From 1783ffa990814e2aac14e7ff5a4bbf2d5bebe3cc Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Tue, 6 Feb 2018 15:48:12 +0100 Subject: wget: add EPSV support function old new delta parse_pasv_epsv - 151 +151 wget_main 2440 2382 -58 xconnect_ftpdata 223 94 -129 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 0/2 up/down: 151/-187) Total: -36 bytes Signed-off-by: Denys Vlasenko --- networking/parse_pasv_epsv.c | 66 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 networking/parse_pasv_epsv.c (limited to 'networking/parse_pasv_epsv.c') diff --git a/networking/parse_pasv_epsv.c b/networking/parse_pasv_epsv.c new file mode 100644 index 000000000..f32087152 --- /dev/null +++ b/networking/parse_pasv_epsv.c @@ -0,0 +1,66 @@ +/* + * Utility routines. + * + * Copyright (C) 2018 Denys Vlasenko + * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ +//kbuild:lib-$(CONFIG_FTPGET) += ftpgetput.o +//kbuild:lib-$(CONFIG_FTPPUT) += ftpgetput.o +//kbuild:lib-$(CONFIG_WGET) += parse_pasv_epsv.o + +#include "libbb.h" + +int FAST_FUNC parse_pasv_epsv(char *buf) +{ +/* + * PASV command will not work for IPv6. RFC2428 describes + * IPv6-capable "extended PASV" - EPSV. + * + * "EPSV [protocol]" asks server to bind to and listen on a data port + * in specified protocol. Protocol is 1 for IPv4, 2 for IPv6. + * If not specified, defaults to "same as used for control connection". + * If server understood you, it should answer "229 (|||port|)" + * where "|" are literal pipe chars and "port" is ASCII decimal port#. + * + * There is also an IPv6-capable replacement for PORT (EPRT), + * but we don't need that. + * + * NB: PASV may still work for some servers even over IPv6. + * For example, vsftp happily answers + * "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual. + */ + char *ptr; + int port; + + if (!ENABLE_FEATURE_IPV6 || buf[2] == '7' /* "227" */) { + /* Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage]" + * Server's IP is N1.N2.N3.N4 (we ignore it) + * Server's port for data connection is P1*256+P2 */ + ptr = strrchr(buf, ')'); + if (ptr) *ptr = '\0'; + + ptr = strrchr(buf, ','); + if (!ptr) return -1; + *ptr = '\0'; + port = xatou_range(ptr + 1, 0, 255); + + ptr = strrchr(buf, ','); + if (!ptr) return -1; + *ptr = '\0'; + port += xatou_range(ptr + 1, 0, 255) * 256; + } else { + /* Response is "229 garbage(|||P1|)" + * Server's port for data connection is P1 */ + ptr = strrchr(buf, '|'); + if (!ptr) return -1; + *ptr = '\0'; + + ptr = strrchr(buf, '|'); + if (!ptr) return -1; + *ptr = '\0'; + port = xatou_range(ptr + 1, 0, 65535); + } + + return port; +} -- cgit v1.2.3