annotate scpmisc.c @ 1853:2be3115a8762 default tip main master

debugging test runner authorized_keys perms
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Oct 2021 13:45:59 +0800
parents 9579377b5f8b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Dropbear Note: This file is based on OpenSSH 4.3p2. Avoid unnecessary
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2 changes to simplify future updates */
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3
4
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4 /*
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5 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 /*RCSID("OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp ");*/
4
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29
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30 /* For xmalloc, xfree etc:
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31 * Author: Tatu Ylonen <[email protected]>
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32 * Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
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33 * All rights reserved
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34 * Versions of malloc and friends that check their results, and never return
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35 * failure (they call fatal if they encounter an error).
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36 *
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37 * As far as I am concerned, the code I have written for this software
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38 * can be used freely for any purpose. Any derived versions of this
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39 * software must be clearly marked as such, and if the derived work is
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40 * incompatible with the protocol description in the RFC file, it must be
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41 * called by a name other than "ssh" or "Secure Shell".
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42 */
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43
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44 /*RCSID("OpenBSD: xmalloc.c,v 1.16 2001/07/23 18:21:46 stevesk Exp ");*/
4
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45
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46 #define _GNU_SOURCE
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47 #include "includes.h"
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48 #include "scpmisc.h"
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49
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50 void *
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51 xmalloc(size_t size)
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52 {
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53 void *ptr;
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54
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55 if (size == 0) {
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56 fprintf(stderr, "xmalloc: zero size\n");
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57 exit(EXIT_FAILURE);
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58 }
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59 ptr = malloc(size);
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60 if (ptr == NULL) {
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61 fprintf(stderr, "xmalloc: out of memory (allocating %lu bytes)\n", (u_long) size);
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62 exit(EXIT_FAILURE);
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63 }
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64 return ptr;
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65 }
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66
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67 void *
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68 xrealloc(void *ptr, size_t new_size)
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69 {
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70 void *new_ptr;
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71
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72 if (new_size == 0) {
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73 fprintf(stderr, "xrealloc: zero size\n");
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74 exit(EXIT_FAILURE);
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75 }
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76 if (ptr == NULL)
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77 new_ptr = malloc(new_size);
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78 else
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79 new_ptr = realloc(ptr, new_size);
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80 if (new_ptr == NULL) {
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81 fprintf(stderr, "xrealloc: out of memory (new_size %lu bytes)\n", (u_long) new_size);
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82 exit(EXIT_FAILURE);
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83 }
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84 return new_ptr;
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85 }
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86
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87 void
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88 xfree(void *ptr)
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89 {
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90 if (ptr == NULL) {
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91 fprintf(stderr, "xfree: NULL pointer given as argument\n");
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92 exit(EXIT_FAILURE);
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93 }
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94 free(ptr);
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95 }
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96
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97 char *
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98 xstrdup(const char *str)
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99 {
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100 size_t len;
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101 char *cp;
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102
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103 len = strlen(str) + 1;
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104 cp = xmalloc(len);
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105 strlcpy(cp, str, len);
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106 return cp;
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107 }
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108
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109 char *
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110 cleanhostname(char *host)
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111 {
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112 if (*host == '[' && host[strlen(host) - 1] == ']') {
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113 host[strlen(host) - 1] = '\0';
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114 return (host + 1);
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115 } else
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116 return host;
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117 }
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118
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119 char *
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120 colon(char *cp)
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121 {
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122 int flag = 0;
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123
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124 if (*cp == ':') /* Leading colon is part of file name. */
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125 return (0);
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126 if (*cp == '[')
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127 flag = 1;
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128
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129 for (; *cp; ++cp) {
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130 if (*cp == '@' && *(cp+1) == '[')
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131 flag = 1;
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132 if (*cp == ']' && *(cp+1) == ':' && flag)
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133 return (cp+1);
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134 if (*cp == ':' && !flag)
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135 return (cp);
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136 if (*cp == '/')
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137 return (0);
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138 }
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139 return (0);
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140 }
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141
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142 /* function to assist building execv() arguments */
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143 void
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144 addargs(arglist *args, char *fmt, ...)
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145 {
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146 va_list ap;
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147 char *cp;
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148 u_int nalloc;
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149 int r;
4
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150
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151 va_start(ap, fmt);
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152 r = vasprintf(&cp, fmt, ap);
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153 va_end(ap);
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154 if (r == -1)
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155 fatal("addargs: argument too long");
4
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parents:
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156
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diff changeset
157 nalloc = args->nalloc;
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parents:
diff changeset
158 if (args->list == NULL) {
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diff changeset
159 nalloc = 32;
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parents:
diff changeset
160 args->num = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 } else if (args->num+2 >= nalloc)
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parents:
diff changeset
162 nalloc *= 2;
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parents:
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163
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164 args->list = xrealloc(args->list, nalloc * sizeof(char *));
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165 args->nalloc = nalloc;
287
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parents: 38
diff changeset
166 args->list[args->num++] = cp;
4
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167 args->list[args->num] = NULL;
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parents:
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168 }
287
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169
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parents: 38
diff changeset
170 void
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diff changeset
171 replacearg(arglist *args, u_int which, char *fmt, ...)
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parents: 38
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172 {
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parents: 38
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173 va_list ap;
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parents: 38
diff changeset
174 char *cp;
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parents: 38
diff changeset
175 int r;
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176
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177 va_start(ap, fmt);
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178 r = vasprintf(&cp, fmt, ap);
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179 va_end(ap);
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180 if (r == -1)
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parents: 38
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181 fatal("replacearg: argument too long");
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182
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183 if (which >= args->num)
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184 fatal("replacearg: tried to replace invalid arg %d >= %d",
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parents: 38
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185 which, args->num);
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186 xfree(args->list[which]);
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diff changeset
187 args->list[which] = cp;
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188 }
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189
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parents: 38
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190 void
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191 freeargs(arglist *args)
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192 {
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193 u_int i;
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194
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parents: 38
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195 if (args->list != NULL) {
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diff changeset
196 for (i = 0; i < args->num; i++)
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197 xfree(args->list[i]);
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198 xfree(args->list);
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199 args->nalloc = args->num = 0;
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200 args->list = NULL;
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parents: 38
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201 }
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parents: 38
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202 }
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203
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parents: 38
diff changeset
204 /*
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205 * NB. duplicate __progname in case it is an alias for argv[0]
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206 * Otherwise it may get clobbered by setproctitle()
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diff changeset
207 */
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parents: 38
diff changeset
208 char *ssh_get_progname(char *argv0)
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parents: 38
diff changeset
209 {
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parents: 38
diff changeset
210 char *p;
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parents: 38
diff changeset
211
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parents: 38
diff changeset
212 if (argv0 == NULL)
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parents: 38
diff changeset
213 return ("unknown"); /* XXX */
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parents: 38
diff changeset
214 p = strrchr(argv0, '/');
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parents: 38
diff changeset
215 if (p == NULL)
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parents: 38
diff changeset
216 p = argv0;
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parents: 38
diff changeset
217 else
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parents: 38
diff changeset
218 p++;
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parents: 38
diff changeset
219
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parents: 38
diff changeset
220 return (xstrdup(p));
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parents: 38
diff changeset
221 }
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parents: 38
diff changeset
222
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parents: 38
diff changeset
223 void fatal(char* fmt,...)
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parents: 38
diff changeset
224 {
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parents: 38
diff changeset
225 va_list args;
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diff changeset
226 va_start(args, fmt);
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diff changeset
227 vfprintf(stderr, fmt, args);
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parents: 38
diff changeset
228 va_end(args);
1227
5dde22e8a189 scp: Have `fatal()' append a newline to the message
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parents: 1226
diff changeset
229 fputc('\n', stderr);
287
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parents: 38
diff changeset
230 exit(255);
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parents: 38
diff changeset
231 }
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parents: 38
diff changeset
232
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diff changeset
233 void
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parents: 38
diff changeset
234 sanitise_stdfd(void)
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parents: 38
diff changeset
235 {
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parents: 38
diff changeset
236 int nullfd, dupfd;
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parents: 38
diff changeset
237
1387
e7f11ed5fe28 Use DROPBEAR_PATH_DEVNULL instead of undefined _PATH_DEVNULL
Ben Gardner <bgardner@wabtec.com>
parents: 1227
diff changeset
238 if ((nullfd = dupfd = open(DROPBEAR_PATH_DEVNULL, O_RDWR)) == -1) {
287
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
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parents: 38
diff changeset
239 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
240 exit(1);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
241 }
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
242 while (++dupfd <= 2) {
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
243 /* Only clobber closed fds */
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parents: 38
diff changeset
244 if (fcntl(dupfd, F_GETFL, 0) >= 0)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
245 continue;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
246 if (dup2(nullfd, dupfd) == -1) {
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
247 fprintf(stderr, "dup2: %s", strerror(errno));
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
248 exit(1);
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
249 }
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
250 }
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
251 if (nullfd > 2)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
252 close(nullfd);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
253 }