addr);
+ int r=getsockname(us->fd,&us->addr.sa,&salen);
+ if (r) FAIL("getsockname()");
+ if (salen>sizeof(us->addr)) { errno=0; FAIL("getsockname() length"); }
+ return True;
+
+ failed:
+ return False;
+}
+
+bool_t udp_import_socket(struct udpcommon *uc, struct udpsock *us,
+ int failmsgclass, int fd)
+{
+ FILLZERO(us->experienced);
+ us->fd=fd;
+ return record_socket_gotaddr(uc,us,failmsgclass);
+}
+
+bool_t udp_make_socket(struct udpcommon *uc, struct udpsock *us,
+ int failmsgclass)
+{
+ const union iaddr *addr=&us->addr;
+ struct commcommon *cc=&uc->cc;
+ us->fd=-1;
+
+ FILLZERO(us->experienced);
us->fd=socket(addr->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
if (us->fd<0) FAIL("socket");
- if (fcntl(us->fd, F_SETFL, fcntl(us->fd, F_GETFL)|O_NONBLOCK)==-1)
- FAIL("fcntl(set O_NONBLOCK)");
+ setnonblock(us->fd);
setcloexec(us->fd);
#ifdef CONFIG_IPV6
if (addr->sa.sa_family==AF_INET6) {
if (uc->authbind) {
pid_t c;
int status;
+ char desc[200];
+ snprintf(desc,sizeof(desc),"authbind for %s: %s",
+ iaddr_to_string(addr), uc->authbind);
/* XXX this fork() and waitpid() business needs to be hidden
in some system-specific library functions. */
char *argv[5], addrstr[33], portstr[5];
const char *addrfam;
int port;
+ afterfork();
switch (addr->sa.sa_family) {
case AF_INET:
sprintf(addrstr,"%08lX",(long)addr->sin.sin_addr.s_addr);
if (errno==EINTR) continue;
FAIL("waitpid for authbind");
}
- if (WIFSIGNALED(status)) {
- lg_perror(FAIL_LG,0,"authbind died on signal %s (%d)",
- strsignal(WTERMSIG(status)),WTERMSIG(status));
- goto failed;
- }
- if (WIFEXITED(status) && WEXITSTATUS(status)!=0) {
- lg_perror(FAIL_LG,0,
- "authbind died with error exit status %d",
- WEXITSTATUS(status));
+ if (status) {
+ if (WIFEXITED(status) && WEXITSTATUS(status)<127) {
+ int es=WEXITSTATUS(status);
+ lg_perror(FAIL_LG,es,
+ "%s exited with error exit status %d;"
+ " indicates error",desc,es);
+ } else {
+ lg_exitstatus(FAIL_LG,status,desc);
+ }
goto failed;
}
} else {
if (bind(us->fd, &addr->sa, iaddr_socklen(addr))!=0)
FAIL("bind (%s)",iaddr_to_string(addr));
}
+
+ bool_t ok=record_socket_gotaddr(uc,us,failmsgclass);
+ if (!ok) goto failed;
+
return True;
failed:
- if (us->fd>=0) {
- close(us->fd);
- us->fd=-1;
- }
+ udp_destroy_socket(uc,us);
return False;
+}
#undef FAIL
+
+void udp_socks_register(struct udpcommon *uc, struct udpsocks *socks,
+ const char *desc)
+{
+ socks->uc=uc;
+ socks->desc=desc;
+ socks->interest=
+ register_for_poll(socks,udp_socks_beforepoll,udp_socks_afterpoll,"udp");
}
-void udp_socks_register(struct udpcommon *uc, struct udpsocks *socks)
+void udp_socks_deregister(struct udpcommon *uc, struct udpsocks *socks)
{
socks->uc=uc;
- register_for_poll(socks,udp_socks_beforepoll,udp_socks_afterpoll,"udp");
+ deregister_for_poll(socks->interest);
+}
+
+void udp_socks_childpersist(struct udpcommon *uc, struct udpsocks *socks)
+{
+ int i;
+ for (i=0; i<socks->n_socks; i++)
+ udp_destroy_socket(uc,&socks->socks[i]);
+}
+
+static void udp_childpersist_hook(void *sst, uint32_t new_phase)
+{
+ struct udp *st=sst;
+ udp_socks_childpersist(&st->uc,&st->socks);
}
static void udp_phase_hook(void *sst, uint32_t new_phase)
struct udpsocks *socks=&st->socks;
struct udpcommon *uc=&st->uc;
int i;
- for (i=0; i<socks->n_socks; i++)
- udp_make_socket(uc,&socks->socks[i],M_FATAL);
+ bool_t anydone=0;
+
+ for (i=0; i<socks->n_socks; i++) {
+ bool_t required=st->addr_configured
+ || (!anydone && i==socks->n_socks-1);
+ anydone += udp_make_socket(uc,&socks->socks[i],
+ required ? M_FATAL : M_WARNING);
+ }
+
+ udp_socks_register(uc,socks, uc->use_proxy ? "proxy" : "socket");
- udp_socks_register(uc,socks);
+ add_hook(PHASE_CHILDPERSIST,udp_childpersist_hook,st);
}
static list_t *udp_apply(closure_t *self, struct cloc loc, dict_t *context,
list_t *args)
{
+ static unsigned counter;
+
struct udp *st;
list_t *caddrl;
list_t *l;
struct udpsocks *socks=&st->socks;
struct commcommon *cc=&uc->cc;
+ st->counter=counter++;
+
union iaddr defaultaddrs[] = {
#ifdef CONFIG_IPV6
{ .sin6 = { .sin6_family=AF_INET6,
};
caddrl=dict_lookup(d,"address");
- socks->n_socks=caddrl ? list_length(caddrl) : (int)ARRAY_SIZE(defaultaddrs);
+ st->addr_configured=!!caddrl;
+ socks->n_socks=st->addr_configured ? list_length(caddrl)
+ : (int)ARRAY_SIZE(defaultaddrs);
if (socks->n_socks<=0 || socks->n_socks>UDP_MAX_SOCKETS)
cfgfatal(cc->loc,"udp","`address' must be 1..%d addresses",
UDP_MAX_SOCKETS);
for (i=0; i<socks->n_socks; i++) {
struct udpsock *us=&socks->socks[i];
- if (!list_length(caddrl)) {
+ if (!st->addr_configured) {
us->addr=defaultaddrs[i];
} else {
string_item_to_iaddr(list_elem(caddrl,i),uc->port,&us->addr,"udp");
~ianmdlvl / secnet.git / blobdiff