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1 | /* | |
2 | * charybdis: an advanced Internet Relay Chat Daemon(ircd). | |
3 | * m_scan.c: Provides information about various targets on various topics | |
4 | * | |
5 | * Copyright (c) 2006 William Pitcock <nenolod -at- nenolod.net> | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions are | |
9 | * met: | |
10 | * | |
11 | * 1.Redistributions of source code must retain the above copyright notice, | |
12 | * this list of conditions and the following disclaimer. | |
13 | * 2.Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3.The name of the author may not be used to endorse or promote products | |
17 | * derived from this software without specific prior written permission. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
21 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
22 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
23 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
24 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
25 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
27 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
28 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
29 | * POSSIBILITY OF SUCH DAMAGE. | |
30 | */ | |
31 | ||
32 | #include "stdinc.h" | |
33 | #include "class.h" | |
34 | #include "hook.h" | |
35 | #include "client.h" | |
36 | #include "hash.h" | |
37 | #include "hash.h" | |
38 | #include "match.h" | |
39 | #include "ircd.h" | |
40 | #include "numeric.h" | |
41 | #include "s_serv.h" | |
42 | #include "s_conf.h" | |
43 | #include "s_newconf.h" | |
44 | #include "s_user.h" | |
45 | #include "send.h" | |
46 | #include "msg.h" | |
47 | #include "parse.h" | |
48 | #include "modules.h" | |
49 | #include "logger.h" | |
50 | ||
51 | static const char scan_desc[] = | |
52 | "Provides the SCAN command to show users that have a mode set or cleared"; | |
53 | ||
54 | static void mo_scan(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
55 | static void scan_umodes(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
56 | ||
57 | struct Message scan_msgtab = { | |
58 | "SCAN", 0, 0, 0, 0, | |
59 | {mg_ignore, mg_not_oper, mg_ignore, mg_ignore, mg_ignore, {mo_scan, 2}} | |
60 | }; | |
61 | ||
62 | mapi_clist_av1 scan_clist[] = { &scan_msgtab, NULL }; | |
63 | ||
64 | DECLARE_MODULE_AV2(scan, NULL, NULL, scan_clist, NULL, NULL, NULL, NULL, scan_desc); | |
65 | ||
66 | typedef void (*scan_handler)(struct MsgBuf *, struct Client *, struct Client *, int, | |
67 | const char **); | |
68 | ||
69 | struct scan_cmd { | |
70 | const char *name; | |
71 | int operlevel; | |
72 | scan_handler handler; | |
73 | } scan_cmds[] = { | |
74 | {"UMODES", L_OPER, scan_umodes}, | |
75 | {NULL, 0, NULL} | |
76 | }; | |
77 | ||
78 | static const char *empty_sockhost = "255.255.255.255"; | |
79 | static const char *spoofed_sockhost = "0"; | |
80 | ||
81 | /* | |
82 | * m_scan | |
83 | * parv[1] = options [or target] | |
84 | * parv[2] = [target] | |
85 | */ | |
86 | static void | |
87 | mo_scan(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, | |
88 | const char *parv[]) | |
89 | { | |
90 | struct scan_cmd *sptr; | |
91 | ||
92 | for (sptr = scan_cmds; sptr->name != NULL; sptr++) | |
93 | { | |
94 | if (!irccmp(sptr->name, parv[1])) | |
95 | { | |
96 | if (!(sptr->operlevel == L_ADMIN && !IsOperAdmin(source_p))) | |
97 | sptr->handler(msgbuf_p, client_p, source_p, parc, parv); | |
98 | ||
99 | return; | |
100 | } | |
101 | } | |
102 | ||
103 | sendto_one_notice(source_p, ":*** %s is not an implemented SCAN target", | |
104 | parv[1]); | |
105 | } | |
106 | ||
107 | static void | |
108 | scan_umodes(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, | |
109 | const char *parv[]) | |
110 | { | |
111 | unsigned int allowed_umodes = 0, disallowed_umodes = 0; | |
112 | int what = MODE_ADD; | |
113 | int mode; | |
114 | bool list_users = true; | |
115 | int list_max = 500; | |
116 | int list_count = 0, count = 0; | |
117 | const char *mask = NULL; | |
118 | const char *c; | |
119 | struct Client *target_p; | |
120 | rb_dlink_list *target_list = &lclient_list; /* local clients only by default */ | |
121 | rb_dlink_node *tn; | |
122 | int i; | |
123 | const char *sockhost; | |
124 | char buf[512]; | |
125 | ||
126 | if (parc < 3) | |
127 | { | |
128 | if (MyClient(source_p)) | |
129 | sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS), | |
130 | me.name, source_p->name, "SCAN UMODES"); | |
131 | ||
132 | return; | |
133 | } | |
134 | ||
135 | if (parv[2][0] != '+' && parv[2][0] != '-') | |
136 | { | |
137 | sendto_one_notice(source_p, ":SCAN UMODES: umodes parameter must start with '+' or '-'"); | |
138 | return; | |
139 | } | |
140 | ||
141 | for (c = parv[2]; *c; c++) | |
142 | { | |
143 | switch(*c) | |
144 | { | |
145 | case '+': | |
146 | what = MODE_ADD; | |
147 | break; | |
148 | case '-': | |
149 | what = MODE_DEL; | |
150 | break; | |
151 | default: | |
152 | if ((mode = user_modes[(unsigned char) *c]) != 0) | |
153 | { | |
154 | if (what == MODE_ADD) | |
155 | allowed_umodes |= mode; | |
156 | else | |
157 | disallowed_umodes |= mode; | |
158 | } | |
159 | } | |
160 | } | |
161 | ||
162 | for (i = 3; i < parc; i++) | |
163 | { | |
164 | if (!irccmp(parv[i], "no-list")) | |
165 | list_users = false; | |
166 | else if (!irccmp(parv[i], "list")) | |
167 | list_users = true; | |
168 | else if (!irccmp(parv[i], "global")) | |
169 | target_list = &global_client_list; | |
170 | else if (i < (parc - 1)) | |
171 | { | |
172 | if (!irccmp(parv[i], "list-max")) | |
173 | list_max = atoi(parv[++i]); | |
174 | else if (!irccmp(parv[i], "mask")) | |
175 | mask = parv[++i]; | |
176 | else | |
177 | { | |
178 | sendto_one_notice(source_p, ":SCAN UMODES: invalid parameters"); | |
179 | return; | |
180 | } | |
181 | } | |
182 | else | |
183 | { | |
184 | sendto_one_notice(source_p, ":SCAN UMODES: invalid parameters"); | |
185 | return; | |
186 | } | |
187 | } | |
188 | if (target_list == &global_client_list && list_users) | |
189 | { | |
190 | if (IsOperSpy(source_p)) | |
191 | { | |
192 | if (!ConfigFileEntry.operspy_dont_care_user_info) | |
193 | { | |
194 | rb_strlcpy(buf, "UMODES", sizeof buf); | |
195 | for (i = 2; i < parc; i++) | |
196 | { | |
197 | rb_strlcat(buf, " ", sizeof buf); | |
198 | rb_strlcat(buf, parv[i], sizeof buf); | |
199 | } | |
200 | report_operspy(source_p, "SCAN", buf); | |
201 | } | |
202 | } | |
203 | else | |
204 | { | |
205 | sendto_one(source_p, form_str(ERR_NOPRIVS), | |
206 | me.name, source_p->name, "oper_spy"); | |
207 | return; | |
208 | } | |
209 | } | |
210 | ||
211 | RB_DLINK_FOREACH(tn, target_list->head) | |
212 | { | |
213 | unsigned int working_umodes = 0; | |
214 | char maskbuf[BUFSIZE]; | |
215 | ||
216 | target_p = tn->data; | |
217 | ||
218 | if (!IsClient(target_p)) | |
219 | continue; | |
220 | ||
221 | if(EmptyString(target_p->sockhost)) | |
222 | sockhost = empty_sockhost; | |
223 | else if(!show_ip(source_p, target_p)) | |
224 | sockhost = spoofed_sockhost; | |
225 | else | |
226 | sockhost = target_p->sockhost; | |
227 | ||
228 | working_umodes = target_p->umodes; | |
229 | ||
230 | /* require that we have the allowed umodes... */ | |
231 | if ((working_umodes & allowed_umodes) != allowed_umodes) | |
232 | continue; | |
233 | ||
234 | /* require that we have NONE of the disallowed ones */ | |
235 | if ((working_umodes & disallowed_umodes) != 0) | |
236 | continue; | |
237 | ||
238 | if (mask != NULL) | |
239 | { | |
240 | snprintf(maskbuf, BUFSIZE, "%s!%s@%s", | |
241 | target_p->name, target_p->username, target_p->host); | |
242 | ||
243 | if (!match(mask, maskbuf)) | |
244 | continue; | |
245 | } | |
246 | ||
247 | if (list_users && (!list_max || (list_count < list_max))) | |
248 | { | |
249 | char modebuf[BUFSIZE]; | |
250 | char *m = modebuf; | |
251 | ||
252 | *m++ = '+'; | |
253 | ||
254 | for (i = 0; i < 128; i++) | |
255 | { | |
256 | if (target_p->umodes & user_modes[i]) | |
257 | *m++ = (char) i; | |
258 | } | |
259 | ||
260 | *m++ = '\0'; | |
261 | ||
262 | list_count++; | |
263 | ||
264 | sendto_one_numeric(source_p, RPL_SCANUMODES, | |
265 | form_str(RPL_SCANUMODES), | |
266 | target_p->name, target_p->username, | |
267 | target_p->host, sockhost, | |
268 | target_p->servptr->name, modebuf, | |
269 | target_p->info); | |
270 | } | |
271 | count++; | |
272 | } | |
273 | ||
274 | sendto_one_numeric(source_p, RPL_SCANMATCHED, | |
275 | form_str(RPL_SCANMATCHED), count); | |
276 | } |