annotate scpmisc.c @ 865:39d872718d4b

Try and fix utmp handling
author Matt Johnston <matt@ucc.asn.au>
date Mon, 25 Nov 2013 23:30:01 +0800
parents 49f68a7b7a55
children 952624727411
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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
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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 #define _GNU_SOURCE
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44 #include "includes.h"
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45 #include "scpmisc.h"
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46
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47 void *
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48 xmalloc(size_t size)
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49 {
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50 void *ptr;
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51
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52 if (size == 0) {
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53 fprintf(stderr, "xmalloc: zero size\n");
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54 exit(EXIT_FAILURE);
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55 }
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56 ptr = malloc(size);
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57 if (ptr == NULL) {
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58 fprintf(stderr, "xmalloc: out of memory (allocating %lu bytes)\n", (u_long) size);
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59 exit(EXIT_FAILURE);
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60 }
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61 return ptr;
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62 }
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63
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64 void *
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65 xrealloc(void *ptr, size_t new_size)
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66 {
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67 void *new_ptr;
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68
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69 if (new_size == 0) {
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70 fprintf(stderr, "xrealloc: zero size\n");
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71 exit(EXIT_FAILURE);
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72 }
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73 if (ptr == NULL)
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74 new_ptr = malloc(new_size);
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75 else
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76 new_ptr = realloc(ptr, new_size);
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77 if (new_ptr == NULL) {
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78 fprintf(stderr, "xrealloc: out of memory (new_size %lu bytes)\n", (u_long) new_size);
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79 exit(EXIT_FAILURE);
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80 }
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81 return new_ptr;
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82 }
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83
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84 void
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85 xfree(void *ptr)
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86 {
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87 if (ptr == NULL) {
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88 fprintf(stderr, "xfree: NULL pointer given as argument\n");
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89 exit(EXIT_FAILURE);
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90 }
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91 free(ptr);
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92 }
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93
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94 char *
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95 xstrdup(const char *str)
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96 {
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97 size_t len;
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98 char *cp;
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99
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100 len = strlen(str) + 1;
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101 cp = xmalloc(len);
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102 strncpy(cp, str, len);
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103 return cp;
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104 }
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105
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106 char *
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107 cleanhostname(char *host)
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108 {
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109 if (*host == '[' && host[strlen(host) - 1] == ']') {
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110 host[strlen(host) - 1] = '\0';
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111 return (host + 1);
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112 } else
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113 return host;
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114 }
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115
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116 char *
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117 colon(char *cp)
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118 {
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119 int flag = 0;
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120
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121 if (*cp == ':') /* Leading colon is part of file name. */
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122 return (0);
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123 if (*cp == '[')
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124 flag = 1;
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125
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126 for (; *cp; ++cp) {
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127 if (*cp == '@' && *(cp+1) == '[')
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128 flag = 1;
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129 if (*cp == ']' && *(cp+1) == ':' && flag)
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130 return (cp+1);
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131 if (*cp == ':' && !flag)
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132 return (cp);
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133 if (*cp == '/')
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134 return (0);
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135 }
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136 return (0);
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137 }
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138
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139 /* function to assist building execv() arguments */
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140 void
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141 addargs(arglist *args, char *fmt, ...)
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142 {
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143 va_list ap;
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144 char *cp;
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145 u_int nalloc;
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146 int r;
4
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147
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148 va_start(ap, fmt);
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149 r = vasprintf(&cp, fmt, ap);
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150 va_end(ap);
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151 if (r == -1)
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152 fatal("addargs: argument too long");
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153
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154 nalloc = args->nalloc;
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155 if (args->list == NULL) {
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156 nalloc = 32;
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157 args->num = 0;
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158 } else if (args->num+2 >= nalloc)
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159 nalloc *= 2;
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160
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161 args->list = xrealloc(args->list, nalloc * sizeof(char *));
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162 args->nalloc = nalloc;
287
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163 args->list[args->num++] = cp;
4
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164 args->list[args->num] = NULL;
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165 }
287
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166
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167 void
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168 replacearg(arglist *args, u_int which, char *fmt, ...)
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169 {
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170 va_list ap;
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171 char *cp;
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172 int r;
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173
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174 va_start(ap, fmt);
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175 r = vasprintf(&cp, fmt, ap);
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176 va_end(ap);
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177 if (r == -1)
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178 fatal("replacearg: argument too long");
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179
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180 if (which >= args->num)
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181 fatal("replacearg: tried to replace invalid arg %d >= %d",
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182 which, args->num);
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183 xfree(args->list[which]);
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184 args->list[which] = cp;
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185 }
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186
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187 void
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188 freeargs(arglist *args)
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189 {
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190 u_int i;
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191
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192 if (args->list != NULL) {
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193 for (i = 0; i < args->num; i++)
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194 xfree(args->list[i]);
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195 xfree(args->list);
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196 args->nalloc = args->num = 0;
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197 args->list = NULL;
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198 }
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199 }
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200
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201 /*
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202 * NB. duplicate __progname in case it is an alias for argv[0]
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203 * Otherwise it may get clobbered by setproctitle()
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204 */
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205 char *ssh_get_progname(char *argv0)
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206 {
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207 char *p;
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208
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diff changeset
209 if (argv0 == NULL)
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210 return ("unknown"); /* XXX */
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211 p = strrchr(argv0, '/');
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diff changeset
212 if (p == NULL)
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213 p = argv0;
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214 else
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215 p++;
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216
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217 return (xstrdup(p));
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218 }
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219
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220 void fatal(char* fmt,...)
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221 {
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222 va_list args;
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223 va_start(args, fmt);
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224 vfprintf(stderr, fmt, args);
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diff changeset
225 va_end(args);
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diff changeset
226 exit(255);
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diff changeset
227 }
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228
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diff changeset
229 void
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diff changeset
230 sanitise_stdfd(void)
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diff changeset
231 {
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diff changeset
232 int nullfd, dupfd;
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diff changeset
233
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234 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
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235 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
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diff changeset
236 exit(1);
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diff changeset
237 }
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diff changeset
238 while (++dupfd <= 2) {
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diff changeset
239 /* Only clobber closed fds */
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diff changeset
240 if (fcntl(dupfd, F_GETFL, 0) >= 0)
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diff changeset
241 continue;
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diff changeset
242 if (dup2(nullfd, dupfd) == -1) {
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diff changeset
243 fprintf(stderr, "dup2: %s", strerror(errno));
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diff changeset
244 exit(1);
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parents: 38
diff changeset
245 }
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diff changeset
246 }
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parents: 38
diff changeset
247 if (nullfd > 2)
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diff changeset
248 close(nullfd);
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diff changeset
249 }