Line data Source code
1 : // Copyright (c) 2006, Google Inc.
2 : // All rights reserved.
3 : //
4 : // Redistribution and use in source and binary forms, with or without
5 : // modification, are permitted provided that the following conditions are
6 : // met:
7 : //
8 : // * Redistributions of source code must retain the above copyright
9 : // notice, this list of conditions and the following disclaimer.
10 : // * Redistributions in binary form must reproduce the above
11 : // copyright notice, this list of conditions and the following disclaimer
12 : // in the documentation and/or other materials provided with the
13 : // distribution.
14 : // * Neither the name of Google Inc. nor the names of its
15 : // contributors may be used to endorse or promote products derived from
16 : // this software without specific prior written permission.
17 : //
18 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 :
30 : #include "common/linux/http_upload.h"
31 :
32 : #include <assert.h>
33 : #include <dlfcn.h>
34 : #include "third_party/curl/curl.h"
35 :
36 : namespace {
37 :
38 : // Callback to get the response data from server.
39 0 : static size_t WriteCallback(void *ptr, size_t size,
40 : size_t nmemb, void *userp) {
41 0 : if (!userp)
42 0 : return 0;
43 :
44 0 : string *response = reinterpret_cast<string *>(userp);
45 0 : size_t real_size = size * nmemb;
46 0 : response->append(reinterpret_cast<char *>(ptr), real_size);
47 0 : return real_size;
48 : }
49 :
50 : } // namespace
51 :
52 : namespace google_breakpad {
53 :
54 : static const char kUserAgent[] = "Breakpad/1.0 (Linux)";
55 :
56 : // static
57 0 : bool HTTPUpload::SendRequest(const string &url,
58 : const map<string, string> ¶meters,
59 : const map<string, string> &files,
60 : const string &proxy,
61 : const string &proxy_user_pwd,
62 : const string &ca_certificate_file,
63 : string *response_body,
64 : long *response_code,
65 : string *error_description) {
66 0 : if (response_code != NULL)
67 0 : *response_code = 0;
68 :
69 0 : if (!CheckParameters(parameters))
70 0 : return false;
71 :
72 : // We may have been linked statically; if curl_easy_init is in the
73 : // current binary, no need to search for a dynamic version.
74 0 : void* curl_lib = dlopen(NULL, RTLD_NOW);
75 0 : if (!CheckCurlLib(curl_lib)) {
76 : fprintf(stderr,
77 0 : "Failed to open curl lib from binary, use libcurl.so instead\n");
78 0 : dlerror(); // Clear dlerror before attempting to open libraries.
79 0 : dlclose(curl_lib);
80 0 : curl_lib = NULL;
81 : }
82 0 : if (!curl_lib) {
83 0 : curl_lib = dlopen("libcurl.so", RTLD_NOW);
84 : }
85 0 : if (!curl_lib) {
86 0 : if (error_description != NULL)
87 0 : *error_description = dlerror();
88 0 : curl_lib = dlopen("libcurl.so.4", RTLD_NOW);
89 : }
90 0 : if (!curl_lib) {
91 : // Debian gives libcurl a different name when it is built against GnuTLS
92 : // instead of OpenSSL.
93 0 : curl_lib = dlopen("libcurl-gnutls.so.4", RTLD_NOW);
94 : }
95 0 : if (!curl_lib) {
96 0 : curl_lib = dlopen("libcurl.so.3", RTLD_NOW);
97 : }
98 0 : if (!curl_lib) {
99 0 : return false;
100 : }
101 :
102 : CURL* (*curl_easy_init)(void);
103 0 : *(void**) (&curl_easy_init) = dlsym(curl_lib, "curl_easy_init");
104 0 : CURL *curl = (*curl_easy_init)();
105 0 : if (error_description != NULL)
106 0 : *error_description = "No Error";
107 :
108 0 : if (!curl) {
109 0 : dlclose(curl_lib);
110 0 : return false;
111 : }
112 :
113 0 : CURLcode err_code = CURLE_OK;
114 : CURLcode (*curl_easy_setopt)(CURL *, CURLoption, ...);
115 0 : *(void**) (&curl_easy_setopt) = dlsym(curl_lib, "curl_easy_setopt");
116 0 : (*curl_easy_setopt)(curl, CURLOPT_URL, url.c_str());
117 0 : (*curl_easy_setopt)(curl, CURLOPT_USERAGENT, kUserAgent);
118 : // Support multithread by disabling timeout handling, would get SIGSEGV with
119 : // Curl_resolv_timeout in stack trace otherwise.
120 : // See https://curl.haxx.se/libcurl/c/threadsafe.html
121 0 : (*curl_easy_setopt)(curl, CURLOPT_NOSIGNAL, 1);
122 : // Set proxy information if necessary.
123 0 : if (!proxy.empty())
124 0 : (*curl_easy_setopt)(curl, CURLOPT_PROXY, proxy.c_str());
125 0 : if (!proxy_user_pwd.empty())
126 0 : (*curl_easy_setopt)(curl, CURLOPT_PROXYUSERPWD, proxy_user_pwd.c_str());
127 :
128 0 : if (!ca_certificate_file.empty())
129 0 : (*curl_easy_setopt)(curl, CURLOPT_CAINFO, ca_certificate_file.c_str());
130 :
131 0 : struct curl_httppost *formpost = NULL;
132 0 : struct curl_httppost *lastptr = NULL;
133 : // Add form data.
134 : CURLFORMcode (*curl_formadd)(struct curl_httppost **, struct curl_httppost **, ...);
135 0 : *(void**) (&curl_formadd) = dlsym(curl_lib, "curl_formadd");
136 0 : map<string, string>::const_iterator iter = parameters.begin();
137 0 : for (; iter != parameters.end(); ++iter)
138 0 : (*curl_formadd)(&formpost, &lastptr,
139 0 : CURLFORM_COPYNAME, iter->first.c_str(),
140 0 : CURLFORM_COPYCONTENTS, iter->second.c_str(),
141 0 : CURLFORM_END);
142 :
143 : // Add form files.
144 0 : for (iter = files.begin(); iter != files.end(); ++iter) {
145 0 : (*curl_formadd)(&formpost, &lastptr,
146 0 : CURLFORM_COPYNAME, iter->first.c_str(),
147 0 : CURLFORM_FILE, iter->second.c_str(),
148 0 : CURLFORM_END);
149 : }
150 :
151 0 : (*curl_easy_setopt)(curl, CURLOPT_HTTPPOST, formpost);
152 :
153 : // Disable 100-continue header.
154 0 : struct curl_slist *headerlist = NULL;
155 0 : char buf[] = "Expect:";
156 : struct curl_slist* (*curl_slist_append)(struct curl_slist *, const char *);
157 0 : *(void**) (&curl_slist_append) = dlsym(curl_lib, "curl_slist_append");
158 0 : headerlist = (*curl_slist_append)(headerlist, buf);
159 0 : (*curl_easy_setopt)(curl, CURLOPT_HTTPHEADER, headerlist);
160 :
161 0 : if (response_body != NULL) {
162 0 : (*curl_easy_setopt)(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
163 : (*curl_easy_setopt)(curl, CURLOPT_WRITEDATA,
164 0 : reinterpret_cast<void *>(response_body));
165 : }
166 :
167 : // Fail if 400+ is returned from the web server.
168 0 : (*curl_easy_setopt)(curl, CURLOPT_FAILONERROR, 1);
169 :
170 : CURLcode (*curl_easy_perform)(CURL *);
171 0 : *(void**) (&curl_easy_perform) = dlsym(curl_lib, "curl_easy_perform");
172 0 : err_code = (*curl_easy_perform)(curl);
173 0 : if (response_code != NULL) {
174 : CURLcode (*curl_easy_getinfo)(CURL *, CURLINFO, ...);
175 0 : *(void**) (&curl_easy_getinfo) = dlsym(curl_lib, "curl_easy_getinfo");
176 0 : (*curl_easy_getinfo)(curl, CURLINFO_RESPONSE_CODE, response_code);
177 : }
178 : const char* (*curl_easy_strerror)(CURLcode);
179 0 : *(void**) (&curl_easy_strerror) = dlsym(curl_lib, "curl_easy_strerror");
180 : #ifndef NDEBUG
181 0 : if (err_code != CURLE_OK)
182 0 : fprintf(stderr, "Failed to send http request to %s, error: %s\n",
183 : url.c_str(),
184 0 : (*curl_easy_strerror)(err_code));
185 : #endif
186 0 : if (error_description != NULL)
187 0 : *error_description = (*curl_easy_strerror)(err_code);
188 :
189 : void (*curl_easy_cleanup)(CURL *);
190 0 : *(void**) (&curl_easy_cleanup) = dlsym(curl_lib, "curl_easy_cleanup");
191 0 : (*curl_easy_cleanup)(curl);
192 0 : if (formpost != NULL) {
193 : void (*curl_formfree)(struct curl_httppost *);
194 0 : *(void**) (&curl_formfree) = dlsym(curl_lib, "curl_formfree");
195 0 : (*curl_formfree)(formpost);
196 : }
197 0 : if (headerlist != NULL) {
198 : void (*curl_slist_free_all)(struct curl_slist *);
199 0 : *(void**) (&curl_slist_free_all) = dlsym(curl_lib, "curl_slist_free_all");
200 0 : (*curl_slist_free_all)(headerlist);
201 : }
202 0 : dlclose(curl_lib);
203 0 : return err_code == CURLE_OK;
204 : }
205 :
206 : // static
207 0 : bool HTTPUpload::CheckCurlLib(void* curl_lib) {
208 0 : return curl_lib &&
209 0 : dlsym(curl_lib, "curl_easy_init") &&
210 0 : dlsym(curl_lib, "curl_easy_setopt");
211 : }
212 :
213 : // static
214 0 : bool HTTPUpload::CheckParameters(const map<string, string> ¶meters) {
215 0 : for (map<string, string>::const_iterator pos = parameters.begin();
216 0 : pos != parameters.end(); ++pos) {
217 0 : const string &str = pos->first;
218 0 : if (str.size() == 0)
219 0 : return false; // disallow empty parameter names
220 0 : for (unsigned int i = 0; i < str.size(); ++i) {
221 0 : int c = str[i];
222 0 : if (c < 32 || c == '"' || c > 127) {
223 0 : return false;
224 : }
225 : }
226 : }
227 0 : return true;
228 : }
229 :
230 : } // namespace google_breakpad
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