From: Daniel Stenberg Date: Fri, 24 Aug 2007 14:00:42 +0000 (+0000) Subject: Bug report #1779054 (http://curl.haxx.se/bug/view.cgi?id=1779054) pointed X-Git-Tag: upstream/7.37.1~8754 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7cba40b21831b54c9a36fce40209c49fd7e4aa00;p=platform%2Fupstream%2Fcurl.git Bug report #1779054 (curl.haxx.se/bug/view.cgi?id=1779054) pointed out that libcurl didn't deal with large responses from server commands, when the single response was consisting of multiple lines but of a total size of 16KB or more. Dan Fandrich improved the ftp test script and provided test case 1006 to repeat the problem, and I fixed the code to make sure this new test case runs fine. --- diff --git a/CHANGES b/CHANGES index 9008ed9..e934fe8 100644 --- a/CHANGES +++ b/CHANGES @@ -6,6 +6,14 @@ Changelog +Daniel S (24 August 2007) +- Bug report #1779054 (http://curl.haxx.se/bug/view.cgi?id=1779054) pointed + out that libcurl didn't deal with large responses from server commands, when + the single response was consisting of multiple lines but of a total size of + 16KB or more. Dan Fandrich improved the ftp test script and provided test + case 1006 to repeat the problem, and I fixed the code to make sure this new + test case runs fine. + Patrick M (23 August 2007) - OS/400 port: new files lib/config-os400.h lib/setup-os400.h packages/OS400/*. See packages/OS400/README.OS400. diff --git a/RELEASE-NOTES b/RELEASE-NOTES index 69c0144..5f5aa4d 100644 --- a/RELEASE-NOTES +++ b/RELEASE-NOTES @@ -45,7 +45,7 @@ This release includes the following bugfixes: o resume HTTP PUT using Digest authentication o FTP NOBODY requests on directories sent "SIZE (null)" o FTP NOBODY request on file crash - o excessively long FTP server response lines + o excessively long FTP server responses and response lines o file:// upload then FTP:// upload crash This release includes the following known bugs: diff --git a/lib/ftp.c b/lib/ftp.c index 8ecdca6..7d00b7c 100644 --- a/lib/ftp.c +++ b/lib/ftp.c @@ -343,7 +343,7 @@ static CURLcode ftp_readresp(curl_socket_t sockfd, conn->data_prot = 0; #endif res = Curl_read(conn, sockfd, ptr, BUFSIZE-ftpc->nread_resp, - &gotbytes); + &gotbytes); #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI) conn->data_prot = prot; #endif @@ -387,7 +387,7 @@ static CURLcode ftp_readresp(curl_socket_t sockfd, /* output debug output if that is requested */ #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI) - if(!conn->sec_complete) + if(!conn->sec_complete) #endif if(data->set.verbose) Curl_debug(data, CURLINFO_HEADER_IN, @@ -424,6 +424,7 @@ static CURLcode ftp_readresp(curl_socket_t sockfd, ftpc->linestart_resp = ptr+1; } } + if(!keepon && (i != gotbytes)) { /* We found the end of the response lines, but we didn't parse the full chunk of data we have read from the server. We therefore need @@ -436,26 +437,45 @@ static CURLcode ftp_readresp(curl_socket_t sockfd, else return CURLE_OUT_OF_MEMORY; /**BANG**/ } - else if(keepon && (i == gotbytes) && (gotbytes > BUFSIZE/2)) { - /* We got an excessive line without newlines and we need to deal - with it. First, check if it seems to start with a valid status - code and then we keep just that in the line cache. Then throw - away the rest. */ - infof(data, "Excessive FTP response line length received, %zd bytes." - " Stripping\n", gotbytes); - if(STATUSCODE(ftpc->linestart_resp)) { - ftpc->cache_size = 4; /* we copy 4 bytes since after the three-digit - number there is a dash or a space and it - is significant */ - ftpc->cache = (char *)malloc((int)ftpc->cache_size); - if(ftpc->cache) - memcpy(ftpc->cache, ftpc->linestart_resp, (int)ftpc->cache_size); - else - return CURLE_OUT_OF_MEMORY; + else if(keepon) { + int clipamount = 0; + bool restart = FALSE; + + if((perline == gotbytes) && (gotbytes > BUFSIZE/2)) { + /* We got an excessive line without newlines and we need to deal + with it. First, check if it seems to start with a valid status + code and then we keep just that in the line cache. Then throw + away the rest. */ + infof(data, "Excessive FTP response line length received, %zd bytes." + " Stripping\n", gotbytes); + restart = TRUE; + if(STATUSCODE(ftpc->linestart_resp)) + /* we copy 4 bytes since after the three-digit number there is a + dash or a space and it is significant */ + clipamount = 4; + } + else if(perline && (ftpc->nread_resp > BUFSIZE/2)) { + /* We got a large chunk of data and there's still trailing data to + take care of, so we put that part in the "cache" and restart */ + clipamount = perline; + restart = TRUE; + } + + if(restart) { + if(clipamount) { + ftpc->cache_size = clipamount; + ftpc->cache = (char *)malloc((int)ftpc->cache_size); + if(ftpc->cache) + memcpy(ftpc->cache, ftpc->linestart_resp, (int)ftpc->cache_size); + else + return CURLE_OUT_OF_MEMORY; + } + /* now reset a few variables to start over nicely from the start of + the big buffer */ + ftpc->nread_resp = 0; /* start over from scratch in the buffer */ + ptr = ftpc->linestart_resp = buf; + perline = 0; } - /* now we forget what we read and get a new chunk in the next loop - and append to the small piece we might have put in the cache */ - ftpc->nread_resp = 0; } } /* there was data */ @@ -603,16 +623,16 @@ CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */ ftpc->cache_size = 0; /* zero the size just in case */ } else { - int res; + int res; #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI) - enum protection_level prot = conn->data_prot; + enum protection_level prot = conn->data_prot; - conn->data_prot = 0; + conn->data_prot = 0; #endif - res = Curl_read(conn, sockfd, ptr, BUFSIZE-*nreadp, - &gotbytes); + res = Curl_read(conn, sockfd, ptr, BUFSIZE-*nreadp, + &gotbytes); #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI) - conn->data_prot = prot; + conn->data_prot = prot; #endif if(res < 0) /* EWOULDBLOCK */ @@ -654,7 +674,7 @@ CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */ /* output debug output if that is requested */ #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI) - if(!conn->sec_complete) + if(!conn->sec_complete) #endif if(data->set.verbose) Curl_debug(data, CURLINFO_HEADER_IN, @@ -2538,7 +2558,7 @@ static CURLcode ftp_statemach_act(struct connectdata *conn) Curl_sec_request_prot(conn, "private"); /* We set private first as default, in case the line below fails to set a valid level */ - Curl_sec_request_prot(conn, data->set.str[STRING_KRB_LEVEL]); + Curl_sec_request_prot(conn, data->set.str[STRING_KRB_LEVEL]); if(Curl_sec_login(conn) != 0) infof(data, "Logging in with password in cleartext!\n"); @@ -2673,13 +2693,13 @@ static CURLcode ftp_statemach_act(struct connectdata *conn) case FTP_CCC: if (ftpcode < 500) { - /* First shut down the SSL layer (note: this call will block) */ - result = Curl_ssl_shutdown(conn, FIRSTSOCKET); + /* First shut down the SSL layer (note: this call will block) */ + result = Curl_ssl_shutdown(conn, FIRSTSOCKET); - if(result) { - failf(conn->data, "Failed to clear the command channel (CCC)"); - return result; - } + if(result) { + failf(conn->data, "Failed to clear the command channel (CCC)"); + return result; + } } /* Then continue as normal */ @@ -3143,8 +3163,8 @@ CURLcode Curl_ftp_done(struct connectdata *conn, CURLcode status, bool premature if(dlen && !ftpc->cwdfail) { ftpc->prevpath = path; if(flen) - /* if 'path' is not the whole string */ - ftpc->prevpath[dlen]=0; /* terminate */ + /* if 'path' is not the whole string */ + ftpc->prevpath[dlen]=0; /* terminate */ infof(data, "Remembering we are in dir %s\n", ftpc->prevpath); } else { diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am index aca45a3..5506cf2 100644 --- a/tests/data/Makefile.am +++ b/tests/data/Makefile.am @@ -43,4 +43,4 @@ EXTRA_DIST = test1 test108 test117 test127 test20 test27 test34 test46 \ test296 test297 test298 test610 test611 test612 test406 test407 test408 \ test409 test613 test614 test700 test701 test702 test704 test705 test703 \ test706 test707 test350 test351 test352 test353 test289 test540 test354 \ - test231 test1000 test1001 test1002 test1003 test1004 test1005 + test231 test1000 test1001 test1002 test1003 test1004 test1005 test1006 diff --git a/tests/data/test1006 b/tests/data/test1006 new file mode 100644 index 0000000..b37f807 --- /dev/null +++ b/tests/data/test1006 @@ -0,0 +1,49 @@ + + + +FTP +RETR +huge response + + +# Server-side + + +mooo + +# A long set of response strings to CWD to make sure the ftp parser deals +# with it nicely. The length hits a boundary condition that may make curl +# hang. + +REPLY CWD 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Finally, here is the response + + + +# Client-side + + +ftp + + +FTP with excessively large number of server command response lines (boundary condition) + + +ftp://%HOSTIP:%FTPPORT/path/1006 + + + +# Verify data after the test has been "shot" + + +USER anonymous +PASS ftp@example.com +PWD +CWD path +EPSV +TYPE I +SIZE 1006 +RETR 1006 +QUIT + + +