annotate scpmisc.c @ 669:a8367733e8cd

Slight formatting change for ENABLE_CLI_AGENTFWD if statement
author Matt Johnston <matt@ucc.asn.au>
date Mon, 09 Apr 2012 21:29:41 +0800
parents b72f98803e46
children 973fccb59ea4 49f68a7b7a55
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions
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6 * are met:
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7 * 1. Redistributions of source code must retain the above copyright
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8 * notice, this list of conditions and the following disclaimer.
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9 * 2. Redistributions in binary form must reproduce the above copyright
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10 * notice, this list of conditions and the following disclaimer in the
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11 * documentation and/or other materials provided with the distribution.
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12 *
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13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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23 */
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24
38
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25 /*RCSID("OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp ");*/
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26
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27 /* For xmalloc, xfree etc:
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28 * Author: Tatu Ylonen <[email protected]>
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29 * Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
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30 * All rights reserved
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31 * Versions of malloc and friends that check their results, and never return
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32 * failure (they call fatal if they encounter an error).
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33 *
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34 * As far as I am concerned, the code I have written for this software
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35 * can be used freely for any purpose. Any derived versions of this
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36 * software must be clearly marked as such, and if the derived work is
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37 * incompatible with the protocol description in the RFC file, it must be
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38 * called by a name other than "ssh" or "Secure Shell".
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39 */
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40
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41 /*RCSID("OpenBSD: xmalloc.c,v 1.16 2001/07/23 18:21:46 stevesk Exp ");*/
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42
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43 #include "includes.h"
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44 #include "scpmisc.h"
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45
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46 void *
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47 xmalloc(size_t size)
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48 {
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49 void *ptr;
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50
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51 if (size == 0) {
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52 fprintf(stderr, "xmalloc: zero size\n");
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53 exit(EXIT_FAILURE);
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54 }
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55 ptr = malloc(size);
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56 if (ptr == NULL) {
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57 fprintf(stderr, "xmalloc: out of memory (allocating %lu bytes)\n", (u_long) size);
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58 exit(EXIT_FAILURE);
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59 }
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60 return ptr;
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61 }
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62
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63 void *
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64 xrealloc(void *ptr, size_t new_size)
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65 {
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66 void *new_ptr;
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67
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68 if (new_size == 0) {
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69 fprintf(stderr, "xrealloc: zero size\n");
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70 exit(EXIT_FAILURE);
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71 }
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72 if (ptr == NULL)
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73 new_ptr = malloc(new_size);
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74 else
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75 new_ptr = realloc(ptr, new_size);
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76 if (new_ptr == NULL) {
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77 fprintf(stderr, "xrealloc: out of memory (new_size %lu bytes)\n", (u_long) new_size);
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78 exit(EXIT_FAILURE);
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79 }
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80 return new_ptr;
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81 }
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82
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83 void
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84 xfree(void *ptr)
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85 {
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86 if (ptr == NULL) {
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87 fprintf(stderr, "xfree: NULL pointer given as argument\n");
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88 exit(EXIT_FAILURE);
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89 }
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90 free(ptr);
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91 }
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92
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93 char *
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94 xstrdup(const char *str)
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95 {
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96 size_t len;
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97 char *cp;
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98
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99 len = strlen(str) + 1;
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100 cp = xmalloc(len);
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101 strncpy(cp, str, len);
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102 return cp;
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103 }
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104
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105 char *
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106 cleanhostname(char *host)
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107 {
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108 if (*host == '[' && host[strlen(host) - 1] == ']') {
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109 host[strlen(host) - 1] = '\0';
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110 return (host + 1);
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111 } else
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112 return host;
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113 }
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114
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115 char *
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116 colon(char *cp)
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117 {
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118 int flag = 0;
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119
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120 if (*cp == ':') /* Leading colon is part of file name. */
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121 return (0);
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122 if (*cp == '[')
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123 flag = 1;
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124
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125 for (; *cp; ++cp) {
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126 if (*cp == '@' && *(cp+1) == '[')
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127 flag = 1;
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128 if (*cp == ']' && *(cp+1) == ':' && flag)
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129 return (cp+1);
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130 if (*cp == ':' && !flag)
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131 return (cp);
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132 if (*cp == '/')
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133 return (0);
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134 }
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135 return (0);
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136 }
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137
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138 /* function to assist building execv() arguments */
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139 void
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140 addargs(arglist *args, char *fmt, ...)
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141 {
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142 va_list ap;
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143 char *cp;
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144 u_int nalloc;
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145 int r;
4
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146
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147 va_start(ap, fmt);
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148 r = vasprintf(&cp, fmt, ap);
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149 va_end(ap);
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150 if (r == -1)
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151 fatal("addargs: argument too long");
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152
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153 nalloc = args->nalloc;
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154 if (args->list == NULL) {
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155 nalloc = 32;
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156 args->num = 0;
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157 } else if (args->num+2 >= nalloc)
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158 nalloc *= 2;
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159
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160 args->list = xrealloc(args->list, nalloc * sizeof(char *));
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161 args->nalloc = nalloc;
287
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162 args->list[args->num++] = cp;
4
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163 args->list[args->num] = NULL;
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164 }
287
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165
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166 void
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167 replacearg(arglist *args, u_int which, char *fmt, ...)
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168 {
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169 va_list ap;
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170 char *cp;
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171 int r;
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172
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173 va_start(ap, fmt);
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174 r = vasprintf(&cp, fmt, ap);
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175 va_end(ap);
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176 if (r == -1)
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177 fatal("replacearg: argument too long");
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178
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179 if (which >= args->num)
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180 fatal("replacearg: tried to replace invalid arg %d >= %d",
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181 which, args->num);
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182 xfree(args->list[which]);
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183 args->list[which] = cp;
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184 }
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185
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186 void
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187 freeargs(arglist *args)
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188 {
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189 u_int i;
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190
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191 if (args->list != NULL) {
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192 for (i = 0; i < args->num; i++)
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193 xfree(args->list[i]);
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194 xfree(args->list);
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195 args->nalloc = args->num = 0;
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196 args->list = NULL;
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197 }
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198 }
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199
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200 /*
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201 * NB. duplicate __progname in case it is an alias for argv[0]
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202 * Otherwise it may get clobbered by setproctitle()
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203 */
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204 char *ssh_get_progname(char *argv0)
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205 {
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206 char *p;
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207
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208 if (argv0 == NULL)
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209 return ("unknown"); /* XXX */
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210 p = strrchr(argv0, '/');
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211 if (p == NULL)
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212 p = argv0;
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213 else
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214 p++;
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215
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216 return (xstrdup(p));
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217 }
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218
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219 void fatal(char* fmt,...)
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220 {
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221 va_list args;
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222 va_start(args, fmt);
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223 vfprintf(stderr, fmt, args);
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224 va_end(args);
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225 exit(255);
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226 }
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227
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diff changeset
228 void
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diff changeset
229 sanitise_stdfd(void)
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230 {
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diff changeset
231 int nullfd, dupfd;
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diff changeset
232
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233 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
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234 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
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diff changeset
235 exit(1);
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diff changeset
236 }
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diff changeset
237 while (++dupfd <= 2) {
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diff changeset
238 /* Only clobber closed fds */
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diff changeset
239 if (fcntl(dupfd, F_GETFL, 0) >= 0)
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diff changeset
240 continue;
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diff changeset
241 if (dup2(nullfd, dupfd) == -1) {
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diff changeset
242 fprintf(stderr, "dup2: %s", strerror(errno));
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diff changeset
243 exit(1);
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diff changeset
244 }
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diff changeset
245 }
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diff changeset
246 if (nullfd > 2)
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diff changeset
247 close(nullfd);
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diff changeset
248 }