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https://github.com/moparisthebest/curl
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ftp: shrink temp buffers used for PORT
These two stack based buffers only need to be 46 + 66 bytes instead of 256 + 1024. Closes #4880
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11
lib/ftp.c
11
lib/ftp.c
@ -5,7 +5,7 @@
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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@ -920,7 +920,7 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
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struct ftp_conn *ftpc = &conn->proto.ftpc;
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struct Curl_easy *data = conn->data;
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curl_socket_t portsock = CURL_SOCKET_BAD;
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char myhost[256] = "";
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char myhost[MAX_IPADR_LEN + 1] = "";
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struct Curl_sockaddr_storage ss;
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Curl_addrinfo *res, *ai;
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@ -931,7 +931,6 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
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#ifdef ENABLE_IPV6
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struct sockaddr_in6 * const sa6 = (void *)sa;
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#endif
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char tmp[1024];
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static const char mode[][5] = { "EPRT", "PORT" };
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int rc;
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int error;
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@ -1246,8 +1245,10 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
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break;
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}
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if(PORT == fcmd) {
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/* large enough for [IP address],[num],[num] */
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char target[sizeof(myhost) + 20];
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char *source = myhost;
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char *dest = tmp;
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char *dest = target;
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/* translate x.x.x.x to x,x,x,x */
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while(source && *source) {
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@ -1261,7 +1262,7 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
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*dest = 0;
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msnprintf(dest, 20, ",%d,%d", (int)(port>>8), (int)(port&0xff));
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result = Curl_pp_sendf(&ftpc->pp, "%s %s", mode[fcmd], tmp);
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result = Curl_pp_sendf(&ftpc->pp, "%s %s", mode[fcmd], target);
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if(result) {
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failf(data, "Failure sending PORT command: %s",
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curl_easy_strerror(result));
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