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/*++
/* NAME
/* haproxy_srvr 3
/* SUMMARY
/* server-side haproxy protocol support
/* SYNOPSIS
/* #include <haproxy_srvr.h>
/*
/* const char *haproxy_srvr_parse(str,
/* smtp_client_addr, smtp_client_port,
/* smtp_server_addr, smtp_server_port)
/* const char *str;
/* MAI_HOSTADDR_STR *smtp_client_addr,
/* MAI_SERVPORT_STR *smtp_client_port,
/* MAI_HOSTADDR_STR *smtp_server_addr,
/* MAI_SERVPORT_STR *smtp_server_port;
/* DESCRIPTION
/* haproxy_srvr_parse() parses a haproxy line. The result is
/* null in case of success, a pointer to text (with the error
/* type) in case of error. If both IPv6 and IPv4 support are
/* enabled, IPV4_IN_IPV6 address syntax (::ffff:1.2.3.4) is
/* converted to IPV4 syntax.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif
/* Utility library. */
#include <msg.h>
#include <myaddrinfo.h>
#include <valid_hostname.h>
#include <stringops.h>
#include <mymalloc.h>
#include <inet_proto.h>
/* Global library. */
#include <haproxy_srvr.h>
/* Application-specific. */
static INET_PROTO_INFO *proto_info;
#define STR_OR_NULL(str) ((str) ? (str) : "(null)")
/* haproxy_srvr_parse_lit - extract and validate string literal */
static int haproxy_srvr_parse_lit(const char *str,...)
{
va_list ap;
const char *cp;
int result = -1;
if (msg_verbose)
msg_info("haproxy_srvr_parse: %s", STR_OR_NULL(str));
if (str != 0) {
va_start(ap, str);
while (result < 0 && (cp = va_arg(ap, const char *)) != 0)
if (strcmp(str, cp) == 0)
result = 0;
va_end(ap);
}
return (result);
}
/* haproxy_srvr_parse_proto - parse and validate the protocol type */
static int haproxy_srvr_parse_proto(const char *str, int *addr_family)
{
if (msg_verbose)
msg_info("haproxy_srvr_parse: proto=%s", STR_OR_NULL(str));
if (str == 0)
return (-1);
#ifdef AF_INET6
if (strcasecmp(str, "TCP6") == 0) {
if (strchr((char *) proto_info->sa_family_list, AF_INET6) != 0) {
*addr_family = AF_INET6;
return (0);
}
} else
#endif
if (strcasecmp(str, "TCP4") == 0) {
if (strchr((char *) proto_info->sa_family_list, AF_INET) != 0) {
*addr_family = AF_INET;
return (0);
}
}
return (-1);
}
/* haproxy_srvr_parse_addr - extract and validate IP address */
static int haproxy_srvr_parse_addr(const char *str, MAI_HOSTADDR_STR *addr,
int addr_family)
{
if (msg_verbose)
msg_info("haproxy_srvr_parse: addr=%s proto=%d",
STR_OR_NULL(str), addr_family);
if (str == 0 || strlen(str) >= sizeof(MAI_HOSTADDR_STR))
return (-1);
switch (addr_family) {
#ifdef AF_INET6
case AF_INET6:
if (!valid_ipv6_hostaddr(str, DONT_GRIPE))
return (-1);
if (strncasecmp("::ffff:", str, 7) == 0
&& strchr((char *) proto_info->sa_family_list, AF_INET) != 0) {
memcpy(addr->buf, str + 7, strlen(str) + 1 - 7);
return (0);
} else {
memcpy(addr->buf, str, strlen(str) + 1);
return (0);
}
#endif
case AF_INET:
if (!valid_ipv4_hostaddr(str, DONT_GRIPE))
return (-1);
memcpy(addr->buf, str, strlen(str) + 1);
return (0);
default:
msg_panic("haproxy_srvr_parse: unexpected address family: %d",
addr_family);
}
}
/* haproxy_srvr_parse_port - extract and validate TCP port */
static int haproxy_srvr_parse_port(const char *str, MAI_SERVPORT_STR *port)
{
if (msg_verbose)
msg_info("haproxy_srvr_parse: port=%s", STR_OR_NULL(str));
if (str == 0 || strlen(str) >= sizeof(MAI_SERVPORT_STR)
|| !valid_hostport(str, DONT_GRIPE)) {
return (-1);
} else {
memcpy(port->buf, str, strlen(str) + 1);
return (0);
}
}
/* haproxy_srvr_parse - parse haproxy line */
const char *haproxy_srvr_parse(const char *str,
MAI_HOSTADDR_STR *smtp_client_addr,
MAI_SERVPORT_STR *smtp_client_port,
MAI_HOSTADDR_STR *smtp_server_addr,
MAI_SERVPORT_STR *smtp_server_port)
{
char *saved_str = mystrdup(str);
char *cp = saved_str;
const char *err;
int addr_family;
if (proto_info == 0)
proto_info = inet_proto_info();
/*
* XXX We don't accept connections with the "UNKNOWN" protocol type,
* because those would sidestep address-based access control mechanisms.
*/
#define NEXT_TOKEN mystrtok(&cp, " \r\n")
if (haproxy_srvr_parse_lit(NEXT_TOKEN, "PROXY", (char *) 0) < 0)
err = "unexpected protocol header";
else if (haproxy_srvr_parse_proto(NEXT_TOKEN, &addr_family) < 0)
err = "unsupported protocol type";
else if (haproxy_srvr_parse_addr(NEXT_TOKEN, smtp_client_addr,
addr_family) < 0)
err = "unexpected client address syntax";
else if (haproxy_srvr_parse_addr(NEXT_TOKEN, smtp_server_addr,
addr_family) < 0)
err = "unexpected server address syntax";
else if (haproxy_srvr_parse_port(NEXT_TOKEN, smtp_client_port) < 0)
err = "unexpected client port syntax";
else if (haproxy_srvr_parse_port(NEXT_TOKEN, smtp_server_port) < 0)
err = "unexpected server port syntax";
else
err = 0;
myfree(saved_str);
return (err);
}
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