#include <netinet/in.h>
#include <arpa/inet.h>
#include "util.h"
+#include "magic.h"
#include "unaligned.h"
#include "ipaddr.h"
#include "magic.h"
closure_t cl;
struct comm_if ops;
struct cloc loc;
- uint32_t addr;
- uint16_t port;
+ union iaddr addr;
int fd;
string_t authbind;
struct buffer_if *rbuf;
struct notify_list *notify;
bool_t use_proxy;
- struct sockaddr_in proxy;
+ union iaddr proxy;
};
-static const char *saddr_to_string(const struct sockaddr_in *sin) {
- static char bufs[2][100];
- static int b;
-
- b ^= 1;
- snprintf(bufs[b], sizeof(bufs[b]), "[%s]:%d",
- inet_ntoa(sin->sin_addr),
- ntohs(sin->sin_port));
- return bufs[b];
-}
-
static const char *addr_to_string(void *commst, const struct comm_addr *ca) {
struct udp *st=commst;
static char sbuf[100];
- struct sockaddr_in la;
- la.sin_addr.s_addr=htonl(st->addr);
- la.sin_port=htons(st->port);
-
snprintf(sbuf, sizeof(sbuf), "udp:%s-%s",
- saddr_to_string(&la), saddr_to_string(&ca->sin));
+ iaddr_to_string(&st->addr), iaddr_to_string(&ca->ia));
return sbuf;
}
static void udp_afterpoll(void *state, struct pollfd *fds, int nfds)
{
struct udp *st=state;
- struct sockaddr_in from;
+ union iaddr from;
socklen_t fromlen;
struct notify_list *n;
bool_t done;
if (nfds && (fds->revents & POLLIN)) {
do {
- FILLZERO(from);
fromlen=sizeof(from);
BUF_ASSERT_FREE(st->rbuf);
BUF_ALLOC(st->rbuf,"udp_afterpoll");
- rv=recvfrom(st->fd, st->rbuf->start, st->rbuf->len, 0,
- (struct sockaddr *)&from, &fromlen);
+ buffer_init(st->rbuf,calculate_max_start_pad());
+ rv=recvfrom(st->fd, st->rbuf->start,
+ buf_remaining_space(st->rbuf),
+ 0, &from.sa, &fromlen);
if (rv>0) {
st->rbuf->size=rv;
if (st->use_proxy) {
/* 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 (memcmp(&from.sin_addr,&st->proxy.sin_addr,4)!=0 ||
- memcmp(&from.sin_port,&st->proxy.sin_port,2)!=0) {
+ if (!iaddr_equal(&from,&st->proxy)) {
Message(M_INFO,"udp: received packet that's not "
"from the proxy\n");
BUF_FREE(st->rbuf);
continue;
}
- memcpy(&from.sin_addr,buf_unprepend(st->rbuf,4),4);
+ /* proxy protocol supports ipv4 transport only */
+ from.sa.sa_family=AF_INET;
+ memcpy(&from.sin.sin_addr,buf_unprepend(st->rbuf,4),4);
buf_unprepend(st->rbuf,2);
- memcpy(&from.sin_port,buf_unprepend(st->rbuf,2),2);
+ memcpy(&from.sin.sin_port,buf_unprepend(st->rbuf,2),2);
}
struct comm_addr ca;
- FILLZERO(ca);
ca.comm=&st->ops;
- ca.sin=from;
+ ca.ia=from;
done=False;
for (n=st->notify; n; n=n->next) {
if (n->fn(n->state, st->rbuf, &ca)) {
if (st->use_proxy) {
sa=buf_prepend(buf,8);
- memcpy(sa,&dest->sin.sin_addr,4);
+ if (dest->ia.sa.sa_family != AF_INET) {
+ Message(M_INFO,
+ "udp: proxy means dropping outgoing non-IPv4 packet to %s\n",
+ iaddr_to_string(&dest->ia));
+ return False;
+ }
+ memcpy(sa,&dest->ia.sin.sin_addr,4);
memset(sa+4,0,4);
- memcpy(sa+6,&dest->sin.sin_port,2);
- sendto(st->fd,sa,buf->size+8,0,(struct sockaddr *)&st->proxy,
- sizeof(st->proxy));
+ memcpy(sa+6,&dest->ia.sin.sin_port,2);
+ sendto(st->fd,sa,buf->size+8,0,&st->proxy.sa,
+ iaddr_socklen(&st->proxy));
buf_unprepend(buf,8);
} else {
sendto(st->fd, buf->start, buf->size, 0,
- (struct sockaddr *)&dest->sin, sizeof(dest->sin));
+ &dest->ia.sa, iaddr_socklen(&dest->ia));
}
return True;
static void udp_phase_hook(void *sst, uint32_t new_phase)
{
struct udp *st=sst;
- struct sockaddr_in addr;
+ union iaddr addr;
st->fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (st->fd<0) {
fatal_perror("udp (%s:%d): fcntl(set O_NONBLOCK)",
st->loc.file,st->loc.line);
}
- if (fcntl(st->fd, F_SETFD, FD_CLOEXEC)==-1) {
- fatal_perror("udp (%s:%d): fcntl(set FD_CLOEXEC)",
- st->loc.file,st->loc.line);
- }
+ setcloexec(st->fd);
- FILLZERO(addr);
- addr.sin_family=AF_INET;
- addr.sin_addr.s_addr=htonl(st->addr);
- addr.sin_port=htons(st->port);
+ addr=st->addr;
if (st->authbind) {
pid_t c;
int status;
}
if (c==0) {
char *argv[4], addrstr[9], portstr[5];
- sprintf(addrstr,"%08lX",(long)addr.sin_addr.s_addr);
- sprintf(portstr,"%04X",addr.sin_port);
+ switch (addr.sa.sa_family) {
+ case AF_INET:
+ sprintf(addrstr,"%08lX",(long)addr.sin.sin_addr.s_addr);
+ sprintf(portstr,"%04X",addr.sin.sin_port);
+ break;
+ default:
+ fatal("udp (%s:%d): unsupported address family for authbind",
+ st->loc.file,st->loc.line);
+ }
argv[0]=st->authbind;
argv[1]=addrstr;
argv[2]=portstr;
st->loc.line, WEXITSTATUS(status));
}
} else {
- if (bind(st->fd, (struct sockaddr *)&addr, sizeof(addr))!=0) {
+ if (bind(st->fd, &addr.sa, iaddr_socklen(&addr))!=0) {
fatal_perror("udp (%s:%d): bind",st->loc.file,st->loc.line);
}
}
st->ops.release_notify=release_notify;
st->ops.sendmsg=udp_sendmsg;
st->ops.addr_to_string=addr_to_string;
- st->port=0;
st->use_proxy=False;
i=list_elem(args,0);
}
d=i->data.dict;
+ st->addr.sa.sa_family=AF_INET;
j=dict_find_item(d,"address",False,"udp",st->loc);
- st->addr=j?string_item_to_ipaddr(j, "udp"):INADDR_ANY;
- st->port=dict_read_number(d,"port",True,"udp",st->loc,0);
+ st->addr.sin.sin_addr.s_addr=j?string_item_to_ipaddr(j, "udp"):INADDR_ANY;
+ st->addr.sin.sin_port=dict_read_number(d,"port",True,"udp",st->loc,0);
st->rbuf=find_cl_if(d,"buffer",CL_BUFFER,True,"udp",st->loc);
st->authbind=dict_read_string(d,"authbind",False,"udp",st->loc);
l=dict_lookup(d,"proxy");
if (l) {
st->use_proxy=True;
- FILLZERO(st->proxy);
- st->proxy.sin_family=AF_INET;
+ st->proxy.sa.sa_family=AF_INET;
i=list_elem(l,0);
if (!i || i->type!=t_string) {
cfgfatal(st->loc,"udp","proxy must supply ""addr"",port\n");
}
a=string_item_to_ipaddr(i,"proxy");
- st->proxy.sin_addr.s_addr=htonl(a);
+ st->proxy.sin.sin_addr.s_addr=htonl(a);
i=list_elem(l,1);
if (!i || i->type!=t_number) {
cfgfatal(st->loc,"udp","proxy must supply ""addr"",port\n");
}
- st->proxy.sin_port=htons(i->data.number);
+ st->proxy.sin.sin_port=htons(i->data.number);
}
update_max_start_pad(&comm_max_start_pad, st->use_proxy ? 8 : 0);
~ian / secnet.git / blobdiff