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254 lines
5.7 KiB
C
254 lines
5.7 KiB
C
/* Dropbear Note: This file is based on OpenSSH 4.3p2. Avoid unnecessary
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changes to simplify future updates */
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/*
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* Copyright (c) 2000 Markus Friedl. 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, are 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, 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*RCSID("OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp ");*/
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/* For xmalloc, xfree etc:
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Versions of malloc and friends that check their results, and never return
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* failure (they call fatal if they encounter an error).
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/*RCSID("OpenBSD: xmalloc.c,v 1.16 2001/07/23 18:21:46 stevesk Exp ");*/
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#define _GNU_SOURCE
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#include "includes.h"
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#include "scpmisc.h"
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void *
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xmalloc(size_t size)
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{
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void *ptr;
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if (size == 0) {
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fprintf(stderr, "xmalloc: zero size\n");
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exit(EXIT_FAILURE);
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}
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ptr = malloc(size);
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if (ptr == NULL) {
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fprintf(stderr, "xmalloc: out of memory (allocating %lu bytes)\n", (u_long) size);
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exit(EXIT_FAILURE);
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}
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return ptr;
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}
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void *
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xrealloc(void *ptr, size_t new_size)
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{
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void *new_ptr;
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if (new_size == 0) {
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fprintf(stderr, "xrealloc: zero size\n");
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exit(EXIT_FAILURE);
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}
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if (ptr == NULL)
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new_ptr = malloc(new_size);
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else
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new_ptr = realloc(ptr, new_size);
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if (new_ptr == NULL) {
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fprintf(stderr, "xrealloc: out of memory (new_size %lu bytes)\n", (u_long) new_size);
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exit(EXIT_FAILURE);
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}
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return new_ptr;
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}
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void
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xfree(void *ptr)
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{
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if (ptr == NULL) {
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fprintf(stderr, "xfree: NULL pointer given as argument\n");
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exit(EXIT_FAILURE);
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}
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free(ptr);
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}
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char *
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xstrdup(const char *str)
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{
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size_t len;
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char *cp;
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len = strlen(str) + 1;
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cp = xmalloc(len);
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strlcpy(cp, str, len);
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return cp;
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}
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char *
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cleanhostname(char *host)
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{
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if (*host == '[' && host[strlen(host) - 1] == ']') {
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host[strlen(host) - 1] = '\0';
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return (host + 1);
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} else
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return host;
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}
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char *
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colon(char *cp)
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{
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int flag = 0;
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if (*cp == ':') /* Leading colon is part of file name. */
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return (0);
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if (*cp == '[')
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flag = 1;
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for (; *cp; ++cp) {
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if (*cp == '@' && *(cp+1) == '[')
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flag = 1;
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if (*cp == ']' && *(cp+1) == ':' && flag)
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return (cp+1);
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if (*cp == ':' && !flag)
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return (cp);
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if (*cp == '/')
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return (0);
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}
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return (0);
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}
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/* function to assist building execv() arguments */
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void
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addargs(arglist *args, char *fmt, ...)
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{
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va_list ap;
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char *cp;
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u_int nalloc;
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int r;
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va_start(ap, fmt);
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r = vasprintf(&cp, fmt, ap);
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va_end(ap);
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if (r == -1)
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fatal("addargs: argument too long");
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nalloc = args->nalloc;
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if (args->list == NULL) {
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nalloc = 32;
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args->num = 0;
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} else if (args->num+2 >= nalloc)
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nalloc *= 2;
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args->list = xrealloc(args->list, nalloc * sizeof(char *));
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args->nalloc = nalloc;
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args->list[args->num++] = cp;
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args->list[args->num] = NULL;
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}
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void
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replacearg(arglist *args, u_int which, char *fmt, ...)
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{
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va_list ap;
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char *cp;
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int r;
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va_start(ap, fmt);
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r = vasprintf(&cp, fmt, ap);
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va_end(ap);
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if (r == -1)
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fatal("replacearg: argument too long");
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if (which >= args->num)
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fatal("replacearg: tried to replace invalid arg %d >= %d",
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which, args->num);
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xfree(args->list[which]);
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args->list[which] = cp;
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}
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void
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freeargs(arglist *args)
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{
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u_int i;
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if (args->list != NULL) {
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for (i = 0; i < args->num; i++)
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xfree(args->list[i]);
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xfree(args->list);
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args->nalloc = args->num = 0;
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args->list = NULL;
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}
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}
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/*
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* NB. duplicate __progname in case it is an alias for argv[0]
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* Otherwise it may get clobbered by setproctitle()
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*/
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char *ssh_get_progname(char *argv0)
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{
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char *p;
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if (argv0 == NULL)
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return ("unknown"); /* XXX */
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p = strrchr(argv0, '/');
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if (p == NULL)
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p = argv0;
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else
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p++;
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return (xstrdup(p));
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}
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void fatal(char* fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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vfprintf(stderr, fmt, args);
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va_end(args);
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fputc('\n', stderr);
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exit(255);
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}
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void
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sanitise_stdfd(void)
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{
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int nullfd, dupfd;
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if ((nullfd = dupfd = open(DROPBEAR_PATH_DEVNULL, O_RDWR)) == -1) {
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fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
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exit(1);
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}
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while (++dupfd <= 2) {
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/* Only clobber closed fds */
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if (fcntl(dupfd, F_GETFL, 0) >= 0)
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continue;
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if (dup2(nullfd, dupfd) == -1) {
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fprintf(stderr, "dup2: %s", strerror(errno));
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exit(1);
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}
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}
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if (nullfd > 2)
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close(nullfd);
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}
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