1 /*
2 * ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3 *
4 * Copyright (c) 1997-2021 ircd-hybrid development team
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19 * USA
20 */
21
22 /*! \file m_topic.c
23 * \brief Includes required functions for processing the TOPIC command.
24 * \version $Id: m_topic.c 9858 2021-01-01 04:43:42Z michael $
25 */
26
27 #include "stdinc.h"
28 #include "list.h"
29 #include "channel.h"
30 #include "channel_mode.h"
31 #include "client.h"
32 #include "conf.h"
33 #include "hash.h"
34 #include "irc_string.h"
35 #include "ircd.h"
36 #include "numeric.h"
37 #include "send.h"
38 #include "parse.h"
39 #include "modules.h"
40 #include "packet.h"
41
42
43 /*! \brief TOPIC command handler
44 *
45 * \param source_p Pointer to allocated Client struct from which the message
46 * originally comes from. This can be a local or remote client.
47 * \param parc Integer holding the number of supplied arguments.
48 * \param parv Argument vector where parv[0] .. parv[parc-1] are non-NULL
49 * pointers.
50 * \note Valid arguments for this command are:
51 * - parv[0] = command
52 * - parv[1] = channel name
53 * - parv[2] = topic text, if setting topic (can be an empty string)
54 */
55 static void
m_topic(struct Client * source_p,int parc,char * parv[])56 m_topic(struct Client *source_p, int parc, char *parv[])
57 {
58 struct Channel *channel = hash_find_channel(parv[1]);
59 if (channel == NULL)
60 {
61 sendto_one_numeric(source_p, &me, ERR_NOSUCHCHANNEL, parv[1]);
62 return;
63 }
64
65 /* Setting topic */
66 if (parc > 2)
67 {
68 const struct ChannelMember *member = member_find_link(source_p, channel);
69 if (member == NULL)
70 {
71 sendto_one_numeric(source_p, &me, ERR_NOTONCHANNEL, channel->name);
72 return;
73 }
74
75 if (!HasCMode(channel, MODE_TOPICLIMIT) ||
76 member_has_flags(member, CHFL_CHANOP | CHFL_HALFOP) == true)
77 {
78 char topic_info[NICKLEN + USERLEN + HOSTLEN + 3]; /* +3 for !, @, \0 */
79
80 snprintf(topic_info, sizeof(topic_info), "%s!%s@%s", source_p->name,
81 source_p->username, source_p->host);
82 channel_set_topic(channel, parv[2], topic_info, event_base->time.sec_real, true);
83
84 sendto_server(source_p, 0, 0, ":%s TOPIC %s :%s",
85 source_p->id, channel->name,
86 channel->topic);
87 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s!%s@%s TOPIC %s :%s",
88 source_p->name,
89 source_p->username,
90 source_p->host,
91 channel->name, channel->topic);
92 }
93 else
94 sendto_one_numeric(source_p, &me, ERR_CHANOPRIVSNEEDED, channel->name);
95 }
96 else /* Only asking for topic */
97 {
98 if (!SecretChannel(channel) || member_find_link(source_p, channel))
99 {
100 if (channel->topic[0] == '\0')
101 sendto_one_numeric(source_p, &me, RPL_NOTOPIC, channel->name);
102 else
103 {
104 sendto_one_numeric(source_p, &me, RPL_TOPIC,
105 channel->name, channel->topic);
106 sendto_one_numeric(source_p, &me, RPL_TOPICWHOTIME, channel->name,
107 channel->topic_info,
108 channel->topic_time);
109 }
110 }
111 else
112 sendto_one_numeric(source_p, &me, ERR_NOTONCHANNEL, channel->name);
113 }
114 }
115
116
117 /*! \brief TOPIC command handler
118 *
119 * \param source_p Pointer to allocated Client struct from which the message
120 * originally comes from. This can be a local or remote client.
121 * \param parc Integer holding the number of supplied arguments.
122 * \param parv Argument vector where parv[0] .. parv[parc-1] are non-NULL
123 * pointers.
124 * \note Valid arguments for this command are:
125 * - parv[0] = command
126 * - parv[1] = channel name
127 * - parv[2] = topic text (can be an empty string)
128 */
129 static void
ms_topic(struct Client * source_p,int parc,char * parv[])130 ms_topic(struct Client *source_p, int parc, char *parv[])
131 {
132 struct Channel *channel = hash_find_channel(parv[1]);
133 if (channel == NULL)
134 {
135 sendto_one_numeric(source_p, &me, ERR_NOSUCHCHANNEL, parv[1]);
136 return;
137 }
138
139 char topic_info[NICKLEN + USERLEN + HOSTLEN + 3]; /* +3 for !, @, \0 */
140 if (IsClient(source_p))
141 snprintf(topic_info, sizeof(topic_info), "%s!%s@%s", source_p->name,
142 source_p->username, source_p->host);
143 else if (IsHidden(source_p) || ConfigServerHide.hide_servers)
144 strlcpy(topic_info, me.name, sizeof(topic_info));
145 else
146 strlcpy(topic_info, source_p->name, sizeof(topic_info));
147
148 channel_set_topic(channel, parv[2], topic_info, event_base->time.sec_real, false);
149
150 sendto_server(source_p, 0, 0, ":%s TOPIC %s :%s",
151 source_p->id, channel->name,
152 channel->topic);
153
154 if (IsClient(source_p))
155 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s!%s@%s TOPIC %s :%s",
156 source_p->name,
157 source_p->username,
158 source_p->host,
159 channel->name, channel->topic);
160 else
161 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s TOPIC %s :%s",
162 (IsHidden(source_p) || ConfigServerHide.hide_servers) ? me.name : source_p->name,
163 channel->name, channel->topic);
164 }
165
166 static struct Message topic_msgtab =
167 {
168 .cmd = "TOPIC",
169 .handlers[UNREGISTERED_HANDLER] = { .handler = m_unregistered },
170 .handlers[CLIENT_HANDLER] = { .handler = m_topic, .args_min = 2, .end_grace_period = true },
171 .handlers[SERVER_HANDLER] = { .handler = ms_topic, .args_min = 3, .empty_last_arg = true },
172 .handlers[ENCAP_HANDLER] = { .handler = m_ignore },
173 .handlers[OPER_HANDLER] = { .handler = m_topic, .args_min = 2, .end_grace_period = true }
174 };
175
176 static void
module_init(void)177 module_init(void)
178 {
179 mod_add_cmd(&topic_msgtab);
180 }
181
182 static void
module_exit(void)183 module_exit(void)
184 {
185 mod_del_cmd(&topic_msgtab);
186 }
187
188 struct module module_entry =
189 {
190 .version = "$Revision: 9858 $",
191 .modinit = module_init,
192 .modexit = module_exit,
193 };
194