Mercurial > dropbear
annotate cli-runopts.c @ 481:357a2e2e9bcc
- Generalise spawn_command function
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 15 Sep 2008 13:41:18 +0000 |
parents | e3db1f7a2e43 |
children | 738313e73b1c |
rev | line source |
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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" |
64 | 31 #include "tcpfwd.h" |
39
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32 |
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33 cli_runopts cli_opts; /* GLOBAL */ |
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34 |
47 | 35 static void printhelp(); |
36 static void parsehostname(char* userhostarg); | |
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37 #ifdef ENABLE_CLI_PUBKEY_AUTH |
47 | 38 static void loadidentityfile(const char* filename); |
39 #endif | |
64 | 40 #ifdef ENABLE_CLI_ANYTCPFWD |
41 static void addforward(char* str, struct TCPFwdList** fwdlist); | |
42 #endif | |
39
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43 |
47 | 44 static void printhelp() { |
39
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45 |
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46 fprintf(stderr, "Dropbear client v%s\n" |
333
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47 "Usage: %s [options] [user@]host [command]\n" |
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48 "Options are:\n" |
47 | 49 "-p <remoteport>\n" |
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50 "-l <username>\n" |
56
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51 "-t Allocate a pty\n" |
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52 "-T Don't allocate a pty\n" |
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53 "-N Don't run a remote command\n" |
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54 "-f Run in background after auth\n" |
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55 "-y Always accept remote host key if unknown\n" |
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56 #ifdef ENABLE_CLI_PUBKEY_AUTH |
56
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57 "-i <identityfile> (multiple allowed)\n" |
47 | 58 #endif |
64 | 59 #ifdef ENABLE_CLI_LOCALTCPFWD |
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60 "-L <listenport:remotehost:remoteport> Local port forwarding\n" |
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61 "-g Allow remote hosts to connect to forwarded ports\n" |
62 | 62 #endif |
64 | 63 #ifdef ENABLE_CLI_REMOTETCPFWD |
62 | 64 "-R <listenport:remotehost:remoteport> Remote port forwarding\n" |
65 #endif | |
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66 "-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n" |
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67 "-K <keepalive> (0 is never, default %d)\n" |
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68 #ifdef ENABLE_CLI_PROXYCMD |
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69 "-J <proxy_program> Use program rather than tcp connection" |
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70 #endif |
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71 #ifdef DEBUG_TRACE |
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72 "-v verbose\n" |
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73 #endif |
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74 ,DROPBEAR_VERSION, cli_opts.progname, |
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75 DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE); |
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76 |
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77 } |
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78 |
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79 void cli_getopts(int argc, char ** argv) { |
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80 |
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81 unsigned int i, j; |
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82 char ** next = 0; |
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83 unsigned int cmdlen; |
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84 #ifdef ENABLE_CLI_PUBKEY_AUTH |
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85 int nextiskey = 0; /* A flag if the next argument is a keyfile */ |
47 | 86 #endif |
64 | 87 #ifdef ENABLE_CLI_LOCALTCPFWD |
62 | 88 int nextislocal = 0; |
89 #endif | |
64 | 90 #ifdef ENABLE_CLI_REMOTETCPFWD |
62 | 91 int nextisremote = 0; |
92 #endif | |
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93 #ifdef ENABLE_CLI_PROXYCMD |
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94 int nextisproxycmd = 0; |
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95 #endif |
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96 char* dummy = NULL; /* Not used for anything real */ |
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97 |
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98 char* recv_window_arg = NULL; |
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99 char* keepalive_arg = NULL; |
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100 |
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101 /* see printhelp() for options */ |
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102 cli_opts.progname = argv[0]; |
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103 cli_opts.remotehost = NULL; |
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104 cli_opts.remoteport = NULL; |
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105 cli_opts.username = NULL; |
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106 cli_opts.cmd = NULL; |
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107 cli_opts.no_cmd = 0; |
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108 cli_opts.backgrounded = 0; |
47 | 109 cli_opts.wantpty = 9; /* 9 means "it hasn't been touched", gets set later */ |
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110 cli_opts.always_accept_key = 0; |
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111 #ifdef ENABLE_CLI_PUBKEY_AUTH |
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112 cli_opts.privkeys = NULL; |
47 | 113 #endif |
64 | 114 #ifdef ENABLE_CLI_LOCALTCPFWD |
115 cli_opts.localfwds = NULL; | |
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116 opts.listen_fwd_all = 0; |
62 | 117 #endif |
64 | 118 #ifdef ENABLE_CLI_REMOTETCPFWD |
119 cli_opts.remotefwds = NULL; | |
62 | 120 #endif |
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121 /* not yet |
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122 opts.ipv4 = 1; |
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123 opts.ipv6 = 1; |
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124 */ |
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125 opts.recv_window = DEFAULT_RECV_WINDOW; |
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126 |
47 | 127 /* Iterate all the arguments */ |
46
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128 for (i = 1; i < (unsigned int)argc; i++) { |
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129 #ifdef ENABLE_CLI_PUBKEY_AUTH |
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130 if (nextiskey) { |
47 | 131 /* Load a hostkey since the previous argument was "-i" */ |
132 loadidentityfile(argv[i]); | |
133 nextiskey = 0; | |
134 continue; | |
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135 } |
47 | 136 #endif |
64 | 137 #ifdef ENABLE_CLI_REMOTETCPFWD |
138 if (nextisremote) { | |
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139 TRACE(("nextisremote true")) |
64 | 140 addforward(argv[i], &cli_opts.remotefwds); |
141 nextisremote = 0; | |
142 continue; | |
143 } | |
144 #endif | |
145 #ifdef ENABLE_CLI_LOCALTCPFWD | |
146 if (nextislocal) { | |
165
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147 TRACE(("nextislocal true")) |
64 | 148 addforward(argv[i], &cli_opts.localfwds); |
149 nextislocal = 0; | |
150 continue; | |
151 } | |
152 #endif | |
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153 if (next) { |
47 | 154 /* The previous flag set a value to assign */ |
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155 *next = argv[i]; |
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156 if (*next == NULL) { |
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157 dropbear_exit("Invalid null argument"); |
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158 } |
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159 next = NULL; |
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160 continue; |
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161 } |
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162 |
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163 if (argv[i][0] == '-') { |
47 | 164 /* A flag *waves* */ |
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165 |
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166 switch (argv[i][1]) { |
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167 case 'y': /* always accept the remote hostkey */ |
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168 cli_opts.always_accept_key = 1; |
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169 break; |
47 | 170 case 'p': /* remoteport */ |
46
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171 next = &cli_opts.remoteport; |
39
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172 break; |
68
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173 #ifdef ENABLE_CLI_PUBKEY_AUTH |
47 | 174 case 'i': /* an identityfile */ |
134 | 175 /* Keep scp happy when it changes "-i file" to "-ifile" */ |
176 if (strlen(argv[i]) > 2) { | |
177 loadidentityfile(&argv[i][2]); | |
178 } else { | |
179 nextiskey = 1; | |
180 } | |
39
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181 break; |
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182 #endif |
47 | 183 case 't': /* we want a pty */ |
184 cli_opts.wantpty = 1; | |
185 break; | |
186 case 'T': /* don't want a pty */ | |
187 cli_opts.wantpty = 0; | |
188 break; | |
325
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189 case 'N': |
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190 cli_opts.no_cmd = 1; |
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191 break; |
326
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192 case 'f': |
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193 cli_opts.backgrounded = 1; |
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194 break; |
64 | 195 #ifdef ENABLE_CLI_LOCALTCPFWD |
196 case 'L': | |
197 nextislocal = 1; | |
198 break; | |
258
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199 case 'g': |
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200 opts.listen_fwd_all = 1; |
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201 break; |
64 | 202 #endif |
203 #ifdef ENABLE_CLI_REMOTETCPFWD | |
204 case 'R': | |
205 nextisremote = 1; | |
206 break; | |
207 #endif | |
479
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208 #ifdef ENABLE_CLI_PROXYCMD |
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209 case 'J': |
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210 next = &cli_opts.proxycmd; |
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211 break; |
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212 #endif |
66
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213 case 'l': |
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214 next = &cli_opts.username; |
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215 break; |
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216 case 'h': |
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217 printhelp(); |
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218 exit(EXIT_SUCCESS); |
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219 break; |
442
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220 case 'u': |
446
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221 /* backwards compatibility with old urandom option */ |
442
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222 break; |
449
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223 case 'W': |
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224 next = &recv_window_arg; |
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225 break; |
454
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226 case 'K': |
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227 next = &keepalive_arg; |
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228 break; |
94
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229 #ifdef DEBUG_TRACE |
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230 case 'v': |
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231 debug_trace = 1; |
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232 break; |
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233 #endif |
66
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234 case 'F': |
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235 case 'e': |
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236 case 'c': |
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237 case 'm': |
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238 case 'D': |
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|
239 #ifndef ENABLE_CLI_REMOTETCPFWD |
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240 case 'R': |
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241 #endif |
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242 #ifndef ENABLE_CLI_LOCALTCPFWD |
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243 case 'L': |
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244 #endif |
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245 case 'o': |
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246 case 'b': |
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|
247 next = &dummy; |
39
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248 default: |
66
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249 fprintf(stderr, |
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250 "WARNING: Ignoring unknown argument '%s'\n", argv[i]); |
39
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251 break; |
46
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|
252 } /* Switch */ |
105 | 253 |
254 /* Now we handle args where they might be "-luser" (no spaces)*/ | |
255 if (next && strlen(argv[i]) > 2) { | |
256 *next = &argv[i][2]; | |
257 next = NULL; | |
258 } | |
46
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259 |
47 | 260 continue; /* next argument */ |
261 | |
46
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262 } else { |
165
0cfba3034be5
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134
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|
263 TRACE(("non-flag arg: '%s'", argv[i])) |
46
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264 |
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265 /* Either the hostname or commands */ |
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266 |
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267 if (cli_opts.remotehost == NULL) { |
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268 |
47 | 269 parsehostname(argv[i]); |
46
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270 |
47 | 271 } else { |
46
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|
272 |
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273 /* this is part of the commands to send - after this we |
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274 * don't parse any more options, and flags are sent as the |
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275 * command */ |
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|
276 cmdlen = 0; |
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|
277 for (j = i; j < (unsigned int)argc; j++) { |
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278 cmdlen += strlen(argv[j]) + 1; /* +1 for spaces */ |
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|
279 } |
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280 /* Allocate the space */ |
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|
281 cli_opts.cmd = (char*)m_malloc(cmdlen); |
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|
282 cli_opts.cmd[0] = '\0'; |
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|
283 |
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|
284 /* Append all the bits */ |
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|
285 for (j = i; j < (unsigned int)argc; j++) { |
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|
286 strlcat(cli_opts.cmd, argv[j], cmdlen); |
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|
287 strlcat(cli_opts.cmd, " ", cmdlen); |
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|
288 } |
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|
289 /* It'll be null-terminated here */ |
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|
290 |
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|
291 /* We've eaten all the options and flags */ |
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|
292 break; |
39
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|
293 } |
0883c0906870
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|
294 } |
0883c0906870
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|
295 } |
47 | 296 |
297 if (cli_opts.remotehost == NULL) { | |
66
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298 printhelp(); |
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|
299 exit(EXIT_FAILURE); |
47 | 300 } |
301 | |
302 if (cli_opts.remoteport == NULL) { | |
303 cli_opts.remoteport = "22"; | |
304 } | |
305 | |
306 /* If not explicitly specified with -t or -T, we don't want a pty if | |
307 * there's a command, but we do otherwise */ | |
308 if (cli_opts.wantpty == 9) { | |
309 if (cli_opts.cmd == NULL) { | |
310 cli_opts.wantpty = 1; | |
311 } else { | |
312 cli_opts.wantpty = 0; | |
313 } | |
314 } | |
326
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add -f background option to dbclient
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|
315 |
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|
316 if (cli_opts.backgrounded && cli_opts.cmd == NULL |
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|
317 && cli_opts.no_cmd == 0) { |
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|
318 dropbear_exit("command required for -f"); |
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|
319 } |
449
3e6c536bc023
Add -W <windowsize> argument and document it.
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446
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|
320 |
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|
321 if (recv_window_arg) |
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|
322 { |
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|
323 opts.recv_window = atol(recv_window_arg); |
454
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|
324 if (opts.recv_window == 0 || opts.recv_window > MAX_RECV_WINDOW) |
449
3e6c536bc023
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|
325 { |
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326 dropbear_exit("Bad recv window '%s'", recv_window_arg); |
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327 } |
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328 } |
454
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|
329 if (keepalive_arg) { |
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diff
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330 opts.keepalive_secs = strtoul(keepalive_arg, NULL, 10); |
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331 if (opts.keepalive_secs == 0 && errno == EINVAL) |
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332 { |
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333 dropbear_exit("Bad keepalive '%s'", keepalive_arg); |
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334 } |
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335 } |
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336 |
39
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337 } |
47 | 338 |
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339 #ifdef ENABLE_CLI_PUBKEY_AUTH |
47 | 340 static void loadidentityfile(const char* filename) { |
341 | |
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342 struct SignKeyList * nextkey; |
47 | 343 sign_key *key; |
344 int keytype; | |
345 | |
346 key = new_sign_key(); | |
347 keytype = DROPBEAR_SIGNKEY_ANY; | |
348 if ( readhostkey(filename, key, &keytype) != DROPBEAR_SUCCESS ) { | |
349 | |
350 fprintf(stderr, "Failed loading keyfile '%s'\n", filename); | |
351 sign_key_free(key); | |
352 | |
353 } else { | |
354 | |
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355 nextkey = (struct SignKeyList*)m_malloc(sizeof(struct SignKeyList)); |
47 | 356 nextkey->key = key; |
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357 nextkey->next = cli_opts.privkeys; |
47 | 358 nextkey->type = keytype; |
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359 cli_opts.privkeys = nextkey; |
47 | 360 } |
361 } | |
362 #endif | |
363 | |
364 | |
365 /* Parses a [user@]hostname argument. userhostarg is the argv[i] corresponding | |
366 * - note that it will be modified */ | |
64 | 367 static void parsehostname(char* orighostarg) { |
47 | 368 |
369 uid_t uid; | |
370 struct passwd *pw = NULL; | |
64 | 371 char *userhostarg = NULL; |
372 | |
373 /* We probably don't want to be editing argvs */ | |
374 userhostarg = m_strdup(orighostarg); | |
47 | 375 |
376 cli_opts.remotehost = strchr(userhostarg, '@'); | |
377 if (cli_opts.remotehost == NULL) { | |
378 /* no username portion, the cli-auth.c code can figure the | |
379 * local user's name */ | |
380 cli_opts.remotehost = userhostarg; | |
381 } else { | |
382 cli_opts.remotehost[0] = '\0'; /* Split the user/host */ | |
383 cli_opts.remotehost++; | |
384 cli_opts.username = userhostarg; | |
385 } | |
386 | |
387 if (cli_opts.username == NULL) { | |
388 uid = getuid(); | |
389 | |
390 pw = getpwuid(uid); | |
391 if (pw == NULL || pw->pw_name == NULL) { | |
392 dropbear_exit("Unknown own user"); | |
393 } | |
394 | |
395 cli_opts.username = m_strdup(pw->pw_name); | |
396 } | |
397 | |
398 if (cli_opts.remotehost[0] == '\0') { | |
399 dropbear_exit("Bad hostname"); | |
400 } | |
401 } | |
64 | 402 |
403 #ifdef ENABLE_CLI_ANYTCPFWD | |
404 /* Turn a "listenport:remoteaddr:remoteport" string into into a forwarding | |
405 * set, and add it to the forwarding list */ | |
406 static void addforward(char* origstr, struct TCPFwdList** fwdlist) { | |
407 | |
408 char * listenport = NULL; | |
409 char * connectport = NULL; | |
410 char * connectaddr = NULL; | |
411 struct TCPFwdList* newfwd = NULL; | |
412 char * str = NULL; | |
413 | |
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414 TRACE(("enter addforward")) |
64 | 415 |
411
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416 /* We need to split the original argument up. This var |
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417 is never free()d. */ |
64 | 418 str = m_strdup(origstr); |
419 | |
420 listenport = str; | |
421 | |
422 connectaddr = strchr(str, ':'); | |
423 if (connectaddr == NULL) { | |
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424 TRACE(("connectaddr == NULL")) |
64 | 425 goto fail; |
426 } | |
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427 *connectaddr = '\0'; |
64 | 428 connectaddr++; |
429 | |
430 connectport = strchr(connectaddr, ':'); | |
431 if (connectport == NULL) { | |
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432 TRACE(("connectport == NULL")) |
64 | 433 goto fail; |
434 } | |
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435 *connectport = '\0'; |
64 | 436 connectport++; |
437 | |
438 newfwd = (struct TCPFwdList*)m_malloc(sizeof(struct TCPFwdList)); | |
439 | |
440 /* Now we check the ports - note that the port ints are unsigned, | |
441 * the check later only checks for >= MAX_PORT */ | |
442 newfwd->listenport = strtol(listenport, NULL, 10); | |
443 if (errno != 0) { | |
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444 TRACE(("bad listenport strtol")) |
64 | 445 goto fail; |
446 } | |
447 | |
448 newfwd->connectport = strtol(connectport, NULL, 10); | |
449 if (errno != 0) { | |
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450 TRACE(("bad connectport strtol")) |
64 | 451 goto fail; |
452 } | |
453 | |
454 newfwd->connectaddr = connectaddr; | |
455 | |
456 if (newfwd->listenport > 65535) { | |
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457 TRACE(("listenport > 65535")) |
64 | 458 goto badport; |
459 } | |
460 | |
461 if (newfwd->connectport > 65535) { | |
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462 TRACE(("connectport > 65535")) |
64 | 463 goto badport; |
464 } | |
465 | |
466 newfwd->next = *fwdlist; | |
467 *fwdlist = newfwd; | |
468 | |
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469 TRACE(("leave addforward: done")) |
64 | 470 return; |
471 | |
472 fail: | |
473 dropbear_exit("Bad TCP forward '%s'", origstr); | |
474 | |
475 badport: | |
476 dropbear_exit("Bad TCP port in '%s'", origstr); | |
477 } | |
478 #endif |