static void start_connect(SESSION *session)
{
int fd;
struct linger linger;
/*
* Some systems don't set the socket error when connect() fails early
* (loopback) so we must deal with the error immediately, rather than
* retrieving it later with getsockopt(). We can't use MSG_PEEK to
* distinguish between server disconnect and connection refused.
*/
if ((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
msg_fatal("socket: %m");
(void) non_blocking(fd, NON_BLOCKING);
linger.l_onoff = 1;
linger.l_linger = 0;
if (setsockopt(fd, SOL_SOCKET, SO_LINGER, (char *) &linger,
sizeof(linger)) < 0)
msg_warn("setsockopt SO_LINGER %d: %m", linger.l_linger);
session->stream = vstream_fdopen(fd, O_RDWR);
event_enable_write(fd, connect_done, (char *) session);
smtp_timeout_setup(session->stream, var_timeout);
if (inet_windowsize > 0)
set_inet_windowsize(fd, inet_windowsize);
if (sane_connect(fd, sa, sa_length) < 0 && errno != EINPROGRESS)
fail_connect(session);
}
static SMTP_SESSION *smtp_connect_addr(SMTP_ITERATOR *iter, DSN_BUF *why,
int sess_flags)
{
const char *myname = "smtp_connect_addr";
struct sockaddr_storage ss; /* remote */
struct sockaddr *sa = (struct sockaddr *) &ss;
SOCKADDR_SIZE salen = sizeof(ss);
MAI_HOSTADDR_STR hostaddr;
DNS_RR *addr = iter->rr;
unsigned port = iter->port;
int sock;
char *bind_addr;
char *bind_var;
dsb_reset(why); /* Paranoia */
/*
* Sanity checks.
*/
if (dns_rr_to_sa(addr, port, sa, &salen) != 0) {
msg_warn("%s: skip address type %s: %m",
myname, dns_strtype(addr->type));
dsb_simple(why, "4.4.0", "network address conversion failed: %m");
return (0);
}
/*
* Initialize.
*/
if ((sock = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
msg_fatal("%s: socket: %m", myname);
if (inet_windowsize > 0)
set_inet_windowsize(sock, inet_windowsize);
/*
* Allow the sysadmin to specify the source address, for example, as "-o
* smtp_bind_address=x.x.x.x" in the master.cf file.
*/
#ifdef HAS_IPV6
if (sa->sa_family == AF_INET6) {
bind_addr = var_smtp_bind_addr6;
bind_var = VAR_LMTP_SMTP(BIND_ADDR6);
} else
#endif
if (sa->sa_family == AF_INET) {
bind_addr = var_smtp_bind_addr;
bind_var = VAR_LMTP_SMTP(BIND_ADDR);
} else
bind_var = bind_addr = "";
if (*bind_addr) {
int aierr;
struct addrinfo *res0;
if ((aierr = hostaddr_to_sockaddr(bind_addr, (char *) 0, 0, &res0)) != 0)
msg_fatal("%s: bad %s parameter: %s: %s",
myname, bind_var, bind_addr, MAI_STRERROR(aierr));
if (bind(sock, res0->ai_addr, res0->ai_addrlen) < 0)
msg_warn("%s: bind %s: %m", myname, bind_addr);
else if (msg_verbose)
msg_info("%s: bind %s", myname, bind_addr);
freeaddrinfo(res0);
}
/*
* When running as a virtual host, bind to the virtual interface so that
* the mail appears to come from the "right" machine address.
*
* XXX The IPv6 patch expands the null host (as client endpoint) and uses
* the result as the loopback address list.
*/
else {
int count = 0;
struct sockaddr *own_addr = 0;
INET_ADDR_LIST *addr_list = own_inet_addr_list();
struct sockaddr_storage *s;
for (s = addr_list->addrs; s < addr_list->addrs + addr_list->used; s++) {
if (SOCK_ADDR_FAMILY(s) == sa->sa_family) {
if (count++ > 0)
break;
own_addr = SOCK_ADDR_PTR(s);
}
}
if (count == 1 && !sock_addr_in_loopback(own_addr)) {
if (bind(sock, own_addr, SOCK_ADDR_LEN(own_addr)) < 0) {
SOCKADDR_TO_HOSTADDR(own_addr, SOCK_ADDR_LEN(own_addr),
&hostaddr, (MAI_SERVPORT_STR *) 0, 0);
msg_warn("%s: bind %s: %m", myname, hostaddr.buf);
} else if (msg_verbose) {
SOCKADDR_TO_HOSTADDR(own_addr, SOCK_ADDR_LEN(own_addr),
&hostaddr, (MAI_SERVPORT_STR *) 0, 0);
msg_info("%s: bind %s", myname, hostaddr.buf);
}
}
}
/*
* Connect to the server.
*/
if (msg_verbose)
msg_info("%s: trying: %s[%s] port %d...",
myname, STR(iter->host), STR(iter->addr), ntohs(port));
return (smtp_connect_sock(sock, sa, salen, iter, why, sess_flags));
}
