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FTP: fix IPv6 host using link-local address 

... and make sure we can connect the data connection to a host name that
is longer than 48 bytes.

Also simplifies the code somewhat by re-using the original host name
more, as it is likely still in the DNS cache.

Original-Patch-by: Vojtěch Král
Bug: http://curl.haxx.se/bug/view.cgi?id=1468
This commit is contained in:
Daniel Stenberg 2015-01-08 18:30:01 +01:00
parent 659d252b6f
commit 9a452ba3a1
2 changed files with 28 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
lib/ftp.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -294,10 +294,10 @@ static void freedirs(struct ftp_conn *ftpc)
ftpc->dirs = NULL;
ftpc->dirdepth = 0;
}
if(ftpc->file) {
free(ftpc->file);
ftpc->file = NULL;
}
Curl_safefree(ftpc->file);
/* no longer of any use */
Curl_safefree(ftpc->newhost);
}
/* Returns non-zero if the given string contains CR (\r) or LF (\n),
@ -1917,6 +1917,9 @@ static CURLcode ftp_state_pasv_resp(struct connectdata *conn,
unsigned short connectport; /* the local port connect() should use! */
char *str=&data->state.buffer[4]; /* start on the first letter */
/* if we come here again, make sure the former name is cleared */
Curl_safefree(ftpc->newhost);
if((ftpc->count1 == 0) &&
(ftpcode == 229)) {
/* positive EPSV response */
@ -1949,18 +1952,10 @@ static CURLcode ftp_state_pasv_resp(struct connectdata *conn,
if(ptr) {
ftpc->newport = (unsigned short)(num & 0xffff);
if(conn->bits.tunnel_proxy ||
conn->proxytype == CURLPROXY_SOCKS5 ||
conn->proxytype == CURLPROXY_SOCKS5_HOSTNAME ||
conn->proxytype == CURLPROXY_SOCKS4 ||
conn->proxytype == CURLPROXY_SOCKS4A)
/* proxy tunnel -> use other host info because ip_addr_str is the
proxy address not the ftp host */
snprintf(ftpc->newhost, sizeof(ftpc->newhost), "%s",
conn->host.name);
else
/* use the same IP we are already connected to */
snprintf(ftpc->newhost, NEWHOST_BUFSIZE, "%s", conn->ip_addr_str);
/* use the original host name again */
ftpc->newhost = strdup(conn->host.name);
if(!ftpc->newhost)
return CURLE_OUT_OF_MEMORY;
}
}
else
@ -2001,26 +1996,21 @@ static CURLcode ftp_state_pasv_resp(struct connectdata *conn,
/* we got OK from server */
if(data->set.ftp_skip_ip) {
/* told to ignore the remotely given IP but instead use the one we used
/* told to ignore the remotely given IP but instead use the host we used
for the control connection */
infof(data, "Skips %d.%d.%d.%d for data connection, uses %s instead\n",
infof(data, "Skip %d.%d.%d.%d for data connection, re-use %s instead\n",
ip[0], ip[1], ip[2], ip[3],
conn->ip_addr_str);
if(conn->bits.tunnel_proxy ||
conn->proxytype == CURLPROXY_SOCKS5 ||
conn->proxytype == CURLPROXY_SOCKS5_HOSTNAME ||
conn->proxytype == CURLPROXY_SOCKS4 ||
conn->proxytype == CURLPROXY_SOCKS4A)
/* proxy tunnel -> use other host info because ip_addr_str is the
proxy address not the ftp host */
snprintf(ftpc->newhost, sizeof(ftpc->newhost), "%s", conn->host.name);
else
snprintf(ftpc->newhost, sizeof(ftpc->newhost), "%s",
conn->ip_addr_str);
conn->host.name);
/* use the original host name again */
ftpc->newhost = strdup(conn->host.name);
}
else
snprintf(ftpc->newhost, sizeof(ftpc->newhost),
"%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
ftpc->newhost = aprintf("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
if(!ftpc->newhost)
return CURLE_OUT_OF_MEMORY;
ftpc->newport = (unsigned short)(((port[0]<<8) + port[1]) & 0xffff);
}
else if(ftpc->count1 == 0) {

11
lib/ftp.h
View File

@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -147,11 +147,10 @@ struct ftp_conn {
curl_off_t known_filesize; /* file size is different from -1, if wildcard
LIST parsing was done and wc_statemach set
it */
/* newhost must be able to hold a full IP-style address in ASCII, which
in the IPv6 case means 5*8-1 = 39 letters */
#define NEWHOST_BUFSIZE 48
char newhost[NEWHOST_BUFSIZE]; /* this is the pair to connect the DATA... */
unsigned short newport; /* connection to */
/* newhost is the (allocated) IP addr or host name to connect the data
connection to */
char *newhost; /* this is the pair to connect the DATA... */
unsigned short newport; /* connection to */
};