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/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
/* Copyright (c) The Exim Maintainers 2020 - 2022 */
/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
#include "exim.h"
/*************************************************
* Extract port from address string *
*************************************************/
/* In the spool file, and in the -oMa and -oMi options, a host plus port is
given as an IP address followed by a dot and a port number. This function
decodes this.
An alternative format for the -oMa and -oMi options is [ip address]:port which
is what Exim 4 uses for output, because it seems to becoming commonly used,
whereas the dot form confuses some programs/people. So we recognize that form
too.
Argument:
address points to the string; if there is a port, the '.' in the string
is overwritten with zero to terminate the address; if the string
is in the [xxx]:ppp format, the address is shifted left and the
brackets are removed
Returns: 0 if there is no port, else the port number. If there's a syntax
error, leave the incoming address alone, and return 0.
*/
int
host_address_extract_port(uschar * address)
{
int port = 0;
uschar *endptr;
/* Handle the "bracketed with colon on the end" format */
if (*address == '[')
{
uschar *rb = address + 1;
while (*rb != 0 && *rb != ']') rb++;
if (*rb++ == 0) return 0; /* Missing ]; leave invalid address */
if (*rb == ':')
{
port = Ustrtol(rb + 1, &endptr, 10);
if (*endptr != 0) return 0; /* Invalid port; leave invalid address */
}
else if (*rb != 0) return 0; /* Bad syntax; leave invalid address */
memmove(address, address + 1, rb - address - 2);
rb[-2] = 0;
}
/* Handle the "dot on the end" format */
else
{
int skip = -3; /* Skip 3 dots in IPv4 addresses */
address--;
while (*(++address) != 0)
{
int ch = *address;
if (ch == ':') skip = 0; /* Skip 0 dots in IPv6 addresses */
else if (ch == '.' && skip++ >= 0) break;
}
if (*address == 0) return 0;
port = Ustrtol(address + 1, &endptr, 10);
if (*endptr != 0) return 0; /* Invalid port; leave invalid address */
*address = 0;
}
return port;
}
/* vi: aw ai sw=2
*/
/* End of host.c */
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