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Diffstat (limited to 'docs/FAQ')
| -rw-r--r-- | docs/FAQ | 86 |
1 files changed, 60 insertions, 26 deletions
@@ -6,8 +6,7 @@ FAQ -Problems connecting to SSL servers. -=================================== +1. Problems connecting to SSL servers. It took a very long time before I could sort out why curl had problems to connect to certain SSL servers when using SSLeay or OpenSSL v0.9+. @@ -22,23 +21,37 @@ Problems connecting to SSL servers. I have also seen examples where the remote server didn't like the SSLv2 request and instead you had to force curl to use SSLv3 with -3/--sslv3. -Does curl support resume? -========================= +2. curl: (1) SSL is disabled, https: not supported + + If you get this output when trying to get anything from a https:// server, + it means that the configure script couldn't find all libs and include files + it requires for SSL to work. If the configure script fails to find them, + curl is simply built without SSL support. + + To get the https:// support into a curl that was previously built but that + reports that https:// is not supported, you should dig through the document + and logs and check out why the configure script doesn't find the SSL libs + and/or include files. + + Also, check out the other paragraph in this FAQ labeled "configure doesn't + find OpenSSL even when it is installed". + +3. Does curl support resume? Yes. Both ways on FTP, download ways on HTTP. -Is libcurl thread safe? -======================= +4. Is libcurl thread safe? - Yes, as far as curl's own code goes. It does use system calls that often - aren't thread safe in most environments, such as gethostbyname(). + As version seven is slowly marching in as the libcurl version to use, we + have made a serious attempt to address all places in the code where we could + forsee problems for multi-threaded programs. If your system has them, curl + will attempt to use threadsafe functions instead of non-safe ones. I am very interested in once and for all getting some kind of report or README file from those who have used libcurl in a threaded environment, since I haven't and I get this question more and more frequently! -Why doesn't my posting using -F work? -===================================== +5. Why doesn't my posting using -F work? You can't simply use -F or -d at your choice. The web server that will receive your post assumes one of the formats. If the form you're trying to @@ -46,8 +59,12 @@ Why doesn't my posting using -F work? use the -F type. In all the most common cases, you should use -d which then causes a posting with the type 'application/x-www-form-urlencoded'. -Does curl support custom FTP commands? -====================================== + I have described this in some detail in the README.curl file, and if you + don't understand it the first time, read it again before you post questions + about this to the mailing list. I would also suggest that you read through + the mailing list archives for old postings and questions regarding this. + +6. Does curl support custom FTP commands? Yes it does, you can tell curl to perform optional commands both before and/or after a file transfer. Study the -Q/--quote option. @@ -56,8 +73,7 @@ Does curl support custom FTP commands? ftp commands without transfering anything. Therefore you must always specify a URL to transfer to/from even when doing custom FTP commands. -Does curl work with other SSL libraries? -======================================== +7. Does curl work with other SSL libraries? Curl has been written to use OpenSSL, although I doubt there would be much problems using a different library. I just don't know any other free one and @@ -66,20 +82,38 @@ Does curl work with other SSL libraries? If anyone does "port" curl to use a commercial SSL library, I am of course very interested in getting the patch! -configre doesn't find OpenSSL even when it is installed -======================================================= +8. configure doesn't find OpenSSL even when it is installed + + This may be because of several reasons. + + 8.1. native linker doesn't find openssl + + Platforms: Solaris (native cc compiler) and HPUX (native cc compiler) + + When configuring curl, I specify --with-ssl. OpenSSL is installed in + /usr/local/ssl Configure reports SSL in /usr/local/ssl, but fails to find + CRYPTO_lock in -lcrypto + + Cause: The cc for this test places the -L/usr/local/ssl/lib AFTER + -lcrypto, so ld can't find the library. This is due to a bug in the GNU + autoconf tool. + + Workaround: Specifying "LDFLAGS=-L/usr/local/ssl/lib" in front of + ./configure places the -L/usr/local/ssl/lib early enough in the command + line to make things work + + Submitted by: Bob Allison <allisonb@users.sourceforge.net> - Platforms: Solaris (native cc compiler) and HPUX (native cc compiler) + 8.2. only the libssl lib is missing - When configuring curl, I specify --with-ssl. OpenSSL is installed in - /usr/local/ssl Configure reports SSL in /usr/local/ssl, but fails to find - CRYPTO_lock in -lcrypto + If all include files and the libcrypto lib is present, with only the + libssl being missing according to configure, this is mostly likely because + a few functions are left out from the libssl. - Cause: The cc for this test places the -L/usr/local/ssl/lib AFTER -lcrypto, - so ld can't find the library. This is due to a bug in the GNU autoconf tool. + If the function names missing include RSA or RSAREF you can be certain + that this is because libssl requires the RSA and RSASEF libs to build. - Workaround: Specifying "LDFLAGS=-L/usr/local/ssl/lib" in front of ./configure - places the -L/usr/local/ssl/lib early enough in the command line to make - things work + See the INSTALL file section that explains how to add those libs to + configure. Make sure that you remove the config.cache file before you + rerun configure with the new flags. - Submitted by: Bob Allison <allisonb@users.sourceforge.net> |