setproctitle.c revision 323134 
1/* Based on conf.c from UCB sendmail 8.8.8 */
2
3/*
4 * Copyright 2003 Damien Miller
5 * Copyright (c) 1983, 1995-1997 Eric P. Allman
6 * Copyright (c) 1988, 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "includes.h"
35
36#ifndef HAVE_SETPROCTITLE
37
38#include <stdarg.h>
39#include <stdlib.h>
40#include <unistd.h>
41#ifdef HAVE_SYS_PSTAT_H
42#include <sys/pstat.h>
43#endif
44#include <string.h>
45
46#include <vis.h>
47
48#define SPT_NONE	0	/* don't use it at all */
49#define SPT_PSTAT	1	/* use pstat(PSTAT_SETCMD, ...) */
50#define SPT_REUSEARGV	2	/* cover argv with title information */
51
52#ifndef SPT_TYPE
53# define SPT_TYPE	SPT_NONE
54#endif
55
56#ifndef SPT_PADCHAR
57# define SPT_PADCHAR	'\0'
58#endif
59
60#if SPT_TYPE == SPT_REUSEARGV
61static char *argv_start = NULL;
62static size_t argv_env_len = 0;
63#endif
64
65#endif /* HAVE_SETPROCTITLE */
66
67void
68compat_init_setproctitle(int argc, char *argv[])
69{
70#if !defined(HAVE_SETPROCTITLE) && \
71    defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
72	extern char **environ;
73	char *lastargv = NULL;
74	char **envp = environ;
75	int i;
76
77	/*
78	 * NB: This assumes that argv has already been copied out of the
79	 * way. This is true for sshd, but may not be true for other
80	 * programs. Beware.
81	 */
82
83	if (argc == 0 || argv[0] == NULL)
84		return;
85
86	/* Fail if we can't allocate room for the new environment */
87	for (i = 0; envp[i] != NULL; i++)
88		;
89	if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
90		environ = envp;	/* put it back */
91		return;
92	}
93
94	/*
95	 * Find the last argv string or environment variable within
96	 * our process memory area.
97	 */
98	for (i = 0; i < argc; i++) {
99		if (lastargv == NULL || lastargv + 1 == argv[i])
100			lastargv = argv[i] + strlen(argv[i]);
101	}
102	for (i = 0; envp[i] != NULL; i++) {
103		if (lastargv + 1 == envp[i])
104			lastargv = envp[i] + strlen(envp[i]);
105	}
106
107	argv[1] = NULL;
108	argv_start = argv[0];
109	argv_env_len = lastargv - argv[0] - 1;
110
111	/*
112	 * Copy environment
113	 * XXX - will truncate env on strdup fail
114	 */
115	for (i = 0; envp[i] != NULL; i++)
116		environ[i] = strdup(envp[i]);
117	environ[i] = NULL;
118#endif /* SPT_REUSEARGV */
119}
120
121#ifndef HAVE_SETPROCTITLE
122void
123setproctitle(const char *fmt, ...)
124{
125#if SPT_TYPE != SPT_NONE
126	va_list ap;
127	char buf[1024], ptitle[1024];
128	size_t len;
129	int r;
130	extern char *__progname;
131#if SPT_TYPE == SPT_PSTAT
132	union pstun pst;
133#endif
134
135#if SPT_TYPE == SPT_REUSEARGV
136	if (argv_env_len <= 0)
137		return;
138#endif
139
140	strlcpy(buf, __progname, sizeof(buf));
141
142	r = -1;
143	va_start(ap, fmt);
144	if (fmt != NULL) {
145		len = strlcat(buf, ": ", sizeof(buf));
146		if (len < sizeof(buf))
147			r = vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
148	}
149	va_end(ap);
150	if (r == -1 || (size_t)r >= sizeof(buf) - len)
151		return;
152	strnvis(ptitle, buf, sizeof(ptitle),
153	    VIS_CSTYLE|VIS_NL|VIS_TAB|VIS_OCTAL);
154
155#if SPT_TYPE == SPT_PSTAT
156	pst.pst_command = ptitle;
157	pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
158#elif SPT_TYPE == SPT_REUSEARGV
159/*	debug("setproctitle: copy \"%s\" into len %d",
160	    buf, argv_env_len); */
161	len = strlcpy(argv_start, ptitle, argv_env_len);
162	for(; len < argv_env_len; len++)
163		argv_start[len] = SPT_PADCHAR;
164#endif
165
166#endif /* SPT_NONE */
167}
168
169#endif /* HAVE_SETPROCTITLE */
170