1 /*
2 * Copyright (C) 2006 Dan Carpenter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 *
17 * Copyright 2019 Joyent, Inc.
18 */
19
20 #include <stdio.h>
21 #include <unistd.h>
22 #include <libgen.h>
23 #include "smatch.h"
24 #include "check_list.h"
25
26 char *option_debug_check = (char *)"";
27 char *option_project_str = (char *)"smatch_generic";
28 static char *option_db_file = (char *)"smatch_db.sqlite";
29 enum project_type option_project = PROJ_NONE;
30 char *bin_dir;
31 char *data_dir;
32 int option_no_data = 0;
33 int option_spammy = 0;
34 int option_info = 0;
35 int option_full_path = 0;
36 int option_param_mapper = 0;
37 int option_call_tree = 0;
38 int option_no_db = 0;
39 int option_enable = 0;
40 int option_disable = 0;
41 int option_debug_related;
42 int option_file_output;
43 int option_time;
44 int option_mem;
45 char *option_datadir_str;
46 int option_fatal_checks;
47 int option_succeed;
48 int option_timeout = 60;
49
50 FILE *sm_outfd;
51 FILE *sql_outfd;
52 FILE *caller_info_fd;
53
54 int sm_nr_errors;
55 int sm_nr_checks;
56
57 bool __silence_warnings_for_stmt;
58
59 const char *progname;
60
61 typedef void (*reg_func) (int id);
62 #define CK(_x) {.name = #_x, .func = &_x, .enabled = 0},
63 static struct reg_func_info {
64 const char *name;
65 reg_func func;
66 int enabled;
67 } reg_funcs[] = {
68 {NULL, NULL},
69 #include "check_list.h"
70 };
71 #undef CK
72 int num_checks = ARRAY_SIZE(reg_funcs) - 1;
73
74 const char *check_name(unsigned short id)
75 {
76 if (id >= ARRAY_SIZE(reg_funcs))
77 return "internal";
78
79 return reg_funcs[id].name;
80 }
81
82 int id_from_name(const char *name)
83 {
84 int i;
85
86 for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
87 if (!strcmp(name, reg_funcs[i].name))
88 return i;
89 }
90 return 0;
91 }
92
93 static void show_checks(void)
94 {
95 int i;
96
97 for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
98 if (!strncmp(reg_funcs[i].name, "check_", 6))
99 printf("%3d. %s\n", i, reg_funcs[i].name);
100 }
101 exit(0);
102 }
103
104 static void enable_disable_checks(char *s, bool enable)
105 {
106 char buf[128];
107 char *next;
108 int i;
109
110 do {
111 next = strchr(s, ',');
112 if (next) {
113 *next = '\0';
114 next++;
115 }
116 if (*s == '\0')
117 return;
118 if (strncmp(s, "check_", 6) == 0)
119 snprintf(buf, sizeof(buf), "%s", s);
120 else
121 snprintf(buf, sizeof(buf), "check_%s", s);
122
123
124 for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
125 if (strcmp(reg_funcs[i].name, buf) == 0) {
126 reg_funcs[i].enabled = (enable == true) ? 1 : -1;
127 break;
128 }
129 }
130
131 if (i == ARRAY_SIZE(reg_funcs))
132 sm_fatal("'%s' not found", s);
133
134 } while ((s = next));
135 }
136
137 static void help(void)
138 {
139 printf("Usage: smatch [smatch arguments][sparse arguments] file.c\n");
140 printf("--project=<name> or -p=<name>: project specific tests\n");
141 printf("--succeed: don't exit with an error\n");
142 printf("--spammy: print superfluous crap.\n");
143 printf("--info: print info used to fill smatch_data/.\n");
144 printf("--debug: print lots of debug output.\n");
145 printf("--param-mapper: enable param_mapper output.\n");
146 printf("--no-data: do not use the /smatch_data/ directory.\n");
147 printf("--data=<dir>: overwrite path to default smatch data directory.\n");
148 printf("--full-path: print the full pathname.\n");
149 printf("--debug-implied: print debug output about implications.\n");
150 printf("--assume-loops: assume loops always go through at least once.\n");
151 printf("--two-passes: use a two pass system for each function.\n");
152 printf("--file-output: instead of printing stdout, print to \"file.c.smatch_out\".\n");
153 printf("--fatal-checks: check output is treated as an error.\n");
154 printf("--help: print this helpful message.\n");
155 exit(1);
156 }
157
158 static int match_option(const char *arg, const char *option)
159 {
160 char *str;
161 char *tmp;
162 int ret = 0;
163
164 str = malloc(strlen(option) + 3);
165 snprintf(str, strlen(option) + 3, "--%s", option);
166 tmp = str;
167 while (*tmp) {
168 if (*tmp == '_')
169 *tmp = '-';
170 tmp++;
171 }
172 if (!strcmp(arg, str))
173 ret = 1;
174 free(str);
175 return ret;
176 }
177
178 #define OPTION(_x) do { \
179 if (match_option((*argvp)[i], #_x)) { \
180 option_##_x = 1; \
181 } \
182 } while (0)
183
184 void parse_args(int *argcp, char ***argvp)
185 {
186 int i;
187
188 for (i = 1 ; i < *argcp; i++) {
189 if (!strcmp((*argvp)[i], "--help"))
190 help();
191
192 if (!strcmp((*argvp)[i], "--show-checks"))
193 show_checks();
194
195 if (!strncmp((*argvp)[i], "--project=", 10))
196 option_project_str = (*argvp)[i] + 10;
197
198 if (!strncmp((*argvp)[i], "-p=", 3))
199 option_project_str = (*argvp)[i] + 3;
200
201 if (!strncmp((*argvp)[i], "--db-file=", 10))
202 option_db_file = (*argvp)[i] + 10;
203
204 if (!strncmp((*argvp)[i], "--data=", 7))
205 option_datadir_str = (*argvp)[i] + 7;
206
207 if (!strncmp((*argvp)[i], "--debug=", 8))
208 option_debug_check = (*argvp)[i] + 8;
209
210 if (strncmp((*argvp)[i], "--trace=", 8) == 0)
211 trace_variable = (*argvp)[i] + 8;
212
213 if (strncmp((*argvp)[i], "--enable=", 9) == 0) {
214 enable_disable_checks((*argvp)[i] + 9, 1);
215 option_enable = 1;
216 }
217
218 if (strncmp((*argvp)[i], "--disable=", 10) == 0) {
219 enable_disable_checks((*argvp)[i] + 10, 0);
220 option_enable = 1;
221 option_disable = 1;
222 }
223
224 if (!strncmp((*argvp)[i], "--timeout=", 10)) {
225 if (sscanf((*argvp)[i] + 10, "%d",
226 &option_timeout) != 1)
227 sm_fatal("invalid option %s", (*argvp)[i]);
228 }
229
230 OPTION(fatal_checks);
231 OPTION(spammy);
232 OPTION(info);
233 OPTION(debug);
234 OPTION(debug_implied);
235 OPTION(debug_related);
236 OPTION(assume_loops);
237 OPTION(no_data);
238 OPTION(two_passes);
239 OPTION(full_path);
240 OPTION(param_mapper);
241 OPTION(call_tree);
242 OPTION(file_output);
243 OPTION(time);
244 OPTION(mem);
245 OPTION(no_db);
246 OPTION(succeed);
247 }
248
249 if (strcmp(option_project_str, "smatch_generic") != 0)
250 option_project = PROJ_UNKNOWN;
251
252 if (strcmp(option_project_str, "kernel") == 0)
253 option_project = PROJ_KERNEL;
254 else if (strcmp(option_project_str, "wine") == 0)
255 option_project = PROJ_WINE;
256 else if (strcmp(option_project_str, "illumos_kernel") == 0)
257 option_project = PROJ_ILLUMOS_KERNEL;
258 else if (strcmp(option_project_str, "illumos_user") == 0)
259 option_project = PROJ_ILLUMOS_USER;
260 }
261
262 static char *read_bin_filename(void)
263 {
264 char filename[PATH_MAX] = {};
265 char proc[PATH_MAX];
266
267 pid_t pid = getpid();
268 sprintf(proc, "/proc/%d/exe", pid);
269 if (readlink(proc, filename, PATH_MAX) < 0)
270 return NULL;
271 return alloc_string(filename);
272 }
273
274 static char *get_bin_dir(char *arg0)
275 {
276 char *orig;
277
278 orig = read_bin_filename();
279 if (!orig)
280 orig = alloc_string(arg0);
281 return dirname(orig);
282 }
283
284 static char *get_data_dir(char *arg0)
285 {
286 char buf[256];
287 char *dir;
288
289 if (option_no_data)
290 return NULL;
291
292 if (option_datadir_str) {
293 if (access(option_datadir_str, R_OK))
294 sm_warning("%s is not accessible -- ignored.",
295 option_datadir_str);
296 else
297 return alloc_string(option_datadir_str);
298 }
299
300 strncpy(buf, "smatch_data/", sizeof(buf));
301 dir = alloc_string(buf);
302 if (!access(dir, R_OK))
303 return dir;
304
305 strncpy(buf, bin_dir, 254);
306
307 buf[255] = '\0';
308 strncat(buf, "/smatch_data/", 254 - strlen(buf));
309 dir = alloc_string(buf);
310 if (!access(dir, R_OK))
311 return dir;
312 free_string(dir);
313 snprintf(buf, 254, "%s/smatch_data/", SMATCHDATADIR);
314 dir = alloc_string(buf);
315 if (!access(dir, R_OK))
316 return dir;
317
318 sm_warning("%s is not accessible.", dir);
319 sm_warning("Use --no-data or --data to suppress this message.");
320 return NULL;
321 }
322
323 int main(int argc, char **argv)
324 {
325 int i;
326 reg_func func;
327
328 sm_outfd = stdout;
329 sql_outfd = stdout;
330 caller_info_fd = stdout;
331
332 progname = argv[0];
333
334 parse_args(&argc, &argv);
335
336 if (argc < 2)
337 help();
338
339 /* this gets set back to zero when we parse the first function */
340 final_pass = 1;
341
342 bin_dir = get_bin_dir(argv[0]);
343 data_dir = get_data_dir(argv[0]);
344
345 allocate_hook_memory();
346 create_function_hook_hash();
347 open_smatch_db(option_db_file);
348 for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
349 func = reg_funcs[i].func;
350 /* The script IDs start at 1.
351 0 is used for internal stuff. */
352 if (!option_enable || reg_funcs[i].enabled == 1 ||
353 (option_disable && reg_funcs[i].enabled != -1) ||
354 strncmp(reg_funcs[i].name, "register_", 9) == 0)
355 func(i);
356 }
357
358 smatch(argc, argv);
359 free_string(data_dir);
360
361 if (option_succeed)
362 return 0;
363 if (sm_nr_errors > 0)
364 return 1;
365 if (sm_nr_checks > 0 && option_fatal_checks)
366 return 1;
367 return 0;
368 }