mail.local.c revision 94337 
1/*
2 * Copyright (c) 1998-2002 Sendmail, Inc. and its suppliers.
3 *	All rights reserved.
4 * Copyright (c) 1990, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * By using this file, you agree to the terms and conditions set
8 * forth in the LICENSE file which can be found at the top level of
9 * the sendmail distribution.
10 *
11 */
12
13#include <sm/gen.h>
14
15SM_IDSTR(copyright,
16"@(#) Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.\n\
17	All rights reserved.\n\
18     Copyright (c) 1990, 1993, 1994\n\
19	The Regents of the University of California.  All rights reserved.\n")
20
21SM_IDSTR(id, "@(#)$Id: mail.local.c,v 8.238 2002/03/30 07:43:21 geir Exp $")
22
23#include <stdlib.h>
24#include <sm/errstring.h>
25#include <sm/io.h>
26#include <sm/limits.h>
27# include <unistd.h>
28# ifdef EX_OK
29#  undef EX_OK		/* unistd.h may have another use for this */
30# endif /* EX_OK */
31#include <sm/mbdb.h>
32#include <sm/sysexits.h>
33
34/* $FreeBSD: head/contrib/sendmail/mail.local/mail.local.c 94337 2002-04-10 03:06:22Z gshapiro $ */
35
36/*
37**  This is not intended to work on System V derived systems
38**  such as Solaris or HP-UX, since they use a totally different
39**  approach to mailboxes (essentially, they have a set-group-ID program
40**  rather than set-user-ID, and they rely on the ability to "give away"
41**  files to do their work).  IT IS NOT A BUG that this doesn't
42**  work on such architectures.
43*/
44
45
46#include <stdio.h>
47#include <errno.h>
48#include <fcntl.h>
49#include <sys/types.h>
50#include <sys/stat.h>
51#include <time.h>
52#include <stdlib.h>
53# include <sys/socket.h>
54# include <sys/file.h>
55# include <netinet/in.h>
56# include <arpa/nameser.h>
57# include <netdb.h>
58# include <pwd.h>
59
60#include <sm/string.h>
61#include <syslog.h>
62#include <ctype.h>
63
64#include <sm/conf.h>
65#include <sendmail/pathnames.h>
66
67
68/* additional mode for open() */
69# define EXTRA_MODE 0
70
71
72#ifndef LOCKTO_RM
73# define LOCKTO_RM	300	/* timeout for stale lockfile removal */
74#endif /* ! LOCKTO_RM */
75#ifndef LOCKTO_GLOB
76# define LOCKTO_GLOB	400	/* global timeout for lockfile creation */
77#endif /* ! LOCKTO_GLOB */
78
79/* define a realloc() which works for NULL pointers */
80#define REALLOC(ptr, size)	(((ptr) == NULL) ? malloc(size) : realloc(ptr, size))
81
82/*
83**  If you don't have flock, you could try using lockf instead.
84*/
85
86#ifdef LDA_USE_LOCKF
87# define flock(a, b)	lockf(a, b, 0)
88# ifdef LOCK_EX
89#  undef LOCK_EX
90# endif /* LOCK_EX */
91# define LOCK_EX	F_LOCK
92#endif /* LDA_USE_LOCKF */
93
94#ifndef LOCK_EX
95# include <sys/file.h>
96#endif /* ! LOCK_EX */
97
98/*
99**  If you don't have setreuid, and you have saved uids, and you have
100**  a seteuid() call that doesn't try to emulate using setuid(), then
101**  you can try defining LDA_USE_SETEUID.
102*/
103
104#ifdef LDA_USE_SETEUID
105# define setreuid(r, e)		seteuid(e)
106#endif /* LDA_USE_SETEUID */
107
108#ifdef LDA_CONTENTLENGTH
109# define CONTENTLENGTH	1
110#endif /* LDA_CONTENTLENGTH */
111
112#ifndef INADDRSZ
113# define INADDRSZ	4		/* size of an IPv4 address in bytes */
114#endif /* ! INADDRSZ */
115
116#ifdef MAILLOCK
117# include <maillock.h>
118#endif /* MAILLOCK */
119
120#ifndef MAILER_DAEMON
121# define MAILER_DAEMON	"MAILER-DAEMON"
122#endif /* ! MAILER_DAEMON */
123
124#ifdef CONTENTLENGTH
125char	ContentHdr[40] = "Content-Length: ";
126off_t	HeaderLength;
127off_t	BodyLength;
128#endif /* CONTENTLENGTH */
129
130bool	EightBitMime = true;		/* advertise 8BITMIME in LMTP */
131char	ErrBuf[10240];			/* error buffer */
132int	ExitVal = EX_OK;		/* sysexits.h error value. */
133bool	nobiff = false;
134bool	nofsync = false;
135bool	HoldErrs = false;		/* Hold errors in ErrBuf */
136bool	LMTPMode = false;
137bool	BounceQuota = false;		/* permanent error when over quota */
138char	*HomeMailFile = NULL;		/* store mail in homedir */
139
140void	deliver __P((int, char *));
141int	e_to_sys __P((int));
142void	notifybiff __P((char *));
143int	store __P((char *, bool *));
144void	usage __P((void));
145int	lockmbox __P((char *));
146void	unlockmbox __P((void));
147void	mailerr __P((const char *, const char *, ...));
148void	flush_error __P((void));
149
150
151int
152main(argc, argv)
153	int argc;
154	char *argv[];
155{
156	struct passwd *pw;
157	int ch, fd;
158	uid_t uid;
159	char *from;
160	char *mbdbname = "pw";
161	int err;
162	extern char *optarg;
163	extern int optind;
164
165
166	/* make sure we have some open file descriptors */
167	for (fd = 10; fd < 30; fd++)
168		(void) close(fd);
169
170	/* use a reasonable umask */
171	(void) umask(0077);
172
173# ifdef LOG_MAIL
174	openlog("mail.local", 0, LOG_MAIL);
175# else /* LOG_MAIL */
176	openlog("mail.local", 0);
177# endif /* LOG_MAIL */
178
179	from = NULL;
180	while ((ch = getopt(argc, argv, "7BbdD:f:h:r:ls")) != -1)
181	{
182		switch(ch)
183		{
184		  case '7':		/* Do not advertise 8BITMIME */
185			EightBitMime = false;
186			break;
187
188		  case 'B':
189			nobiff = true;
190			break;
191
192		  case 'b':		/* bounce mail when over quota. */
193			BounceQuota = true;
194			break;
195
196		  case 'd':		/* Backward compatible. */
197			break;
198
199		  case 'D':		/* mailbox database type */
200			mbdbname = optarg;
201			break;
202
203		  case 'f':
204		  case 'r':		/* Backward compatible. */
205			if (from != NULL)
206			{
207				mailerr(NULL, "Multiple -f options");
208				usage();
209			}
210			from = optarg;
211			break;
212
213		  case 'h':
214			if (optarg != NULL || *optarg != '\0')
215				HomeMailFile = optarg;
216			else
217			{
218				mailerr(NULL, "-h: missing filename");
219				usage();
220			}
221			break;
222
223		  case 'l':
224			LMTPMode = true;
225			break;
226
227		  case 's':
228			nofsync++;
229			break;
230
231		  case '?':
232		  default:
233			usage();
234		}
235	}
236	argc -= optind;
237	argv += optind;
238
239	/* initialize biff structures */
240	if (!nobiff)
241		notifybiff(NULL);
242
243	err = sm_mbdb_initialize(mbdbname);
244	if (err != EX_OK)
245	{
246		char *errcode = "521";
247
248		if (err == EX_TEMPFAIL)
249			errcode = "421";
250
251		mailerr(errcode, "Can not open mailbox database %s: %s",
252			mbdbname, sm_strexit(err));
253		exit(err);
254	}
255
256	if (LMTPMode)
257	{
258		extern void dolmtp __P((void));
259
260		if (argc > 0)
261		{
262			mailerr("421", "Users should not be specified in command line if LMTP required");
263			exit(EX_TEMPFAIL);
264		}
265
266		dolmtp();
267		/* NOTREACHED */
268		exit(EX_OK);
269	}
270
271	/* Non-LMTP from here on out */
272	if (*argv == '\0')
273		usage();
274
275	/*
276	**  If from not specified, use the name from getlogin() if the
277	**  uid matches, otherwise, use the name from the password file
278	**  corresponding to the uid.
279	*/
280
281	uid = getuid();
282	if (from == NULL && ((from = getlogin()) == NULL ||
283			     (pw = getpwnam(from)) == NULL ||
284			     pw->pw_uid != uid))
285		from = (pw = getpwuid(uid)) != NULL ? pw->pw_name : "???";
286
287	/*
288	**  There is no way to distinguish the error status of one delivery
289	**  from the rest of the deliveries.  So, if we failed hard on one
290	**  or more deliveries, but had no failures on any of the others, we
291	**  return a hard failure.  If we failed temporarily on one or more
292	**  deliveries, we return a temporary failure regardless of the other
293	**  failures.  This results in the delivery being reattempted later
294	**  at the expense of repeated failures and multiple deliveries.
295	*/
296
297	HoldErrs = true;
298	fd = store(from, NULL);
299	HoldErrs = false;
300	if (fd < 0)
301	{
302		flush_error();
303		exit(ExitVal);
304	}
305	for (; *argv != NULL; ++argv)
306		deliver(fd, *argv);
307	exit(ExitVal);
308	/* NOTREACHED */
309	return ExitVal;
310}
311
312char *
313parseaddr(s, rcpt)
314	char *s;
315	bool rcpt;
316{
317	char *p;
318	int l;
319
320	if (*s++ != '<')
321		return NULL;
322
323	p = s;
324
325	/* at-domain-list */
326	while (*p == '@')
327	{
328		p++;
329		while (*p != ',' && *p != ':' && *p != '\0')
330			p++;
331		if (*p == '\0')
332			return NULL;
333
334		/* Skip over , or : */
335		p++;
336	}
337
338	s = p;
339
340	/* local-part */
341	while (*p != '\0' && *p != '@' && *p != '>')
342	{
343		if (*p == '\\')
344		{
345			if (*++p == '\0')
346				return NULL;
347		}
348		else if (*p == '\"')
349		{
350			p++;
351			while (*p != '\0' && *p != '\"')
352			{
353				if (*p == '\\')
354				{
355					if (*++p == '\0')
356						return NULL;
357				}
358				p++;
359			}
360			if (*p == '\0' || *(p + 1) == '\0')
361				return NULL;
362		}
363		/* +detail ? */
364		if (*p == '+' && rcpt)
365			*p = '\0';
366		p++;
367	}
368
369	/* @domain */
370	if (*p == '@')
371	{
372		if (rcpt)
373			*p++ = '\0';
374		while (*p != '\0' && *p != '>')
375			p++;
376	}
377
378	if (*p != '>')
379		return NULL;
380	else
381		*p = '\0';
382	p++;
383
384	if (*p != '\0' && *p != ' ')
385		return NULL;
386
387	if (*s == '\0')
388		s = MAILER_DAEMON;
389
390	l = strlen(s) + 1;
391	if (l < 0)
392		return NULL;
393	p = malloc(l);
394	if (p == NULL)
395	{
396		mailerr("421 4.3.0", "Memory exhausted");
397		exit(EX_TEMPFAIL);
398	}
399
400	(void) sm_strlcpy(p, s, l);
401	return p;
402}
403
404char *
405process_recipient(addr)
406	char *addr;
407{
408	SM_MBDB_T user;
409
410	switch (sm_mbdb_lookup(addr, &user))
411	{
412	  case EX_OK:
413		return NULL;
414
415	  case EX_NOUSER:
416		return "550 5.1.1 User unknown";
417
418	  case EX_TEMPFAIL:
419		return "451 4.3.0 User database failure; retry later";
420
421	  default:
422		return "550 5.3.0 User database failure";
423	}
424}
425
426#define RCPT_GROW	30
427
428void
429dolmtp()
430{
431	char *return_path = NULL;
432	char **rcpt_addr = NULL;
433	int rcpt_num = 0;
434	int rcpt_alloc = 0;
435	bool gotlhlo = false;
436	char *err;
437	int msgfd;
438	char *p;
439	int i;
440	char myhostname[1024];
441	char buf[4096];
442
443	memset(myhostname, '\0', sizeof myhostname);
444	(void) gethostname(myhostname, sizeof myhostname - 1);
445	if (myhostname[0] == '\0')
446		sm_strlcpy(myhostname, "localhost", sizeof myhostname);
447
448	printf("220 %s LMTP ready\r\n", myhostname);
449	for (;;)
450	{
451		(void) fflush(stdout);
452		if (fgets(buf, sizeof(buf) - 1, stdin) == NULL)
453			exit(EX_OK);
454		p = buf + strlen(buf) - 1;
455		if (p >= buf && *p == '\n')
456			*p-- = '\0';
457		if (p >= buf && *p == '\r')
458			*p-- = '\0';
459
460		switch (buf[0])
461		{
462		  case 'd':
463		  case 'D':
464			if (sm_strcasecmp(buf, "data") == 0)
465			{
466				bool inbody = false;
467
468				if (rcpt_num == 0)
469				{
470					mailerr("503 5.5.1", "No recipients");
471					continue;
472				}
473				HoldErrs = true;
474				msgfd = store(return_path, &inbody);
475				HoldErrs = false;
476				if (msgfd < 0 && !inbody)
477				{
478					flush_error();
479					continue;
480				}
481
482				for (i = 0; i < rcpt_num; i++)
483				{
484					if (msgfd < 0)
485					{
486						/* print error for rcpt */
487						flush_error();
488						continue;
489					}
490					p = strchr(rcpt_addr[i], '+');
491					if (p != NULL)
492						*p = '\0';
493					deliver(msgfd, rcpt_addr[i]);
494				}
495				if (msgfd >= 0)
496					(void) close(msgfd);
497				goto rset;
498			}
499			goto syntaxerr;
500			/* NOTREACHED */
501			break;
502
503		  case 'l':
504		  case 'L':
505			if (sm_strncasecmp(buf, "lhlo ", 5) == 0)
506			{
507				/* check for duplicate per RFC 1651 4.2 */
508				if (gotlhlo)
509				{
510					mailerr("503", "%s Duplicate LHLO",
511					       myhostname);
512					continue;
513				}
514				gotlhlo = true;
515				printf("250-%s\r\n", myhostname);
516				if (EightBitMime)
517					printf("250-8BITMIME\r\n");
518				printf("250-ENHANCEDSTATUSCODES\r\n");
519				printf("250 PIPELINING\r\n");
520				continue;
521			}
522			goto syntaxerr;
523			/* NOTREACHED */
524			break;
525
526		  case 'm':
527		  case 'M':
528			if (sm_strncasecmp(buf, "mail ", 5) == 0)
529			{
530				if (return_path != NULL)
531				{
532					mailerr("503 5.5.1",
533						"Nested MAIL command");
534					continue;
535				}
536				if (sm_strncasecmp(buf+5, "from:", 5) != 0 ||
537				    ((return_path = parseaddr(buf + 10,
538							      false)) == NULL))
539				{
540					mailerr("501 5.5.4",
541						"Syntax error in parameters");
542					continue;
543				}
544				printf("250 2.5.0 Ok\r\n");
545				continue;
546			}
547			goto syntaxerr;
548			/* NOTREACHED */
549			break;
550
551		  case 'n':
552		  case 'N':
553			if (sm_strcasecmp(buf, "noop") == 0)
554			{
555				printf("250 2.0.0 Ok\r\n");
556				continue;
557			}
558			goto syntaxerr;
559			/* NOTREACHED */
560			break;
561
562		  case 'q':
563		  case 'Q':
564			if (sm_strcasecmp(buf, "quit") == 0)
565			{
566				printf("221 2.0.0 Bye\r\n");
567				exit(EX_OK);
568			}
569			goto syntaxerr;
570			/* NOTREACHED */
571			break;
572
573		  case 'r':
574		  case 'R':
575			if (sm_strncasecmp(buf, "rcpt ", 5) == 0)
576			{
577				if (return_path == NULL)
578				{
579					mailerr("503 5.5.1",
580						"Need MAIL command");
581					continue;
582				}
583				if (rcpt_num >= rcpt_alloc)
584				{
585					rcpt_alloc += RCPT_GROW;
586					rcpt_addr = (char **)
587						REALLOC((char *) rcpt_addr,
588							rcpt_alloc *
589							sizeof(char **));
590					if (rcpt_addr == NULL)
591					{
592						mailerr("421 4.3.0",
593							"Memory exhausted");
594						exit(EX_TEMPFAIL);
595					}
596				}
597				if (sm_strncasecmp(buf + 5, "to:", 3) != 0 ||
598				    ((rcpt_addr[rcpt_num] = parseaddr(buf + 8,
599								      true)) == NULL))
600				{
601					mailerr("501 5.5.4",
602						"Syntax error in parameters");
603					continue;
604				}
605				err = process_recipient(rcpt_addr[rcpt_num]);
606				if (err != NULL)
607				{
608					mailerr(NULL, "%s", err);
609					continue;
610				}
611				rcpt_num++;
612				printf("250 2.1.5 Ok\r\n");
613				continue;
614			}
615			else if (sm_strcasecmp(buf, "rset") == 0)
616			{
617				printf("250 2.0.0 Ok\r\n");
618
619rset:
620				while (rcpt_num > 0)
621					free(rcpt_addr[--rcpt_num]);
622				if (return_path != NULL)
623					free(return_path);
624				return_path = NULL;
625				continue;
626			}
627			goto syntaxerr;
628			/* NOTREACHED */
629			break;
630
631		  case 'v':
632		  case 'V':
633			if (sm_strncasecmp(buf, "vrfy ", 5) == 0)
634			{
635				printf("252 2.3.3 Try RCPT to attempt delivery\r\n");
636				continue;
637			}
638			goto syntaxerr;
639			/* NOTREACHED */
640			break;
641
642		  default:
643  syntaxerr:
644			mailerr("500 5.5.2", "Syntax error");
645			continue;
646			/* NOTREACHED */
647			break;
648		}
649	}
650}
651
652int
653store(from, inbody)
654	char *from;
655	bool *inbody;
656{
657	FILE *fp = NULL;
658	time_t tval;
659	bool eline;		/* previous line was empty */
660	bool fullline = true;	/* current line is terminated */
661	bool prevfl;		/* previous line was terminated */
662	char line[2048];
663	int fd;
664	char tmpbuf[sizeof _PATH_LOCTMP + 1];
665
666	if (inbody != NULL)
667		*inbody = false;
668
669	(void) umask(0077);
670	(void) sm_strlcpy(tmpbuf, _PATH_LOCTMP, sizeof tmpbuf);
671	if ((fd = mkstemp(tmpbuf)) < 0 || (fp = fdopen(fd, "w+")) == NULL)
672	{
673		mailerr("451 4.3.0", "Unable to open temporary file");
674		return -1;
675	}
676	(void) unlink(tmpbuf);
677
678	if (LMTPMode)
679	{
680		printf("354 Go ahead\r\n");
681		(void) fflush(stdout);
682	}
683	if (inbody != NULL)
684		*inbody = true;
685
686	(void) time(&tval);
687	(void) fprintf(fp, "From %s %s", from, ctime(&tval));
688
689#ifdef CONTENTLENGTH
690	HeaderLength = 0;
691	BodyLength = -1;
692#endif /* CONTENTLENGTH */
693
694	line[0] = '\0';
695	eline = true;
696	while (fgets(line, sizeof(line), stdin) != (char *) NULL)
697	{
698		size_t line_len = 0;
699		int peek;
700
701		prevfl = fullline;	/* preserve state of previous line */
702		while (line[line_len] != '\n' && line_len < sizeof(line) - 2)
703			line_len++;
704		line_len++;
705
706		/* Check for dot-stuffing */
707		if (prevfl && LMTPMode && line[0] == '.')
708		{
709			if (line[1] == '\n' ||
710			    (line[1] == '\r' && line[2] == '\n'))
711				goto lmtpdot;
712			memcpy(line, line + 1, line_len);
713			line_len--;
714		}
715
716		/* Check to see if we have the full line from fgets() */
717		fullline = false;
718		if (line_len > 0)
719		{
720			if (line[line_len - 1] == '\n')
721			{
722				if (line_len >= 2 &&
723				    line[line_len - 2] == '\r')
724				{
725					line[line_len - 2] = '\n';
726					line[line_len - 1] = '\0';
727					line_len--;
728				}
729				fullline = true;
730			}
731			else if (line[line_len - 1] == '\r')
732			{
733				/* Did we just miss the CRLF? */
734				peek = fgetc(stdin);
735				if (peek == '\n')
736				{
737					line[line_len - 1] = '\n';
738					fullline = true;
739				}
740				else
741					(void) ungetc(peek, stdin);
742			}
743		}
744		else
745			fullline = true;
746
747#ifdef CONTENTLENGTH
748		if (prevfl && line[0] == '\n' && HeaderLength == 0)
749		{
750			eline = false;
751			if (fp != NULL)
752				HeaderLength = ftell(fp);
753			if (HeaderLength <= 0)
754			{
755				/*
756				**  shouldn't happen, unless ftell() is
757				**  badly broken
758				*/
759
760				HeaderLength = -1;
761			}
762		}
763#else /* CONTENTLENGTH */
764		if (prevfl && line[0] == '\n')
765			eline = true;
766#endif /* CONTENTLENGTH */
767		else
768		{
769			if (eline && line[0] == 'F' &&
770			    fp != NULL &&
771			    !memcmp(line, "From ", 5))
772				(void) putc('>', fp);
773			eline = false;
774#ifdef CONTENTLENGTH
775			/* discard existing "Content-Length:" headers */
776			if (prevfl && HeaderLength == 0 &&
777			    (line[0] == 'C' || line[0] == 'c') &&
778			    sm_strncasecmp(line, ContentHdr, 15) == 0)
779			{
780				/*
781				**  be paranoid: clear the line
782				**  so no "wrong matches" may occur later
783				*/
784				line[0] = '\0';
785				continue;
786			}
787#endif /* CONTENTLENGTH */
788
789		}
790		if (fp != NULL)
791		{
792			(void) fwrite(line, sizeof(char), line_len, fp);
793			if (ferror(fp))
794			{
795				mailerr("451 4.3.0",
796					"Temporary file write error");
797				(void) fclose(fp);
798				fp = NULL;
799				continue;
800			}
801		}
802	}
803
804	/* check if an error occurred */
805	if (fp == NULL)
806		return -1;
807
808	if (LMTPMode)
809	{
810		/* Got a premature EOF -- toss message and exit */
811		exit(EX_OK);
812	}
813
814	/* If message not newline terminated, need an extra. */
815	if (fp != NULL && strchr(line, '\n') == NULL)
816		(void) putc('\n', fp);
817
818  lmtpdot:
819
820#ifdef CONTENTLENGTH
821	if (fp != NULL)
822		BodyLength = ftell(fp);
823	if (HeaderLength == 0 && BodyLength > 0)	/* empty body */
824	{
825		HeaderLength = BodyLength;
826		BodyLength = 0;
827	}
828	else
829		BodyLength = BodyLength - HeaderLength - 1 ;
830
831	if (HeaderLength > 0 && BodyLength >= 0)
832	{
833		(void) sm_snprintf(line, sizeof line, "%lld\n",
834				   (LONGLONG_T) BodyLength);
835		(void) sm_strlcpy(&ContentHdr[16], line,
836				  sizeof(ContentHdr) - 16);
837	}
838	else
839		BodyLength = -1;	/* Something is wrong here */
840#endif /* CONTENTLENGTH */
841
842	/* Output a newline; note, empty messages are allowed. */
843	if (fp != NULL)
844		(void) putc('\n', fp);
845
846	if (fp == NULL || fflush(fp) == EOF || ferror(fp) != 0)
847	{
848		mailerr("451 4.3.0", "Temporary file write error");
849		if (fp != NULL)
850			(void) fclose(fp);
851		return -1;
852	}
853	return fd;
854}
855
856void
857deliver(fd, name)
858	int fd;
859	char *name;
860{
861	struct stat fsb;
862	struct stat sb;
863	char path[MAXPATHLEN];
864	int mbfd = -1, nr = 0, nw, off;
865	int exitval;
866	char *p;
867	char *errcode;
868	off_t curoff;
869#ifdef CONTENTLENGTH
870	off_t headerbytes;
871	int readamount;
872#endif /* CONTENTLENGTH */
873	char biffmsg[100], buf[8*1024];
874	SM_MBDB_T user;
875
876	/*
877	**  Disallow delivery to unknown names -- special mailboxes can be
878	**  handled in the sendmail aliases file.
879	*/
880
881	exitval = sm_mbdb_lookup(name, &user);
882	switch (exitval)
883	{
884	  case EX_OK:
885		break;
886
887	  case EX_NOUSER:
888		exitval = EX_UNAVAILABLE;
889		mailerr("550 5.1.1", "%s: User unknown", name);
890		break;
891
892	  case EX_TEMPFAIL:
893		mailerr("451 4.3.0", "%s: User database failure; retry later",
894			name);
895		break;
896
897	  default:
898		exitval = EX_UNAVAILABLE;
899		mailerr("550 5.3.0", "%s: User database failure", name);
900		break;
901	}
902
903	if (exitval != EX_OK)
904	{
905		if (ExitVal != EX_TEMPFAIL)
906			ExitVal = exitval;
907		return;
908	}
909
910	endpwent();
911
912	/*
913	**  Keep name reasonably short to avoid buffer overruns.
914	**	This isn't necessary on BSD because of the proper
915	**	definition of snprintf(), but it can cause problems
916	**	on other systems.
917	**  Also, clear out any bogus characters.
918	*/
919
920	if (strlen(name) > 40)
921		name[40] = '\0';
922	for (p = name; *p != '\0'; p++)
923	{
924		if (!isascii(*p))
925			*p &= 0x7f;
926		else if (!isprint(*p))
927			*p = '.';
928	}
929
930
931	if (HomeMailFile == NULL)
932	{
933		if (sm_snprintf(path, sizeof(path), "%s/%s",
934				_PATH_MAILDIR, name) >= sizeof(path))
935		{
936			exitval = EX_UNAVAILABLE;
937			mailerr("550 5.1.1", "%s: Invalid mailbox path", name);
938			return;
939		}
940	}
941	else if (*user.mbdb_homedir == '\0')
942	{
943		exitval = EX_UNAVAILABLE;
944		mailerr("550 5.1.1", "%s: User missing home directory", name);
945		return;
946	}
947	else if (sm_snprintf(path, sizeof(path), "%s/%s",
948			     user.mbdb_homedir, HomeMailFile) >= sizeof(path))
949	{
950		exitval = EX_UNAVAILABLE;
951		mailerr("550 5.1.1", "%s: Invalid mailbox path", name);
952		return;
953	}
954
955
956	/*
957	**  If the mailbox is linked or a symlink, fail.  There's an obvious
958	**  race here, that the file was replaced with a symbolic link after
959	**  the lstat returned, but before the open.  We attempt to detect
960	**  this by comparing the original stat information and information
961	**  returned by an fstat of the file descriptor returned by the open.
962	**
963	**  NB: this is a symptom of a larger problem, that the mail spooling
964	**  directory is writeable by the wrong users.  If that directory is
965	**  writeable, system security is compromised for other reasons, and
966	**  it cannot be fixed here.
967	**
968	**  If we created the mailbox, set the owner/group.  If that fails,
969	**  just return.  Another process may have already opened it, so we
970	**  can't unlink it.  Historically, binmail set the owner/group at
971	**  each mail delivery.  We no longer do this, assuming that if the
972	**  ownership or permissions were changed there was a reason.
973	**
974	**  XXX
975	**  open(2) should support flock'ing the file.
976	*/
977
978tryagain:
979#ifdef MAILLOCK
980	p = name;
981#else /* MAILLOCK */
982	p = path;
983#endif /* MAILLOCK */
984	if ((off = lockmbox(p)) != 0)
985	{
986		if (off == EX_TEMPFAIL || e_to_sys(off) == EX_TEMPFAIL)
987		{
988			ExitVal = EX_TEMPFAIL;
989			errcode = "451 4.3.0";
990		}
991		else
992			errcode = "551 5.3.0";
993
994		mailerr(errcode, "lockmailbox %s failed; error code %d %s",
995			p, off, errno > 0 ? sm_errstring(errno) : "");
996		return;
997	}
998
999	if (lstat(path, &sb) < 0)
1000	{
1001		int save_errno;
1002		int mode = S_IRUSR|S_IWUSR;
1003		gid_t gid = user.mbdb_gid;
1004
1005#ifdef MAILGID
1006		(void) umask(0007);
1007		gid = MAILGID;
1008		mode |= S_IRGRP|S_IWGRP;
1009#endif /* MAILGID */
1010
1011		mbfd = open(path, O_APPEND|O_CREAT|O_EXCL|O_WRONLY|EXTRA_MODE,
1012			    mode);
1013		save_errno = errno;
1014
1015		if (lstat(path, &sb) < 0)
1016		{
1017			ExitVal = EX_CANTCREAT;
1018			mailerr("550 5.2.0",
1019				"%s: lstat: file changed after open", path);
1020			goto err1;
1021		}
1022		if (mbfd < 0)
1023		{
1024			if (save_errno == EEXIST)
1025				goto tryagain;
1026
1027			/* open failed, don't try again */
1028			mailerr("450 4.2.0", "%s: %s", path,
1029				sm_errstring(save_errno));
1030			goto err0;
1031		}
1032		else if (fchown(mbfd, user.mbdb_uid, gid) < 0)
1033		{
1034			mailerr("451 4.3.0", "chown %u.%u: %s",
1035				user.mbdb_uid, gid, name);
1036			goto err1;
1037		}
1038		else
1039		{
1040			/*
1041			**  open() was successful, now close it so can
1042			**  be opened as the right owner again.
1043			**  Paranoia: reset mbdf since the file descriptor
1044			**  is no longer valid; better safe than sorry.
1045			*/
1046
1047			sb.st_uid = user.mbdb_uid;
1048			(void) close(mbfd);
1049			mbfd = -1;
1050		}
1051	}
1052	else if (sb.st_nlink != 1 || !S_ISREG(sb.st_mode))
1053	{
1054		mailerr("550 5.2.0", "%s: irregular file", path);
1055		goto err0;
1056	}
1057	else if (sb.st_uid != user.mbdb_uid)
1058	{
1059		ExitVal = EX_CANTCREAT;
1060		mailerr("550 5.2.0", "%s: wrong ownership (%d)",
1061			path, (int) sb.st_uid);
1062		goto err0;
1063	}
1064
1065	/* change UID for quota checks */
1066	if (setreuid(0, user.mbdb_uid) < 0)
1067	{
1068		mailerr("450 4.2.0", "setreuid(0, %d): %s (r=%d, e=%d)",
1069			(int) user.mbdb_uid, sm_errstring(errno),
1070			(int) getuid(), (int) geteuid());
1071		goto err1;
1072	}
1073#ifdef DEBUG
1074	fprintf(stderr, "new euid = %d\n", (int) geteuid());
1075#endif /* DEBUG */
1076	mbfd = open(path, O_APPEND|O_WRONLY|EXTRA_MODE, 0);
1077	if (mbfd < 0)
1078	{
1079		mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno));
1080		goto err0;
1081	}
1082	else if (fstat(mbfd, &fsb) < 0 ||
1083		 fsb.st_nlink != 1 ||
1084		 sb.st_nlink != 1 ||
1085		 !S_ISREG(fsb.st_mode) ||
1086		 sb.st_dev != fsb.st_dev ||
1087		 sb.st_ino != fsb.st_ino ||
1088# if HAS_ST_GEN && 0		/* AFS returns random values for st_gen */
1089		 sb.st_gen != fsb.st_gen ||
1090# endif /* HAS_ST_GEN && 0 */
1091		 sb.st_uid != fsb.st_uid)
1092	{
1093		ExitVal = EX_TEMPFAIL;
1094		mailerr("550 5.2.0", "%s: fstat: file changed after open",
1095			path);
1096		goto err1;
1097	}
1098
1099#if 0
1100	/*
1101	**  This code could be reused if we decide to add a
1102	**  per-user quota field to the sm_mbdb interface.
1103	*/
1104
1105	/*
1106	**  Fail if the user has a quota specified, and delivery of this
1107	**  message would exceed that quota.  We bounce such failures using
1108	**  EX_UNAVAILABLE, unless there were internal problems, since
1109	**  storing immense messages for later retries can cause queueing
1110	**  issues.
1111	*/
1112
1113	if (ui.quota > 0)
1114	{
1115		struct stat dsb;
1116
1117		if (fstat(fd, &dsb) < 0)
1118		{
1119			ExitVal = EX_TEMPFAIL;
1120			mailerr("451 4.3.0",
1121				"%s: fstat: can't stat temporary storage: %s",
1122				ui.mailspool, sm_errstring(errno));
1123			goto err1;
1124		}
1125
1126		if (dsb.st_size + sb.st_size + 1 > ui.quota)
1127		{
1128			ExitVal = EX_UNAVAILABLE;
1129			mailerr("551 5.2.2",
1130				"%s: Mailbox full or quota exceeded",
1131				ui.mailspool);
1132			goto err1;
1133		}
1134	}
1135#endif /* 0 */
1136
1137	/* Wait until we can get a lock on the file. */
1138	if (flock(mbfd, LOCK_EX) < 0)
1139	{
1140		mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno));
1141		goto err1;
1142	}
1143
1144	if (!nobiff)
1145	{
1146		/* Get the starting offset of the new message for biff. */
1147		curoff = lseek(mbfd, (off_t) 0, SEEK_END);
1148		(void) sm_snprintf(biffmsg, sizeof(biffmsg), "%s@%lld\n",
1149				   name, (LONGLONG_T) curoff);
1150	}
1151
1152	/* Copy the message into the file. */
1153	if (lseek(fd, (off_t) 0, SEEK_SET) == (off_t) -1)
1154	{
1155		mailerr("450 4.2.0", "Temporary file: %s",
1156			sm_errstring(errno));
1157		goto err1;
1158	}
1159#ifdef DEBUG
1160	fprintf(stderr, "before writing: euid = %d\n", (int) geteuid());
1161#endif /* DEBUG */
1162#ifdef CONTENTLENGTH
1163	headerbytes = (BodyLength >= 0) ? HeaderLength : -1 ;
1164	for (;;)
1165	{
1166		if (headerbytes == 0)
1167		{
1168			(void) sm_snprintf(buf, sizeof buf, "%s", ContentHdr);
1169			nr = strlen(buf);
1170			headerbytes = -1;
1171			readamount = 0;
1172		}
1173		else if (headerbytes > sizeof(buf) || headerbytes < 0)
1174			readamount = sizeof(buf);
1175		else
1176			readamount = headerbytes;
1177		if (readamount != 0)
1178			nr = read(fd, buf, readamount);
1179		if (nr <= 0)
1180			break;
1181		if (headerbytes > 0)
1182			headerbytes -= nr ;
1183
1184#else /* CONTENTLENGTH */
1185	while ((nr = read(fd, buf, sizeof(buf))) > 0)
1186	{
1187#endif /* CONTENTLENGTH */
1188		for (off = 0; off < nr; off += nw)
1189		{
1190			if ((nw = write(mbfd, buf + off, nr - off)) < 0)
1191			{
1192				errcode = "450 4.2.0";
1193#ifdef EDQUOT
1194				if (errno == EDQUOT && BounceQuota)
1195					errcode = "552 5.2.2";
1196#endif /* EDQUOT */
1197				mailerr(errcode, "%s: %s",
1198					path, sm_errstring(errno));
1199				goto err3;
1200			}
1201		}
1202	}
1203	if (nr < 0)
1204	{
1205		mailerr("450 4.2.0", "Temporary file: %s",
1206			sm_errstring(errno));
1207		goto err3;
1208	}
1209
1210	/* Flush to disk, don't wait for update. */
1211	if (!nofsync && fsync(mbfd) < 0)
1212	{
1213		mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno));
1214err3:
1215		(void) setreuid(0, 0);
1216#ifdef DEBUG
1217		fprintf(stderr, "reset euid = %d\n", (int) geteuid());
1218#endif /* DEBUG */
1219		(void) ftruncate(mbfd, curoff);
1220err1:		if (mbfd >= 0)
1221			(void) close(mbfd);
1222err0:		unlockmbox();
1223		return;
1224	}
1225
1226	/* Close and check -- NFS doesn't write until the close. */
1227	if (close(mbfd))
1228	{
1229		errcode = "450 4.2.0";
1230#ifdef EDQUOT
1231		if (errno == EDQUOT && BounceQuota)
1232			errcode = "552 5.2.2";
1233#endif /* EDQUOT */
1234		mailerr(errcode, "%s: %s", path, sm_errstring(errno));
1235		(void) truncate(path, curoff);
1236	}
1237	else if (!nobiff)
1238		notifybiff(biffmsg);
1239
1240	if (setreuid(0, 0) < 0)
1241	{
1242		mailerr("450 4.2.0", "setreuid(0, 0): %s",
1243			sm_errstring(errno));
1244		goto err0;
1245	}
1246#ifdef DEBUG
1247	fprintf(stderr, "reset euid = %d\n", (int) geteuid());
1248#endif /* DEBUG */
1249	unlockmbox();
1250	if (LMTPMode)
1251		printf("250 2.1.5 %s Ok\r\n", name);
1252}
1253
1254/*
1255**  user.lock files are necessary for compatibility with other
1256**  systems, e.g., when the mail spool file is NFS exported.
1257**  Alas, mailbox locking is more than just a local matter.
1258**  EPA 11/94.
1259*/
1260
1261bool	Locked = false;
1262
1263#ifdef MAILLOCK
1264int
1265lockmbox(name)
1266	char *name;
1267{
1268	int r = 0;
1269
1270	if (Locked)
1271		return 0;
1272	if ((r = maillock(name, 15)) == L_SUCCESS)
1273	{
1274		Locked = true;
1275		return 0;
1276	}
1277	switch (r)
1278	{
1279	  case L_TMPLOCK:	/* Can't create tmp file */
1280	  case L_TMPWRITE:	/* Can't write pid into lockfile */
1281	  case L_MAXTRYS:	/* Failed after retrycnt attempts */
1282		errno = 0;
1283		r = EX_TEMPFAIL;
1284		break;
1285	  case L_ERROR:		/* Check errno for reason */
1286		r = errno;
1287		break;
1288	  default:		/* other permanent errors */
1289		errno = 0;
1290		r = EX_UNAVAILABLE;
1291		break;
1292	}
1293	return r;
1294}
1295
1296void
1297unlockmbox()
1298{
1299	if (Locked)
1300		mailunlock();
1301	Locked = false;
1302}
1303#else /* MAILLOCK */
1304
1305char	LockName[MAXPATHLEN];
1306
1307int
1308lockmbox(path)
1309	char *path;
1310{
1311	int statfailed = 0;
1312	time_t start;
1313
1314	if (Locked)
1315		return 0;
1316	if (strlen(path) + 6 > sizeof LockName)
1317		return EX_SOFTWARE;
1318	(void) sm_snprintf(LockName, sizeof LockName, "%s.lock", path);
1319	(void) time(&start);
1320	for (; ; sleep(5))
1321	{
1322		int fd;
1323		struct stat st;
1324		time_t now;
1325
1326		/* global timeout */
1327		(void) time(&now);
1328		if (now > start + LOCKTO_GLOB)
1329		{
1330			errno = 0;
1331			return EX_TEMPFAIL;
1332		}
1333		fd = open(LockName, O_WRONLY|O_EXCL|O_CREAT, 0);
1334		if (fd >= 0)
1335		{
1336			/* defeat lock checking programs which test pid */
1337			(void) write(fd, "0", 2);
1338			Locked = true;
1339			(void) close(fd);
1340			return 0;
1341		}
1342		if (stat(LockName, &st) < 0)
1343		{
1344			if (statfailed++ > 5)
1345			{
1346				errno = 0;
1347				return EX_TEMPFAIL;
1348			}
1349			continue;
1350		}
1351		statfailed = 0;
1352		(void) time(&now);
1353		if (now < st.st_ctime + LOCKTO_RM)
1354			continue;
1355
1356		/* try to remove stale lockfile */
1357		if (unlink(LockName) < 0)
1358			return errno;
1359	}
1360}
1361
1362void
1363unlockmbox()
1364{
1365	if (!Locked)
1366		return;
1367	(void) unlink(LockName);
1368	Locked = false;
1369}
1370#endif /* MAILLOCK */
1371
1372void
1373notifybiff(msg)
1374	char *msg;
1375{
1376	static bool initialized = false;
1377	static int f = -1;
1378	struct hostent *hp;
1379	struct servent *sp;
1380	int len;
1381	static struct sockaddr_in addr;
1382
1383	if (!initialized)
1384	{
1385		initialized = true;
1386
1387		/* Be silent if biff service not available. */
1388		if ((sp = getservbyname("biff", "udp")) == NULL ||
1389		    (hp = gethostbyname("localhost")) == NULL ||
1390		    hp->h_length != INADDRSZ)
1391			return;
1392
1393		addr.sin_family = hp->h_addrtype;
1394		memcpy(&addr.sin_addr, hp->h_addr, INADDRSZ);
1395		addr.sin_port = sp->s_port;
1396	}
1397
1398	/* No message, just return */
1399	if (msg == NULL)
1400		return;
1401
1402	/* Couldn't initialize addr struct */
1403	if (addr.sin_family == AF_UNSPEC)
1404		return;
1405
1406	if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
1407		return;
1408	len = strlen(msg) + 1;
1409	(void) sendto(f, msg, len, 0, (struct sockaddr *) &addr, sizeof(addr));
1410}
1411
1412void
1413usage()
1414{
1415	ExitVal = EX_USAGE;
1416	mailerr(NULL, "usage: mail.local [-7] [-B] [-b] [-d] [-l] [-s] [-f from|-r from] [-h filename] user ...");
1417	exit(ExitVal);
1418}
1419
1420void
1421/*VARARGS2*/
1422#ifdef __STDC__
1423mailerr(const char *hdr, const char *fmt, ...)
1424#else /* __STDC__ */
1425mailerr(hdr, fmt, va_alist)
1426	const char *hdr;
1427	const char *fmt;
1428	va_dcl
1429#endif /* __STDC__ */
1430{
1431	size_t len = 0;
1432	SM_VA_LOCAL_DECL
1433
1434	(void) e_to_sys(errno);
1435
1436	SM_VA_START(ap, fmt);
1437
1438	if (LMTPMode && hdr != NULL)
1439	{
1440		sm_snprintf(ErrBuf, sizeof ErrBuf, "%s ", hdr);
1441		len = strlen(ErrBuf);
1442	}
1443	(void) sm_vsnprintf(&ErrBuf[len], sizeof ErrBuf - len, fmt, ap);
1444	SM_VA_END(ap);
1445
1446	if (!HoldErrs)
1447		flush_error();
1448
1449	/* Log the message to syslog. */
1450	if (!LMTPMode)
1451		syslog(LOG_ERR, "%s", ErrBuf);
1452}
1453
1454void
1455flush_error()
1456{
1457	if (LMTPMode)
1458		printf("%s\r\n", ErrBuf);
1459	else
1460	{
1461		if (ExitVal != EX_USAGE)
1462			(void) fprintf(stderr, "mail.local: ");
1463		fprintf(stderr, "%s\n", ErrBuf);
1464	}
1465}
1466
1467/*
1468 * e_to_sys --
1469 *	Guess which errno's are temporary.  Gag me.
1470 */
1471
1472int
1473e_to_sys(num)
1474	int num;
1475{
1476	/* Temporary failures override hard errors. */
1477	if (ExitVal == EX_TEMPFAIL)
1478		return ExitVal;
1479
1480	switch (num)		/* Hopefully temporary errors. */
1481	{
1482#ifdef EDQUOT
1483	  case EDQUOT:		/* Disc quota exceeded */
1484		if (BounceQuota)
1485		{
1486			ExitVal = EX_UNAVAILABLE;
1487			break;
1488		}
1489		/* FALLTHROUGH */
1490#endif /* EDQUOT */
1491#ifdef EAGAIN
1492	  case EAGAIN:		/* Resource temporarily unavailable */
1493#endif /* EAGAIN */
1494#ifdef EBUSY
1495	  case EBUSY:		/* Device busy */
1496#endif /* EBUSY */
1497#ifdef EPROCLIM
1498	  case EPROCLIM:	/* Too many processes */
1499#endif /* EPROCLIM */
1500#ifdef EUSERS
1501	  case EUSERS:		/* Too many users */
1502#endif /* EUSERS */
1503#ifdef ECONNABORTED
1504	  case ECONNABORTED:	/* Software caused connection abort */
1505#endif /* ECONNABORTED */
1506#ifdef ECONNREFUSED
1507	  case ECONNREFUSED:	/* Connection refused */
1508#endif /* ECONNREFUSED */
1509#ifdef ECONNRESET
1510	  case ECONNRESET:	/* Connection reset by peer */
1511#endif /* ECONNRESET */
1512#ifdef EDEADLK
1513	  case EDEADLK:		/* Resource deadlock avoided */
1514#endif /* EDEADLK */
1515#ifdef EFBIG
1516	  case EFBIG:		/* File too large */
1517#endif /* EFBIG */
1518#ifdef EHOSTDOWN
1519	  case EHOSTDOWN:	/* Host is down */
1520#endif /* EHOSTDOWN */
1521#ifdef EHOSTUNREACH
1522	  case EHOSTUNREACH:	/* No route to host */
1523#endif /* EHOSTUNREACH */
1524#ifdef EMFILE
1525	  case EMFILE:		/* Too many open files */
1526#endif /* EMFILE */
1527#ifdef ENETDOWN
1528	  case ENETDOWN:	/* Network is down */
1529#endif /* ENETDOWN */
1530#ifdef ENETRESET
1531	  case ENETRESET:	/* Network dropped connection on reset */
1532#endif /* ENETRESET */
1533#ifdef ENETUNREACH
1534	  case ENETUNREACH:	/* Network is unreachable */
1535#endif /* ENETUNREACH */
1536#ifdef ENFILE
1537	  case ENFILE:		/* Too many open files in system */
1538#endif /* ENFILE */
1539#ifdef ENOBUFS
1540	  case ENOBUFS:		/* No buffer space available */
1541#endif /* ENOBUFS */
1542#ifdef ENOMEM
1543	  case ENOMEM:		/* Cannot allocate memory */
1544#endif /* ENOMEM */
1545#ifdef ENOSPC
1546	  case ENOSPC:		/* No space left on device */
1547#endif /* ENOSPC */
1548#ifdef EROFS
1549	  case EROFS:		/* Read-only file system */
1550#endif /* EROFS */
1551#ifdef ESTALE
1552	  case ESTALE:		/* Stale NFS file handle */
1553#endif /* ESTALE */
1554#ifdef ETIMEDOUT
1555	  case ETIMEDOUT:	/* Connection timed out */
1556#endif /* ETIMEDOUT */
1557#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK
1558	  case EWOULDBLOCK:	/* Operation would block. */
1559#endif /* defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK */
1560		ExitVal = EX_TEMPFAIL;
1561		break;
1562
1563	  default:
1564		ExitVal = EX_UNAVAILABLE;
1565		break;
1566	}
1567	return ExitVal;
1568}
1569
1570#if defined(ultrix) || defined(_CRAY)
1571/*
1572 * Copyright (c) 1987, 1993
1573 *	The Regents of the University of California.  All rights reserved.
1574 *
1575 * Redistribution and use in source and binary forms, with or without
1576 * modification, are permitted provided that the following conditions
1577 * are met:
1578 * 1. Redistributions of source code must retain the above copyright
1579 *    notice, this list of conditions and the following disclaimer.
1580 * 2. Redistributions in binary form must reproduce the above copyright
1581 *    notice, this list of conditions and the following disclaimer in the
1582 *    documentation and/or other materials provided with the distribution.
1583 * 3. All advertising materials mentioning features or use of this software
1584 *    must display the following acknowledgement:
1585 *	This product includes software developed by the University of
1586 *	California, Berkeley and its contributors.
1587 * 4. Neither the name of the University nor the names of its contributors
1588 *    may be used to endorse or promote products derived from this software
1589 *    without specific prior written permission.
1590 *
1591 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1592 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1593 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1594 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1595 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1596 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1597 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1598 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1599 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1600 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1601 * SUCH DAMAGE.
1602 */
1603
1604# if defined(LIBC_SCCS) && !defined(lint)
1605static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
1606# endif /* defined(LIBC_SCCS) && !defined(lint) */
1607
1608# include <sys/types.h>
1609# include <sys/stat.h>
1610# include <fcntl.h>
1611# include <errno.h>
1612# include <stdio.h>
1613# include <ctype.h>
1614
1615static int _gettemp();
1616
1617mkstemp(path)
1618	char *path;
1619{
1620	int fd;
1621
1622	return (_gettemp(path, &fd) ? fd : -1);
1623}
1624
1625static
1626_gettemp(path, doopen)
1627	char *path;
1628	register int *doopen;
1629{
1630	extern int errno;
1631	register char *start, *trv;
1632	struct stat sbuf;
1633	unsigned int pid;
1634
1635	pid = getpid();
1636	for (trv = path; *trv; ++trv);		/* extra X's get set to 0's */
1637	while (*--trv == 'X')
1638	{
1639		*trv = (pid % 10) + '0';
1640		pid /= 10;
1641	}
1642
1643	/*
1644	 * check the target directory; if you have six X's and it
1645	 * doesn't exist this runs for a *very* long time.
1646	 */
1647	for (start = trv + 1;; --trv)
1648	{
1649		if (trv <= path)
1650			break;
1651		if (*trv == '/')
1652		{
1653			*trv = '\0';
1654			if (stat(path, &sbuf) < 0)
1655				return(0);
1656			if (!S_ISDIR(sbuf.st_mode))
1657			{
1658				errno = ENOTDIR;
1659				return(0);
1660			}
1661			*trv = '/';
1662			break;
1663		}
1664	}
1665
1666	for (;;)
1667	{
1668		if (doopen)
1669		{
1670			if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR,
1671					    0600)) >= 0)
1672				return(1);
1673			if (errno != EEXIST)
1674				return(0);
1675		}
1676		else if (stat(path, &sbuf) < 0)
1677			return(errno == ENOENT ? 1 : 0);
1678
1679		/* tricky little algorithm for backward compatibility */
1680		for (trv = start;;)
1681		{
1682			if (!*trv)
1683				return(0);
1684			if (*trv == 'z')
1685				*trv++ = 'a';
1686			else
1687			{
1688				if (isascii(*trv) && isdigit(*trv))
1689					*trv = 'a';
1690				else
1691					++*trv;
1692				break;
1693			}
1694		}
1695	}
1696	/* NOTREACHED */
1697}
1698#endif /* defined(ultrix) || defined(_CRAY) */
1699