[355e2ad] | 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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[58b63de6] | 40 | {"sasl", CAP_SASL}, |
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[687ec88] | 41 | {"multi-prefix", CAP_MULTI_PREFIX}, |
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[d63f37c] | 42 | {"extended-join", CAP_EXTENDED_JOIN}, |
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[80c2f3c] | 43 | {"away-notify", CAP_AWAY_NOTIFY}, |
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[c54bb11] | 44 | {"userhost-in-names", CAP_USERHOST_IN_NAMES}, |
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[f7cc734] | 45 | {"server-time", CAP_SERVER_TIME}, |
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[355e2ad] | 46 | {NULL}, |
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| 47 | }; |
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| 48 | |
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| 49 | static irc_cap_flag_t cap_flag_from_string(char *cap_name) |
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| 50 | { |
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| 51 | int i; |
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| 52 | |
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| 53 | if (!cap_name || !cap_name[0]) { |
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| 54 | return 0; |
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| 55 | } |
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| 56 | |
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| 57 | if (cap_name[0] == '-') { |
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| 58 | cap_name++; |
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| 59 | } |
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| 60 | |
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| 61 | for (i = 0; supported_caps[i].name; i++) { |
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| 62 | if (strcmp(supported_caps[i].name, cap_name) == 0) { |
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| 63 | return supported_caps[i].flag; |
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| 64 | } |
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| 65 | } |
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| 66 | return 0; |
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| 67 | } |
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| 68 | |
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| 69 | static gboolean irc_cmd_cap_req(irc_t *irc, char *caps) |
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| 70 | { |
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| 71 | int i; |
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| 72 | char *lower = NULL; |
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| 73 | char **split = NULL; |
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| 74 | irc_cap_flag_t new_caps = irc->caps; |
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| 75 | |
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| 76 | if (!caps || !caps[0]) { |
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| 77 | return FALSE; |
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| 78 | } |
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| 79 | |
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| 80 | lower = g_ascii_strdown(caps, -1); |
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| 81 | split = g_strsplit(lower, " ", -1); |
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| 82 | g_free(lower); |
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| 83 | |
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| 84 | for (i = 0; split[i]; i++) { |
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| 85 | gboolean remove; |
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| 86 | irc_cap_flag_t flag; |
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| 87 | |
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| 88 | if (!split[i][0]) { |
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| 89 | continue; /* skip empty items (consecutive spaces) */ |
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| 90 | } |
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| 91 | |
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| 92 | remove = (split[i][0] == '-'); |
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| 93 | flag = cap_flag_from_string(split[i]); |
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| 94 | |
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| 95 | if (!flag || (remove && !(irc->caps & flag))) { |
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| 96 | /* unsupported cap, or removing something that isn't there */ |
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| 97 | g_strfreev(split); |
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| 98 | return FALSE; |
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| 99 | } |
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| 100 | |
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| 101 | if (remove) { |
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| 102 | new_caps &= ~flag; |
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| 103 | } else { |
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| 104 | new_caps |= flag; |
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| 105 | } |
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| 106 | } |
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| 107 | |
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| 108 | /* if we got here, set the new caps and ack */ |
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| 109 | irc->caps = new_caps; |
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| 110 | |
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| 111 | g_strfreev(split); |
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| 112 | return TRUE; |
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| 113 | } |
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| 114 | |
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[8fdeaa5] | 115 | /* version can be 0, 302, 303, or garbage from user input. thanks user input */ |
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| 116 | static void irc_cmd_cap_ls(irc_t *irc, long version) |
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[355e2ad] | 117 | { |
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| 118 | int i; |
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| 119 | GString *str = g_string_sized_new(256); |
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| 120 | |
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| 121 | for (i = 0; supported_caps[i].name; i++) { |
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| 122 | if (i != 0) { |
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| 123 | g_string_append_c(str, ' '); |
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| 124 | } |
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| 125 | g_string_append(str, supported_caps[i].name); |
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[8fdeaa5] | 126 | |
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| 127 | if (version >= 302 && supported_caps[i].flag == CAP_SASL) { |
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| 128 | g_string_append(str, "=PLAIN"); |
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| 129 | } |
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[355e2ad] | 130 | } |
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| 131 | |
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| 132 | irc_send_cap(irc, "LS", str->str); |
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| 133 | |
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| 134 | g_string_free(str, TRUE); |
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| 135 | } |
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| 136 | |
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| 137 | /* this one looks suspiciously similar to cap ls, |
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| 138 | * but cap-3.2 will make them very different */ |
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| 139 | static void irc_cmd_cap_list(irc_t *irc) |
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| 140 | { |
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| 141 | int i; |
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| 142 | gboolean first = TRUE; |
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| 143 | GString *str = g_string_sized_new(256); |
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| 144 | |
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| 145 | for (i = 0; supported_caps[i].name; i++) { |
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| 146 | if (irc->caps & supported_caps[i].flag) { |
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| 147 | if (!first) { |
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| 148 | g_string_append_c(str, ' '); |
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| 149 | } |
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| 150 | first = FALSE; |
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| 151 | |
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| 152 | g_string_append(str, supported_caps[i].name); |
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| 153 | } |
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| 154 | } |
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| 155 | |
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| 156 | irc_send_cap(irc, "LIST", str->str); |
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| 157 | |
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| 158 | g_string_free(str, TRUE); |
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| 159 | } |
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| 160 | |
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| 161 | void irc_cmd_cap(irc_t *irc, char **cmd) |
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| 162 | { |
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| 163 | if (!(irc->status & USTATUS_LOGGED_IN)) { |
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| 164 | /* Put registration on hold until CAP END */ |
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| 165 | irc->status |= USTATUS_CAP_PENDING; |
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| 166 | } |
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| 167 | |
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| 168 | if (g_strcasecmp(cmd[1], "LS") == 0) { |
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[8fdeaa5] | 169 | irc_cmd_cap_ls(irc, cmd[2] ? strtol(cmd[2], NULL, 10) : 0); |
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[355e2ad] | 170 | |
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| 171 | } else if (g_strcasecmp(cmd[1], "LIST") == 0) { |
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| 172 | irc_cmd_cap_list(irc); |
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| 173 | |
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| 174 | } else if (g_strcasecmp(cmd[1], "REQ") == 0) { |
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| 175 | gboolean ack = irc_cmd_cap_req(irc, cmd[2]); |
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| 176 | |
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| 177 | irc_send_cap(irc, ack ? "ACK" : "NAK", cmd[2] ? : ""); |
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| 178 | |
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| 179 | } else if (g_strcasecmp(cmd[1], "END") == 0) { |
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[c9603a3] | 180 | if (!(irc->status & USTATUS_CAP_PENDING)) { |
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| 181 | return; |
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| 182 | } |
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[355e2ad] | 183 | irc->status &= ~USTATUS_CAP_PENDING; |
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[58b63de6] | 184 | |
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| 185 | if (irc->status & USTATUS_SASL_PLAIN_PENDING) { |
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| 186 | irc_send_num(irc, 906, ":SASL authentication aborted"); |
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| 187 | irc->status &= ~USTATUS_SASL_PLAIN_PENDING; |
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| 188 | } |
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| 189 | |
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[355e2ad] | 190 | irc_check_login(irc); |
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| 191 | |
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| 192 | } else { |
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| 193 | irc_send_num(irc, 410, "%s :Invalid CAP command", cmd[1]); |
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| 194 | } |
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| 195 | |
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| 196 | } |
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| 197 | |
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