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1 | /* |
2 | * $Id: libnet_port_list.c,v 1.20 2005/11/29 22:28:44 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_port_list.c - transport layer port list chaining code | |
6 | * | |
7 | * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> | |
8 | * All rights reserved. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
29 | * SUCH DAMAGE. | |
30 | * | |
31 | */ | |
32 | ||
33 | #if (HAVE_CONFIG_H) | |
34 | #include "../include/config.h" | |
35 | #endif | |
36 | #if (!(_WIN32) || (__CYGWIN__)) | |
37 | #include "../include/libnet.h" | |
38 | #else | |
39 | #include "../include/win32/libnet.h" | |
40 | #endif | |
41 | ||
42 | u_int16_t *all_lists; | |
43 | ||
44 | int | |
45 | libnet_plist_chain_new(libnet_t *l, libnet_plist_t **plist, char *token_list) | |
46 | { | |
47 | int8_t libnet_plist_legal_tokens[] = "0123456789,- "; | |
48 | libnet_plist_t *tmp; | |
49 | int8_t *tok; | |
50 | int i, j, valid_token, cur_node; | |
51 | u_int16_t *all_lists_tmp; | |
52 | static u_int8_t cur_id; | |
53 | ||
54 | if (l == NULL) | |
55 | { | |
56 | return (-1); | |
57 | } | |
58 | ||
59 | if (token_list == NULL) | |
60 | { | |
61 | return (-1); | |
62 | } | |
63 | ||
64 | /* | |
65 | * Make sure we have legal tokens. | |
66 | */ | |
67 | for (i = 0; token_list[i]; i++) | |
68 | { | |
69 | for (j = 0, valid_token = 0; libnet_plist_legal_tokens[j]; j++) | |
70 | { | |
71 | if (libnet_plist_legal_tokens[j] == token_list[i]) | |
72 | { | |
73 | valid_token = 1; | |
74 | break; | |
75 | } | |
76 | } | |
77 | if (!valid_token) | |
78 | { | |
79 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
80 | "libnet_build_plist_chain: illegal token # %d (%c)\n", | |
81 | i + 1, | |
82 | token_list[i]); | |
83 | *plist = NULL; | |
84 | return (-1); | |
85 | } | |
86 | } | |
87 | ||
88 | /* head node */ | |
89 | *plist = malloc(sizeof (libnet_plist_t)); | |
90 | ||
91 | if (!(*plist)) | |
92 | { | |
93 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
94 | "libnet_build_plist_chain: malloc %s\n", strerror(errno)); | |
95 | *plist = NULL; | |
96 | return (-1); | |
97 | } | |
98 | ||
99 | tmp = *plist; | |
100 | tmp->node = cur_node = 0; | |
101 | tmp->next = NULL; | |
102 | tmp->id = cur_id; | |
103 | all_lists_tmp = all_lists; | |
104 | all_lists = realloc(all_lists_tmp, (sizeof(u_int16_t) * (cur_id + 1))); | |
105 | if (!all_lists) | |
106 | { | |
107 | all_lists = all_lists_tmp; | |
108 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
109 | "libnet_build_plist_chain: realloc %s\n", strerror(errno)); | |
110 | *plist = NULL; | |
111 | return(-1); | |
112 | } | |
113 | ||
114 | all_lists[cur_id++] = 0; | |
115 | ||
116 | /* | |
117 | * Using strtok successively proved problematic. We solve this by | |
118 | * calling it once, then manually extracting the elements from the token. | |
119 | * In the case of bport > eport, we swap them. | |
120 | */ | |
121 | for (i = 0; (tok = strtok(!i ? token_list : NULL, ",")); i = 1, cur_node++) | |
122 | { | |
123 | /* | |
124 | * The first iteration we will have a head node allocated so we don't | |
125 | * need to malloc(). | |
126 | */ | |
127 | if (i) | |
128 | { | |
129 | tmp->next = malloc(sizeof (libnet_plist_t)); | |
130 | if (!tmp) | |
131 | { | |
132 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
133 | "libnet_build_plist_chain: malloc %s\n", strerror(errno)); | |
134 | /* | |
135 | * XXX - potential memory leak if other nodes are allocated | |
136 | * but not freed. | |
137 | */ | |
138 | *plist = NULL; | |
139 | return(-1); | |
140 | } | |
141 | tmp = tmp->next; | |
142 | tmp->node = cur_node; | |
143 | tmp->next = NULL; | |
144 | } | |
145 | tmp->bport = atoi(tok); | |
146 | ||
147 | /* | |
148 | * Step past this port number. | |
149 | */ | |
150 | j = 0; | |
151 | while (isdigit((int)tok[j])) | |
152 | { | |
153 | j++; | |
154 | } | |
155 | ||
156 | /* | |
157 | * If we have a delimiting dash and are NOT at the end of the token | |
158 | * array, we can assume it's the end port, otherwise if we just have | |
159 | * a dash, we consider it int16_thand for `inclusive of all ports up to | |
160 | * 65535. Finally, if we have no dash, we assume this token is a | |
161 | * single port only. | |
162 | */ | |
163 | if (tok[j] == '-') | |
164 | { | |
165 | tmp->eport = (++j != strlen(tok)) ? atoi(&tok[j]) : 65535; | |
166 | } | |
167 | else | |
168 | { | |
169 | tmp->eport = tmp->bport; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Do we need to swap the values? | |
174 | */ | |
175 | if (tmp->bport > tmp->eport) | |
176 | { | |
177 | tmp->bport ^= tmp->eport; | |
178 | tmp->eport ^= tmp->bport; | |
179 | tmp->bport ^= tmp->eport; | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * The head node needs to hold the total node count. | |
185 | */ | |
186 | (*plist)->node = cur_node; | |
187 | return (1); | |
188 | } | |
189 | ||
190 | int | |
191 | libnet_plist_chain_next_pair(libnet_plist_t *plist, u_int16_t *bport, | |
192 | u_int16_t *eport) | |
193 | { | |
194 | u_int16_t *node_cnt; | |
195 | u_int16_t tmp_cnt; | |
196 | ||
197 | node_cnt = &(all_lists[plist->id]); | |
198 | if (plist == NULL) | |
199 | { | |
200 | return (-1); | |
201 | } | |
202 | ||
203 | /* | |
204 | * We are at the end of the list. | |
205 | */ | |
206 | if (*node_cnt == plist->node) | |
207 | { | |
208 | *node_cnt = 0; | |
209 | *bport = 0; | |
210 | *eport = 0; | |
211 | return (0); | |
212 | } | |
213 | ||
214 | for (tmp_cnt = *node_cnt; tmp_cnt; tmp_cnt--, plist = plist->next) ; | |
215 | *bport = plist->bport; | |
216 | *eport = plist->eport; | |
217 | *node_cnt += 1; | |
218 | return (1); | |
219 | } | |
220 | ||
221 | int | |
222 | libnet_plist_chain_dump(libnet_plist_t *plist) | |
223 | { | |
224 | if (plist == NULL) | |
225 | { | |
226 | return (-1); | |
227 | } | |
228 | ||
229 | for (; plist; plist = plist->next) | |
230 | { | |
231 | if (plist->bport == plist->eport) | |
232 | { | |
233 | fprintf(stdout, "%d ", plist->bport); | |
234 | } | |
235 | else | |
236 | { | |
237 | fprintf(stdout, "%d-%d ", plist->bport, plist->eport); | |
238 | } | |
239 | } | |
240 | fprintf(stdout, "\n"); | |
241 | return (1); | |
242 | } | |
243 | ||
244 | char * | |
245 | libnet_plist_chain_dump_string(libnet_plist_t *plist) | |
246 | { | |
247 | char buf[BUFSIZ] = {0}; | |
248 | int i, j; | |
249 | ||
250 | if (plist == NULL) | |
251 | { | |
252 | return (NULL); | |
253 | } | |
254 | ||
255 | for (i = 0, j = 0; plist; plist = plist->next) | |
256 | { | |
257 | if (plist->bport == plist->eport) | |
258 | { | |
259 | i = snprintf(&buf[j], BUFSIZ, "%d", plist->bport); | |
260 | } | |
261 | else | |
262 | { | |
263 | i = snprintf(&buf[j], BUFSIZ, "%d-%d", plist->bport, plist->eport); | |
264 | } | |
265 | j += i; | |
266 | if (plist->next) | |
267 | { | |
268 | snprintf(&buf[j++], BUFSIZ, ","); | |
269 | } | |
270 | } | |
271 | return (strdup(buf)); /* XXX - reentrancy == no */ | |
272 | } | |
273 | ||
274 | int | |
275 | libnet_plist_chain_free(libnet_plist_t *plist) | |
276 | { | |
277 | u_int16_t i; | |
278 | libnet_plist_t *tmp; | |
279 | ||
280 | if (plist == NULL) | |
281 | { | |
282 | return (-1); | |
283 | } | |
284 | ||
285 | for (i = plist->node; i; i--) | |
286 | { | |
287 | tmp = plist; | |
288 | plist = plist->next; | |
289 | free(tmp); | |
290 | } | |
291 | plist = NULL; | |
292 | return (1); | |
293 | } | |
294 | ||
295 | /* EOF */ |