udp: Break out udp_make_socket

Make this into a function by itself and adjust its arguments so that
when we support multiple sockets (for multiple addresses so that we
can have multiple AFs) we can just call it for each one.

No functional change.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/udp.c b/udp.c
index 477dea3..33a8707 100644 (file)
--- a/udp.c
+++ b/udp.c
@@ -200,22 +200,19 @@ static bool_t udp_sendmsg(void *commst, struct buffer_if *buf,
     return True;
 }
 
-static void udp_phase_hook(void *sst, uint32_t new_phase)
+static void udp_make_socket(struct udp *st, struct udp *us)
 {
-    struct udp *st=sst;
-    union iaddr addr;
-
-    st->fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
-    if (st->fd<0) {
+    const union iaddr *addr=&us->addr;
+    us->fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+    if (us->fd<0) {
        fatal_perror("udp (%s:%d): socket",st->loc.file,st->loc.line);
     }
-    if (fcntl(st->fd, F_SETFL, fcntl(st->fd, F_GETFL)|O_NONBLOCK)==-1) {
+    if (fcntl(us->fd, F_SETFL, fcntl(us->fd, F_GETFL)|O_NONBLOCK)==-1) {
        fatal_perror("udp (%s:%d): fcntl(set O_NONBLOCK)",
                     st->loc.file,st->loc.line);
     }
-    setcloexec(st->fd);
+    setcloexec(us->fd);
 
-    addr=st->addr;
     if (st->authbind) {
        pid_t c;
        int status;
@@ -228,10 +225,10 @@ static void udp_phase_hook(void *sst, uint32_t new_phase)
        }
        if (c==0) {
            char *argv[4], addrstr[9], portstr[5];
-           switch (addr.sa.sa_family) {
+           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);
+               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",
@@ -241,7 +238,7 @@ static void udp_phase_hook(void *sst, uint32_t new_phase)
            argv[1]=addrstr;
            argv[2]=portstr;
            argv[3]=NULL;
-           dup2(st->fd,0);
+           dup2(us->fd,0);
            execvp(st->authbind,argv);
            _exit(255);
        }
@@ -258,11 +255,16 @@ static void udp_phase_hook(void *sst, uint32_t new_phase)
                  st->loc.line, WEXITSTATUS(status));
        }
     } else {
-       if (bind(st->fd, &addr.sa, iaddr_socklen(&addr))!=0) {
+       if (bind(st->fd, &addr->sa, iaddr_socklen(addr))!=0) {
            fatal_perror("udp (%s:%d): bind",st->loc.file,st->loc.line);
        }
     }
+}
 
+static void udp_phase_hook(void *sst, uint32_t new_phase)
+{
+    struct udp *st=sst;
+    udp_make_socket(st,st);
     register_for_poll(st,udp_beforepoll,udp_afterpoll,1,"udp");
 }