1 | /********************************************************************\ |
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2 | * BitlBee -- An IRC to other IM-networks gateway * |
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3 | * * |
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4 | * Copyright 2002-2013 Wilmer van der Gaast and others * |
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5 | \********************************************************************/ |
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6 | |
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7 | /* IRCv3 CAP command |
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8 | * |
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9 | * Specs: |
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10 | * - v3.1: http://ircv3.net/specs/core/capability-negotiation-3.1.html |
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11 | * - v3.2: http://ircv3.net/specs/core/capability-negotiation-3.2.html |
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12 | * |
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13 | * */ |
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14 | |
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15 | /* |
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16 | This program is free software; you can redistribute it and/or modify |
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17 | it under the terms of the GNU General Public License as published by |
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18 | the Free Software Foundation; either version 2 of the License, or |
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19 | (at your option) any later version. |
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20 | |
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21 | This program is distributed in the hope that it will be useful, |
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22 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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24 | GNU General Public License for more details. |
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25 | |
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26 | You should have received a copy of the GNU General Public License with |
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27 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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28 | if not, write to the Free Software Foundation, Inc., 51 Franklin St., |
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29 | Fifth Floor, Boston, MA 02110-1301 USA |
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30 | */ |
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31 | |
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32 | #include "bitlbee.h" |
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33 | |
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34 | typedef struct { |
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35 | char *name; |
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36 | irc_cap_flag_t flag; |
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37 | } cap_info_t; |
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38 | |
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39 | static const cap_info_t supported_caps[] = { |
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40 | {"sasl", CAP_SASL}, |
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41 | {"multi-prefix", CAP_MULTI_PREFIX}, |
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42 | {"extended-join", CAP_EXTENDED_JOIN}, |
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43 | {"away-notify", CAP_AWAY_NOTIFY}, |
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44 | {NULL}, |
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45 | }; |
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46 | |
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47 | static irc_cap_flag_t cap_flag_from_string(char *cap_name) |
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48 | { |
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49 | int i; |
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50 | |
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51 | if (!cap_name || !cap_name[0]) { |
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52 | return 0; |
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53 | } |
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54 | |
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55 | if (cap_name[0] == '-') { |
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56 | cap_name++; |
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57 | } |
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58 | |
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59 | for (i = 0; supported_caps[i].name; i++) { |
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60 | if (strcmp(supported_caps[i].name, cap_name) == 0) { |
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61 | return supported_caps[i].flag; |
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62 | } |
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63 | } |
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64 | return 0; |
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65 | } |
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66 | |
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67 | static gboolean irc_cmd_cap_req(irc_t *irc, char *caps) |
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68 | { |
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69 | int i; |
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70 | char *lower = NULL; |
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71 | char **split = NULL; |
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72 | irc_cap_flag_t new_caps = irc->caps; |
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73 | |
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74 | if (!caps || !caps[0]) { |
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75 | return FALSE; |
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76 | } |
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77 | |
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78 | lower = g_ascii_strdown(caps, -1); |
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79 | split = g_strsplit(lower, " ", -1); |
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80 | g_free(lower); |
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81 | |
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82 | for (i = 0; split[i]; i++) { |
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83 | gboolean remove; |
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84 | irc_cap_flag_t flag; |
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85 | |
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86 | if (!split[i][0]) { |
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87 | continue; /* skip empty items (consecutive spaces) */ |
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88 | } |
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89 | |
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90 | remove = (split[i][0] == '-'); |
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91 | flag = cap_flag_from_string(split[i]); |
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92 | |
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93 | if (!flag || (remove && !(irc->caps & flag))) { |
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94 | /* unsupported cap, or removing something that isn't there */ |
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95 | g_strfreev(split); |
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96 | return FALSE; |
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97 | } |
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98 | |
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99 | if (remove) { |
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100 | new_caps &= ~flag; |
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101 | } else { |
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102 | new_caps |= flag; |
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103 | } |
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104 | } |
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105 | |
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106 | /* if we got here, set the new caps and ack */ |
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107 | irc->caps = new_caps; |
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108 | |
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109 | g_strfreev(split); |
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110 | return TRUE; |
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111 | } |
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112 | |
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113 | /* version can be "302" or NULL, but we don't need cap-3.2 for anything yet */ |
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114 | static void irc_cmd_cap_ls(irc_t *irc, char *version) |
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115 | { |
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116 | int i; |
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117 | GString *str = g_string_sized_new(256); |
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118 | |
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119 | for (i = 0; supported_caps[i].name; i++) { |
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120 | if (i != 0) { |
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121 | g_string_append_c(str, ' '); |
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122 | } |
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123 | g_string_append(str, supported_caps[i].name); |
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124 | } |
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125 | |
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126 | irc_send_cap(irc, "LS", str->str); |
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127 | |
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128 | g_string_free(str, TRUE); |
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129 | } |
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130 | |
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131 | /* this one looks suspiciously similar to cap ls, |
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132 | * but cap-3.2 will make them very different */ |
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133 | static void irc_cmd_cap_list(irc_t *irc) |
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134 | { |
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135 | int i; |
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136 | gboolean first = TRUE; |
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137 | GString *str = g_string_sized_new(256); |
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138 | |
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139 | for (i = 0; supported_caps[i].name; i++) { |
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140 | if (irc->caps & supported_caps[i].flag) { |
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141 | if (!first) { |
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142 | g_string_append_c(str, ' '); |
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143 | } |
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144 | first = FALSE; |
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145 | |
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146 | g_string_append(str, supported_caps[i].name); |
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147 | } |
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148 | } |
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149 | |
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150 | irc_send_cap(irc, "LIST", str->str); |
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151 | |
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152 | g_string_free(str, TRUE); |
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153 | } |
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154 | |
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155 | void irc_cmd_cap(irc_t *irc, char **cmd) |
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156 | { |
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157 | if (!(irc->status & USTATUS_LOGGED_IN)) { |
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158 | /* Put registration on hold until CAP END */ |
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159 | irc->status |= USTATUS_CAP_PENDING; |
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160 | } |
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161 | |
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162 | if (g_strcasecmp(cmd[1], "LS") == 0) { |
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163 | irc_cmd_cap_ls(irc, cmd[2]); |
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164 | |
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165 | } else if (g_strcasecmp(cmd[1], "LIST") == 0) { |
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166 | irc_cmd_cap_list(irc); |
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167 | |
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168 | } else if (g_strcasecmp(cmd[1], "REQ") == 0) { |
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169 | gboolean ack = irc_cmd_cap_req(irc, cmd[2]); |
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170 | |
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171 | irc_send_cap(irc, ack ? "ACK" : "NAK", cmd[2] ? : ""); |
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172 | |
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173 | } else if (g_strcasecmp(cmd[1], "END") == 0) { |
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174 | irc->status &= ~USTATUS_CAP_PENDING; |
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175 | |
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176 | if (irc->status & USTATUS_SASL_PLAIN_PENDING) { |
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177 | irc_send_num(irc, 906, ":SASL authentication aborted"); |
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178 | irc->status &= ~USTATUS_SASL_PLAIN_PENDING; |
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179 | } |
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180 | |
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181 | irc_check_login(irc); |
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182 | |
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183 | } else { |
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184 | irc_send_num(irc, 410, "%s :Invalid CAP command", cmd[1]); |
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185 | } |
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186 | |
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187 | } |
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188 | |
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