clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name w.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.bin/w/obj -resource-dir /usr/local/lib/clang/13.0.0 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.bin/w/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/usr.bin/w/w.c
1 | |
2 | |
3 | |
4 | |
5 | |
6 | |
7 | |
8 | |
9 | |
10 | |
11 | |
12 | |
13 | |
14 | |
15 | |
16 | |
17 | |
18 | |
19 | |
20 | |
21 | |
22 | |
23 | |
24 | |
25 | |
26 | |
27 | |
28 | |
29 | |
30 | |
31 | |
32 | |
33 | |
34 | |
35 | |
36 | |
37 | |
38 | #include <sys/param.h> /* MAXCOMLEN */ |
39 | #include <sys/time.h> |
40 | #include <sys/stat.h> |
41 | #include <sys/sysctl.h> |
42 | #include <sys/signal.h> |
43 | #include <sys/proc.h> |
44 | #include <sys/ioctl.h> |
45 | #include <sys/socket.h> |
46 | #include <sys/tty.h> |
47 | |
48 | #include <netinet/in.h> |
49 | #include <arpa/inet.h> |
50 | |
51 | #include <ctype.h> |
52 | #include <err.h> |
53 | #include <errno.h> |
54 | #include <fcntl.h> |
55 | #include <kvm.h> |
56 | #include <netdb.h> |
57 | #include <nlist.h> |
58 | #include <paths.h> |
59 | #include <stdio.h> |
60 | #include <stdlib.h> |
61 | #include <string.h> |
62 | #include <unistd.h> |
63 | #include <limits.h> |
64 | #include <utmp.h> |
65 | #include <vis.h> |
66 | |
67 | #include "extern.h" |
68 | |
69 | struct utmp utmp; |
70 | struct winsize ws; |
71 | kvm_t *kd; |
72 | time_t now; |
73 | int ttywidth; |
74 | int argwidth; |
75 | int header = 1; |
76 | int nflag = 1; |
77 | int sortidle; |
78 | char *sel_user; |
79 | char domain[HOST_NAME_MAX+1]; |
80 | |
81 | #define NAME_WIDTH 8 |
82 | #define HOST_WIDTH 16 |
83 | |
84 | |
85 | |
86 | |
87 | struct entry { |
88 | struct entry *next; |
89 | struct utmp utmp; |
90 | dev_t tdev; |
91 | time_t idle; |
92 | struct kinfo_proc *kp; |
93 | } *ep, *ehead = NULL, **nextp = &ehead; |
94 | |
95 | static void fmt_putc(int, int *); |
96 | static void fmt_puts(const char *, int *); |
97 | static void pr_args(struct kinfo_proc *); |
98 | static void pr_header(time_t *, int); |
99 | static struct stat |
100 | *ttystat(char *); |
101 | static void usage(int); |
102 | |
103 | int |
104 | main(int argc, char *argv[]) |
105 | { |
106 | extern char *__progname; |
107 | struct kinfo_proc *kp; |
108 | struct hostent *hp; |
109 | struct stat *stp; |
110 | FILE *ut; |
111 | struct in_addr addr; |
112 | int ch, i, nentries, nusers, wcmd; |
113 | char *memf, *nlistf, *p, *x; |
114 | char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX]; |
115 | |
116 | |
117 | p = __progname; |
118 | if (*p == '-') |
| 1 | Assuming the condition is false | |
|
| |
119 | p++; |
120 | if (p[0] == 'w' && p[1] == '\0') { |
| 3 | | Assuming the condition is true | |
|
| 4 | | Assuming the condition is true | |
|
| |
121 | wcmd = 1; |
122 | p = "hiflM:N:asuw"; |
123 | } else if (!strcmp(p, "uptime")) { |
124 | wcmd = 0; |
125 | p = ""; |
126 | } else |
127 | errx(1, |
128 | "this program should be invoked only as \"w\" or \"uptime\""); |
129 | |
130 | memf = nlistf = NULL; |
131 | while ((ch = getopt(argc, argv, p)) != -1) |
| 6 | | Assuming the condition is false | |
|
| 7 | | Loop condition is false. Execution continues on line 156 | |
|
132 | switch (ch) { |
133 | case 'h': |
134 | header = 0; |
135 | break; |
136 | case 'i': |
137 | sortidle = 1; |
138 | break; |
139 | case 'M': |
140 | header = 0; |
141 | memf = optarg; |
142 | break; |
143 | case 'N': |
144 | nlistf = optarg; |
145 | break; |
146 | case 'a': |
147 | nflag = 0; |
148 | break; |
149 | case 'f': case 'l': case 's': case 'u': case 'w': |
150 | warnx("[-flsuw] no longer supported"); |
151 | |
152 | case '?': |
153 | default: |
154 | usage(wcmd); |
155 | } |
156 | argc -= optind; |
157 | argv += optind; |
158 | |
159 | if (nflag == 0) { |
| |
160 | if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1) |
161 | err(1, "pledge"); |
162 | } else { |
163 | if (pledge("stdio tty rpath ps vminfo", NULL) == -1) |
| 9 | | Assuming the condition is false | |
|
| |
164 | err(1, "pledge"); |
165 | } |
166 | |
167 | if (nlistf == NULL && memf == NULL) { |
| |
168 | if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, |
| 12 | | Assuming the condition is false | |
|
| |
169 | errbuf)) == NULL) |
170 | errx(1, "%s", errbuf); |
171 | } else { |
172 | if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) |
173 | errx(1, "%s", errbuf); |
174 | } |
175 | |
176 | (void)time(&now); |
177 | if ((ut = fopen(_PATH_UTMP, "r")) == NULL) |
| 14 | | Assuming the condition is false | |
|
| |
178 | err(1, "%s", _PATH_UTMP); |
179 | |
180 | if (*argv) |
| 16 | | Assuming the condition is false | |
|
| |
181 | sel_user = *argv; |
182 | |
183 | for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { |
| 18 | | Loop condition is true. Entering loop body | |
|
| 30 | | Loop condition is false. Execution continues on line 216 | |
|
184 | if (utmp.ut_name[0] == '\0') |
| 19 | | Assuming the condition is false | |
|
| |
185 | continue; |
186 | ++nusers; |
187 | if (wcmd == 0 || (sel_user && |
| 21 | | Assuming 'sel_user' is null | |
|
188 | strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) |
189 | continue; |
190 | if ((ep = calloc(1, sizeof(*ep))) == NULL) |
| 22 | | Assuming the condition is false | |
|
| |
191 | err(1, NULL); |
192 | *nextp = ep; |
193 | nextp = &(ep->next); |
194 | memcpy(&(ep->utmp), &utmp, sizeof(utmp)); |
195 | if (!(stp = ttystat(ep->utmp.ut_line))) |
| 24 | | Assuming 'stp' is non-null | |
|
| |
196 | continue; |
197 | ep->tdev = stp->st_rdev; |
198 | |
199 | |
200 | |
201 | |
202 | |
203 | if (ep->tdev == 0) { |
| 26 | | Assuming field 'tdev' is not equal to 0 | |
|
| |
204 | int mib[2]; |
205 | size_t size; |
206 | |
207 | mib[0] = CTL_KERN; |
208 | mib[1] = KERN_CONSDEV; |
209 | size = sizeof(dev_t); |
210 | (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); |
211 | } |
212 | |
213 | if ((ep->idle = now - stp->st_atime) < 0) |
| 28 | | Assuming the condition is false | |
|
| |
214 | ep->idle = 0; |
215 | } |
216 | (void)fclose(ut); |
217 | |
218 | if (header || wcmd == 0) { |
| |
| |
219 | pr_header(&now, nusers); |
220 | if (wcmd == 0) |
221 | exit (0); |
222 | } |
223 | |
224 | #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" |
225 | #define WUSED (sizeof(HEADER) - sizeof("WHAT")) |
226 | if (header) |
| |
227 | (void)puts(HEADER); |
228 | |
229 | kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); |
230 | if (kp == NULL) |
| 34 | | Assuming 'kp' is not equal to NULL | |
|
| |
231 | errx(1, "%s", kvm_geterr(kd)); |
232 | |
233 | if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && |
| 36 | | Assuming the condition is false | |
|
| |
234 | ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && |
235 | ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) |
| 37 | | Assuming field 'ws_col' is not equal to 0 | |
|
236 | ttywidth = 79; |
237 | else |
238 | ttywidth = ws.ws_col - 1; |
239 | argwidth = ttywidth - WUSED; |
240 | if (argwidth < 4) |
| 39 | | Assuming 'argwidth' is >= 4 | |
|
| |
241 | argwidth = 8; |
242 | |
243 | for (i = 0; i < nentries; i++, kp++) { |
| 41 | | Assuming 'i' is >= 'nentries' | |
|
| 42 | | Loop condition is false. Execution continues on line 272 | |
|
244 | if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE)) |
245 | continue; |
246 | for (ep = ehead; ep != NULL; ep = ep->next) { |
247 | |
248 | if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { |
249 | char pidstr[UT_LINESIZE-2]; |
250 | pid_t fp; |
251 | |
252 | (void)strncpy(pidstr, &ep->utmp.ut_line[3], |
253 | sizeof(pidstr) - 1); |
254 | pidstr[sizeof(pidstr) - 1] = '\0'; |
255 | fp = (pid_t)strtol(pidstr, NULL, 10); |
256 | if (kp->p_pid == fp) { |
257 | ep->kp = kp; |
258 | break; |
259 | } |
260 | } else if (ep->tdev == kp->p_tdev && |
261 | kp->p__pgid == kp->p_tpgid) { |
262 | |
263 | |
264 | |
265 | if (proc_compare(ep->kp, kp)) |
266 | ep->kp = kp; |
267 | break; |
268 | } |
269 | } |
270 | } |
271 | |
272 | if (sortidle && ehead != NULL) { |
| 43 | | Assuming 'sortidle' is 0 | |
|
273 | struct entry *from = ehead, *save; |
274 | |
275 | ehead = NULL; |
276 | while (from != NULL) { |
277 | for (nextp = &ehead; |
278 | (*nextp) && from->idle >= (*nextp)->idle; |
279 | nextp = &(*nextp)->next) |
280 | continue; |
281 | save = from; |
282 | from = from->next; |
283 | save->next = *nextp; |
284 | *nextp = save; |
285 | } |
286 | } |
287 | |
288 | if (!nflag) { |
| 44 | | Assuming 'nflag' is not equal to 0 | |
|
| |
289 | if (gethostname(domain, sizeof(domain)) == -1 || |
290 | (p = strchr(domain, '.')) == 0) |
291 | domain[0] = '\0'; |
292 | else { |
293 | domain[sizeof(domain) - 1] = '\0'; |
294 | memmove(domain, p, strlen(p) + 1); |
295 | } |
296 | } |
297 | |
298 | for (ep = ehead; ep != NULL; ep = ep->next) { |
| 46 | | Assuming 'ep' is not equal to NULL | |
|
| 47 | | Loop condition is true. Entering loop body | |
|
299 | p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; |
| 48 | | Assuming the condition is false | |
|
| |
300 | for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) |
| 50 | | Loop condition is true. Entering loop body | |
|
301 | if (p[i] == ':') { |
| |
302 | x = &p[i]; |
303 | *x++ = '\0'; |
304 | break; |
305 | } |
306 | if (!nflag && inet_aton(p, &addr) && |
307 | (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { |
308 | if (domain[0] != '\0') { |
309 | p = hp->h_name; |
310 | p += strlen(hp->h_name); |
311 | p -= strlen(domain); |
312 | if (p > hp->h_name && |
313 | strcasecmp(p, domain) == 0) |
314 | *p = '\0'; |
315 | } |
316 | p = hp->h_name; |
317 | } |
318 | if (x) { |
| |
319 | (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, |
320 | (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); |
321 | p = buf; |
322 | } |
323 | (void)printf("%-*.*s %-2.2s %-*.*s ", |
324 | NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, |
325 | strncmp(ep->utmp.ut_line, "tty", 3) ? |
| 53 | | Assuming the condition is false | |
|
| |
326 | ep->utmp.ut_line : ep->utmp.ut_line + 3, |
327 | HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); |
| |
328 | pr_attime(&ep->utmp.ut_time, &now); |
329 | pr_idle(ep->idle); |
330 | pr_args(ep->kp); |
| |
331 | printf("\n"); |
332 | } |
333 | exit(0); |
334 | } |
335 | |
336 | static void |
337 | fmt_putc(int c, int *leftp) |
338 | { |
339 | |
340 | if (*leftp == 0) |
341 | return; |
342 | if (*leftp != -1) |
343 | *leftp -= 1; |
344 | putchar(c); |
345 | } |
346 | |
347 | static void |
348 | fmt_puts(const char *s, int *leftp) |
349 | { |
350 | static char *v = NULL; |
| 68 | | 'v' initialized to a null pointer value | |
|
351 | static size_t maxlen = 0; |
352 | size_t len; |
353 | |
354 | if (*leftp == 0) |
| 69 | | Assuming the condition is false | |
|
| |
355 | return; |
356 | len = strlen(s) * 4 + 1; |
357 | if (len > maxlen) { |
| 71 | | Assuming 'len' is <= 'maxlen' | |
|
| |
358 | free(v); |
359 | maxlen = 0; |
360 | if (len < getpagesize()) |
361 | len = getpagesize(); |
362 | v = malloc(len); |
363 | if (v == NULL) |
364 | return; |
365 | maxlen = len; |
366 | } |
367 | strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE); |
368 | if (*leftp != -1) { |
| 73 | | Assuming the condition is true | |
|
| |
369 | len = strlen(v); |
| 75 | | Null pointer passed as 1st argument to string length function |
|
370 | if (len > *leftp) { |
371 | v[*leftp] = '\0'; |
372 | *leftp = 0; |
373 | } else |
374 | *leftp -= len; |
375 | } |
376 | printf("%s", v); |
377 | } |
378 | |
379 | |
380 | static void |
381 | pr_args(struct kinfo_proc *kp) |
382 | { |
383 | char **argv, *str; |
384 | int left; |
385 | |
386 | if (kp == NULL) |
| 57 | | Assuming 'kp' is not equal to NULL | |
|
| |
387 | goto nothing; |
388 | left = argwidth; |
389 | argv = kvm_getargv(kd, kp, argwidth+60); |
390 | if (argv == NULL) |
| 59 | | Assuming 'argv' is not equal to NULL | |
|
| |
391 | goto nothing; |
392 | |
393 | if (*argv == NULL || **argv == '\0') { |
| 61 | | Assuming the condition is false | |
|
| 62 | | Assuming the condition is false | |
|
| |
394 | |
395 | fmt_putc('(', &left); |
396 | fmt_puts(kp->p_comm, &left); |
397 | fmt_putc(')', &left); |
398 | } |
399 | while (*argv) { |
| 64 | | Loop condition is true. Entering loop body | |
|
400 | |
401 | |
402 | |
403 | |
404 | if (strncmp(*argv, "ftpd:", 5) == 0) { |
| 65 | | Assuming the condition is false | |
|
| |
405 | if ((str = strchr(*argv + 5, ':')) != NULL) |
406 | str = strchr(str + 1, ':'); |
407 | if (str != NULL) { |
408 | if ((str[0] == ':') && |
409 | isspace((unsigned char)str[1])) |
410 | str += 2; |
411 | fmt_puts(str, &left); |
412 | } else |
413 | fmt_puts(*argv, &left); |
414 | } else |
415 | fmt_puts(*argv, &left); |
| |
416 | argv++; |
417 | fmt_putc(' ', &left); |
418 | } |
419 | return; |
420 | nothing: |
421 | putchar('-'); |
422 | } |
423 | |
424 | static void |
425 | pr_header(time_t *nowp, int nusers) |
426 | { |
427 | double avenrun[3]; |
428 | struct timespec boottime; |
429 | time_t uptime; |
430 | int days, hrs, i, mins; |
431 | char buf[256]; |
432 | |
433 | |
434 | |
435 | |
436 | (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp)); |
437 | buf[sizeof(buf) - 1] = '\0'; |
438 | (void)printf("%s ", buf); |
439 | |
440 | |
441 | |
442 | |
443 | if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) { |
444 | uptime = boottime.tv_sec; |
445 | if (uptime > 59) { |
446 | uptime += 30; |
447 | days = uptime / SECSPERDAY; |
448 | uptime %= SECSPERDAY; |
449 | hrs = uptime / SECSPERHOUR; |
450 | uptime %= SECSPERHOUR; |
451 | mins = uptime / 60; |
452 | (void)printf(" up"); |
453 | if (days > 0) |
454 | (void)printf(" %d day%s,", days, |
455 | days > 1 ? "s" : ""); |
456 | if (hrs > 0 && mins > 0) |
457 | (void)printf(" %2d:%02d,", hrs, mins); |
458 | else { |
459 | if (hrs > 0) |
460 | (void)printf(" %d hr%s,", |
461 | hrs, hrs > 1 ? "s" : ""); |
462 | if (mins > 0 || (days == 0 && hrs == 0)) |
463 | (void)printf(" %d min%s,", |
464 | mins, mins != 1 ? "s" : ""); |
465 | } |
466 | } else |
467 | printf(" %d secs,", (int)uptime); |
468 | } |
469 | |
470 | |
471 | (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); |
472 | |
473 | |
474 | |
475 | |
476 | if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) |
477 | (void)printf(", no load average information available\n"); |
478 | else { |
479 | (void)printf(", load averages:"); |
480 | for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { |
481 | if (i > 0) |
482 | (void)printf(","); |
483 | (void)printf(" %.2f", avenrun[i]); |
484 | } |
485 | (void)printf("\n"); |
486 | } |
487 | } |
488 | |
489 | static struct stat * |
490 | ttystat(char *line) |
491 | { |
492 | static struct stat sb; |
493 | char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE]; |
494 | |
495 | |
496 | (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf)); |
497 | (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf)); |
498 | if (stat(ttybuf, &sb)) |
499 | return (NULL); |
500 | return (&sb); |
501 | } |
502 | |
503 | static void |
504 | usage(int wcmd) |
505 | { |
506 | if (wcmd) |
507 | (void)fprintf(stderr, |
508 | "usage: w [-ahi] [-M core] [-N system] [user]\n"); |
509 | else |
510 | (void)fprintf(stderr, |
511 | "usage: uptime\n"); |
512 | exit (1); |
513 | } |