/*
* take an address and return all the mx entries for it,
* most preferred first
*/
static int
callmx(DS *ds, char *dest, char *domain)
{
int fd, i, nmx;
char addr[Maxstring];
/* get a list of mx entries */
nmx = mxlookup(ds, domain);
if(nmx < 0){
/* dns isn't working, don't just dial */
return -1;
}
if(nmx == 0){
if(debug)
fprint(2, "mxlookup returns nothing\n");
return dial(dest, 0, 0, 0);
}
/* refuse to honor loopback addresses given by dns */
for(i = 0; i < nmx; i++){
if(strcmp(mx[i].ip, "127.0.0.1") == 0){
if(debug)
fprint(2, "mxlookup returns loopback\n");
werrstr("illegal: domain lists 127.0.0.1 as mail server");
return -1;
}
}
/* sort by preference */
if(nmx > 1)
qsort(mx, nmx, sizeof(Mx), compar);
if(debug){
for(i=0; i<nmx; i++)
print("%s %d\n", mx[i].host, mx[i].pref);
}
/* dial each one in turn */
for(i = 0; i < nmx; i++){
#ifdef PLAN9PORT
snprint(addr, sizeof(addr), "%s", mx[i].host);
#else
snprint(addr, sizeof(addr), "%s!%s!%s", ds->proto,
mx[i].host, ds->service);
#endif
if(debug)
fprint(2, "mxdial trying %s (%d)\n", addr, i);
atnotify(timeout, 1);
alarm(10*1000);
#ifdef PLAN9PORT
fd = smtpdial(addr);
#else
fd = dial(addr, 0, 0, 0);
#endif
alarm(0);
atnotify(timeout, 0);
if(fd >= 0)
return fd;
}
return -1;
}
/*
* take an address and return all the mx entries for it,
* most preferred first
*/
static int
callmx(DS *ds, char *dest, char *domain)
{
int fd, i, nmx;
char *ip;
char addr[Maxstring];
/* get a list of mx entries */
nmx = mxlookup(ds, domain);
if(nmx < 0){
/* dns isn't working, don't just dial */
return -1;
}
if(nmx == 0){
if(debug)
fprint(2, "mxlookup returns nothing\n");
return dial(dest, 0, 0, 0);
}
/* refuse to honor loopback addresses given by dns. catch \n too. */
for(i = 0; i < nmx; i++) {
ip = mx[i].ip;
if(strchr(ip, '\n') != nil){
if(debug)
fprint(2, "mxlookup ip contains newline\n");
werrstr("illegal: newline in mail server ip");
return -1;
}else if(isloopback(ip)){
if(debug)
fprint(2, "mxlookup returns loopback\n");
werrstr("illegal: domain lists %s as mail server", ip);
return -1;
}
}
/* sort by preference */
if(nmx > 1)
qsort(mx, nmx, sizeof(Mx), compar);
/* dial each one in turn by name, not ip */
for(i = 0; i < nmx; i++){
if (busted(mx[i].host)) {
if (debug)
fprint(2, "mxdial skipping busted mx %s\n",
mx[i].host);
continue;
}
snprint(addr, sizeof(addr), "%s/%s!%s!%s", ds->netdir, ds->proto,
mx[i].host, ds->service);
if(debug)
fprint(2, "mxdial trying %s\n", addr);
atnotify(timeout, 1);
/* this was 10 seconds, but oclsc.org at least needs more. */
alarm(60*1000);
fd = dial(addr, 0, 0, 0);
if (debug && fd < 0)
fprint(2, "dial: %r\n");
alarm(0);
atnotify(timeout, 0);
if(fd >= 0)
return fd;
}
return -1;
}
