annotate cli-runopts.c @ 47:4b53a43f0082

- client pubkey auth works - rearrange the runopts code for client and server (hostkey reading is needed by both (if the client is doing pubkey auth. otherwise....))
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 Aug 2004 16:18:01 +0000
parents 3bea78e1b175
children 6f091656c100
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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 #include "includes.h"
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26 #include "runopts.h"
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27 #include "signkey.h"
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28 #include "buffer.h"
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29 #include "dbutil.h"
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30 #include "algo.h"
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31
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32 cli_runopts cli_opts; /* GLOBAL */
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33
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34 static void printhelp();
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35 static void parsehostname(char* userhostarg);
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36 #ifdef DROPBEAR_PUBKEY_AUTH
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37 static void loadidentityfile(const char* filename);
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38 #endif
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39
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40 static void printhelp() {
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41
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42 fprintf(stderr, "Dropbear client v%s\n"
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43 "Usage: %s [options] user@host\n"
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44 "Options are:\n"
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45 "-p <remoteport>\n"
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46 "-t Allocate a pty"
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47 "-T Don't allocate a pty"
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48 #ifdef DROPBEAR_PUBKEY_AUTH
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49 "-i <identityfile> (multiple allowed)"
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50 #endif
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51 ,DROPBEAR_VERSION, cli_opts.progname);
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52 }
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53
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54 void cli_getopts(int argc, char ** argv) {
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55
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56 unsigned int i, j;
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57 char ** next = 0;
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58 unsigned int cmdlen;
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59 #ifdef DROPBEAR_PUBKEY_AUTH
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60 int nextiskey = 0; /* A flag if the next argument is a keyfile */
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61 #endif
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62
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63
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64
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65 /* see printhelp() for options */
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66 cli_opts.progname = argv[0];
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67 cli_opts.remotehost = NULL;
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68 cli_opts.remoteport = NULL;
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69 cli_opts.username = NULL;
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70 cli_opts.cmd = NULL;
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71 cli_opts.wantpty = 9; /* 9 means "it hasn't been touched", gets set later */
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72 #ifdef DROPBEAR_PUBKEY_AUTH
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73 cli_opts.pubkeys = NULL;
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74 #endif
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75 opts.nolocaltcp = 0;
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76 opts.noremotetcp = 0;
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77 /* not yet
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78 opts.ipv4 = 1;
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79 opts.ipv6 = 1;
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80 */
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81
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82 /* Iterate all the arguments */
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83 for (i = 1; i < (unsigned int)argc; i++) {
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84 #ifdef DROPBEAR_PUBKEY_AUTH
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85 if (nextiskey) {
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86 /* Load a hostkey since the previous argument was "-i" */
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87 loadidentityfile(argv[i]);
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88 nextiskey = 0;
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89 continue;
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90 }
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91 #endif
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92 if (next) {
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93 /* The previous flag set a value to assign */
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94 *next = argv[i];
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95 if (*next == NULL) {
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96 dropbear_exit("Invalid null argument");
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97 }
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98 next = NULL;
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99 continue;
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100 }
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101
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102 if (argv[i][0] == '-') {
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103 /* A flag *waves* */
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104
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105 switch (argv[i][1]) {
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106 case 'p': /* remoteport */
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107 next = &cli_opts.remoteport;
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108 break;
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109 #ifdef DROPBEAR_PUBKEY_AUTH
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110 case 'i': /* an identityfile */
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111 nextiskey = 1;
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112 break;
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113 #endif
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114 case 't': /* we want a pty */
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115 cli_opts.wantpty = 1;
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116 break;
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117 case 'T': /* don't want a pty */
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118 cli_opts.wantpty = 0;
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119 break;
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120 default:
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121 fprintf(stderr, "Unknown argument '%s'\n", argv[i]);
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122 printhelp();
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123 exit(EXIT_FAILURE);
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124 break;
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125 } /* Switch */
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126
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127 continue; /* next argument */
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128
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129 } else {
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130 TRACE(("non-flag arg"));
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131
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132 /* Either the hostname or commands */
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133
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134 if (cli_opts.remotehost == NULL) {
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135
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136 parsehostname(argv[i]);
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137
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138 } else {
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139
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140 /* this is part of the commands to send - after this we
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141 * don't parse any more options, and flags are sent as the
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142 * command */
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143 cmdlen = 0;
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144 for (j = i; j < (unsigned int)argc; j++) {
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145 cmdlen += strlen(argv[j]) + 1; /* +1 for spaces */
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146 }
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147 /* Allocate the space */
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148 cli_opts.cmd = (char*)m_malloc(cmdlen);
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149 cli_opts.cmd[0] = '\0';
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150
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151 /* Append all the bits */
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152 for (j = i; j < (unsigned int)argc; j++) {
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153 strlcat(cli_opts.cmd, argv[j], cmdlen);
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154 strlcat(cli_opts.cmd, " ", cmdlen);
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155 }
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156 /* It'll be null-terminated here */
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157
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158 /* We've eaten all the options and flags */
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159 break;
39
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160 }
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161 }
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162 }
47
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163
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164 if (cli_opts.remotehost == NULL) {
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165 dropbear_exit("Bad syntax");
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166 }
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167
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168 if (cli_opts.remoteport == NULL) {
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169 cli_opts.remoteport = "22";
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170 }
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171
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172 /* If not explicitly specified with -t or -T, we don't want a pty if
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173 * there's a command, but we do otherwise */
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174 if (cli_opts.wantpty == 9) {
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175 if (cli_opts.cmd == NULL) {
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176 cli_opts.wantpty = 1;
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177 } else {
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178 cli_opts.wantpty = 0;
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179 }
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180 }
39
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181 }
47
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182
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183 #ifdef DROPBEAR_PUBKEY_AUTH
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184 static void loadidentityfile(const char* filename) {
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185
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186 struct PubkeyList * nextkey;
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187 sign_key *key;
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188 int keytype;
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189
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190 key = new_sign_key();
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191 keytype = DROPBEAR_SIGNKEY_ANY;
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192 if ( readhostkey(filename, key, &keytype) != DROPBEAR_SUCCESS ) {
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193
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194 fprintf(stderr, "Failed loading keyfile '%s'\n", filename);
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195 sign_key_free(key);
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196
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197 } else {
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198
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199 nextkey = (struct PubkeyList*)m_malloc(sizeof(struct PubkeyList));
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200 nextkey->key = key;
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201 nextkey->next = cli_opts.pubkeys;
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202 nextkey->type = keytype;
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203 cli_opts.pubkeys = nextkey;
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204 }
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205 }
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206 #endif
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207
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208
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209 /* Parses a [user@]hostname argument. userhostarg is the argv[i] corresponding
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210 * - note that it will be modified */
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211 static void parsehostname(char* userhostarg) {
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212
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213 uid_t uid;
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214 struct passwd *pw = NULL;
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215
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216 cli_opts.remotehost = strchr(userhostarg, '@');
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217 if (cli_opts.remotehost == NULL) {
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218 /* no username portion, the cli-auth.c code can figure the
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219 * local user's name */
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220 cli_opts.remotehost = userhostarg;
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221 } else {
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222 cli_opts.remotehost[0] = '\0'; /* Split the user/host */
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223 cli_opts.remotehost++;
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224 cli_opts.username = userhostarg;
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225 }
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226
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227 if (cli_opts.username == NULL) {
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228 uid = getuid();
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229
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230 pw = getpwuid(uid);
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231 if (pw == NULL || pw->pw_name == NULL) {
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232 dropbear_exit("Unknown own user");
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233 }
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234
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235 cli_opts.username = m_strdup(pw->pw_name);
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236 }
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237
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238 if (cli_opts.remotehost[0] == '\0') {
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diff changeset
239 dropbear_exit("Bad hostname");
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240 }
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241 }