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annotate plugins/links/links.c @ 1091:52be05336310

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irccdctl: misc cleanups
author David Demelier <markand@malikania.fr>
date Wed, 21 Jul 2021 16:06:36 +0200
parents 8f26ee9cc6dd
children ae8b91ec4e4a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * links.c -- links plugin
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3 *
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4 * Copyright (c) 2013-2021 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <ctype.h>
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21 #include <errno.h>
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22 #include <pthread.h>
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23 #include <regex.h>
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <curl/curl.h>
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29
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30 #include <irccd/config.h>
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31 #include <irccd/irccd.h>
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32 #include <irccd/limits.h>
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33 #include <irccd/server.h>
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34 #include <irccd/subst.h>
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35 #include <irccd/util.h>
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36
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37 /*
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38 * Since most websites are now bloated, we need a very large page size to
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39 * analyse. Use 5MB for now.
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40 */
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41 #define PAGE_MAX 5242880
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42
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43 struct req {
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44 pthread_t thr;
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45 CURL *curl;
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46 struct irc_server *server;
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47 int status;
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48 char *link;
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49 char *chan;
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50 char *nickname;
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51 char *origin;
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52 FILE *fp;
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53 char buf[];
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54 };
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55
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56 enum {
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57 TPL_INFO
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58 };
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59
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60 static unsigned long timeout = 30;
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61
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62 static char templates[][512] = {
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63 [TPL_INFO] = "link from #{nickname}: #{title}"
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64 };
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65
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66 static const struct {
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67 const char *key;
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68 int repl;
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69 } entities[] = {
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70 { "quot", '"' },
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71 { "amp", '&' },
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72 { "apos", '\'' },
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73 { "lt", '<' },
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74 { "gt", '>' },
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75 { NULL, 0 }
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76 };
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77
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78 static size_t
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79 callback(char *ptr, size_t size, size_t nmemb, struct req *req)
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80 {
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81 fprintf(req->fp, "%.*s", (int)(size * nmemb), ptr);
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82
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83 if (feof(req->fp) || ferror(req->fp))
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84 return 0;
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85
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86 return size * nmemb;
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87 }
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88
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89 static char *
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90 parse(struct req *req)
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91 {
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92 regex_t regex;
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93 regmatch_t match[2];
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94 char *ret = NULL;
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95
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96 if (regcomp(&regex, "<title>([^<]+)<\\/title>", REG_EXTENDED | REG_ICASE) != 0)
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97 return NULL;
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98
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99 if (regexec(&regex, req->buf, 2, match, 0) == 0) {
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100 ret = &req->buf[match[1].rm_so];
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101 ret[match[1].rm_eo - match[1].rm_so] = '\0';
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102 }
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103
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104 regfree(&regex);
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105
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106 return ret;
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107 }
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108
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109 static int
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110 find_entity(const char *key)
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111 {
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112 for (size_t i = 0; entities[i].key; ++i)
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113 if (strcmp(entities[i].key, key) == 0)
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114 return entities[i].repl;
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115
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116 return EOF;
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117 }
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118
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119 static const char *
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120 untitle(char *title)
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121 {
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122 static char ret[256] = {0};
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123 char *save;
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124 int repl;
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125 FILE *fp = NULL;
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126
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127 if (!(fp = fmemopen(ret, sizeof (ret) - 1, "w")))
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128 goto fallback;
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129
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130 for (char *p = title; *p; ) {
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131 /* Standard character. */
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132 if (*p != '&') {
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133 if (fputc(*p++, fp) == EOF)
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134 goto fallback;
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135
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136 continue;
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137 }
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138
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139 /* HTML entity. */
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140 save = ++p;
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141
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142 while (*p && *p != ';')
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143 ++p;
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144
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145 /* Found an entity. */
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146 if (*p == ';') {
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147 *p++ = '\0';
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148
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149 if ((repl = find_entity(save)) != EOF)
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150 fputc(repl, fp);
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151 }
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152 }
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153
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154 fclose(fp);
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155
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156 return ret;
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157
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158 fallback:
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159 if (fp)
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160 fclose(fp);
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161
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parents: 1031
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162 return title;
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parents: 1031
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163 }
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diff changeset
164
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diff changeset
165 static const char *
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166 fmt(const struct req *req, char *title)
987
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167 {
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168 static char line[IRC_MESSAGE_LEN];
1033
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169
987
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170 struct irc_subst subst = {
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171 .time = time(NULL),
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David Demelier <markand@malikania.fr>
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172 .flags = IRC_SUBST_DATE | IRC_SUBST_KEYWORDS | IRC_SUBST_IRC_ATTRS,
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173 .keywords = (struct irc_subst_keyword []) {
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parents:
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174 { "channel", req->chan },
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175 { "nickname", req->nickname },
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176 { "origin", req->origin },
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177 { "server", req->server->name },
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178 { "title", untitle(title) }
987
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179 },
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180 .keywordsz = 5
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181 };
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182
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183 irc_subst(line, sizeof (line), templates[TPL_INFO], &subst);
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parents:
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184
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185 return line;
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parents:
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186 }
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187
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188 static void
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189 req_finish(struct req *);
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190
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191 static void
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192 complete(struct req *req)
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193 {
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194 char *title;
987
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195
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196 if (req->status && (title = parse(req)))
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197 irc_server_message(req->server, req->chan, fmt(req, title));
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198
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199 pthread_join(req->thr, NULL);
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200 req_finish(req);
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201 }
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202
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David Demelier <markand@malikania.fr>
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203 /*
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parents:
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204 * This function is running in a separate thread.
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205 */
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206 static void *
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207 routine(struct req *req)
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208 {
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209 typedef void (*func_t)(void *);
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210
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211 if (curl_easy_perform(req->curl) == 0)
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212 req->status = 1;
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diff changeset
213
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214 irc_bot_post((func_t)complete, req);
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215
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216 return NULL;
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parents:
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217 }
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parents:
diff changeset
218
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219 static void
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diff changeset
220 req_finish(struct req *req)
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parents:
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221 {
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diff changeset
222 assert(req);
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diff changeset
223
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224 if (req->server)
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225 irc_server_decref(req->server);
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diff changeset
226 if (req->curl)
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diff changeset
227 curl_easy_cleanup(req->curl);
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diff changeset
228 if (req->fp)
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229 fclose(req->fp);
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diff changeset
230
1007
936cbd66b4b8 plugin links: fix a leak
David Demelier <markand@malikania.fr>
parents: 992
diff changeset
231 free(req->link);
987
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diff changeset
232 free(req->chan);
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diff changeset
233 free(req->nickname);
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diff changeset
234 free(req->origin);
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diff changeset
235 free(req);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
236 }
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parents:
diff changeset
237
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diff changeset
238 static struct req *
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diff changeset
239 req_new(struct irc_server *server, const char *origin, const char *channel, char *link)
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parents:
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240 {
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241 assert(link);
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242
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diff changeset
243 struct req *req;
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diff changeset
244 struct irc_server_user user;
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245
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246 if (!(req = calloc(1, sizeof (*req) + PAGE_MAX + 1))) {
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247 free(link);
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248 return NULL;
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parents:
diff changeset
249 }
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David Demelier <markand@malikania.fr>
parents:
diff changeset
250 if (!(req->curl = curl_easy_init()))
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David Demelier <markand@malikania.fr>
parents:
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251 goto enomem;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
252 if (!(req->fp = fmemopen(req->buf, PAGE_MAX, "w")))
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David Demelier <markand@malikania.fr>
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253 goto enomem;
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David Demelier <markand@malikania.fr>
parents:
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254
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255 irc_server_incref(server);
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David Demelier <markand@malikania.fr>
parents:
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256 irc_server_split(origin, &user);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
257 req->link = link;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
258 req->server = server;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
259 req->chan = strdup(channel);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
260 req->nickname = strdup(user.nickname);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
261 req->origin = strdup(origin);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
262
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David Demelier <markand@malikania.fr>
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diff changeset
263 curl_easy_setopt(req->curl, CURLOPT_URL, link);
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parents:
diff changeset
264 curl_easy_setopt(req->curl, CURLOPT_FOLLOWLOCATION, 1L);
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diff changeset
265 curl_easy_setopt(req->curl, CURLOPT_WRITEFUNCTION, callback);
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266 curl_easy_setopt(req->curl, CURLOPT_WRITEDATA, req);
990
daaf92c097e6 plugin links: add timeout support
David Demelier <markand@malikania.fr>
parents: 988
diff changeset
267 curl_easy_setopt(req->curl, CURLOPT_TIMEOUT, timeout);
987
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parents:
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268
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269 return req;
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parents:
diff changeset
270
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parents:
diff changeset
271 enomem:
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parents:
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272 errno = ENOMEM;
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diff changeset
273 req_finish(req);
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parents:
diff changeset
274
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parents:
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275 return NULL;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
276 }
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David Demelier <markand@malikania.fr>
parents:
diff changeset
277
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parents:
diff changeset
278 static void
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parents:
diff changeset
279 req_start(struct req *req)
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parents:
diff changeset
280 {
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parents:
diff changeset
281 typedef void *(*func_t)(void *);
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282
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diff changeset
283 if (pthread_create(&req->thr, NULL, (func_t)routine, req) != 0)
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parents:
diff changeset
284 req_finish(req);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
285 }
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parents:
diff changeset
286
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David Demelier <markand@malikania.fr>
parents:
diff changeset
287 void
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parents:
diff changeset
288 links_event(const struct irc_event *ev)
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David Demelier <markand@malikania.fr>
parents:
diff changeset
289 {
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David Demelier <markand@malikania.fr>
parents:
diff changeset
290 struct req *req;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
291 char *loc, *link, *end;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
292
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David Demelier <markand@malikania.fr>
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diff changeset
293 if (ev->type != IRC_EVENT_MESSAGE)
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David Demelier <markand@malikania.fr>
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294 return;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
295
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David Demelier <markand@malikania.fr>
parents:
diff changeset
296 /* Parse link. */
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David Demelier <markand@malikania.fr>
parents:
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297 if (!(loc = strstr(ev->message.message, "http://")) &&
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David Demelier <markand@malikania.fr>
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298 !(loc = strstr(ev->message.message, "https://")))
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David Demelier <markand@malikania.fr>
parents:
diff changeset
299 return;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
300
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David Demelier <markand@malikania.fr>
parents:
diff changeset
301 /* Compute end to allocate only what's needed. */
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David Demelier <markand@malikania.fr>
parents:
diff changeset
302 for (end = loc; *end && !isspace(*end); )
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David Demelier <markand@malikania.fr>
parents:
diff changeset
303 ++end;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
304
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David Demelier <markand@malikania.fr>
parents:
diff changeset
305 link = irc_util_strndup(loc, end - loc);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
306
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
307 /* If the function fails, link is free'd anyway. */
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David Demelier <markand@malikania.fr>
parents:
diff changeset
308 if (!(req = req_new(ev->server, ev->message.origin, ev->message.channel, link)))
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David Demelier <markand@malikania.fr>
parents:
diff changeset
309 return;
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
310
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
311 req_start(req);
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David Demelier <markand@malikania.fr>
parents:
diff changeset
312 }
685b85367c8e plugin logger: resurrect
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parents:
diff changeset
313
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
314 void
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David Demelier <markand@malikania.fr>
parents:
diff changeset
315 links_set_template(const char *key, const char *value)
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David Demelier <markand@malikania.fr>
parents:
diff changeset
316 {
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David Demelier <markand@malikania.fr>
parents:
diff changeset
317 if (strcmp(key, "info") == 0)
1079
8f26ee9cc6dd misc: unconditionnally add BSD->POSIX extensions
David Demelier <markand@malikania.fr>
parents: 1065
diff changeset
318 irc_util_strlcpy(templates[TPL_INFO], value, sizeof (templates[TPL_INFO]));
987
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parents:
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319 }
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
320
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David Demelier <markand@malikania.fr>
parents:
diff changeset
321 const char *
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David Demelier <markand@malikania.fr>
parents:
diff changeset
322 links_get_template(const char *key)
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David Demelier <markand@malikania.fr>
parents:
diff changeset
323 {
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David Demelier <markand@malikania.fr>
parents:
diff changeset
324 if (strcmp(key, "info") == 0)
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David Demelier <markand@malikania.fr>
parents:
diff changeset
325 return templates[TPL_INFO];
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David Demelier <markand@malikania.fr>
parents:
diff changeset
326
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
327 return NULL;
685b85367c8e plugin logger: resurrect
David Demelier <markand@malikania.fr>
parents:
diff changeset
328 }
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329
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330 const char **
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331 links_get_templates(void)
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332 {
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333 static const char *keys[] = { "info", NULL };
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334
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335 return keys;
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336 }
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337
990
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338 void
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339 links_set_option(const char *key, const char *value)
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340 {
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341 if (strcmp(key, "timeout") == 0)
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342 timeout = atol(value);
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343 }
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344
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345 const char *
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346 links_get_option(const char *key)
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347 {
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348 static char out[32];
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349
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350 if (strcmp(key, "timeout") == 0) {
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351 snprintf(out, sizeof (out), "%lu", timeout);
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352 return out;
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353 }
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354
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355 return NULL;
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356 }
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357
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358 const char **
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359 links_get_options(void)
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360 {
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361 static const char *keys[] = { "timeout", NULL };
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362
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363 return keys;
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364 }
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365
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366 const char *links_description = "Parse links from messages";
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367 const char *links_version = IRCCD_VERSION;
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368 const char *links_license = "ISC";
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369 const char *links_author = "David Demelier <markand@malikania.fr>";