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Commit c3aa1bd3 authored by Julian Anastasov's avatar Julian Anastasov Committed by Simon Horman
Browse files

ipvs: support more FTP PASV responses 



	Change the parsing of FTP commands and responses to
support skip character. It allows to detect variations in
the 227 PASV response.

Signed-off-by: default avatarJulian Anastasov <ja@ssi.bg>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
parent 8f0ea0fe

net/netfilter/ipvs/ip_vs_ftp.c

+38 −14
Original line number Diff line number Diff line
@@ -44,7 +44,7 @@ 
#include <net/ip_vs.h>





#define SERVER_STRING "227 Entering Passive Mode ("

#define SERVER_STRING "227 "

#define CLIENT_STRING "PORT"
@@ -79,14 +79,17 @@ ip_vs_ftp_done_conn(struct ip_vs_app *app, struct ip_vs_conn *cp) 


/*

 * Get <addr,port> from the string "xxx.xxx.xxx.xxx,ppp,ppp", started

 * with the "pattern" and terminated with the "term" character.

 * with the "pattern", ignoring before "skip" and terminated with

 * the "term" character.

 * <addr,port> is in network order.

 */

static int ip_vs_ftp_get_addrport(char *data, char *data_limit,

				  const char *pattern, size_t plen, char term,

				  const char *pattern, size_t plen,

				  char skip, char term,

				  __be32 *addr, __be16 *port,

				  char **start, char **end)

{

	char *s, c;

	unsigned char p[6];

	int i = 0;
@@ -101,19 +104,38 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit, 
	if (strnicmp(data, pattern, plen) != 0) {

		return 0;

	}

	*start = data + plen;

	s = data + plen;

	if (skip) {

		int found = 0;



	for (data = *start; *data != term; data++) {

		for (;; s++) {

			if (s == data_limit)

				return -1;

			if (!found) {

				if (*s == skip)

					found = 1;

			} else if (*s != skip) {

				break;

			}

		}

	}



	for (data = s; ; data++) {

		if (data == data_limit)

			return -1;

		if (*data == term)

			break;

	}

	*end = data;



	memset(p, 0, sizeof(p));

	for (data = *start; data != *end; data++) {

		if (*data >= '0' && *data <= '9') {

			p[i] = p[i]*10 + *data - '0';

		} else if (*data == ',' && i < 5) {

	for (data = s; ; data++) {

		c = *data;

		if (c == term)

			break;

		if (c >= '0' && c <= '9') {

			p[i] = p[i]*10 + c - '0';

		} else if (c == ',' && i < 5) {

			i++;

		} else {

			/* unexpected character */
@@ -124,6 +146,7 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit, 
	if (i != 5)

		return -1;



	*start = s;

	*addr = get_unaligned((__be32 *) p);

	*port = get_unaligned((__be16 *) (p + 4));

	return 1;
@@ -185,7 +208,8 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp, 


		if (ip_vs_ftp_get_addrport(data, data_limit,

					   SERVER_STRING,

					   sizeof(SERVER_STRING)-1, ')',

					   sizeof(SERVER_STRING)-1,

					   '(', ')',

					   &from.ip, &port,

					   &start, &end) != 1)

			return 1;
@@ -345,7 +369,7 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp, 
	 */

	if (ip_vs_ftp_get_addrport(data_start, data_limit,

				   CLIENT_STRING, sizeof(CLIENT_STRING)-1,

				   '\r', &to.ip, &port,

				   ' ', '\r', &to.ip, &port,

				   &start, &end) != 1)

		return 1;