transform: split out transform-common.h

[secnet.git] / udp.c

diff --git a/udp.c b/udp.c
index add7d8d726c5392267a99cce92d5697e4c890aaa..bbf8c64163dbd8815001493c90a12d8f8cac30c9 100644 (file)
--- a/udp.c
+++ b/udp.c
@@ -16,6 +16,8 @@
 #include <errno.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
 #include "util.h"
 #include "unaligned.h"
 #include "ipaddr.h"
@@ -36,6 +38,7 @@ struct udp {
     closure_t cl;
     struct comm_if ops;
     struct cloc loc;
+    uint32_t addr;
     uint16_t port;
     int fd;
     string_t authbind;
@@ -45,9 +48,32 @@ struct udp {
     struct sockaddr_in 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));
+    return sbuf;
+}
+
 static int udp_beforepoll(void *state, struct pollfd *fds, int *nfds_io,
-                         int *timeout_io, const struct timeval *tv,
-                         uint64_t *now)
+                         int *timeout_io)
 {
     struct udp *st=state;
     if (*nfds_io<1) {
@@ -60,18 +86,18 @@ static int udp_beforepoll(void *state, struct pollfd *fds, int *nfds_io,
     return 0;
 }
 
-static void udp_afterpoll(void *state, struct pollfd *fds, int nfds,
-                         const struct timeval *tv, uint64_t *now)
+static void udp_afterpoll(void *state, struct pollfd *fds, int nfds)
 {
     struct udp *st=state;
     struct sockaddr_in from;
-    int fromlen;
+    socklen_t fromlen;
     struct notify_list *n;
     bool_t done;
     int rv;
 
     if (nfds && (fds->revents & POLLIN)) {
        do {
+           FILLZERO(from);
            fromlen=sizeof(from);
            BUF_ASSERT_FREE(st->rbuf);
            BUF_ALLOC(st->rbuf,"udp_afterpoll");
@@ -96,7 +122,11 @@ static void udp_afterpoll(void *state, struct pollfd *fds, int nfds,
                }
                done=False;
                for (n=st->notify; n; n=n->next) {
-                   if (n->fn(n->state, st->rbuf, &from)) {
+                   struct comm_addr ca;
+                   FILLZERO(ca);
+                   ca.comm=&st->ops;
+                   ca.sin=from;
+                   if (n->fn(n->state, st->rbuf, &ca)) {
                        done=True;
                        break;
                    }
@@ -157,21 +187,21 @@ static void release_notify(void *commst, void *nst, comm_notify_fn *fn)
 }
 
 static bool_t udp_sendmsg(void *commst, struct buffer_if *buf,
-                         struct sockaddr_in *dest)
+                         const struct comm_addr *dest)
 {
     struct udp *st=commst;
     uint8_t *sa;
 
     if (st->use_proxy) {
        sa=buf->start-8;
-       memcpy(sa,&dest->sin_addr,4);
+       memcpy(sa,&dest->sin.sin_addr,4);
        memset(sa+4,0,4);
-       memcpy(sa+6,&dest->sin_port,2);
+       memcpy(sa+6,&dest->sin.sin_port,2);
        sendto(st->fd,sa,buf->size+8,0,(struct sockaddr *)&st->proxy,
               sizeof(st->proxy));
     } else {
        sendto(st->fd, buf->start, buf->size, 0,
-              (struct sockaddr *)dest, sizeof(*dest));
+              (struct sockaddr *)&dest->sin, sizeof(dest->sin));
     }
 
     return True;
@@ -182,7 +212,7 @@ static void udp_phase_hook(void *sst, uint32_t new_phase)
     struct udp *st=sst;
     struct sockaddr_in addr;
 
-    st->fd=socket(AF_INET, SOCK_DGRAM, 0);
+    st->fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
     if (st->fd<0) {
        fatal_perror("udp (%s:%d): socket",st->loc.file,st->loc.line);
     }
@@ -195,8 +225,9 @@ static void udp_phase_hook(void *sst, uint32_t new_phase)
                     st->loc.file,st->loc.line);
     }
 
-    memset(&addr, 0, sizeof(addr));
+    FILLZERO(addr);
     addr.sin_family=AF_INET;
+    addr.sin_addr.s_addr=htonl(st->addr);
     addr.sin_port=htons(st->port);
     if (st->authbind) {
        pid_t c;
@@ -209,23 +240,29 @@ static void udp_phase_hook(void *sst, uint32_t new_phase)
            fatal_perror("udp_phase_hook: fork() for authbind");
        }
        if (c==0) {
-           char *argv[4];
+           char *argv[4], addrstr[9], portstr[5];
+           sprintf(addrstr,"%08lX",(long)addr.sin_addr.s_addr);
+           sprintf(portstr,"%04X",addr.sin_port);
            argv[0]=st->authbind;
-           argv[1]=strdup("00000000");
-           if (!argv[1]) exit(ENOMEM);
-           argv[2]=alloca(8);
-           if (!argv[2]) exit(ENOMEM);
-           sprintf(argv[2],"%04X",htons(st->port));
+           argv[1]=addrstr;
+           argv[2]=portstr;
            argv[3]=NULL;
            dup2(st->fd,0);
            execvp(st->authbind,argv);
-           exit(ENOEXEC);
+           _exit(255);
        }
-       waitpid(c,&status,0);
-       if (WEXITSTATUS(status)!=0) {
-           errno=WEXITSTATUS(status);
+       while (waitpid(c,&status,0)==-1) {
+           if (errno==EINTR) continue;
            fatal_perror("udp (%s:%d): authbind",st->loc.file,st->loc.line);
        }
+       if (WIFSIGNALED(status)) {
+           fatal("udp (%s:%d): authbind died on signal %d",st->loc.file,
+                 st->loc.line, WTERMSIG(status));
+       }
+       if (WIFEXITED(status) && WEXITSTATUS(status)!=0) {
+           fatal("udp (%s:%d): authbind died with status %d",st->loc.file,
+                 st->loc.line, WEXITSTATUS(status));
+       }
     } else {
        if (bind(st->fd, (struct sockaddr *)&addr, sizeof(addr))!=0) {
            fatal_perror("udp (%s:%d): bind",st->loc.file,st->loc.line);
@@ -239,7 +276,7 @@ static list_t *udp_apply(closure_t *self, struct cloc loc, dict_t *context,
                         list_t *args)
 {
     struct udp *st;
-    item_t *i;
+    item_t *i,*j;
     dict_t *d;
     list_t *l;
     uint32_t a;
@@ -256,6 +293,7 @@ static list_t *udp_apply(closure_t *self, struct cloc loc, dict_t *context,
     st->ops.request_notify=request_notify;
     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;
 
@@ -265,13 +303,15 @@ static list_t *udp_apply(closure_t *self, struct cloc loc, dict_t *context,
     }
     d=i->data.dict;
 
+    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->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;
-       memset(&st->proxy,0,sizeof(st->proxy));
+       FILLZERO(st->proxy);
        st->proxy.sin_family=AF_INET;
        i=list_elem(l,0);
        if (!i || i->type!=t_string) {
@@ -292,7 +332,6 @@ static list_t *udp_apply(closure_t *self, struct cloc loc, dict_t *context,
     return new_closure(&st->cl);
 }
 
-init_module udp_module;
 void udp_module(dict_t *dict)
 {
     add_closure(dict,"udp",udp_apply);