1 | /* |
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2 | * aim_rxhandlers.c |
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3 | * |
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4 | * This file contains most all of the incoming packet handlers, along |
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5 | * with aim_rxdispatch(), the Rx dispatcher. Queue/list management is |
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6 | * actually done in aim_rxqueue.c. |
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7 | * |
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8 | */ |
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9 | |
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10 | #include <aim.h> |
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11 | |
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12 | struct aim_rxcblist_s { |
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13 | guint16 family; |
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14 | guint16 type; |
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15 | aim_rxcallback_t handler; |
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16 | u_short flags; |
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17 | struct aim_rxcblist_s *next; |
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18 | }; |
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19 | |
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20 | aim_module_t *aim__findmodulebygroup(aim_session_t *sess, guint16 group) |
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21 | { |
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22 | aim_module_t *cur; |
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23 | |
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24 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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25 | if (cur->family == group) |
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26 | return cur; |
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27 | } |
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28 | |
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29 | return NULL; |
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30 | } |
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31 | |
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32 | static aim_module_t *aim__findmodule(aim_session_t *sess, const char *name) |
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33 | { |
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34 | aim_module_t *cur; |
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35 | |
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36 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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37 | if (strcmp(name, cur->name) == 0) |
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38 | return cur; |
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39 | } |
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40 | |
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41 | return NULL; |
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42 | } |
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43 | |
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44 | int aim__registermodule(aim_session_t *sess, int (*modfirst)(aim_session_t *, aim_module_t *)) |
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45 | { |
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46 | aim_module_t *mod; |
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47 | |
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48 | if (!sess || !modfirst) |
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49 | return -1; |
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50 | |
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51 | if (!(mod = g_new0(aim_module_t,1))) |
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52 | return -1; |
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53 | |
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54 | if (modfirst(sess, mod) == -1) { |
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55 | g_free(mod); |
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56 | return -1; |
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57 | } |
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58 | |
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59 | if (aim__findmodule(sess, mod->name)) { |
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60 | if (mod->shutdown) |
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61 | mod->shutdown(sess, mod); |
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62 | g_free(mod); |
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63 | return -1; |
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64 | } |
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65 | |
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66 | mod->next = (aim_module_t *)sess->modlistv; |
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67 | sess->modlistv = mod; |
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68 | |
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69 | |
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70 | return 0; |
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71 | } |
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72 | |
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73 | void aim__shutdownmodules(aim_session_t *sess) |
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74 | { |
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75 | aim_module_t *cur; |
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76 | |
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77 | for (cur = (aim_module_t *)sess->modlistv; cur; ) { |
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78 | aim_module_t *tmp; |
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79 | |
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80 | tmp = cur->next; |
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81 | |
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82 | if (cur->shutdown) |
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83 | cur->shutdown(sess, cur); |
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84 | |
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85 | g_free(cur); |
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86 | |
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87 | cur = tmp; |
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88 | } |
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89 | |
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90 | sess->modlistv = NULL; |
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91 | |
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92 | return; |
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93 | } |
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94 | |
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95 | static int consumesnac(aim_session_t *sess, aim_frame_t *rx) |
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96 | { |
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97 | aim_module_t *cur; |
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98 | aim_modsnac_t snac; |
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99 | |
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100 | if (aim_bstream_empty(&rx->data) < 10) |
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101 | return 0; |
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102 | |
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103 | snac.family = aimbs_get16(&rx->data); |
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104 | snac.subtype = aimbs_get16(&rx->data); |
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105 | snac.flags = aimbs_get16(&rx->data); |
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106 | snac.id = aimbs_get32(&rx->data); |
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107 | |
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108 | /* Contains TLV(s) in the FNAC header */ |
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109 | if(snac.flags & 0x8000) { |
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110 | aim_bstream_advance(&rx->data, aimbs_get16(&rx->data)); |
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111 | } else if(snac.flags & 0x0001) { |
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112 | /* Following SNAC will be related */ |
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113 | } |
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114 | |
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115 | if (set_getint(sess->aux_data, "debug")) { |
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116 | serv_got_crap(sess->aux_data, "snac %x/%x received", snac.family, snac.subtype); |
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117 | } |
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118 | |
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119 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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120 | |
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121 | if (!(cur->flags & AIM_MODFLAG_MULTIFAMILY) && |
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122 | (cur->family != snac.family)) |
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123 | continue; |
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124 | |
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125 | if (cur->snachandler(sess, cur, rx, &snac, &rx->data)) |
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126 | return 1; |
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127 | |
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128 | } |
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129 | |
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130 | return 0; |
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131 | } |
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132 | |
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133 | static int consumenonsnac(aim_session_t *sess, aim_frame_t *rx, guint16 family, guint16 subtype) |
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134 | { |
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135 | aim_module_t *cur; |
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136 | aim_modsnac_t snac; |
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137 | |
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138 | snac.family = family; |
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139 | snac.subtype = subtype; |
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140 | snac.flags = snac.id = 0; |
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141 | |
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142 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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143 | |
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144 | if (!(cur->flags & AIM_MODFLAG_MULTIFAMILY) && |
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145 | (cur->family != snac.family)) |
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146 | continue; |
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147 | |
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148 | if (cur->snachandler(sess, cur, rx, &snac, &rx->data)) |
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149 | return 1; |
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150 | |
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151 | } |
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152 | |
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153 | return 0; |
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154 | } |
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155 | |
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156 | static int negchan_middle(aim_session_t *sess, aim_frame_t *fr) |
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157 | { |
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158 | aim_tlvlist_t *tlvlist; |
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159 | char *msg = NULL; |
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160 | guint16 code = 0; |
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161 | aim_rxcallback_t userfunc; |
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162 | int ret = 1; |
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163 | |
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164 | if (aim_bstream_empty(&fr->data) == 0) { |
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165 | /* XXX should do something with this */ |
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166 | return 1; |
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167 | } |
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168 | |
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169 | /* Used only by the older login protocol */ |
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170 | /* XXX remove this special case? */ |
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171 | if (fr->conn->type == AIM_CONN_TYPE_AUTH) |
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172 | return consumenonsnac(sess, fr, 0x0017, 0x0003); |
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173 | |
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174 | tlvlist = aim_readtlvchain(&fr->data); |
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175 | |
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176 | if (aim_gettlv(tlvlist, 0x0009, 1)) |
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177 | code = aim_gettlv16(tlvlist, 0x0009, 1); |
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178 | |
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179 | if (aim_gettlv(tlvlist, 0x000b, 1)) |
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180 | msg = aim_gettlv_str(tlvlist, 0x000b, 1); |
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181 | |
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182 | if ((userfunc = aim_callhandler(sess, fr->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_CONNERR))) |
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183 | ret = userfunc(sess, fr, code, msg); |
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184 | |
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185 | aim_freetlvchain(&tlvlist); |
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186 | |
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187 | g_free(msg); |
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188 | |
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189 | return ret; |
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190 | } |
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191 | |
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192 | /* |
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193 | * Some SNACs we do not allow to be hooked, for good reason. |
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194 | */ |
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195 | static int checkdisallowed(guint16 group, guint16 type) |
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196 | { |
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197 | static const struct { |
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198 | guint16 group; |
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199 | guint16 type; |
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200 | } dontuse[] = { |
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201 | {0x0001, 0x0002}, |
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202 | {0x0001, 0x0003}, |
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203 | {0x0001, 0x0006}, |
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204 | {0x0001, 0x0007}, |
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205 | {0x0001, 0x0008}, |
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206 | {0x0001, 0x0017}, |
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207 | {0x0001, 0x0018}, |
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208 | {0x0000, 0x0000} |
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209 | }; |
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210 | int i; |
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211 | |
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212 | for (i = 0; dontuse[i].group != 0x0000; i++) { |
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213 | if ((dontuse[i].group == group) && (dontuse[i].type == type)) |
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214 | return 1; |
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215 | } |
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216 | |
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217 | return 0; |
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218 | } |
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219 | |
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220 | int aim_conn_addhandler(aim_session_t *sess, aim_conn_t *conn, guint16 family, guint16 type, aim_rxcallback_t newhandler, guint16 flags) |
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221 | { |
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222 | struct aim_rxcblist_s *newcb; |
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223 | |
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224 | if (!conn) |
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225 | return -1; |
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226 | |
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227 | if (checkdisallowed(family, type)) { |
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228 | g_assert(0); |
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229 | return -1; |
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230 | } |
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231 | |
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232 | if (!(newcb = (struct aim_rxcblist_s *)g_new0(struct aim_rxcblist_s, 1))) |
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233 | return -1; |
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234 | |
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235 | newcb->family = family; |
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236 | newcb->type = type; |
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237 | newcb->flags = flags; |
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238 | newcb->handler = newhandler; |
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239 | newcb->next = NULL; |
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240 | |
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241 | if (!conn->handlerlist) |
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242 | conn->handlerlist = (void *)newcb; |
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243 | else { |
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244 | struct aim_rxcblist_s *cur; |
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245 | |
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246 | for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur->next; cur = cur->next) |
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247 | ; |
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248 | cur->next = newcb; |
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249 | } |
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250 | |
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251 | return 0; |
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252 | } |
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253 | |
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254 | int aim_clearhandlers(aim_conn_t *conn) |
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255 | { |
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256 | struct aim_rxcblist_s *cur; |
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257 | |
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258 | if (!conn) |
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259 | return -1; |
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260 | |
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261 | for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur; ) { |
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262 | struct aim_rxcblist_s *tmp; |
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263 | |
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264 | tmp = cur->next; |
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265 | g_free(cur); |
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266 | cur = tmp; |
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267 | } |
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268 | conn->handlerlist = NULL; |
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269 | |
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270 | return 0; |
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271 | } |
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272 | |
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273 | aim_rxcallback_t aim_callhandler(aim_session_t *sess, aim_conn_t *conn, guint16 family, guint16 type) |
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274 | { |
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275 | struct aim_rxcblist_s *cur; |
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276 | |
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277 | if (!conn) |
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278 | return NULL; |
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279 | |
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280 | for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur; cur = cur->next) { |
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281 | if ((cur->family == family) && (cur->type == type)) |
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282 | return cur->handler; |
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283 | } |
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284 | |
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285 | if (type == AIM_CB_SPECIAL_DEFAULT) { |
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286 | return NULL; /* prevent infinite recursion */ |
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287 | } |
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288 | |
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289 | return aim_callhandler(sess, conn, family, AIM_CB_SPECIAL_DEFAULT); |
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290 | } |
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291 | |
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292 | void aim_clonehandlers(aim_session_t *sess, aim_conn_t *dest, aim_conn_t *src) |
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293 | { |
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294 | struct aim_rxcblist_s *cur; |
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295 | |
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296 | for (cur = (struct aim_rxcblist_s *)src->handlerlist; cur; cur = cur->next) { |
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297 | aim_conn_addhandler(sess, dest, cur->family, cur->type, |
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298 | cur->handler, cur->flags); |
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299 | } |
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300 | |
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301 | return; |
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302 | } |
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303 | |
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304 | static int aim_callhandler_noparam(aim_session_t *sess, aim_conn_t *conn,guint16 family, guint16 type, aim_frame_t *ptr) |
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305 | { |
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306 | aim_rxcallback_t userfunc; |
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307 | |
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308 | if ((userfunc = aim_callhandler(sess, conn, family, type))) |
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309 | return userfunc(sess, ptr); |
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310 | |
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311 | return 1; /* XXX */ |
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312 | } |
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313 | |
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314 | /* |
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315 | * aim_rxdispatch() |
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316 | * |
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317 | * Basically, heres what this should do: |
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318 | * 1) Determine correct packet handler for this packet |
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319 | * 2) Mark the packet handled (so it can be dequeued in purge_queue()) |
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320 | * 3) Send the packet to the packet handler |
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321 | * 4) Go to next packet in the queue and start over |
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322 | * 5) When done, run purge_queue() to purge handled commands |
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323 | * |
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324 | * TODO: Clean up. |
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325 | * TODO: More support for mid-level handlers. |
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326 | * TODO: Allow for NULL handlers. |
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327 | * |
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328 | */ |
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329 | void aim_rxdispatch(aim_session_t *sess) |
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330 | { |
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331 | int i; |
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332 | aim_frame_t *cur; |
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333 | |
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334 | for (cur = sess->queue_incoming, i = 0; cur; cur = cur->next, i++) { |
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335 | |
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336 | /* |
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337 | * XXX: This is still fairly ugly. |
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338 | */ |
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339 | |
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340 | if (cur->handled) |
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341 | continue; |
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342 | |
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343 | /* |
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344 | * This is a debugging/sanity check only and probably |
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345 | * could/should be removed for stable code. |
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346 | */ |
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347 | if (((cur->hdrtype == AIM_FRAMETYPE_OFT) && |
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348 | (cur->conn->type != AIM_CONN_TYPE_RENDEZVOUS)) || |
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349 | ((cur->hdrtype == AIM_FRAMETYPE_FLAP) && |
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350 | (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS))) { |
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351 | do_error_dialog(sess->aux_data, "incompatible frame type/connection type combination", "Gaim"); |
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352 | cur->handled = 1; |
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353 | continue; |
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354 | } |
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355 | |
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356 | if (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS) { |
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357 | if (cur->hdrtype != AIM_FRAMETYPE_OFT) { |
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358 | do_error_dialog(sess->aux_data, "non-OFT frames on OFT connection", "Gaim"); |
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359 | cur->handled = 1; /* get rid of it */ |
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360 | } else { |
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361 | /* FIXME: implement this (OFT frame) */ |
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362 | cur->handled = 1; /* get rid of it */ |
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363 | } |
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364 | continue; |
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365 | } |
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366 | |
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367 | if (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS_OUT) { |
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368 | /* not possible */ |
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369 | do_error_dialog(sess->aux_data, "RENDEZVOUS packet in rxqueue", "Gaim"); |
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370 | cur->handled = 1; |
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371 | continue; |
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372 | } |
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373 | |
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374 | if (cur->hdr.flap.type == 0x01) { |
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375 | |
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376 | cur->handled = aim_callhandler_noparam(sess, cur->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_FLAPVER, cur); /* XXX use consumenonsnac */ |
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377 | |
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378 | continue; |
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379 | |
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380 | } else if (cur->hdr.flap.type == 0x02) { |
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381 | |
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382 | if ((cur->handled = consumesnac(sess, cur))) |
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383 | continue; |
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384 | |
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385 | } else if (cur->hdr.flap.type == 0x04) { |
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386 | |
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387 | cur->handled = negchan_middle(sess, cur); |
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388 | continue; |
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389 | |
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390 | } else if (cur->hdr.flap.type == 0x05) |
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391 | ; |
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392 | |
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393 | if (!cur->handled) { |
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394 | consumenonsnac(sess, cur, 0xffff, 0xffff); /* last chance! */ |
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395 | cur->handled = 1; |
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396 | } |
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397 | } |
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398 | |
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399 | /* |
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400 | * This doesn't have to be called here. It could easily be done |
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401 | * by a seperate thread or something. It's an administrative operation, |
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402 | * and can take a while. Though the less you call it the less memory |
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403 | * you'll have :) |
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404 | */ |
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405 | aim_purge_rxqueue(sess); |
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406 | |
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407 | return; |
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408 | } |
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