1 /*
2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2021, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
5 *
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
18 *
19 * ---
20 *
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
24 *
25 * ---
26 *
27 * wu.c: Write a telegram to a user from another
28 *
29 * Known contributors to this file:
30 * Steve McClure, 2000
31 * Markus Armbruster, 2005-2021
32 */
33
34 #include <config.h>
35
36 #include <fcntl.h>
37 #include <stdarg.h>
38 #include <sys/uio.h>
39 #include <unistd.h>
40 #include "misc.h"
41 #include "nat.h"
42 #include "optlist.h"
43 #include "prototypes.h"
44 #include "tel.h"
45 #include "update.h"
46
47 static struct telstr last_tel[MAXNOC];
48
49 void
clear_telegram_is_new(natid to)50 clear_telegram_is_new(natid to)
51 {
52 last_tel[to].tel_from = NATID_BAD;
53 }
54
55 static int
telegram_is_new(natid to,struct telstr * tel)56 telegram_is_new(natid to, struct telstr *tel)
57 {
58 if (tel->tel_from != last_tel[to].tel_from
59 || tel->tel_type != last_tel[to].tel_type
60 || (tel->tel_type != TEL_UPDATE
61 && tel->tel_date - last_tel[to].tel_date > TEL_SECONDS)) {
62 last_tel[to] = *tel;
63 return 1;
64 }
65 return 0;
66 }
67
68 /*
69 * Send a telegram from @from to @to.
70 * Format text to send using printf-style @format and optional
71 * arguments. It is plain ASCII.
72 * If running from the update, telegram type is TEL_UPDATE.
73 * Else if @from is a deity, type is TEL_BULLETIN.
74 * Else it is TEL_NORM.
75 * Return 0 on success, -1 on error.
76 */
77 int
wu(natid from,natid to,char * format,...)78 wu(natid from, natid to, char *format, ...)
79 {
80 struct natstr *np;
81 va_list ap;
82 char buf[4096];
83
84 va_start(ap, format);
85 (void)vsprintf(buf, format, ap);
86 va_end(ap);
87 np = getnatp(from);
88 if (update_running)
89 return typed_wu(from, to, buf, TEL_UPDATE);
90 else if (np->nat_stat == STAT_GOD)
91 return typed_wu(from, to, buf, TEL_BULLETIN);
92 else
93 return typed_wu(from, to, buf, TEL_NORM);
94 }
95
96 /*
97 * Send a telegram from @from to @to.
98 * @message is the text to send, in UTF-8.
99 * @type is the telegram type.
100 * Return 0 on success, -1 on error.
101 */
102 int
typed_wu(natid from,natid to,char * message,int type)103 typed_wu(natid from, natid to, char *message, int type)
104 {
105 size_t len;
106 struct telstr tel;
107 struct natstr *np;
108 struct iovec iov[2];
109 int fd;
110 char box[1024];
111 struct player *other;
112
113 if (type == TEL_ANNOUNCE) {
114 strcpy(box, annfil);
115 np = NULL;
116 } else {
117 mailbox(box, to);
118 np = getnatp(to);
119 if (!np || np->nat_stat < STAT_SANCT)
120 return -1;
121 }
122
123 #if !defined(_WIN32)
124 if ((fd = open(box, O_WRONLY | O_APPEND, 0)) < 0) {
125 #else
126 if ((fd = open(box, O_WRONLY | O_APPEND | O_BINARY, 0)) < 0) {
127 #endif
128 logerror("telegram 'open' of %s failed", box);
129 return -1;
130 }
131
132 memset(&tel, 0, sizeof(tel));
133 tel.tel_from = from;
134 (void)time(&tel.tel_date);
135 len = strlen(message);
136 CANT_HAPPEN(len && message[len - 1] != '\n');
137 tel.tel_length = len;
138 tel.tel_type = type;
139 tel.tel_cont = !telegram_is_new(to, &tel);
140 iov[0].iov_base = &tel;
141 iov[0].iov_len = sizeof(tel);
142 iov[1].iov_base = message;
143 iov[1].iov_len = len;
144 if (writev(fd, iov, 2) < (int)(iov[0].iov_len + iov[1].iov_len)) {
145 logerror("telegram 'write' to %s failed", box);
146 close(fd);
147 return -1;
148 }
149 if (close(fd) < 0) {
150 logerror("telegram 'write' to %s failed to close.", box);
151 return -1;
152 }
153
154 if (type == TEL_ANNOUNCE) {
155 for (to = 0; NULL != (np = getnatp(to)); to++) {
156 if (np->nat_stat < STAT_SANCT)
157 continue;
158 if (!nat_accepts(to, from, REJ_ANNO))
159 continue;
160 if (!np->nat_ann || !tel.tel_cont) {
161 np->nat_ann++;
162 putnat(np);
163 }
164 }
165 } else {
166 if (!np->nat_tgms || !tel.tel_cont) {
167 np->nat_tgms++;
168 putnat(np);
169 if (np->nat_flags & NF_INFORM) {
170 other = getplayer(to);
171 if (other) {
172 if (np->nat_tgms == 1)
173 pr_inform(other, "[new tele]\n");
174 else
175 pr_inform(other, "[%d new teles]\n", np->nat_tgms);
176 }
177 }
178 }
179 }
180
181 return 0;
182 }
183