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wget: add EPSV support

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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 <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-02-06 15:48:12 +01:00
parent 403f2999f9
commit 1783ffa990
4 changed files with 82 additions and 61 deletions
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19
networking/wget.c
View File

@@ -791,22 +791,17 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
/*
* Entering passive mode
*/
if (ENABLE_FEATURE_IPV6 && ftpcmd("EPSV", NULL, sfp) == 229) {
/* good */
} else
if (ftpcmd("PASV", NULL, sfp) != 227) {
pasv_error:
bb_error_msg_and_die("bad response to %s: %s", "PASV", sanitize_string(G.wget_buf));
}
// 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
str = strrchr(G.wget_buf, ')');
if (str) str[0] = '\0';
str = strrchr(G.wget_buf, ',');
if (!str) goto pasv_error;
port = xatou_range(str+1, 0, 255);
*str = '\0';
str = strrchr(G.wget_buf, ',');
if (!str) goto pasv_error;
port += xatou_range(str+1, 0, 255) * 256;
port = parse_pasv_epsv(G.wget_buf);
if (port < 0)
goto pasv_error;
set_nport(&lsa->u.sa, htons(port));
*dfpp = open_socket(lsa);