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code/docs: Use correct case for IPv4 and IPv6

For consistency, as we seem to have a bit of a mixed bag, changed all
instances of ipv4 and ipv6 in comments and documentations to use the
correct case.
This commit is contained in:
Steve Holme 2014-12-27 11:09:01 +00:00
parent bde08d216c
commit 151ae59436
21 changed files with 74 additions and 74 deletions

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@ -267,7 +267,7 @@ Daniel Stenberg (16 Apr 2010)
Daniel Stenberg (15 Apr 2010)
- Rainer Canavan filed bug report #2987196 that identified libcurl doing
unnecesary reverse name lookups in many cases when built to use IPv4 and
getaddrinfo(). The logic for ipv6 is now used for ipv4 too.
getaddrinfo(). The logic for IPv6 is now used for IPv4 too.
(http://curl.haxx.se/bug/view.cgi?id=2963679)
@ -4271,7 +4271,7 @@ Daniel S (15 Nov 2007)
list.
- Michal Marek fixed the test suite to better deal with the case when the HTTP
ipv6 server can't run.
IPv6 server can't run.
Yang Tse (14 Nov 2007)
- Fix a variable potential wrapping in add_buffer() when using absolutely
@ -6109,7 +6109,7 @@ Daniel (22 August 2006)
- David McCreedy fixed a remaining mistake from the August 19 TYPE change.
- Peter Sylvester pointed out a flaw in the AllowServerConnect() in the FTP
code when doing pure ipv6 EPRT connections.
code when doing pure IPv6 EPRT connections.
Daniel (19 August 2006)
- Based on a patch by Armel Asselin, the FTP code no longer re-issues the TYPE
@ -6666,8 +6666,8 @@ Daniel (24 January 2006)
Daniel (20 January 2006)
- Duane Cathey was one of our friends who reported that curl -P [IP]
(CURLOPT_FTPPORT) didn't work for ipv6-enabed curls if the IP wasn't a
"native" IP while it works fine for ipv6-disabled builds!
(CURLOPT_FTPPORT) didn't work for IPv6-enabed curls if the IP wasn't a
"native" IP while it works fine for IPv6-disabled builds!
In the process of fixing this, I removed the support for LPRT since I can't
think of many reasons to keep doing it and asking on the mailing list didn't
@ -6676,7 +6676,7 @@ Daniel (20 January 2006)
Daniel (19 January 2006)
- Jon Turner pointed out that doing -P [hostname] (CURLOPT_FTPPORT) with curl
(built ipv4-only) didn't work.
(built IPv4-only) didn't work.
Daniel (18 January 2006)
- As reported in bug #1408742 (http://curl.haxx.se/bug/view.cgi?id=1408742),
@ -7557,7 +7557,7 @@ Daniel (29 March 2005)
Daniel (16 March 2005)
- Tru64 and some IRIX boxes seem to not like test 237 as it is. Their
inet_addr() functions seems to use &255 on all numericals in a ipv4 dotted
address which makes a different failure... Now I've modified the ipv4
address which makes a different failure... Now I've modified the IPv4
resolve code to use inet_pton() instead in an attempt to make these systems
better detect this as a bad IP address rather than creating a toally bogus
address that is then passed on and used.
@ -7750,7 +7750,7 @@ Daniel (7 February 2005)
Daniel (5 February 2005)
- Eric Vergnaud found a use of an uninitialised variable in the ftp when doing
PORT on ipv6-enabled hosts.
PORT on IPv6-enabled hosts.
- David Byron pointed out we could use BUFSIZE to read data (in
lib/transfer.c) instead of using BUFSIZE -1.
@ -7822,7 +7822,7 @@ Daniel (28 January 2005)
8. fetch a URL from the same server as before (re-using the connection)
- Stephen More pointed out that CURLOPT_FTPPORT and the -P option didn't work
when built ipv6-enabled. I've now made a fix for it. Writing test cases for
when built IPv6-enabled. I've now made a fix for it. Writing test cases for
custom port hosts turned too tricky so unfortunately there's none.
Daniel (25 January 2005)
@ -8560,9 +8560,9 @@ Daniel (20 August 2004)
byte file is downloaded.
Daniel (18 August 2004)
- Ling Thio pointed out that when libcurl is built ipv6-enabled, it still did
- Ling Thio pointed out that when libcurl is built IPv6-enabled, it still did
reverse DNS lookups when fed with a numerical IP-address (like
http://127.0.0.1/), although it doesn't when built ipv6-disabled. libcurl
http://127.0.0.1/), although it doesn't when built IPv6-disabled. libcurl
should never do reverse lookups.
Daniel (17 August 2004)
@ -8714,7 +8714,7 @@ Daniel (27 June 2004)
Daniel (24 June 2004)
- The standard curl_version() string now only includes version info about
involved libraries and not about particular features. Thus it will no longer
include info about ipv6 nor GSS. That info is of course still available in
include info about IPv6 nor GSS. That info is of course still available in
the feature bitmask curl_version_info() offers.
- Replaced all occurances of sprintf() with snprintf(). This is mostly because
@ -8729,8 +8729,8 @@ Daniel (24 June 2004)
Internally, this means amongst other things that we can stop doing the weird
"increase buffer size until it works" trick when resolving hosts on
ipv4-only with gethostbyname_r(), we support socks even on libcurls built
with ipv6 enabled (but only to socks servers that resolve to an ipv4
IPv4-only with gethostbyname_r(), we support socks even on libcurls built
with IPv6 enabled (but only to socks servers that resolve to an IPv4
address) and we no longer deep-copy or relocate hostent structs (we create
Curl_addrinfo chains instead).
@ -9074,7 +9074,7 @@ Daniel (27 April 2004)
and proxy name to the ACE encoded version to use internally for resolves and
cookies etc. They are now using one 'struct hostname' each that keep both
the original name and the possibly encoded name. IDN resolves work for me
now using ipv6, ipv4 and ares resolving. Even cookies on IDN sites seem to
now using IPv6, IPv4 and ares resolving. Even cookies on IDN sites seem to
do right. I got some failures at first when CHARSET wasn't set at all which
confused libidn completely and it decided by encoding of choice was
'ANSI_X3.4-1968'...
@ -9115,7 +9115,7 @@ Daniel (25 April 2004)
CURLRES_ARES - is defined if libcurl is built to use c-ares for asynchronous
name resolves. It cannot have ENABLE_IPV6 defined at the same time, as
c-ares has no ipv6 support. This can be Windows or *nix.
c-ares has no IPv6 support. This can be Windows or *nix.
CURLRES_THREADED - is defined if libcurl is built to run under (native)
Windows, and then the name resolve will be done in a new thread, and the
@ -9132,8 +9132,8 @@ Daniel (25 April 2004)
hostsyn.c - functions for synchronous name resolves
hostares.c - functions for ares-using name resolves
hostthre.c - functions for threaded name resolves
hostip4.c - ipv4-specific functions
hostip6.c - ipv6-specific functions
hostip4.c - IPv4 specific functions
hostip6.c - IPv6 specific functions
The hostip.h is the single united header file for all this. It defines the
CURLRES_* defines based on the config*.h and setup.h defines.
@ -9225,7 +9225,7 @@ Daniel (15 April 2004)
for the typical (not very deep) case.
Daniel (14 April 2004)
- Asking for CURL_IPRESOLVE_V6 when ipv6 addresses can't be resolved will
- Asking for CURL_IPRESOLVE_V6 when IPv6 addresses can't be resolved will
now cause the resolve function to return NULL immediately. This flaw was
pointed out by Gisle Vanem.
@ -9380,7 +9380,7 @@ Daniel (29 March 2004)
- The postit2.c source example used the wrong struct name for the post data.
Daniel (26 March 2004)
- Gisle Vanem improved ipv6 support on windows by making the curl build to use
- Gisle Vanem improved IPv6 support on Windows by making the curl build use
the correct getaddrinfo() function.
Daniel (25 March 2004)
@ -9673,7 +9673,7 @@ Daniel (16 February 2004)
and re-use that same handle during the entire curl handle's life-time. It
improves performance.
- Fixed a problem when displaying verbose for ipv6-enabled libcurls and
- Fixed a problem when displaying verbose for IPv6-enabled libcurls and
re-used connections. Problem reported and fix verified by Grigory Entin.
- Jeff Lawson fixed the version-check in the SOCKS5 code.
@ -9725,7 +9725,7 @@ Daniel (9 February 2004)
- Tor Arntsen provided a patch that makes libcurl work-around a bug in the
AIX5 implementation of getaddrinfo(). This makes the FTP PORT stuff work on
ipv6-enabled AIX builds.
IPv6-enabled AIX builds.
- Ken Rastatter provided portability fixes for the curlgtk.c example, and now
it runs on windows with GTK as well!
@ -9754,7 +9754,7 @@ Daniel (5 February 2004)
verifies this functionality.
- Tor Arntsen fixed a weird getaddrinfo() usage in the FTP code, preventing
the ipv6-code for PORT work on AIX 5.2. We now also provide (better) error
the IPv6-code for PORT work on AIX 5.2. We now also provide (better) error
messages when bailing out in the that function.
- Tor Arntsen now provides AIX and IRIX (using gcc, xlc and the MIPSPro
@ -10133,10 +10133,10 @@ Daniel (13 November)
possibly other platforms too.
- Peter Sylvester identified a problem in the connect code, which made the
multi interface on a ipv6-enabled solaris box do bad. Test case 504 to be
multi interface on a IPv6-enabled Solaris box do bad. Test case 504 to be
specific. I've spent some time to clean-up the Curl_connecthost() function
now to use less duplicated code for the two different sections: ipv6 and
ipv4.
now to use less duplicated code for the two different sections: IPv6 and
IPv4.
Daniel (11 November)
- Added CURLOPT_NETRC_FILE. Use this to tell libcurl which file to use instead
@ -10234,7 +10234,7 @@ Daniel (29 October)
Daniel (28 October)
- Dan C tracked down yet another weird behavior in the glibc gethostbyname_r()
function for some specific versions (reported on 2.2.5 and 2.1.1), and
provided a fix. On Linux machines with these glibc versions, non-ipv6
provided a fix. On Linux machines with these glibc versions, non-IPv6
builds of libcurl would often fail to resolve perfectly resolvable host
names.
@ -10353,7 +10353,7 @@ Version 7.10.8-pre3 (8 October 2003)
Daniel (8 October)
- Frank Ticheler provided a patch that fixes how libcurl connects to multiple
addresses, if one of them fails (ipv4-code).
addresses, if one of them fails (IPv4 code).
Daniel (7 October)
- Neil Dunbar provided a patch that now makes libcurl check SSL
@ -11865,7 +11865,7 @@ Daniel (30 Sep 2002)
updated the man page accordingly.
- Cris Bailiff found out that the pre-releases crashed on name lookups on
names such as "a:" or "baz:" (on Linux versions not being ipv6-enabled) due
names such as "a:" or "baz:" (on Linux versions not being IPv6-enabled) due
to some weird return codes from gethostbyname_r(). I'll blame the complete
lack of docs in that department. Cris provided a fix, which I modified only
slightly.

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@ -1064,10 +1064,10 @@ dnl **********************************************************************
dnl Checks for IPv6
dnl **********************************************************************
AC_MSG_CHECKING([whether to enable ipv6])
AC_MSG_CHECKING([whether to enable IPv6])
AC_ARG_ENABLE(ipv6,
AC_HELP_STRING([--enable-ipv6],[Enable ipv6 (with ipv4) support])
AC_HELP_STRING([--disable-ipv6],[Disable ipv6 support]),
AC_HELP_STRING([--enable-ipv6],[Enable IPv6 (with IPv4) support])
AC_HELP_STRING([--disable-ipv6],[Disable IPv6 support]),
[ case "$enableval" in
no)
AC_MSG_RESULT(no)
@ -3600,7 +3600,7 @@ AC_MSG_NOTICE([Configured to build curl/libcurl:
GSS-API support: ${curl_gss_msg}
TLS-SRP support: ${curl_tls_srp_msg}
resolver: ${curl_res_msg}
ipv6 support: ${curl_ipv6_msg}
IPv6 support: ${curl_ipv6_msg}
Unix sockets support: ${curl_unix_sockets_msg}
IDN support: ${curl_idn_msg}
Build libcurl: Shared=${enable_shared}, Static=${enable_static}

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@ -1274,7 +1274,7 @@ FAQ
you want to change name resolver function you must rebuild libcurl and tell
it to use a different function.
- The non-ipv6 resolver that can use one out of four host name resolve calls
- The non-IPv6 resolver that can use one out of four host name resolve calls
(depending on what your system supports):
A - gethostbyname()
@ -1282,15 +1282,15 @@ FAQ
C - gethostbyname_r() with 5 arguments
D - gethostbyname_r() with 6 arguments
- The ipv6-resolver that uses getaddrinfo()
- The IPv6-resolver that uses getaddrinfo()
- The c-ares based name resolver that uses the c-ares library for resolves.
Using this offers asynchronous name resolves.
- The threaded resolver (default option on Windows). It uses:
A - gethostbyname() on plain ipv4 hosts
B - getaddrinfo() on ipv6-enabled hosts
A - gethostbyname() on plain IPv4 hosts
B - getaddrinfo() on IPv6 enabled hosts
Also note that libcurl never resolves or reverse-lookups addresses given as
pure numbers, such as 127.0.0.1 or ::1.

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@ -135,7 +135,7 @@
Use 'struct lifreq' and SIOCGLIFADDR instead of 'struct ifreq' and
SIOCGIFADDR on newer Solaris versions as they claim the latter is obsolete.
To support ipv6 interface addresses for network interfaces properly.
To support IPv6 interface addresses for network interfaces properly.
1.4 signal-based resolver timeouts

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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 2012 - 2014, 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
@ -336,7 +336,7 @@ static curl_socket_t opensocket(void *clientp,
curl_socket_t sockfd = CURL_SOCKET_BAD;
/* restrict to ipv4 */
/* restrict to IPv4 */
if (purpose == CURLSOCKTYPE_IPCXN && address->family == AF_INET)
{
/* create a tcp socket object */

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@ -1658,8 +1658,8 @@ typedef enum {
option might be handy to force libcurl to use a specific IP version. */
#define CURL_IPRESOLVE_WHATEVER 0 /* default, resolves addresses to all IP
versions that your system allows */
#define CURL_IPRESOLVE_V4 1 /* resolve to ipv4 addresses */
#define CURL_IPRESOLVE_V6 2 /* resolve to ipv6 addresses */
#define CURL_IPRESOLVE_V4 1 /* resolve to IPv4 addresses */
#define CURL_IPRESOLVE_V6 2 /* resolve to IPv6 addresses */
/* three convenient "aliases" that follow the name scheme better */
#define CURLOPT_RTSPHEADER CURLOPT_HTTPHEADER

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@ -711,9 +711,9 @@ else
@echo c-ares support: no
endif
ifdef ENABLE_IPV6
@echo ipv6 support: enabled
@echo IPv6 support: enabled
else
@echo ipv6 support: no
@echo IPv6 support: no
endif
$(CURL_INC)/curl/curlbuild.h: Makefile.netware FORCE

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@ -28,8 +28,8 @@
hostsyn.c - functions for synchronous name resolves
asyn-ares.c - functions for asynchronous name resolves using c-ares
asyn-thread.c - functions for asynchronous name resolves using threads
hostip4.c - ipv4-specific functions
hostip6.c - ipv6-specific functions
hostip4.c - IPv4 specific functions
hostip6.c - IPv6 specific functions
The hostip.h is the single united header file for all this. It defines the
CURLRES_* defines based on the config*.h and curl_setup.h defines.

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@ -635,7 +635,7 @@ Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
}
if((pf != PF_INET) && !Curl_ipv6works())
/* the stack seems to be a non-ipv6 one */
/* The stack seems to be a non-IPv6 one */
pf = PF_INET;
#endif /* CURLRES_IPV6 */

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@ -376,7 +376,7 @@ static CURLcode bindlocal(struct connectdata *conn,
if(done > 0) {
#ifdef ENABLE_IPV6
/* ipv6 address */
/* IPv6 address */
if(af == AF_INET6) {
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
char *scope_ptr = strchr(myhost, '%');
@ -399,7 +399,7 @@ static CURLcode bindlocal(struct connectdata *conn,
}
else
#endif
/* ipv4 address */
/* IPv4 address */
if((af == AF_INET) &&
(Curl_inet_pton(AF_INET, myhost, &si4->sin_addr) > 0)) {
si4->sin_family = AF_INET;

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@ -41,7 +41,7 @@ long Curl_timeleft(struct SessionHandle *data,
#define DEFAULT_CONNECT_TIMEOUT 300000 /* milliseconds == five minutes */
#define HAPPY_EYEBALLS_TIMEOUT 200 /* milliseconds to wait between
ipv4/ipv6 connection attempts */
IPv4/IPv6 connection attempts */
/*
* Used to extract socket and connectdata struct for the most recent

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@ -1254,10 +1254,10 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
continue;
if((PORT == fcmd) && sa->sa_family != AF_INET)
/* PORT is ipv4 only */
/* PORT is IPv4 only */
continue;
switch (sa->sa_family) {
switch(sa->sa_family) {
case AF_INET:
port = ntohs(sa4->sin_port);
break;

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@ -110,7 +110,7 @@ CURLcode Curl_addrinfo_callback(struct connectdata *conn,
async struct */
conn->async.done = TRUE;
/* ipv4: The input hostent struct will be freed by ares when we return from
/* IPv4: The input hostent struct will be freed by ares when we return from
this function */
return result;
}

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@ -98,8 +98,8 @@
* hostip.c - method-independent resolver functions and utility functions
* hostasyn.c - functions for asynchronous name resolves
* hostsyn.c - functions for synchronous name resolves
* hostip4.c - ipv4-specific functions
* hostip6.c - ipv6-specific functions
* hostip4.c - IPv4 specific functions
* hostip6.c - IPv6 specific functions
*
* The two asynchronous name resolver backends are implemented in:
* asyn-ares.c - functions for ares-using name resolves

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@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2014, 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
@ -92,7 +92,7 @@ int Curl_resolv_timeout(struct connectdata *conn, const char *hostname,
#ifdef CURLRES_IPV6
/*
* Curl_ipv6works() returns TRUE if ipv6 seems to work.
* Curl_ipv6works() returns TRUE if IPv6 seems to work.
*/
bool Curl_ipv6works(void);
#else

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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2014, 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
@ -57,9 +57,9 @@
#include "memdebug.h"
/***********************************************************************
* Only for plain-ipv4 builds
* Only for plain IPv4 builds
**********************************************************************/
#ifdef CURLRES_IPV4 /* plain ipv4 code coming up */
#ifdef CURLRES_IPV4 /* plain IPv4 code coming up */
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.
@ -67,7 +67,7 @@
bool Curl_ipvalid(struct connectdata *conn)
{
if(conn->ip_version == CURL_IPRESOLVE_V6)
/* an ipv6 address was requested and we can't get/use one */
/* An IPv6 address was requested and we can't get/use one */
return FALSE;
return TRUE; /* OK, proceed */
@ -76,7 +76,7 @@ bool Curl_ipvalid(struct connectdata *conn)
#ifdef CURLRES_SYNCH
/*
* Curl_getaddrinfo() - the ipv4 synchronous version.
* Curl_getaddrinfo() - the IPv4 synchronous version.
*
* The original code to this function was from the Dancer source code, written
* by Bjorn Reese, it has since been patched and modified considerably.

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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2014, 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
@ -58,7 +58,7 @@
#include "memdebug.h"
/***********************************************************************
* Only for ipv6-enabled builds
* Only for IPv6-enabled builds
**********************************************************************/
#ifdef CURLRES_IPV6
@ -97,7 +97,7 @@ int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
#endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
/*
* Curl_ipv6works() returns TRUE if ipv6 seems to work.
* Curl_ipv6works() returns TRUE if IPv6 seems to work.
*/
bool Curl_ipv6works(void)
{
@ -109,7 +109,7 @@ bool Curl_ipv6works(void)
/* probe to see if we have a working IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD)
/* an ipv6 address was requested but we can't get/use one */
/* an IPv6 address was requested but we can't get/use one */
ipv6_works = 0;
else {
ipv6_works = 1;
@ -152,7 +152,7 @@ static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
#endif
/*
* Curl_getaddrinfo() when built ipv6-enabled (non-threading and
* Curl_getaddrinfo() when built IPv6-enabled (non-threading and
* non-ares version).
*
* Returns name information about the given hostname and port number. If
@ -192,7 +192,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
}
if((pf != PF_INET) && !Curl_ipv6works())
/* the stack seems to be a non-ipv6 one */
/* The stack seems to be a non-IPv6 one */
pf = PF_INET;
memset(&hints, 0, sizeof(hints));

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@ -289,7 +289,7 @@ data that is defined within the <reply><data></data></reply> section.
If there's no test number found above, the HTTP test server will use the
number following the last dot in the given hostname (made so that a CONNECT
can still pass on test number) so that "foo.bar.123" gets treated as test case
123. Alternatively, if an ipv6-address is provided to CONNECT, the last
123. Alternatively, if an IPv6 address is provided to CONNECT, the last
hexadecimal group in the address will be used as the test numer! For example
the address "[1234::ff]" would be treated as test case 255.

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@ -2529,12 +2529,12 @@ sub checksystem {
}
if($has_ipv6) {
# client has ipv6 support
# client has IPv6 support
# check if the HTTP server has it!
my @sws = `server/sws --version`;
if($sws[0] =~ /IPv6/) {
# HTTP server has ipv6 support!
# HTTP server has IPv6 support!
$http_ipv6 = 1;
$gopher_ipv6 = 1;
}
@ -2542,7 +2542,7 @@ sub checksystem {
# check if the FTP server has it!
@sws = `server/sockfilt --version`;
if($sws[0] =~ /IPv6/) {
# FTP server has ipv6 support!
# FTP server has IPv6 support!
$ftp_ipv6 = 1;
}
}

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@ -120,7 +120,7 @@ int main(int argc, char *argv[])
/* Check that the system has IPv6 enabled before checking the resolver */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD)
/* an ipv6 address was requested and we can't get/use one */
/* an IPv6 address was requested and we can't get/use one */
rc = -1;
else {
sclose(s);

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@ -23,7 +23,7 @@
/* Purpose
*
* 1. Accept a TCP connection on a custom port (ipv4 or ipv6), or connect
* 1. Accept a TCP connection on a custom port (IPv4 or IPv6), or connect
* to a given (localhost) port.
*
* 2. Get commands on STDIN. Pass data on to the TCP stream.