Use the default debug hook if possible
[strongswan.git] / src / pki / command.c
1 /*
2 * Copyright (C) 2009 Martin Willi
3 * Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 #include "command.h"
17 #include "pki.h"
18
19 #define _GNU_SOURCE
20 #include <getopt.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <stdio.h>
24
25 #include <library.h>
26 #include <debug.h>
27 #include <utils/optionsfrom.h>
28
29 /**
30 * Registered commands.
31 */
32 command_t cmds[MAX_COMMANDS];
33
34 /**
35 * active command.
36 */
37 static int active = 0;
38
39 /**
40 * number of registered commands
41 */
42 static int registered = 0;
43
44 /**
45 * help command index
46 */
47 static int help_idx;
48
49 static int argc;
50
51 static char **argv;
52
53 static options_t *options;
54
55 /**
56 * Global options used by all subcommands
57 */
58 static struct option command_opts[MAX_COMMANDS > MAX_OPTIONS ?: MAX_OPTIONS];
59
60 /**
61 * Global optstring used by all subcommands
62 */
63 static char command_optstring[(MAX_COMMANDS > MAX_OPTIONS ?: MAX_OPTIONS) * 3];
64
65 /**
66 * Build command_opts/command_optstr for the active command
67 */
68 static void build_opts()
69 {
70 int i, pos = 0;
71
72 memset(command_opts, 0, sizeof(command_opts));
73 memset(command_optstring, 0, sizeof(command_optstring));
74 if (active == help_idx)
75 {
76 for (i = 0; cmds[i].cmd; i++)
77 {
78 command_opts[i].name = cmds[i].cmd;
79 command_opts[i].val = cmds[i].op;
80 command_optstring[i] = cmds[i].op;
81 }
82 }
83 else
84 {
85 for (i = 0; cmds[active].options[i].name; i++)
86 {
87 command_opts[i].name = cmds[active].options[i].name;
88 command_opts[i].has_arg = cmds[active].options[i].arg;
89 command_opts[i].val = cmds[active].options[i].op;
90 command_optstring[pos++] = cmds[active].options[i].op;
91 switch (cmds[active].options[i].arg)
92 {
93 case optional_argument:
94 command_optstring[pos++] = ':';
95 /* FALL */
96 case required_argument:
97 command_optstring[pos++] = ':';
98 /* FALL */
99 case no_argument:
100 default:
101 break;
102 }
103 }
104 }
105 }
106
107 /**
108 * getopt_long wrapper
109 */
110 int command_getopt(char **arg)
111 {
112 int op;
113
114 while (TRUE)
115 {
116 op = getopt_long(argc, argv, command_optstring, command_opts, NULL);
117 switch (op)
118 {
119 case '+':
120 if (!options->from(options, optarg, &argc, &argv, optind))
121 {
122 /* a error value */
123 return 255;
124 }
125 continue;
126 case 'v':
127 dbg_default_set_level(atoi(optarg));
128 continue;
129 default:
130 *arg = optarg;
131 return op;
132 }
133 }
134 }
135
136 /**
137 * Register a command
138 */
139 void command_register(command_t command)
140 {
141 int i;
142
143 cmds[registered] = command;
144 /* append default options, but not to --help */
145 if (!active)
146 {
147 for (i = 0; i < countof(cmds[registered].options); i++)
148 {
149 if (cmds[registered].options[i].name)
150 {
151 continue;
152 }
153 cmds[registered].options[i++] = (command_option_t) {
154 "debug", 'v', 1, "set debug level, default: 1"
155 };
156 cmds[registered].options[i++] = (command_option_t) {
157 "options", '+', 1, "read command line options from file"
158 };
159 break;
160 }
161 }
162 registered++;
163 }
164
165 /**
166 * Print usage text, with an optional error
167 */
168 int command_usage(char *error)
169 {
170 FILE *out = stdout;
171 char buf[64];
172 int i;
173
174 if (error)
175 {
176 out = stderr;
177 fprintf(out, "Error: %s\n", error);
178 }
179 fprintf(out, "strongSwan %s PKI tool\n", VERSION);
180 fprintf(out, "usage:\n");
181 if (active == help_idx)
182 {
183 for (i = 0; cmds[i].cmd; i++)
184 {
185 snprintf(buf, sizeof(buf), "--%s (-%c)", cmds[i].cmd, cmds[i].op);
186 fprintf(out, " pki %-14s %s\n", buf, cmds[i].description);
187 }
188 }
189 else
190 {
191 for (i = 0; cmds[active].line[i]; i++)
192 {
193 if (i == 0)
194 {
195 fprintf(out, " pki --%s %s\n",
196 cmds[active].cmd, cmds[active].line[i]);
197 }
198 else
199 {
200 fprintf(out, " %s\n", cmds[active].line[i]);
201 }
202 }
203 for (i = 0; cmds[active].options[i].name; i++)
204 {
205 snprintf(buf, sizeof(buf), "--%s (-%c)",
206 cmds[active].options[i].name, cmds[active].options[i].op);
207 fprintf(out, " %-15s %s\n",
208 buf, cmds[active].options[i].desc);
209 }
210 }
211 return error != NULL;
212 }
213
214
215 /**
216 * Show usage information
217 */
218 static int help(int argc, char *argv[])
219 {
220 return command_usage(NULL);
221 }
222
223 /**
224 * Dispatch cleanup hook
225 */
226 static void cleanup()
227 {
228 options->destroy(options);
229 }
230
231 /**
232 * Dispatch commands.
233 */
234 int command_dispatch(int c, char *v[])
235 {
236 int op, i;
237
238 options = options_create();
239 atexit(cleanup);
240 active = help_idx = registered;
241 argc = c;
242 argv = v;
243 command_register((command_t){help, 'h', "help", "show usage information"});
244
245 build_opts();
246 op = getopt_long(c, v, command_optstring, command_opts, NULL);
247 for (i = 0; cmds[i].cmd; i++)
248 {
249 if (cmds[i].op == op)
250 {
251 active = i;
252 build_opts();
253 return cmds[i].call();
254 }
255 }
256 return command_usage("invalid operation");
257 }
258