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 #if defined(__AMIGA__)
67 #if defined(__GNUC__)
68 #define CURL_USED __attribute__((used))
69 #else
70 #define CURL_USED
71 #endif
72 static const char CURL_USED min_stack[] = "$STACK:16384";
73 #endif
74
75 #ifdef __MINGW32__
76 /*
77 * There seems to be no way to escape "*" in command-line arguments with MinGW
78 * when command-line argument globbing is enabled under the MSYS shell, so turn
79 * it off.
80 */
81 extern int _CRT_glob;
82 int _CRT_glob = 0;
83 #endif /* __MINGW32__ */
84
85 /* if we build a static library for unit tests, there is no main() function */
86 #ifndef UNITTESTS
87
88 #if defined(HAVE_PIPE) && defined(HAVE_FCNTL)
89 /*
90 * Ensure that file descriptors 0, 1 and 2 (stdin, stdout, stderr) are
91 * open before starting to run. Otherwise, the first three network
92 * sockets opened by curl could be used for input sources, downloaded data
93 * or error logs as they will effectively be stdin, stdout and/or stderr.
94 *
95 * fcntl's F_GETFD instruction returns -1 if the file descriptor is closed,
96 * otherwise it returns "the file descriptor flags (which typically can only
97 * be FD_CLOEXEC, which is not set here).
98 */
main_checkfds(void)99 static int main_checkfds(void)
100 {
101 int fd[2];
102 while((fcntl(STDIN_FILENO, F_GETFD) == -1) ||
103 (fcntl(STDOUT_FILENO, F_GETFD) == -1) ||
104 (fcntl(STDERR_FILENO, F_GETFD) == -1))
105 if(pipe(fd))
106 return 1;
107 return 0;
108 }
109 #else
110 #define main_checkfds() 0
111 #endif
112
113 #ifdef CURLDEBUG
memory_tracking_init(void)114 static void memory_tracking_init(void)
115 {
116 char *env;
117 /* if CURL_MEMDEBUG is set, this starts memory tracking message logging */
118 env = curl_getenv("CURL_MEMDEBUG");
119 if(env) {
120 /* use the value as filename */
121 char fname[CURL_MT_LOGFNAME_BUFSIZE];
122 if(strlen(env) >= CURL_MT_LOGFNAME_BUFSIZE)
123 env[CURL_MT_LOGFNAME_BUFSIZE-1] = '\0';
124 strcpy(fname, env);
125 curl_free(env);
126 curl_dbg_memdebug(fname);
127 /* this weird stuff here is to make curl_free() get called before
128 curl_dbg_memdebug() as otherwise memory tracking will log a free()
129 without an alloc! */
130 }
131 /* if CURL_MEMLIMIT is set, this enables fail-on-alloc-number-N feature */
132 env = curl_getenv("CURL_MEMLIMIT");
133 if(env) {
134 char *endptr;
135 long num = strtol(env, &endptr, 10);
136 if((endptr != env) && (endptr == env + strlen(env)) && (num > 0))
137 curl_dbg_memlimit(num);
138 curl_free(env);
139 }
140 }
141 #else
142 # define memory_tracking_init() Curl_nop_stmt
143 #endif
144
145 /*
146 * This is the main global constructor for the app. Call this before
147 * _any_ libcurl usage. If this fails, *NO* libcurl functions may be
148 * used, or havoc may be the result.
149 */
main_init(struct GlobalConfig * config)150 static CURLcode main_init(struct GlobalConfig *config)
151 {
152 CURLcode result = CURLE_OK;
153
154 #ifdef __DJGPP__
155 /* stop stat() wasting time */
156 _djstat_flags |= _STAT_INODE | _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
157 #endif
158
159 /* Initialise the global config */
160 config->showerror = FALSE; /* show errors when silent */
161 config->styled_output = TRUE; /* enable detection */
162 config->parallel_max = PARALLEL_DEFAULT;
163
164 /* Allocate the initial operate config */
165 config->first = config->last = malloc(sizeof(struct OperationConfig));
166 if(config->first) {
167 /* Perform the libcurl initialization */
168 result = curl_global_init(CURL_GLOBAL_DEFAULT);
169 if(!result) {
170 /* Get information about libcurl */
171 result = get_libcurl_info();
172
173 if(!result) {
174 /* Initialise the config */
175 config_init(config->first);
176 config->first->global = config;
177 }
178 else {
179 errorf(config, "error retrieving curl library information");
180 free(config->first);
181 }
182 }
183 else {
184 errorf(config, "error initializing curl library");
185 free(config->first);
186 }
187 }
188 else {
189 errorf(config, "error initializing curl");
190 result = CURLE_FAILED_INIT;
191 }
192
193 return result;
194 }
195
free_globalconfig(struct GlobalConfig * config)196 static void free_globalconfig(struct GlobalConfig *config)
197 {
198 Curl_safefree(config->trace_dump);
199
200 if(config->trace_fopened && config->trace_stream)
201 fclose(config->trace_stream);
202 config->trace_stream = NULL;
203
204 Curl_safefree(config->libcurl);
205 }
206
207 /*
208 * This is the main global destructor for the app. Call this after
209 * _all_ libcurl usage is done.
210 */
main_free(struct GlobalConfig * config)211 static void main_free(struct GlobalConfig *config)
212 {
213 /* Cleanup the easy handle */
214 /* Main cleanup */
215 curl_global_cleanup();
216 free_globalconfig(config);
217
218 /* Free the config structures */
219 config_free(config->last);
220 config->first = NULL;
221 config->last = NULL;
222 }
223
224 /*
225 ** curl tool main function.
226 */
227 #ifdef _UNICODE
228 #if defined(__GNUC__) || defined(__clang__)
229 /* GCC does not know about wmain() */
230 #pragma GCC diagnostic push
231 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
232 #pragma GCC diagnostic ignored "-Wmissing-declarations"
233 #endif
wmain(int argc,wchar_t * argv[])234 int wmain(int argc, wchar_t *argv[])
235 #else
236 int main(int argc, char *argv[])
237 #endif
238 {
239 CURLcode result = CURLE_OK;
240 struct GlobalConfig global;
241 memset(&global, 0, sizeof(global));
242
243 tool_init_stderr();
244
245 #ifdef _WIN32
246 /* Undocumented diagnostic option to list the full paths of all loaded
247 modules. This is purposely pre-init. */
248 if(argc == 2 && !_tcscmp(argv[1], _T("--dump-module-paths"))) {
249 struct curl_slist *item, *head = GetLoadedModulePaths();
250 for(item = head; item; item = item->next)
251 printf("%s\n", item->data);
252 curl_slist_free_all(head);
253 return head ? 0 : 1;
254 }
255 /* win32_init must be called before other init routines. */
256 result = win32_init();
257 if(result) {
258 errorf(&global, "(%d) Windows-specific init failed", result);
259 return (int)result;
260 }
261 #endif
262
263 if(main_checkfds()) {
264 errorf(&global, "out of file descriptors");
265 return CURLE_FAILED_INIT;
266 }
267
268 #if defined(HAVE_SIGNAL) && defined(SIGPIPE)
269 (void)signal(SIGPIPE, SIG_IGN);
270 #endif
271
272 /* Initialize memory tracking */
273 memory_tracking_init();
274
275 /* Initialize the curl library - do not call any libcurl functions before
276 this point */
277 result = main_init(&global);
278 if(!result) {
279 /* Start our curl operation */
280 result = operate(&global, argc, argv);
281
282 /* Perform the main cleanup */
283 main_free(&global);
284 }
285
286 #ifdef _WIN32
287 /* Flush buffers of all streams opened in write or update mode */
288 fflush(NULL);
289 #endif
290
291 #ifdef __VMS
292 vms_special_exit(result, vms_show);
293 #else
294 return (int)result;
295 #endif
296 }
297
298 #ifdef _UNICODE
299 #if defined(__GNUC__) || defined(__clang__)
300 #pragma GCC diagnostic pop
301 #endif
302 #endif
303
304 #endif /* ndef UNITTESTS */
305