setproctitle.c revision 162852
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 59static char *argv_start = NULL; 60static size_t argv_env_len = 0; 61#endif 62 63#endif /* HAVE_SETPROCTITLE */ 64 65void 66compat_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 119void 120setproctitle(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