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 #define SPT_NONE	0	/* don't use it at all */
47 #define SPT_PSTAT	1	/* use pstat(PSTAT_SETCMD, ...) */
48 #define SPT_REUSEARGV	2	/* cover argv with title information */
49 
50 #ifndef SPT_TYPE
51 # define SPT_TYPE	SPT_NONE
52 #endif
53 
54 #ifndef SPT_PADCHAR
55 # define SPT_PADCHAR	'\0'
56 #endif
57 
58 #if SPT_TYPE == SPT_REUSEARGV
59 static char *argv_start = NULL;
60 static size_t argv_env_len = 0;
61 #endif
62 
63 #endif /* HAVE_SETPROCTITLE */
64 
65 void
66 compat_init_setproctitle(int argc, char *argv[])
67 {
68 #if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
69 	extern char **environ;
70 	char *lastargv = NULL;
71 	char **envp = environ;
72 	int i;
73 
74 	/*
75 	 * NB: This assumes that argv has already been copied out of the
76 	 * way. This is true for sshd, but may not be true for other
77 	 * programs. Beware.
78 	 */
79 
80 	if (argc == 0 || argv[0] == NULL)
81 		return;
82 
83 	/* Fail if we can't allocate room for the new environment */
84 	for (i = 0; envp[i] != NULL; i++)
85 		;
86 	if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
87 		environ = envp;	/* put it back */
88 		return;
89 	}
90 
91 	/*
92 	 * Find the last argv string or environment variable within
93 	 * our process memory area.
94 	 */
95 	for (i = 0; i < argc; i++) {
96 		if (lastargv == NULL || lastargv + 1 == argv[i])
97 			lastargv = argv[i] + strlen(argv[i]);
98 	}
99 	for (i = 0; envp[i] != NULL; i++) {
100 		if (lastargv + 1 == envp[i])
101 			lastargv = envp[i] + strlen(envp[i]);
102 	}
103 
104 	argv[1] = NULL;
105 	argv_start = argv[0];
106 	argv_env_len = lastargv - argv[0] - 1;
107 
108 	/*
109 	 * Copy environment
110 	 * XXX - will truncate env on strdup fail
111 	 */
112 	for (i = 0; envp[i] != NULL; i++)
113 		environ[i] = strdup(envp[i]);
114 	environ[i] = NULL;
115 #endif /* SPT_REUSEARGV */
116 }
117 
118 #ifndef HAVE_SETPROCTITLE
119 void
120 setproctitle(const char *fmt, ...)
121 {
122 #if SPT_TYPE != SPT_NONE
123 	va_list ap;
124 	char buf[1024];
125 	size_t len;
126 	extern char *__progname;
127 #if SPT_TYPE == SPT_PSTAT
128 	union pstun pst;
129 #endif
130 
131 #if SPT_TYPE == SPT_REUSEARGV
132 	if (argv_env_len <= 0)
133 		return;
134 #endif
135 
136 	strlcpy(buf, __progname, sizeof(buf));
137 
138 	va_start(ap, fmt);
139 	if (fmt != NULL) {
140 		len = strlcat(buf, ": ", sizeof(buf));
141 		if (len < sizeof(buf))
142 			vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
143 	}
144 	va_end(ap);
145 
146 #if SPT_TYPE == SPT_PSTAT
147 	pst.pst_command = buf;
148 	pstat(PSTAT_SETCMD, pst, strlen(buf), 0, 0);
149 #elif SPT_TYPE == SPT_REUSEARGV
150 /*	debug("setproctitle: copy \"%s\" into len %d",
151 	    buf, argv_env_len); */
152 	len = strlcpy(argv_start, buf, argv_env_len);
153 	for(; len < argv_env_len; len++)
154 		argv_start[len] = SPT_PADCHAR;
155 #endif
156 
157 #endif /* SPT_NONE */
158 }
159 
160 #endif /* HAVE_SETPROCTITLE */
161