Mercurial > dropbear

annotate compat.c @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents caa09587c3fb
children a0062a354a80
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE.
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24 *
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25 * strlcat() is copyright as follows:
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26 * Copyright (c) 1998 Todd C. Miller <[email protected]>
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27 * All rights reserved.
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28 *
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29 * Redistribution and use in source and binary forms, with or without
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30 * modification, are permitted provided that the following conditions
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31 * are met:
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32 * 1. Redistributions of source code must retain the above copyright
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33 * notice, this list of conditions and the following disclaimer.
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34 * 2. Redistributions in binary form must reproduce the above copyright
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35 * notice, this list of conditions and the following disclaimer in the
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36 * documentation and/or other materials provided with the distribution.
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37 * 3. The name of the author may not be used to endorse or promote products
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38 * derived from this software without specific prior written permission.
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39 *
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40 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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41 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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42 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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43 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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44 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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45 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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46 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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47 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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49 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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50 *
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51 * daemon() and getusershell() is copyright as follows:
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52 *
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53 * Copyright (c) 1990, 1993
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54 * The Regents of the University of California. All rights reserved.
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55 *
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56 * Redistribution and use in source and binary forms, with or without
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57 * modification, are permitted provided that the following conditions
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58 * are met:
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59 * 1. Redistributions of source code must retain the above copyright
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60 * notice, this list of conditions and the following disclaimer.
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61 * 2. Redistributions in binary form must reproduce the above copyright
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62 * notice, this list of conditions and the following disclaimer in the
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63 * documentation and/or other materials provided with the distribution.
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64 * 3. Neither the name of the University nor the names of its contributors
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65 * may be used to endorse or promote products derived from this software
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66 * without specific prior written permission.
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67 *
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68 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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69 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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70 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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71 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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72 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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73 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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74 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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75 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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76 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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77 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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78 * SUCH DAMAGE.
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79 *
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80 * Modifications for Dropbear to getusershell() are by Paul Marinceu
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81 */
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82
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83 #include "includes.h"
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84
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85 #ifndef HAVE_GETUSERSHELL
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86 static char **curshell, **shells, *strings;
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87 static char **initshells();
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88 #endif
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89
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90 #ifndef HAVE_STRLCPY
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91 /* Implemented by matt as specified in freebsd 4.7 manpage.
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92 * We don't require great speed, is simply for use with sshpty code */
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93 size_t strlcpy(char *dst, const char *src, size_t size) {
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94
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95 size_t i;
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96
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97 /* this is undefined, though size==0 -> return 0 */
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98 if (size < 1) {
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99 return 0;
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100 }
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101
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102 for (i = 0; i < size-1; i++) {
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103 if (src[i] == '\0') {
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104 break;
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105 } else {
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106 dst[i] = src[i];
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107 }
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108 }
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109
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110 dst[i] = '\0';
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111 return strlen(src);
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112
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113 }
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114 #endif /* HAVE_STRLCPY */
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115
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116 #ifndef HAVE_STRLCAT
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117 /* taken from openbsd-compat for OpenSSH 3.6.1p1 */
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118 /* "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"
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119 *
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120 * Appends src to string dst of size siz (unlike strncat, siz is the
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121 * full size of dst, not space left). At most siz-1 characters
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122 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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123 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
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124 * If retval >= siz, truncation occurred.
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125 */
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126 size_t
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127 strlcat(dst, src, siz)
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128 char *dst;
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129 const char *src;
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130 size_t siz;
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131 {
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132 register char *d = dst;
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133 register const char *s = src;
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134 register size_t n = siz;
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135 size_t dlen;
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136
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137 /* Find the end of dst and adjust bytes left but don't go past end */
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138 while (n-- != 0 && *d != '\0')
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139 d++;
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140 dlen = d - dst;
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141 n = siz - dlen;
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142
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143 if (n == 0)
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144 return(dlen + strlen(s));
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145 while (*s != '\0') {
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146 if (n != 1) {
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147 *d++ = *s;
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148 n--;
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149 }
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150 s++;
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151 }
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152 *d = '\0';
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153
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154 return(dlen + (s - src)); /* count does not include NUL */
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155 }
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156 #endif /* HAVE_STRLCAT */
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157
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158 #ifndef HAVE_DAEMON
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159 /* From NetBSD - daemonise a process */
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160
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161 int daemon(int nochdir, int noclose) {
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162
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163 int fd;
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164
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165 switch (fork()) {
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166 case -1:
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167 return (-1);
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168 case 0:
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169 break;
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170 default:
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171 _exit(0);
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172 }
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173
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174 if (setsid() == -1)
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175 return -1;
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176
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177 if (!nochdir)
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178 (void)chdir("/");
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179
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180 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
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181 (void)dup2(fd, STDIN_FILENO);
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182 (void)dup2(fd, STDOUT_FILENO);
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183 (void)dup2(fd, STDERR_FILENO);
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184 if (fd > STDERR_FILENO)
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185 (void)close(fd);
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186 }
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187 return 0;
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188 }
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189 #endif /* HAVE_DAEMON */
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190
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191 #ifndef HAVE_BASENAME
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192
86
ace512d2ad5d Small fixes
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193 char *basename(const char *path) {
4
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194
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195 char *foo = strrchr(path, '/');
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196 if (!foo)
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197 {
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198 return path;
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199 }
4
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200 return ++foo;
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201 }
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202
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203 #endif /* HAVE_BASENAME */
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204
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205 #ifndef HAVE_GETUSERSHELL
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206
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207 /*
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208 * Get a list of shells from /etc/shells, if it exists.
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209 */
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210 char * getusershell() {
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211 char *ret;
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212
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213 if (curshell == NULL)
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214 curshell = initshells();
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215 ret = *curshell;
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216 if (ret != NULL)
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217 curshell++;
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218 return (ret);
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219 }
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220
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221 void endusershell() {
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222
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223 if (shells != NULL)
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224 free(shells);
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225 shells = NULL;
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226 if (strings != NULL)
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227 free(strings);
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228 strings = NULL;
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229 curshell = NULL;
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230 }
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231
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232 void setusershell() {
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233 curshell = initshells();
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234 }
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235
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236 static char **initshells() {
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237 /* don't touch this list. */
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238 const char *okshells[] = { "/bin/sh", "/bin/csh", NULL };
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239 register char **sp, *cp;
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240 register FILE *fp;
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241 struct stat statb;
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242 int flen;
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243
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244 if (shells != NULL)
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245 free(shells);
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246 shells = NULL;
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247 if (strings != NULL)
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248 free(strings);
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249 strings = NULL;
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250 if ((fp = fopen("/etc/shells", "rc")) == NULL)
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251 return (char **) okshells;
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252 if (fstat(fileno(fp), &statb) == -1) {
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253 (void)fclose(fp);
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254 return (char **) okshells;
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255 }
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256 if ((strings = malloc((u_int)statb.st_size + 1)) == NULL) {
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257 (void)fclose(fp);
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258 return (char **) okshells;
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259 }
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260 shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
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261 if (shells == NULL) {
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262 (void)fclose(fp);
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263 free(strings);
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264 strings = NULL;
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265 return (char **) okshells;
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266 }
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267 sp = shells;
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268 cp = strings;
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269 flen = statb.st_size;
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270 while (fgets(cp, flen - (cp - strings), fp) != NULL) {
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271 while (*cp != '#' && *cp != '/' && *cp != '\0')
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272 cp++;
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273 if (*cp == '#' || *cp == '\0')
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274 continue;
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275 *sp++ = cp;
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276 while (!isspace(*cp) && *cp != '#' && *cp != '\0')
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277 cp++;
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278 *cp++ = '\0';
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279 }
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280 *sp = NULL;
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281 (void)fclose(fp);
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282 return (shells);
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283 }
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284
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285 #endif /* HAVE_GETUSERSHELL */