Mercurial > dropbear

annotate dbutil.c @ 10:0f7d69d31b9d

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- renaming x11fwd.c to svr-x11fwd.c, to testing monotone
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jun 2004 17:15:02 +0000
parents fe6bca95afa7
children f76c9389e9e0
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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 #include "includes.h"
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52 #include "dbutil.h"
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53 #include "buffer.h"
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54 #include "session.h"
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55 #include "atomicio.h"
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56
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57 #define MAX_FMT 100
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58
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59 void (*_dropbear_exit)(int exitcode, const char* format, va_list param) = NULL;
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60 void (*_dropbear_log)(int priority, const char* format, va_list param) = NULL;
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61
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62 int usingsyslog = 0; /* set by runopts, but required externally to sessions */
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63 #ifndef DISABLE_SYSLOG
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64 void startsyslog() {
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65
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66 openlog(PROGNAME, LOG_PID, LOG_AUTHPRIV);
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67
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68 }
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69 #endif /* DISABLE_SYSLOG */
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70
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71 /* the "format" string must be <= 100 characters */
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72 void dropbear_close(const char* format, ...) {
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73
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74 va_list param;
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75
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76 va_start(param, format);
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77 _dropbear_exit(EXIT_SUCCESS, format, param);
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78 va_end(param);
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79
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80 }
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81
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82 void dropbear_exit(const char* format, ...) {
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83
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84 va_list param;
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85
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86 va_start(param, format);
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87 _dropbear_exit(EXIT_FAILURE, format, param);
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88 va_end(param);
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89 }
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90
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91
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92 /* this is what can be called to write arbitrary log messages */
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93 void dropbear_log(int priority, const char* format, ...) {
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94
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95 va_list param;
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96
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97 va_start(param, format);
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98 _dropbear_log(priority, format, param);
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99 va_end(param);
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100 }
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101
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102
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103 #ifdef DEBUG_TRACE
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104 void dropbear_trace(const char* format, ...) {
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105
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106 va_list param;
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107
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108 va_start(param, format);
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109 fprintf(stderr, "TRACE: ");
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110 vfprintf(stderr, format, param);
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111 fprintf(stderr, "\n");
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112 va_end(param);
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113 }
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114 #endif /* DEBUG_TRACE */
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115
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116 /* Return a string representation of the socket address passed. The return
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117 * value is allocated with malloc() */
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118 unsigned char * getaddrstring(struct sockaddr * addr) {
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119
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120 char *retstring;
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121
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122 /* space for "255.255.255.255:65535\0" = 22 */
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123 retstring = m_malloc(22);
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124
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125 switch (addr->sa_family) {
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126 case PF_INET:
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127 snprintf(retstring, 22, "%s:%hu",
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128 inet_ntoa(((struct sockaddr_in *)addr)->sin_addr),
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129 ((struct sockaddr_in *)addr)->sin_port);
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130 break;
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131
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132 default:
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133 /* XXX ipv6 */
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134 strcpy(retstring, "Bad protocol");
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135
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136 }
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137 return retstring;
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138
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139 }
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140
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141 /* Get the hostname corresponding to the address addr. On failure, the IP
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142 * address is returned. The return value is allocated with strdup() */
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143 char* getaddrhostname(struct sockaddr * addr) {
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144
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145 struct hostent *host = NULL;
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146 char * retstring;
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147
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148 #ifdef DO_HOST_LOOKUP
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149 host = gethostbyaddr((char*)&((struct sockaddr_in*)addr)->sin_addr,
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150 sizeof(struct in_addr), AF_INET);
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151 #endif
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152
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153 if (host == NULL) {
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154 /* return the address */
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155 retstring = inet_ntoa(((struct sockaddr_in *)addr)->sin_addr);
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156 } else {
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157 /* return the hostname */
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158 retstring = host->h_name;
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159 }
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160
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161 return strdup(retstring);
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162 }
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163 #ifdef DEBUG_TRACE
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164 void printhex(unsigned char* buf, int len) {
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165
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166 int i;
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167
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168 for (i = 0; i < len; i++) {
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169 fprintf(stderr, "%02x", buf[i]);
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170 if (i % 16 == 15) {
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171 fprintf(stderr, "\n");
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172 }
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173 else if (i % 2 == 1) {
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174 fprintf(stderr, " ");
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175 }
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176 }
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177 fprintf(stderr, "\n");
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178 }
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179 #endif
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180
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181 /* Strip all control characters from text (a null-terminated string), except
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182 * for '\n', '\r' and '\t'.
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183 * The result returned is a newly allocated string, this must be free()d after
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184 * use */
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185 char * stripcontrol(const char * text) {
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186
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187 char * ret;
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188 int len, pos;
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189 int i;
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190
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191 len = strlen(text);
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192 ret = m_malloc(len+1);
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193
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194 pos = 0;
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195 for (i = 0; i < len; i++) {
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196 if ((text[i] <= '~' && text[i] >= ' ') /* normal printable range */
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197 || text[i] == '\n' || text[i] == '\r' || text[i] == '\t') {
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198 ret[pos] = text[i];
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199 pos++;
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200 }
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201 }
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202 ret[pos] = 0x0;
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203 return ret;
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204 }
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205
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206
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207 /* reads the contents of filename into the buffer buf, from the current
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208 * position, either to the end of the file, or the buffer being full.
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209 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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210 int buf_readfile(buffer* buf, const char* filename) {
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211
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212 int fd;
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213 int len;
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214 int maxlen;
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215
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216 fd = open(filename, O_RDONLY);
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217
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218 if (fd < 0) {
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219 close(fd);
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220 return DROPBEAR_FAILURE;
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221 }
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222
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223 do {
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224 maxlen = buf->size - buf->pos;
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225 len = read(fd, buf_getwriteptr(buf, maxlen),
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226 maxlen);
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227 buf_incrwritepos(buf, len);
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228 } while (len < maxlen && len > 0);
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229
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230 close(fd);
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231 return DROPBEAR_SUCCESS;
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232 }
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233
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234 /* loop until the socket is closed (in case of EINTR) or
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235 * we get and error.
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236 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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237 int m_close(int fd) {
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238
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239 int val;
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240 do {
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241 val = close(fd);
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242 } while (val < 0 && errno == EINTR);
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243
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244 if (val == 0 || errno == EBADF) {
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245 return DROPBEAR_SUCCESS;
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246 } else {
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247 return DROPBEAR_FAILURE;
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248 }
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249 }
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250
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251 void * m_malloc(size_t size) {
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252
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253 void* ret;
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254
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255 if (size == 0) {
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256 dropbear_exit("m_malloc failed");
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257 }
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258 ret = malloc(size);
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259 if (ret == NULL) {
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260 dropbear_exit("m_malloc failed");
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261 }
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262 return ret;
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263
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264 }
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265
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266 void __m_free(void* ptr) {
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267 if (ptr != NULL) {
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268 free(ptr);
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269 }
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270 }
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271
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272 void * m_realloc(void* ptr, size_t size) {
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273
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274 void *ret;
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275
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276 if (size == 0) {
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277 dropbear_exit("m_realloc failed");
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278 }
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279 ret = realloc(ptr, size);
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280 if (ret == NULL) {
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281 dropbear_exit("m_realloc failed");
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282 }
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283 return ret;
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284 }
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285
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286 /* Clear the data, based on the method in David Wheeler's
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287 * "Secure Programming for Linux and Unix HOWTO" */
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288 void m_burn(void *data, unsigned int len) {
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289 volatile char *p = data;
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290
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291 if (data == NULL)
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292 return;
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diff changeset
293 while (len--) {
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294 *p++ = 0x66;
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295 }
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296 }