882cdc116d
a NULL argument. Some programs change the contents of the argv array, typically to remove some special arguments. They shorten argv by storing a NULL where an argument pointer used to be. Such programs core dumped if they called setproctitle(), because it would try to apply strlen() to a NULL pointer.
159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/*
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* Copyright (c) 1995 Peter Wemm <peter@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* Peter Wemm.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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/*
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* Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and
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* in different locations.
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* 1: old_ps_strings at the very top of the stack.
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* 2: old_ps_strings at SPARE_USRSPACE below the top of the stack.
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* 3: ps_strings at the very top of the stack.
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* This attempts to support a kernel built in the #2 and #3 era.
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*/
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struct old_ps_strings {
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char *old_ps_argvstr;
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int old_ps_nargvstr;
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char *old_ps_envstr;
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int old_ps_nenvstr;
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};
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#define OLD_PS_STRINGS ((struct old_ps_strings *) \
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(USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings)))
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#include <stdarg.h>
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#define SPT_BUFSIZE 2048 /* from other parts of sendmail */
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extern char * __progname; /* is this defined in a .h anywhere? */
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void
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setproctitle(const char *fmt, ...)
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{
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static struct ps_strings *ps_strings;
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static char buf[SPT_BUFSIZE];
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static char obuf[SPT_BUFSIZE];
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static char **oargv, *kbuf;
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static int oargc = -1;
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static char *nargv[2] = { buf, NULL };
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char **nargvp;
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int nargc;
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int i;
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va_list ap;
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size_t len;
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unsigned long ul_ps_strings;
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int oid[4];
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va_start(ap, fmt);
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if (fmt) {
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buf[sizeof(buf) - 1] = '\0';
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if (fmt[0] == '-') {
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/* skip program name prefix */
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fmt++;
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len = 0;
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} else {
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/* print program name heading for grep */
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(void) snprintf(buf, sizeof(buf), "%s: ", __progname);
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len = strlen(buf);
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}
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/* print the argument string */
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(void) vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
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nargvp = nargv;
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nargc = 1;
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kbuf = buf;
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} else if (*obuf != '\0') {
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/* Idea from NetBSD - reset the title on fmt == NULL */
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nargvp = oargv;
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nargc = oargc;
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kbuf = obuf;
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} else
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/* Nothing to restore */
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return;
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va_end(ap);
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/* Set the title into the kernel cached command line */
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oid[0] = CTL_KERN;
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oid[1] = KERN_PROC;
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oid[2] = KERN_PROC_ARGS;
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oid[3] = getpid();
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sysctl(oid, 4, 0, 0, kbuf, strlen(kbuf) + 1);
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if (ps_strings == NULL) {
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len = sizeof(ul_ps_strings);
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if (sysctlbyname("kern.ps_strings", &ul_ps_strings, &len, NULL,
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0) == -1)
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ul_ps_strings = PS_STRINGS;
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ps_strings = (struct ps_strings *)ul_ps_strings;
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}
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/* PS_STRINGS points to zeroed memory on a style #2 kernel */
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if (ps_strings->ps_argvstr) {
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/* style #3 */
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if (oargc == -1) {
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/* Record our original args */
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oargc = ps_strings->ps_nargvstr;
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oargv = ps_strings->ps_argvstr;
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for (i = len = 0; i < oargc; i++) {
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/*
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* The program may have scribbled into its
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* argv array, e.g., to remove some arguments.
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* If that has happened, break out before
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* trying to call strlen on a NULL pointer.
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*/
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if (oargv[i] == NULL) {
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oargc = i;
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break;
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}
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snprintf(obuf + len, sizeof(obuf) - len, "%s%s",
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len ? " " : "", oargv[i]);
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if (len)
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len++;
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len += strlen(oargv[i]);
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if (len >= sizeof(obuf))
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break;
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}
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}
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ps_strings->ps_nargvstr = nargc;
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ps_strings->ps_argvstr = nargvp;
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} else {
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/* style #2 - we can only restore our first arg :-( */
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if (*obuf == '\0')
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strncpy(obuf, OLD_PS_STRINGS->old_ps_argvstr,
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sizeof(obuf) - 1);
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OLD_PS_STRINGS->old_ps_nargvstr = 1;
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OLD_PS_STRINGS->old_ps_argvstr = nargvp[0];
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}
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}
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