crypto/openssh-3.8.1p1/openbsd-compat/setproctitle.c

   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 <unistd.h>
  39 #ifdef HAVE_SYS_PSTAT_H
  40 #include <sys/pstat.h>
  41 #endif
  42
  43 #define SPT_NONE        0       /* don't use it at all */
  44 #define SPT_PSTAT       1       /* use pstat(PSTAT_SETCMD, ...) */
  45 #define SPT_REUSEARGV   2       /* cover argv with title information */
  46
  47 #ifndef SPT_TYPE
  48 # define SPT_TYPE       SPT_NONE
  49 #endif
  50
  51 #ifndef SPT_PADCHAR
  52 # define SPT_PADCHAR    '\0'
  53 #endif
  54
  55 #if SPT_TYPE == SPT_REUSEARGV
  56 static char *argv_start = NULL;
  57 static size_t argv_env_len = 0;
  58 #endif
  59
  60 #endif /* HAVE_SETPROCTITLE */
  61
  62 void
  63 compat_init_setproctitle(int argc, char *argv[])
  64 {
  65 #if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
  66         extern char **environ;
  67         char *lastargv = NULL;
  68         char **envp = environ;
  69         int i;
  70
  71         /*
  72          * NB: This assumes that argv has already been copied out of the
  73          * way. This is true for sshd, but may not be true for other
  74          * programs. Beware.
  75          */
  76
  77         if (argc == 0 || argv[0] == NULL)
  78                 return;
  79
  80         /* Fail if we can't allocate room for the new environment */
  81         for (i = 0; envp[i] != NULL; i++)
  82                 ;
  83         if ((environ = malloc(sizeof(*environ) * (i + 1))) == NULL) {
  84                 environ = envp; /* put it back */
  85                 return;
  86         }
  87
  88         /*
  89          * Find the last argv string or environment variable within
  90          * our process memory area.
  91          */
  92         for (i = 0; i < argc; i++) {
  93                 if (lastargv == NULL || lastargv + 1 == argv[i])
  94                         lastargv = argv[i] + strlen(argv[i]);
  95         }
  96         for (i = 0; envp[i] != NULL; i++) {
  97                 if (lastargv + 1 == envp[i])
  98                         lastargv = envp[i] + strlen(envp[i]);
  99         }
 100
 101         argv[1] = NULL;
 102         argv_start = argv[0];
 103         argv_env_len = lastargv - argv[0] - 1;
 104
 105         /*
 106          * Copy environment
 107          * XXX - will truncate env on strdup fail
 108          */
 109         for (i = 0; envp[i] != NULL; i++)
 110                 environ[i] = strdup(envp[i]);
 111         environ[i] = NULL;
 112 #endif /* SPT_REUSEARGV */
 113 }
 114
 115 #ifndef HAVE_SETPROCTITLE
 116 void
 117 setproctitle(const char *fmt, ...)
 118 {
 119 #if SPT_TYPE != SPT_NONE
 120         va_list ap;
 121         char buf[1024];
 122         size_t len;
 123         extern char *__progname;
 124 #if SPT_TYPE == SPT_PSTAT
 125         union pstun pst;
 126 #endif
 127
 128 #if SPT_TYPE == SPT_REUSEARGV
 129         if (argv_env_len <= 0)
 130                 return;
 131 #endif
 132
 133         strlcpy(buf, __progname, sizeof(buf));
 134
 135         va_start(ap, fmt);
 136         if (fmt != NULL) {
 137                 len = strlcat(buf, ": ", sizeof(buf));
 138                 if (len < sizeof(buf))
 139                         vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
 140         }
 141         va_end(ap);
 142
 143 #if SPT_TYPE == SPT_PSTAT
 144         pst.pst_command = buf;
 145         pstat(PSTAT_SETCMD, pst, strlen(buf), 0, 0);
 146 #elif SPT_TYPE == SPT_REUSEARGV
 147 /*      debug("setproctitle: copy \"%s\" into len %d",
 148             buf, argv_env_len); */
 149         len = strlcpy(argv_start, buf, argv_env_len);
 150         for(; len < argv_env_len; len++)
 151                 argv_start[len] = SPT_PADCHAR;
 152 #endif
 153
 154 #endif /* SPT_NONE */
 155 }
 156
 157 #endif /* HAVE_SETPROCTITLE */