1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include "tool_setup.h"
25
26 #include <sys/stat.h>
27
28 #ifdef _WIN32
29 #include <tchar.h>
30 #endif
31
32 #include <signal.h>
33
34 #ifdef HAVE_FCNTL_H
35 #include <fcntl.h>
36 #endif
37
38 #include "curlx.h"
39
40 #include "tool_cfgable.h"
41 #include "tool_doswin.h"
42 #include "tool_msgs.h"
43 #include "tool_operate.h"
44 #include "tool_vms.h"
45 #include "tool_main.h"
46 #include "tool_libinfo.h"
47 #include "tool_stderr.h"
48
49 /*
50 * This is low-level hard-hacking memory leak tracking and similar. Using
51 * the library level code from this client-side is ugly, but we do this
52 * anyway for convenience.
53 */
54 #include "memdebug.h" /* keep this as LAST include */
55
56 #ifdef __VMS
57 /*
58 * vms_show is a global variable, used in main() as parameter for
59 * function vms_special_exit() to allow proper curl tool exiting.
60 * Its value may be set in other tool_*.c source files thanks to
61 * forward declaration present in tool_vms.h
62 */
63 int vms_show = 0;
64 #endif
65
66 #ifdef __MINGW32__
67 /*
68 * There seems to be no way to escape "*" in command-line arguments with MinGW
69 * when command-line argument globbing is enabled under the MSYS shell, so turn
70 * it off.
71 */
72 extern int _CRT_glob;
73 int _CRT_glob = 0;
74 #endif /* __MINGW32__ */
75
76 /* if we build a static library for unit tests, there is no main() function */
77 #ifndef UNITTESTS
78
79 #if defined(HAVE_PIPE) && defined(HAVE_FCNTL)
80 /*
81 * Ensure that file descriptors 0, 1 and 2 (stdin, stdout, stderr) are
82 * open before starting to run. Otherwise, the first three network
83 * sockets opened by curl could be used for input sources, downloaded data
84 * or error logs as they will effectively be stdin, stdout and/or stderr.
85 *
86 * fcntl's F_GETFD instruction returns -1 if the file descriptor is closed,
87 * otherwise it returns "the file descriptor flags (which typically can only
88 * be FD_CLOEXEC, which is not set here).
89 */
main_checkfds(void)90 static int main_checkfds(void)
91 {
92 int fd[2];
93 while((fcntl(STDIN_FILENO, F_GETFD) == -1) ||
94 (fcntl(STDOUT_FILENO, F_GETFD) == -1) ||
95 (fcntl(STDERR_FILENO, F_GETFD) == -1))
96 if(pipe(fd))
97 return 1;
98 return 0;
99 }
100 #else
101 #define main_checkfds() 0
102 #endif
103
104 #ifdef CURLDEBUG
memory_tracking_init(void)105 static void memory_tracking_init(void)
106 {
107 char *env;
108 /* if CURL_MEMDEBUG is set, this starts memory tracking message logging */
109 env = curl_getenv("CURL_MEMDEBUG");
110 if(env) {
111 /* use the value as filename */
112 char fname[CURL_MT_LOGFNAME_BUFSIZE];
113 if(strlen(env) >= CURL_MT_LOGFNAME_BUFSIZE)
114 env[CURL_MT_LOGFNAME_BUFSIZE-1] = '\0';
115 strcpy(fname, env);
116 curl_free(env);
117 curl_dbg_memdebug(fname);
118 /* this weird stuff here is to make curl_free() get called before
119 curl_dbg_memdebug() as otherwise memory tracking will log a free()
120 without an alloc! */
121 }
122 /* if CURL_MEMLIMIT is set, this enables fail-on-alloc-number-N feature */
123 env = curl_getenv("CURL_MEMLIMIT");
124 if(env) {
125 char *endptr;
126 long num = strtol(env, &endptr, 10);
127 if((endptr != env) && (endptr == env + strlen(env)) && (num > 0))
128 curl_dbg_memlimit(num);
129 curl_free(env);
130 }
131 }
132 #else
133 # define memory_tracking_init() Curl_nop_stmt
134 #endif
135
136 /*
137 * This is the main global constructor for the app. Call this before
138 * _any_ libcurl usage. If this fails, *NO* libcurl functions may be
139 * used, or havoc may be the result.
140 */
main_init(struct GlobalConfig * config)141 static CURLcode main_init(struct GlobalConfig *config)
142 {
143 CURLcode result = CURLE_OK;
144
145 #if defined(__DJGPP__) || defined(__GO32__)
146 /* stop stat() wasting time */
147 _djstat_flags |= _STAT_INODE | _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
148 #endif
149
150 /* Initialise the global config */
151 config->showerror = FALSE; /* show errors when silent */
152 config->styled_output = TRUE; /* enable detection */
153 config->parallel_max = PARALLEL_DEFAULT;
154
155 /* Allocate the initial operate config */
156 config->first = config->last = malloc(sizeof(struct OperationConfig));
157 if(config->first) {
158 /* Perform the libcurl initialization */
159 result = curl_global_init(CURL_GLOBAL_DEFAULT);
160 if(!result) {
161 /* Get information about libcurl */
162 result = get_libcurl_info();
163
164 if(!result) {
165 /* Initialise the config */
166 config_init(config->first);
167 config->first->global = config;
168 }
169 else {
170 errorf(config, "error retrieving curl library information");
171 free(config->first);
172 }
173 }
174 else {
175 errorf(config, "error initializing curl library");
176 free(config->first);
177 }
178 }
179 else {
180 errorf(config, "error initializing curl");
181 result = CURLE_FAILED_INIT;
182 }
183
184 return result;
185 }
186
free_globalconfig(struct GlobalConfig * config)187 static void free_globalconfig(struct GlobalConfig *config)
188 {
189 Curl_safefree(config->trace_dump);
190
191 if(config->trace_fopened && config->trace_stream)
192 fclose(config->trace_stream);
193 config->trace_stream = NULL;
194
195 Curl_safefree(config->libcurl);
196 }
197
198 /*
199 * This is the main global destructor for the app. Call this after
200 * _all_ libcurl usage is done.
201 */
main_free(struct GlobalConfig * config)202 static void main_free(struct GlobalConfig *config)
203 {
204 /* Cleanup the easy handle */
205 /* Main cleanup */
206 curl_global_cleanup();
207 free_globalconfig(config);
208
209 /* Free the config structures */
210 config_free(config->last);
211 config->first = NULL;
212 config->last = NULL;
213 }
214
215 /*
216 ** curl tool main function.
217 */
218 #ifdef _UNICODE
219 #if defined(__GNUC__) || defined(__clang__)
220 /* GCC does not know about wmain() */
221 #pragma GCC diagnostic push
222 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
223 #pragma GCC diagnostic ignored "-Wmissing-declarations"
224 #endif
wmain(int argc,wchar_t * argv[])225 int wmain(int argc, wchar_t *argv[])
226 #else
227 int main(int argc, char *argv[])
228 #endif
229 {
230 CURLcode result = CURLE_OK;
231 struct GlobalConfig global;
232 memset(&global, 0, sizeof(global));
233
234 tool_init_stderr();
235
236 #ifdef _WIN32
237 /* Undocumented diagnostic option to list the full paths of all loaded
238 modules. This is purposely pre-init. */
239 if(argc == 2 && !_tcscmp(argv[1], _T("--dump-module-paths"))) {
240 struct curl_slist *item, *head = GetLoadedModulePaths();
241 for(item = head; item; item = item->next)
242 printf("%s\n", item->data);
243 curl_slist_free_all(head);
244 return head ? 0 : 1;
245 }
246 /* win32_init must be called before other init routines. */
247 result = win32_init();
248 if(result) {
249 errorf(&global, "(%d) Windows-specific init failed", result);
250 return (int)result;
251 }
252 #endif
253
254 if(main_checkfds()) {
255 errorf(&global, "out of file descriptors");
256 return CURLE_FAILED_INIT;
257 }
258
259 #if defined(HAVE_SIGNAL) && defined(SIGPIPE)
260 (void)signal(SIGPIPE, SIG_IGN);
261 #endif
262
263 /* Initialize memory tracking */
264 memory_tracking_init();
265
266 /* Initialize the curl library - do not call any libcurl functions before
267 this point */
268 result = main_init(&global);
269 if(!result) {
270 /* Start our curl operation */
271 result = operate(&global, argc, argv);
272
273 /* Perform the main cleanup */
274 main_free(&global);
275 }
276
277 #ifdef _WIN32
278 /* Flush buffers of all streams opened in write or update mode */
279 fflush(NULL);
280 #endif
281
282 #ifdef __VMS
283 vms_special_exit(result, vms_show);
284 #else
285 return (int)result;
286 #endif
287 }
288
289 #ifdef _UNICODE
290 #if defined(__GNUC__) || defined(__clang__)
291 #pragma GCC diagnostic pop
292 #endif
293 #endif
294
295 #endif /* ndef UNITTESTS */
296
