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author | Julian Anastasov <ja@ssi.bg> | 2011-05-30 00:02:23 +0300 |
---|---|---|
committer | Simon Horman <horms@verge.net.au> | 2011-06-13 10:03:01 +0900 |
commit | c3aa1bd3768e278512f7583ce5f5fe84f466345d (patch) | |
tree | 149ea0fe7de3bf958df245cac46b7538b5cf5cb0 /net/netfilter/ipvs | |
parent | 8f0ea0fe3a036a47767f9c80e81b13e379a1f43b (diff) | |
download | op-kernel-dev-c3aa1bd3768e278512f7583ce5f5fe84f466345d.zip op-kernel-dev-c3aa1bd3768e278512f7583ce5f5fe84f466345d.tar.gz |
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: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net/netfilter/ipvs')
-rw-r--r-- | net/netfilter/ipvs/ip_vs_ftp.c | 52 |
1 files changed, 38 insertions, 14 deletions
diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c index af63553..4490a32 100644 --- a/net/netfilter/ipvs/ip_vs_ftp.c +++ b/net/netfilter/ipvs/ip_vs_ftp.c @@ -44,8 +44,8 @@ #include <net/ip_vs.h> -#define SERVER_STRING "227 Entering Passive Mode (" -#define CLIENT_STRING "PORT " +#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 (;; s++) { + if (s == data_limit) + return -1; + if (!found) { + if (*s == skip) + found = 1; + } else if (*s != skip) { + break; + } + } + } - for (data = *start; *data != term; data++) { + 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 */ @@ -124,8 +146,9 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit, if (i != 5) return -1; - *addr = get_unaligned((__be32 *)p); - *port = get_unaligned((__be16 *)(p + 4)); + *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; |