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
61 static char *argv_start = NULL;
62 static size_t argv_env_len = 0;
63 #endif
64 
65 #endif /* HAVE_SETPROCTITLE */
66 
67 void
68 compat_init_setproctitle(int argc, char *argv[])
69 {
70 #if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
71 	extern char **environ;
72 	char *lastargv = NULL;
73 	char **envp = environ;
74 	int i;
75 
76 	/*
77 	 * NB: This assumes that argv has already been copied out of the
78 	 * way. This is true for sshd, but may not be true for other
79 	 * programs. Beware.
80 	 */
81 
82 	if (argc == 0 || argv[0] == NULL)
83 		return;
84 
85 	/* Fail if we can't allocate room for the new environment */
86 	for (i = 0; envp[i] != NULL; i++)
87 		;
88 	if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
89 		environ = envp;	/* put it back */
90 		return;
91 	}
92 
93 	/*
94 	 * Find the last argv string or environment variable within
95 	 * our process memory area.
96 	 */
97 	for (i = 0; i < argc; i++) {
98 		if (lastargv == NULL || lastargv + 1 == argv[i])
99 			lastargv = argv[i] + strlen(argv[i]);
100 	}
101 	for (i = 0; envp[i] != NULL; i++) {
102 		if (lastargv + 1 == envp[i])
103 			lastargv = envp[i] + strlen(envp[i]);
104 	}
105 
106 	argv[1] = NULL;
107 	argv_start = argv[0];
108 	argv_env_len = lastargv - argv[0] - 1;
109 
110 	/*
111 	 * Copy environment
112 	 * XXX - will truncate env on strdup fail
113 	 */
114 	for (i = 0; envp[i] != NULL; i++)
115 		environ[i] = strdup(envp[i]);
116 	environ[i] = NULL;
117 #endif /* SPT_REUSEARGV */
118 }
119 
120 #ifndef HAVE_SETPROCTITLE
121 void
122 setproctitle(const char *fmt, ...)
123 {
124 #if SPT_TYPE != SPT_NONE
125 	va_list ap;
126 	char buf[1024], ptitle[1024];
127 	size_t len;
128 	int r;
129 	extern char *__progname;
130 #if SPT_TYPE == SPT_PSTAT
131 	union pstun pst;
132 #endif
133 
134 #if SPT_TYPE == SPT_REUSEARGV
135 	if (argv_env_len <= 0)
136 		return;
137 #endif
138 
139 	strlcpy(buf, __progname, sizeof(buf));
140 
141 	r = -1;
142 	va_start(ap, fmt);
143 	if (fmt != NULL) {
144 		len = strlcat(buf, ": ", sizeof(buf));
145 		if (len < sizeof(buf))
146 			r = vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
147 	}
148 	va_end(ap);
149 	if (r == -1 || (size_t)r >= sizeof(buf) - len)
150 		return;
151 	strnvis(ptitle, buf, sizeof(ptitle),
152 	    VIS_CSTYLE|VIS_NL|VIS_TAB|VIS_OCTAL);
153 
154 #if SPT_TYPE == SPT_PSTAT
155 	pst.pst_command = ptitle;
156 	pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
157 #elif SPT_TYPE == SPT_REUSEARGV
158 /*	debug("setproctitle: copy \"%s\" into len %d",
159 	    buf, argv_env_len); */
160 	len = strlcpy(argv_start, ptitle, argv_env_len);
161 	for(; len < argv_env_len; len++)
162 		argv_start[len] = SPT_PADCHAR;
163 #endif
164 
165 #endif /* SPT_NONE */
166 }
167 
168 #endif /* HAVE_SETPROCTITLE */
169