xref: /illumos-gate/usr/src/tools/smatch/src/smatch.c (revision 6523a3aa7f325d64841382707603be7a86e68147)
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 "smatch_slist.h"
25 #include "check_list.h"
26 
27 char *option_debug_check = (char *)"";
28 char *option_project_str = (char *)"smatch_generic";
29 static char *option_db_file = (char *)"smatch_db.sqlite";
30 enum project_type option_project = PROJ_NONE;
31 char *bin_dir;
32 char *data_dir;
33 int option_no_data = 0;
34 int option_spammy = 0;
35 int option_info = 0;
36 int option_full_path = 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_file_output;
42 int option_time;
43 int option_mem;
44 char *option_datadir_str;
45 int option_fatal_checks;
46 int option_succeed;
47 int option_timeout = 60;
48 
49 FILE *sm_outfd;
50 FILE *sql_outfd;
51 FILE *caller_info_fd;
52 
53 int sm_nr_errors;
54 int sm_nr_checks;
55 
56 bool __silence_warnings_for_stmt;
57 
58 const char *progname;
59 
60 typedef void (*reg_func) (int id);
61 #define CK(_x) {.name = #_x, .func = &_x, .enabled = 0},
62 static struct reg_func_info {
63 	const char *name;
64 	reg_func func;
65 	int enabled;
66 } reg_funcs[] = {
67 	{NULL, NULL},
68 #include "check_list.h"
69 };
70 #undef CK
71 int num_checks = ARRAY_SIZE(reg_funcs) - 1;
72 
check_name(unsigned short id)73 const char *check_name(unsigned short id)
74 {
75 	if (id >= ARRAY_SIZE(reg_funcs))
76 		return "internal";
77 
78 	return reg_funcs[id].name;
79 }
80 
id_from_name(const char * name)81 int id_from_name(const char *name)
82 {
83 	int i;
84 
85 	for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
86 		if (!strcmp(name, reg_funcs[i].name))
87 			return i;
88 	}
89 	return 0;
90 }
91 
show_checks(void)92 static void show_checks(void)
93 {
94 	int i;
95 
96 	for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
97 		if (!strncmp(reg_funcs[i].name, "check_", 6))
98 			printf("%3d. %s\n", i, reg_funcs[i].name);
99 	}
100 	exit(0);
101 }
102 
enable_disable_checks(char * s,bool enable)103 static void enable_disable_checks(char *s, bool enable)
104 {
105 	char buf[128];
106 	char *next;
107 	int i;
108 
109 	do {
110 		next = strchr(s, ',');
111 		if (next) {
112 			*next = '\0';
113 			next++;
114 		}
115 		if (*s == '\0')
116 			return;
117 		if (strncmp(s, "check_", 6) == 0)
118 			snprintf(buf, sizeof(buf), "%s", s);
119 		else
120 			snprintf(buf, sizeof(buf), "check_%s", s);
121 
122 
123 		for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
124 			if (strcmp(reg_funcs[i].name, buf) == 0) {
125 				reg_funcs[i].enabled = (enable == true) ? 1 : -1;
126 				break;
127 			}
128 		}
129 
130 		if (i == ARRAY_SIZE(reg_funcs))
131 			sm_fatal("'%s' not found", s);
132 
133 	} while ((s = next));
134 }
135 
help(void)136 static void help(void)
137 {
138 	printf("Usage:  smatch [smatch arguments][sparse arguments] file.c\n");
139 	printf("--project=<name> or -p=<name>: project specific tests\n");
140 	printf("--succeed: don't exit with an error\n");
141 	printf("--spammy:  print superfluous crap.\n");
142 	printf("--info:  print info used to fill smatch_data/.\n");
143 	printf("--debug:  print lots of debug output.\n");
144 	printf("--no-data:  do not use the /smatch_data/ directory.\n");
145 	printf("--data=<dir>: overwrite path to default smatch data directory.\n");
146 	printf("--full-path:  print the full pathname.\n");
147 	printf("--debug-implied:  print debug output about implications.\n");
148 	printf("--assume-loops:  assume loops always go through at least once.\n");
149 	printf("--two-passes:  use a two pass system for each function.\n");
150 	printf("--file-output:  instead of printing stdout, print to \"file.c.smatch_out\".\n");
151 	printf("--fatal-checks: check output is treated as an error.\n");
152 	printf("--help:  print this helpful message.\n");
153 	exit(1);
154 }
155 
match_option(const char * arg,const char * option)156 static int match_option(const char *arg, const char *option)
157 {
158 	char *str;
159 	char *tmp;
160 	int ret = 0;
161 
162 	str = malloc(strlen(option) + 3);
163 	snprintf(str, strlen(option) + 3, "--%s", option);
164 	tmp = str;
165 	while (*tmp) {
166 		if (*tmp == '_')
167 			*tmp = '-';
168 		tmp++;
169 	}
170 	if (!strcmp(arg, str))
171 		ret = 1;
172 	free(str);
173 	return ret;
174 }
175 
176 #define OPTION(_x) do {					\
177 	if (match_option((*argvp)[i], #_x)) { 		\
178 		option_##_x = 1;			\
179 	}                                               \
180 } while (0)
181 
parse_args(int * argcp,char *** argvp)182 void parse_args(int *argcp, char ***argvp)
183 {
184 	int i;
185 
186 	for (i = 1 ; i < *argcp; i++) {
187 		if (!strcmp((*argvp)[i], "--help"))
188 			help();
189 
190 		if (!strcmp((*argvp)[i], "--show-checks"))
191 			show_checks();
192 
193 		if (!strncmp((*argvp)[i], "--project=", 10))
194 			option_project_str = (*argvp)[i] + 10;
195 
196 		if (!strncmp((*argvp)[i], "-p=", 3))
197 			option_project_str = (*argvp)[i] + 3;
198 
199 		if (!strncmp((*argvp)[i], "--db-file=", 10))
200 			option_db_file = (*argvp)[i] + 10;
201 
202 		if (!strncmp((*argvp)[i], "--data=", 7))
203 			option_datadir_str = (*argvp)[i] + 7;
204 
205 		if (!strncmp((*argvp)[i], "--debug=", 8))
206 			option_debug_check = (*argvp)[i] + 8;
207 
208 		if (strncmp((*argvp)[i], "--trace=", 8) == 0)
209 			trace_variable = (*argvp)[i] + 8;
210 
211 		if (strncmp((*argvp)[i], "--enable=", 9) == 0) {
212 			enable_disable_checks((*argvp)[i] + 9, 1);
213 			option_enable = 1;
214 		}
215 
216 		if (strncmp((*argvp)[i], "--disable=", 10) == 0) {
217 			enable_disable_checks((*argvp)[i] + 10, 0);
218 			option_enable = 1;
219 			option_disable = 1;
220 		}
221 
222 		if (!strncmp((*argvp)[i], "--timeout=", 10)) {
223 			if (sscanf((*argvp)[i] + 10, "%d",
224 			    &option_timeout) != 1)
225 				sm_fatal("invalid option %s", (*argvp)[i]);
226 		}
227 
228 		OPTION(fatal_checks);
229 		OPTION(spammy);
230 		OPTION(info);
231 		OPTION(debug);
232 		OPTION(assume_loops);
233 		OPTION(no_data);
234 		OPTION(two_passes);
235 		OPTION(full_path);
236 		OPTION(call_tree);
237 		OPTION(file_output);
238 		OPTION(time);
239 		OPTION(mem);
240 		OPTION(no_db);
241 		OPTION(succeed);
242 	}
243 
244 	if (strcmp(option_project_str, "smatch_generic") != 0)
245 		option_project = PROJ_UNKNOWN;
246 
247 	if (strcmp(option_project_str, "kernel") == 0)
248 		option_project = PROJ_KERNEL;
249 	else if (strcmp(option_project_str, "wine") == 0)
250 		option_project = PROJ_WINE;
251 	else if (strcmp(option_project_str, "illumos_kernel") == 0)
252 		option_project = PROJ_ILLUMOS_KERNEL;
253 	else if (strcmp(option_project_str, "illumos_user") == 0)
254 		option_project = PROJ_ILLUMOS_USER;
255 }
256 
read_bin_filename(void)257 static char *read_bin_filename(void)
258 {
259 	char filename[PATH_MAX] = {};
260 	char proc[PATH_MAX];
261 
262 	pid_t pid = getpid();
263 	sprintf(proc, "/proc/%d/exe", pid);
264 	if (readlink(proc, filename, PATH_MAX) < 0)
265 		return NULL;
266 	return alloc_string(filename);
267 }
268 
get_bin_dir(char * arg0)269 static char *get_bin_dir(char *arg0)
270 {
271 	char *orig;
272 
273 	orig = read_bin_filename();
274 	if (!orig)
275 		orig = alloc_string(arg0);
276 	return dirname(orig);
277 }
278 
get_data_dir(char * arg0)279 static char *get_data_dir(char *arg0)
280 {
281 	char buf[256];
282 	char *dir;
283 
284 	if (option_no_data)
285 		return NULL;
286 
287 	if (option_datadir_str) {
288 		if (access(option_datadir_str, R_OK))
289 			sm_warning("%s is not accessible -- ignored.",
290 					option_datadir_str);
291 		else
292 			return alloc_string(option_datadir_str);
293 	}
294 
295 	strncpy(buf, "smatch_data/", sizeof(buf));
296 	dir = alloc_string(buf);
297 	if (!access(dir, R_OK))
298 		return dir;
299 
300 	strncpy(buf, bin_dir, 254);
301 
302 	buf[255] = '\0';
303 	strncat(buf, "/smatch_data/", 254 - strlen(buf));
304 	dir = alloc_string(buf);
305 	if (!access(dir, R_OK))
306 		return dir;
307 	free_string(dir);
308 	snprintf(buf, 254, "%s/smatch_data/", SMATCHDATADIR);
309 	dir = alloc_string(buf);
310 	if (!access(dir, R_OK))
311 		return dir;
312 
313 	sm_warning("%s is not accessible.", dir);
314 	sm_warning("Use --no-data or --data to suppress this message.");
315 	return NULL;
316 }
317 
main(int argc,char ** argv)318 int main(int argc, char **argv)
319 {
320 	struct string_list *filelist = NULL;
321 	int i;
322 	reg_func func;
323 
324 	sm_outfd = stdout;
325 	sql_outfd = stdout;
326 	caller_info_fd = stdout;
327 
328 	progname = argv[0];
329 
330 	parse_args(&argc, &argv);
331 
332 	if (argc < 2)
333 		help();
334 
335 	/* this gets set back to zero when we parse the first function */
336 	final_pass = 1;
337 
338 	bin_dir = get_bin_dir(argv[0]);
339 	data_dir = get_data_dir(argv[0]);
340 
341 	allocate_hook_memory();
342 	allocate_dynamic_states_array(num_checks);
343 	allocate_tracker_array(num_checks);
344 	create_function_hook_hash();
345 	open_smatch_db(option_db_file);
346 	sparse_initialize(argc, argv, &filelist);
347 	alloc_valid_ptr_rl();
348 
349 	for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
350 		func = reg_funcs[i].func;
351 		/* The script IDs start at 1.
352 		   0 is used for internal stuff. */
353 		if (!option_enable || reg_funcs[i].enabled == 1 ||
354 		    (option_disable && reg_funcs[i].enabled != -1) ||
355 		    strncmp(reg_funcs[i].name, "register_", 9) == 0)
356 			func(i);
357 	}
358 
359 	smatch(filelist);
360 	free_string(data_dir);
361 
362 	if (option_succeed)
363 		return 0;
364 	if (sm_nr_errors > 0)
365 		return 1;
366 	if (sm_nr_checks > 0 && option_fatal_checks)
367 		return 1;
368 	return 0;
369 }
370