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 #define ENABLE_CURLX_PRINTF
39 /* use our own printf() functions */
40 #include "curlx.h"
41
42 #include "tool_cfgable.h"
43 #include "tool_doswin.h"
44 #include "tool_msgs.h"
45 #include "tool_operate.h"
46 #include "tool_vms.h"
47 #include "tool_main.h"
48 #include "tool_libinfo.h"
49 #include "tool_stderr.h"
50
51 /*
52 * This is low-level hard-hacking memory leak tracking and similar. Using
53 * the library level code from this client-side is ugly, but we do this
54 * anyway for convenience.
55 */
56 #include "memdebug.h" /* keep this as LAST include */
57
58 #ifdef __VMS
59 /*
60 * vms_show is a global variable, used in main() as parameter for
61 * function vms_special_exit() to allow proper curl tool exiting.
62 * Its value may be set in other tool_*.c source files thanks to
63 * forward declaration present in tool_vms.h
64 */
65 int vms_show = 0;
66 #endif
67
68 #ifdef __MINGW32__
69 /*
70 * There seems to be no way to escape "*" in command-line arguments with MinGW
71 * when command-line argument globbing is enabled under the MSYS shell, so turn
72 * it off.
73 */
74 extern int _CRT_glob;
75 int _CRT_glob = 0;
76 #endif /* __MINGW32__ */
77
78 /* if we build a static library for unit tests, there is no main() function */
79 #ifndef UNITTESTS
80
81 #if defined(HAVE_PIPE) && defined(HAVE_FCNTL)
82 /*
83 * Ensure that file descriptors 0, 1 and 2 (stdin, stdout, stderr) are
84 * open before starting to run. Otherwise, the first three network
85 * sockets opened by curl could be used for input sources, downloaded data
86 * or error logs as they will effectively be stdin, stdout and/or stderr.
87 *
88 * fcntl's F_GETFD instruction returns -1 if the file descriptor is closed,
89 * otherwise it returns "the file descriptor flags (which typically can only
90 * be FD_CLOEXEC, which is not set here).
91 */
main_checkfds(void)92 static int main_checkfds(void)
93 {
94 int fd[2];
95 while((fcntl(STDIN_FILENO, F_GETFD) == -1) ||
96 (fcntl(STDOUT_FILENO, F_GETFD) == -1) ||
97 (fcntl(STDERR_FILENO, F_GETFD) == -1))
98 if(pipe(fd))
99 return 1;
100 return 0;
101 }
102 #else
103 #define main_checkfds() 0
104 #endif
105
106 #ifdef CURLDEBUG
memory_tracking_init(void)107 static void memory_tracking_init(void)
108 {
109 char *env;
110 /* if CURL_MEMDEBUG is set, this starts memory tracking message logging */
111 env = curl_getenv("CURL_MEMDEBUG");
112 if(env) {
113 /* use the value as file name */
114 char fname[CURL_MT_LOGFNAME_BUFSIZE];
115 if(strlen(env) >= CURL_MT_LOGFNAME_BUFSIZE)
116 env[CURL_MT_LOGFNAME_BUFSIZE-1] = '\0';
117 strcpy(fname, env);
118 curl_free(env);
119 curl_dbg_memdebug(fname);
120 /* this weird stuff here is to make curl_free() get called before
121 curl_dbg_memdebug() as otherwise memory tracking will log a free()
122 without an alloc! */
123 }
124 /* if CURL_MEMLIMIT is set, this enables fail-on-alloc-number-N feature */
125 env = curl_getenv("CURL_MEMLIMIT");
126 if(env) {
127 char *endptr;
128 long num = strtol(env, &endptr, 10);
129 if((endptr != env) && (endptr == env + strlen(env)) && (num > 0))
130 curl_dbg_memlimit(num);
131 curl_free(env);
132 }
133 }
134 #else
135 # define memory_tracking_init() Curl_nop_stmt
136 #endif
137
138 /*
139 * This is the main global constructor for the app. Call this before
140 * _any_ libcurl usage. If this fails, *NO* libcurl functions may be
141 * used, or havoc may be the result.
142 */
main_init(struct GlobalConfig * config)143 static CURLcode main_init(struct GlobalConfig *config)
144 {
145 CURLcode result = CURLE_OK;
146
147 #if defined(__DJGPP__) || defined(__GO32__)
148 /* stop stat() wasting time */
149 _djstat_flags |= _STAT_INODE | _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
150 #endif
151
152 /* Initialise the global config */
153 config->showerror = FALSE; /* show errors when silent */
154 config->styled_output = TRUE; /* enable detection */
155 config->parallel_max = PARALLEL_DEFAULT;
156
157 /* Allocate the initial operate config */
158 config->first = config->last = malloc(sizeof(struct OperationConfig));
159 if(config->first) {
160 /* Perform the libcurl initialization */
161 result = curl_global_init(CURL_GLOBAL_DEFAULT);
162 if(!result) {
163 /* Get information about libcurl */
164 result = get_libcurl_info();
165
166 if(!result) {
167 /* Initialise the config */
168 config_init(config->first);
169 config->first->global = config;
170 }
171 else {
172 errorf(config, "error retrieving curl library information");
173 free(config->first);
174 }
175 }
176 else {
177 errorf(config, "error initializing curl library");
178 free(config->first);
179 }
180 }
181 else {
182 errorf(config, "error initializing curl");
183 result = CURLE_FAILED_INIT;
184 }
185
186 return result;
187 }
188
free_globalconfig(struct GlobalConfig * config)189 static void free_globalconfig(struct GlobalConfig *config)
190 {
191 Curl_safefree(config->trace_dump);
192
193 if(config->trace_fopened && config->trace_stream)
194 fclose(config->trace_stream);
195 config->trace_stream = NULL;
196
197 Curl_safefree(config->libcurl);
198 }
199
200 /*
201 * This is the main global destructor for the app. Call this after
202 * _all_ libcurl usage is done.
203 */
main_free(struct GlobalConfig * config)204 static void main_free(struct GlobalConfig *config)
205 {
206 /* Cleanup the easy handle */
207 /* Main cleanup */
208 curl_global_cleanup();
209 free_globalconfig(config);
210
211 /* Free the config structures */
212 config_free(config->last);
213 config->first = NULL;
214 config->last = NULL;
215 }
216
217 /*
218 ** curl tool main function.
219 */
220 #ifdef _UNICODE
221 #if defined(__GNUC__)
222 /* GCC doesn't know about wmain() */
223 #pragma GCC diagnostic push
224 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
225 #pragma GCC diagnostic ignored "-Wmissing-declarations"
226 #endif
wmain(int argc,wchar_t * argv[])227 int wmain(int argc, wchar_t *argv[])
228 #else
229 int main(int argc, char *argv[])
230 #endif
231 {
232 CURLcode result = CURLE_OK;
233 struct GlobalConfig global;
234 memset(&global, 0, sizeof(global));
235
236 tool_init_stderr();
237
238 #ifdef _WIN32
239 /* Undocumented diagnostic option to list the full paths of all loaded
240 modules. This is purposely pre-init. */
241 if(argc == 2 && !_tcscmp(argv[1], _T("--dump-module-paths"))) {
242 struct curl_slist *item, *head = GetLoadedModulePaths();
243 for(item = head; item; item = item->next)
244 printf("%s\n", item->data);
245 curl_slist_free_all(head);
246 return head ? 0 : 1;
247 }
248 /* win32_init must be called before other init routines. */
249 result = win32_init();
250 if(result) {
251 errorf(&global, "(%d) Windows-specific init failed", result);
252 return result;
253 }
254 #endif
255
256 if(main_checkfds()) {
257 errorf(&global, "out of file descriptors");
258 return CURLE_FAILED_INIT;
259 }
260
261 #if defined(HAVE_SIGNAL) && defined(SIGPIPE)
262 (void)signal(SIGPIPE, SIG_IGN);
263 #endif
264
265 /* Initialize memory tracking */
266 memory_tracking_init();
267
268 /* Initialize the curl library - do not call any libcurl functions before
269 this point */
270 result = main_init(&global);
271 if(!result) {
272 /* Start our curl operation */
273 result = operate(&global, argc, argv);
274
275 /* Perform the main cleanup */
276 main_free(&global);
277 }
278
279 #ifdef _WIN32
280 /* Flush buffers of all streams opened in write or update mode */
281 fflush(NULL);
282 #endif
283
284 #ifdef __VMS
285 vms_special_exit(result, vms_show);
286 #else
287 return (int)result;
288 #endif
289 }
290
291 #ifdef _UNICODE
292 #ifdef __GNUC__
293 #pragma GCC diagnostic pop
294 #endif
295 #endif
296
297 #endif /* ndef UNITTESTS */
298
