Annotation of src/usr.bin/mail/popen.c, Revision 1.26
1.26 ! millert 1: /* $OpenBSD: popen.c,v 1.25 2001/01/16 05:36:08 millert Exp $ */
1.6 millert 2: /* $NetBSD: popen.c,v 1.6 1997/05/13 06:48:42 mikel Exp $ */
1.2 deraadt 3:
1.1 deraadt 4: /*
5: * Copyright (c) 1980, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
1.2 deraadt 38: #if 0
39: static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/6/93";
40: #else
1.26 ! millert 41: static char rcsid[] = "$OpenBSD: popen.c,v 1.25 2001/01/16 05:36:08 millert Exp $";
1.2 deraadt 42: #endif
1.1 deraadt 43: #endif /* not lint */
44:
45: #include "rcv.h"
46: #include <sys/wait.h>
47: #include <fcntl.h>
1.12 deraadt 48: #include <errno.h>
1.25 millert 49: #ifdef __STDC__
50: #include <stdarg.h>
51: #else
52: #include <varargs.h>
53: #endif
1.1 deraadt 54: #include "extern.h"
55:
56: #define READ 0
57: #define WRITE 1
58:
59: struct fp {
60: FILE *fp;
61: int pipe;
62: int pid;
63: struct fp *link;
64: };
65: static struct fp *fp_head;
66:
67: struct child {
68: int pid;
69: char done;
70: char free;
1.13 millert 71: int status;
1.1 deraadt 72: struct child *link;
73: };
1.15 niklas 74: static struct child *child, *child_freelist = NULL;
75: static struct child *findchild __P((int, int));
1.1 deraadt 76: static void delchild __P((struct child *));
1.2 deraadt 77: static int file_pid __P((FILE *));
1.4 millert 78: static int handle_spool_locks __P((int));
1.1 deraadt 79:
80: FILE *
81: Fopen(file, mode)
82: char *file, *mode;
83: {
84: FILE *fp;
85:
86: if ((fp = fopen(file, mode)) != NULL) {
87: register_file(fp, 0, 0);
1.7 millert 88: (void)fcntl(fileno(fp), F_SETFD, 1);
1.1 deraadt 89: }
1.6 millert 90: return(fp);
1.1 deraadt 91: }
92:
93: FILE *
94: Fdopen(fd, mode)
95: int fd;
96: char *mode;
97: {
98: FILE *fp;
99:
100: if ((fp = fdopen(fd, mode)) != NULL) {
101: register_file(fp, 0, 0);
1.7 millert 102: (void)fcntl(fileno(fp), F_SETFD, 1);
1.1 deraadt 103: }
1.6 millert 104: return(fp);
1.1 deraadt 105: }
106:
107: int
108: Fclose(fp)
109: FILE *fp;
110: {
111: unregister_file(fp);
1.6 millert 112: return(fclose(fp));
1.1 deraadt 113: }
114:
115: FILE *
116: Popen(cmd, mode)
117: char *cmd;
118: char *mode;
119: {
120: int p[2];
121: int myside, hisside, fd0, fd1;
122: int pid;
1.2 deraadt 123: sigset_t nset;
1.1 deraadt 124: FILE *fp;
125:
126: if (pipe(p) < 0)
1.6 millert 127: return(NULL);
1.7 millert 128: (void)fcntl(p[READ], F_SETFD, 1);
129: (void)fcntl(p[WRITE], F_SETFD, 1);
1.1 deraadt 130: if (*mode == 'r') {
131: myside = p[READ];
1.25 millert 132: hisside = fd0 = fd1 = p[WRITE];
1.1 deraadt 133: } else {
134: myside = p[WRITE];
135: hisside = fd0 = p[READ];
136: fd1 = -1;
137: }
1.2 deraadt 138: sigemptyset(&nset);
1.25 millert 139: if ((pid = start_command(value("SHELL"), &nset, fd0, fd1,
140: "-c", cmd, NULL)) < 0) {
1.6 millert 141: (void)close(p[READ]);
142: (void)close(p[WRITE]);
143: return(NULL);
1.1 deraadt 144: }
1.6 millert 145: (void)close(hisside);
1.1 deraadt 146: if ((fp = fdopen(myside, mode)) != NULL)
147: register_file(fp, 1, pid);
1.6 millert 148: return(fp);
1.1 deraadt 149: }
150:
151: int
152: Pclose(ptr)
153: FILE *ptr;
154: {
155: int i;
1.2 deraadt 156: sigset_t nset, oset;
1.1 deraadt 157:
158: i = file_pid(ptr);
159: unregister_file(ptr);
1.6 millert 160: (void)fclose(ptr);
1.2 deraadt 161: sigemptyset(&nset);
162: sigaddset(&nset, SIGINT);
163: sigaddset(&nset, SIGHUP);
164: sigprocmask(SIG_BLOCK, &nset, &oset);
1.1 deraadt 165: i = wait_child(i);
1.2 deraadt 166: sigprocmask(SIG_SETMASK, &oset, NULL);
1.6 millert 167: return(i);
1.1 deraadt 168: }
169:
170: void
171: close_all_files()
172: {
173:
174: while (fp_head)
175: if (fp_head->pipe)
1.6 millert 176: (void)Pclose(fp_head->fp);
1.1 deraadt 177: else
1.6 millert 178: (void)Fclose(fp_head->fp);
1.1 deraadt 179: }
180:
181: void
182: register_file(fp, pipe, pid)
183: FILE *fp;
184: int pipe, pid;
185: {
186: struct fp *fpp;
187:
1.7 millert 188: if ((fpp = (struct fp *)malloc(sizeof(*fpp))) == NULL)
1.14 millert 189: errx(1, "Out of memory");
1.1 deraadt 190: fpp->fp = fp;
191: fpp->pipe = pipe;
192: fpp->pid = pid;
193: fpp->link = fp_head;
194: fp_head = fpp;
195: }
196:
197: void
198: unregister_file(fp)
199: FILE *fp;
200: {
201: struct fp **pp, *p;
202:
1.2 deraadt 203: for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
1.1 deraadt 204: if (p->fp == fp) {
205: *pp = p->link;
1.7 millert 206: (void)free(p);
1.1 deraadt 207: return;
208: }
1.14 millert 209: errx(1, "Invalid file pointer");
1.1 deraadt 210: }
211:
1.2 deraadt 212: static int
1.1 deraadt 213: file_pid(fp)
214: FILE *fp;
215: {
216: struct fp *p;
217:
218: for (p = fp_head; p; p = p->link)
219: if (p->fp == fp)
1.6 millert 220: return(p->pid);
1.14 millert 221: errx(1, "Invalid file pointer");
1.1 deraadt 222: /*NOTREACHED*/
223: }
224:
225: /*
226: * Run a command without a shell, with optional arguments and splicing
1.26 ! millert 227: * of stdin (-1 means none) and stdout. The command name can be a sequence
! 228: * of words.
1.1 deraadt 229: * Signals must be handled by the caller.
1.20 millert 230: * "nset" contains the signals to ignore in the new process.
231: * SIGINT is enabled unless it's in "nset".
1.1 deraadt 232: */
233: int
1.25 millert 234: start_commandv(cmd, nset, infd, outfd, args)
1.1 deraadt 235: char *cmd;
1.10 millert 236: sigset_t *nset;
1.2 deraadt 237: int infd, outfd;
1.25 millert 238: va_list args;
1.1 deraadt 239: {
240: int pid;
241:
1.25 millert 242: if ((pid = fork()) < 0) {
1.6 millert 243: warn("fork");
244: return(-1);
1.1 deraadt 245: }
246: if (pid == 0) {
247: char *argv[100];
1.6 millert 248: int i = getrawlist(cmd, argv, sizeof(argv)/ sizeof(*argv));
1.1 deraadt 249:
1.25 millert 250: while ((argv[i++] = va_arg(args, char *)))
251: ;
252: argv[i] = NULL;
1.10 millert 253: prepare_child(nset, infd, outfd);
1.1 deraadt 254: execvp(argv[0], argv);
1.24 millert 255: warn("%s", argv[0]);
1.1 deraadt 256: _exit(1);
257: }
1.6 millert 258: return(pid);
1.1 deraadt 259: }
260:
1.25 millert 261: int
262: #ifdef __STDC__
263: run_command(char *cmd, sigset_t *nset, int infd, int outfd, ...)
264: #else
265: run_command(cmd, nset, infd, outfd, va_alist)
266: char *cmd;
267: sigset_t *nset;
268: int infd;
269: int outfd;
270: va_dcl
271: #endif
272: {
273: int pid;
274: va_list args;
275:
276: #ifdef __STDC__
277: va_start(args, outfd);
278: #else
279: va_start(args);
280: #endif
281: pid = start_commandv(cmd, nset, infd, outfd, args);
282: va_end(args);
283: if (pid < 0)
284: return(-1);
285: return(wait_command(pid));
286: }
287:
288: int
289: #ifdef __STDC__
290: start_command(char *cmd, sigset_t *nset, int infd, int outfd, ...)
291: #else
292: start_command(cmd, nset, infd, outfd, va_alist)
293: char *cmd;
294: sigset_t *nset;
295: int infd;
296: int outfd;
297: va_dcl
298: #endif
299: {
300: va_list args;
301: int r;
302:
303: #ifdef __STDC__
304: va_start(args, outfd);
305: #else
306: va_start(args);
307: #endif
308: r = start_commandv(cmd, nset, infd, outfd, args);
309: va_end(args);
310: return(r);
311: }
312:
1.1 deraadt 313: void
1.2 deraadt 314: prepare_child(nset, infd, outfd)
315: sigset_t *nset;
316: int infd, outfd;
1.1 deraadt 317: {
318: int i;
1.9 millert 319: sigset_t eset;
1.1 deraadt 320:
321: /*
322: * All file descriptors other than 0, 1, and 2 are supposed to be
323: * close-on-exec.
324: */
1.26 ! millert 325: if (infd > 0) {
1.1 deraadt 326: dup2(infd, 0);
1.26 ! millert 327: } else if (infd != 0) {
1.25 millert 328: /* we don't want the child stealing my stdin input */
329: close(0);
330: open(_PATH_DEVNULL, O_RDONLY, 0);
331: }
1.26 ! millert 332: if (outfd >= 0 && outfd != 1)
1.1 deraadt 333: dup2(outfd, 1);
1.6 millert 334: if (nset == NULL)
335: return;
336: if (nset != NULL) {
1.5 deraadt 337: for (i = 1; i < NSIG; i++)
1.3 dm 338: if (sigismember(nset, i))
1.7 millert 339: (void)signal(i, SIG_IGN);
1.3 dm 340: }
1.6 millert 341: if (nset == NULL || !sigismember(nset, SIGINT))
1.7 millert 342: (void)signal(SIGINT, SIG_DFL);
1.9 millert 343: sigemptyset(&eset);
344: (void)sigprocmask(SIG_SETMASK, &eset, NULL);
1.1 deraadt 345: }
346:
347: int
348: wait_command(pid)
349: int pid;
350: {
351:
352: if (wait_child(pid) < 0) {
1.6 millert 353: puts("Fatal error in process.");
354: return(-1);
1.1 deraadt 355: }
1.6 millert 356: return(0);
1.1 deraadt 357: }
358:
359: static struct child *
1.15 niklas 360: findchild(pid, dont_alloc)
1.1 deraadt 361: int pid;
1.15 niklas 362: int dont_alloc;
1.1 deraadt 363: {
1.14 millert 364: struct child **cpp;
1.1 deraadt 365:
366: for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
367: cpp = &(*cpp)->link)
368: ;
369: if (*cpp == NULL) {
1.15 niklas 370: if (dont_alloc)
371: return(NULL);
372: if (child_freelist) {
373: *cpp = child_freelist;
374: child_freelist = (*cpp)->link;
375: } else
376: *cpp = (struct child *)malloc(sizeof(struct child));
1.1 deraadt 377: (*cpp)->pid = pid;
378: (*cpp)->done = (*cpp)->free = 0;
379: (*cpp)->link = NULL;
380: }
1.6 millert 381: return(*cpp);
1.1 deraadt 382: }
383:
384: static void
385: delchild(cp)
1.14 millert 386: struct child *cp;
1.1 deraadt 387: {
1.14 millert 388: struct child **cpp;
1.1 deraadt 389:
390: for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
391: ;
392: *cpp = cp->link;
1.15 niklas 393: cp->link = child_freelist;
394: child_freelist = cp;
1.1 deraadt 395: }
396:
397: void
398: sigchild(signo)
399: int signo;
400: {
401: int pid;
1.13 millert 402: int status;
1.14 millert 403: struct child *cp;
1.11 deraadt 404: int save_errno = errno;
1.1 deraadt 405:
406: while ((pid =
1.13 millert 407: waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
1.15 niklas 408: cp = findchild(pid, 1);
409: if (!cp)
410: continue;
1.1 deraadt 411: if (cp->free)
412: delchild(cp);
413: else {
414: cp->done = 1;
415: cp->status = status;
416: }
417: }
1.11 deraadt 418: errno = save_errno;
1.1 deraadt 419: }
420:
1.13 millert 421: int wait_status;
1.1 deraadt 422:
423: /*
424: * Wait for a specific child to die.
425: */
426: int
427: wait_child(pid)
428: int pid;
429: {
1.20 millert 430: struct child *cp;
1.2 deraadt 431: sigset_t nset, oset;
1.21 millert 432: int rv = 0;
1.9 millert 433:
1.2 deraadt 434: sigemptyset(&nset);
435: sigaddset(&nset, SIGCHLD);
436: sigprocmask(SIG_BLOCK, &nset, &oset);
1.21 millert 437: /*
438: * If we have not already waited on the pid (via sigchild)
439: * wait on it now. Otherwise, use the wait status stashed
440: * by sigchild.
441: */
442: cp = findchild(pid, 1);
443: if (cp == NULL || !cp->done)
444: rv = waitpid(pid, &wait_status, 0);
445: else
446: wait_status = cp->status;
447: if (cp != NULL)
448: delchild(cp);
449: sigprocmask(SIG_SETMASK, &oset, NULL);
450: if (rv == -1 || (WIFEXITED(wait_status) && WEXITSTATUS(wait_status)))
1.20 millert 451: return(-1);
1.21 millert 452: else
453: return(0);
1.1 deraadt 454: }
455:
456: /*
457: * Mark a child as don't care.
458: */
459: void
460: free_child(pid)
461: int pid;
462: {
1.20 millert 463: struct child *cp;
1.2 deraadt 464: sigset_t nset, oset;
1.17 millert 465:
1.2 deraadt 466: sigemptyset(&nset);
467: sigaddset(&nset, SIGCHLD);
468: sigprocmask(SIG_BLOCK, &nset, &oset);
1.21 millert 469: if ((cp = findchild(pid, 0)) != NULL) {
470: if (cp->done)
471: delchild(cp);
472: else
473: cp->free = 1;
474: }
1.2 deraadt 475: sigprocmask(SIG_SETMASK, &oset, NULL);
1.4 millert 476: }
477:
478: /*
1.22 millert 479: * Lock(1)/unlock(0) mail spool using lockspool(1).
1.4 millert 480: * Returns 1 for success, 0 for failure, -1 for bad usage.
481: */
482: static int
483: handle_spool_locks(action)
484: int action;
485: {
486: static FILE *lockfp = NULL;
487: static int lock_pid;
488:
489: if (action == 0) {
490: /* Clear the lock */
491: if (lockfp == NULL) {
1.6 millert 492: fputs("handle_spool_locks: no spool lock to remove.\n",
493: stderr);
494: return(-1);
1.4 millert 495: }
496: (void)kill(lock_pid, SIGTERM);
1.6 millert 497: (void)Pclose(lockfp);
1.4 millert 498: lockfp = NULL;
499: } else if (action == 1) {
1.25 millert 500: char cmd[128];
1.23 millert 501:
502: /* XXX - lockspool requires root for user arg, we do not */
1.25 millert 503: if (snprintf(cmd, sizeof(cmd), "%s %s", _PATH_LOCKSPOOL, uflag ? myname : "") < 0)
1.23 millert 504: errx(1, "Out of memory");
505:
1.4 millert 506: /* Create the lock */
1.23 millert 507: lockfp = Popen(cmd, "r");
1.25 millert 508: if (lockfp == NULL)
509: return(0);
510: if (getc(lockfp) != '1') {
511: Pclose(lockfp);
1.4 millert 512: lockfp = NULL;
1.6 millert 513: return(0);
1.4 millert 514: }
515: lock_pid = fp_head->pid; /* new entries added at head */
516: } else {
1.19 millert 517: (void)fprintf(stderr, "handle_spool_locks: unknown action %d\n",
1.4 millert 518: action);
1.6 millert 519: return(-1);
1.4 millert 520: }
521:
1.6 millert 522: return(1);
1.4 millert 523: }
524:
525: int
526: spool_lock()
527: {
528: return(handle_spool_locks(1));
529: }
530:
531: int
532: spool_unlock()
533: {
534: return(handle_spool_locks(0));
1.1 deraadt 535: }
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