1 | /* |
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2 | * txqueue.c |
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3 | * |
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4 | * Herein lies all the mangement routines for the transmit (Tx) queue. |
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5 | * |
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6 | */ |
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7 | |
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8 | #define FAIM_INTERNAL |
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9 | #include <aim.h> |
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10 | |
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11 | #ifndef _WIN32 |
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12 | #include <sys/socket.h> |
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13 | #else |
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14 | #include "win32dep.h" |
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15 | #endif |
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16 | |
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17 | /* |
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18 | * Allocate a new tx frame. |
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19 | * |
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20 | * This is more for looks than anything else. |
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21 | * |
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22 | * Right now, that is. If/when we implement a pool of transmit |
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23 | * frames, this will become the request-an-unused-frame part. |
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24 | * |
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25 | * framing = AIM_FRAMETYPE_OFT/FLAP |
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26 | * chan = channel for FLAP, hdrtype for OFT |
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27 | * |
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28 | */ |
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29 | faim_internal aim_frame_t *aim_tx_new(aim_session_t *sess, aim_conn_t *conn, fu8_t framing, fu16_t chan, int datalen) |
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30 | { |
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31 | aim_frame_t *fr; |
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32 | |
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33 | if (!conn) { |
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34 | faimdprintf(sess, 0, "aim_tx_new: ERROR: no connection specified\n"); |
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35 | return NULL; |
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36 | } |
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37 | |
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38 | /* For sanity... */ |
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39 | if ((conn->type == AIM_CONN_TYPE_RENDEZVOUS) || (conn->type == AIM_CONN_TYPE_LISTENER)) { |
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40 | if (framing != AIM_FRAMETYPE_OFT) { |
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41 | faimdprintf(sess, 0, "aim_tx_new: attempted to allocate inappropriate frame type for rendezvous connection\n"); |
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42 | return NULL; |
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43 | } |
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44 | } else { |
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45 | if (framing != AIM_FRAMETYPE_FLAP) { |
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46 | faimdprintf(sess, 0, "aim_tx_new: attempted to allocate inappropriate frame type for FLAP connection\n"); |
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47 | return NULL; |
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48 | } |
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49 | } |
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50 | |
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51 | if (!(fr = (aim_frame_t *)malloc(sizeof(aim_frame_t)))) return NULL; |
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52 | memset(fr, 0, sizeof(aim_frame_t)); |
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53 | |
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54 | fr->conn = conn; |
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55 | fr->hdrtype = framing; |
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56 | if (fr->hdrtype == AIM_FRAMETYPE_FLAP) { |
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57 | fr->hdr.flap.type = chan; |
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58 | } else if (fr->hdrtype == AIM_FRAMETYPE_OFT) { |
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59 | fr->hdr.rend.type = chan; |
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60 | } else { |
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61 | faimdprintf(sess, 0, "tx_new: unknown framing\n"); |
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62 | } |
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63 | |
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64 | if (datalen > 0) { |
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65 | fu8_t *data; |
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66 | if (!(data = (unsigned char *)malloc(datalen))) { |
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67 | aim_frame_destroy(fr); |
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68 | return NULL; |
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69 | } |
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70 | aim_bstream_init(&fr->data, data, datalen); |
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71 | } |
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72 | |
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73 | return fr; |
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74 | } |
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75 | |
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76 | /* |
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77 | * aim_tx_enqeue__queuebased() |
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78 | * |
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79 | * The overall purpose here is to enqueue the passed in command struct |
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80 | * into the outgoing (tx) queue. Basically... |
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81 | * 1) Make a scope-irrelevent copy of the struct |
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82 | * 3) Mark as not-sent-yet |
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83 | * 4) Enqueue the struct into the list |
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84 | * 6) Return |
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85 | * |
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86 | * Note that this is only used when doing queue-based transmitting; |
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87 | * that is, when sess->tx_enqueue is set to &aim_tx_enqueue__queuebased. |
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88 | * |
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89 | */ |
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90 | static int aim_tx_enqueue__queuebased(aim_session_t *sess, aim_frame_t *fr) |
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91 | { |
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92 | |
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93 | if (!fr->conn) { |
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94 | faimdprintf(sess, 1, "aim_tx_enqueue: WARNING: enqueueing packet with no connecetion\n"); |
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95 | fr->conn = aim_getconn_type(sess, AIM_CONN_TYPE_BOS); |
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96 | } |
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97 | |
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98 | if (fr->hdrtype == AIM_FRAMETYPE_FLAP) { |
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99 | /* assign seqnum -- XXX should really not assign until hardxmit */ |
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100 | fr->hdr.flap.seqnum = aim_get_next_txseqnum(fr->conn); |
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101 | } |
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102 | |
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103 | fr->handled = 0; /* not sent yet */ |
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104 | |
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105 | /* see overhead note in aim_rxqueue counterpart */ |
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106 | if (!sess->queue_outgoing) |
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107 | sess->queue_outgoing = fr; |
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108 | else { |
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109 | aim_frame_t *cur; |
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110 | |
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111 | for (cur = sess->queue_outgoing; cur->next; cur = cur->next) |
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112 | ; |
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113 | cur->next = fr; |
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114 | } |
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115 | |
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116 | return 0; |
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117 | } |
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118 | |
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119 | /* |
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120 | * aim_tx_enqueue__immediate() |
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121 | * |
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122 | * Parallel to aim_tx_enqueue__queuebased, however, this bypasses |
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123 | * the whole queue mess when you want immediate writes to happen. |
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124 | * |
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125 | * Basically the same as its __queuebased couterpart, however |
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126 | * instead of doing a list append, it just calls aim_tx_sendframe() |
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127 | * right here. |
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128 | * |
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129 | */ |
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130 | static int aim_tx_enqueue__immediate(aim_session_t *sess, aim_frame_t *fr) |
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131 | { |
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132 | |
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133 | if (!fr->conn) { |
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134 | faimdprintf(sess, 1, "aim_tx_enqueue: ERROR: packet has no connection\n"); |
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135 | aim_frame_destroy(fr); |
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136 | return 0; |
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137 | } |
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138 | |
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139 | if (fr->hdrtype == AIM_FRAMETYPE_FLAP) fr->hdr.flap.seqnum = aim_get_next_txseqnum(fr->conn); |
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140 | fr->handled = 0; /* not sent yet */ |
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141 | aim_tx_sendframe(sess, fr); |
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142 | aim_frame_destroy(fr); |
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143 | |
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144 | return 0; |
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145 | } |
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146 | |
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147 | faim_export int aim_tx_setenqueue(aim_session_t *sess, int what, int (*func)(aim_session_t *, aim_frame_t *)) |
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148 | { |
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149 | if (what == AIM_TX_QUEUED) { |
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150 | sess->tx_enqueue = &aim_tx_enqueue__queuebased; |
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151 | } else if (what == AIM_TX_IMMEDIATE) { |
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152 | sess->tx_enqueue = &aim_tx_enqueue__immediate; |
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153 | } else if (what == AIM_TX_USER) { |
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154 | if (!func) return -EINVAL; |
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155 | sess->tx_enqueue = func; |
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156 | } else { |
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157 | return -EINVAL; /* unknown action */ |
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158 | } |
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159 | |
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160 | return 0; |
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161 | } |
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162 | |
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163 | faim_internal int aim_tx_enqueue(aim_session_t *sess, aim_frame_t *fr) |
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164 | { |
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165 | |
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166 | /* |
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167 | * If we want to send a connection thats inprogress, we have to force |
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168 | * them to use the queue based version. Otherwise, use whatever they |
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169 | * want. |
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170 | */ |
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171 | if (fr && fr->conn && |
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172 | (fr->conn->status & AIM_CONN_STATUS_INPROGRESS)) { |
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173 | return aim_tx_enqueue__queuebased(sess, fr); |
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174 | } |
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175 | |
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176 | return (*sess->tx_enqueue)(sess, fr); |
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177 | } |
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178 | |
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179 | /* |
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180 | * aim_get_next_txseqnum() |
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181 | * |
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182 | * This increments the tx command count, and returns the seqnum |
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183 | * that should be stamped on the next FLAP packet sent. This is |
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184 | * normally called during the final step of packet preparation |
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185 | * before enqueuement (in aim_tx_enqueue()). |
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186 | * |
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187 | */ |
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188 | faim_internal flap_seqnum_t aim_get_next_txseqnum(aim_conn_t *conn) |
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189 | { |
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190 | flap_seqnum_t ret; |
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191 | ret = ++conn->seqnum; |
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192 | return ret; |
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193 | } |
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194 | |
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195 | static int aim_send(int fd, const void *buf, size_t count) |
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196 | { |
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197 | int left, cur; |
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198 | |
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199 | for (cur = 0, left = count; left; ) { |
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200 | int ret; |
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201 | |
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202 | ret = send(fd, ((unsigned char *)buf)+cur, left, 0); |
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203 | if (ret == -1) { |
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204 | return -1; |
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205 | } else if (ret == 0) { |
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206 | return cur; |
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207 | } |
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208 | |
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209 | cur += ret; |
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210 | left -= ret; |
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211 | } |
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212 | |
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213 | return cur; |
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214 | } |
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215 | |
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216 | static int aim_bstream_send(aim_bstream_t *bs, aim_conn_t *conn, size_t count) |
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217 | { |
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218 | int wrote = 0; |
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219 | int rv = 0; |
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220 | if (!bs || !conn || (count < 0)) |
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221 | return -EINVAL; |
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222 | |
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223 | if (count > aim_bstream_empty(bs)) |
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224 | count = aim_bstream_empty(bs); /* truncate to remaining space */ |
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225 | |
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226 | if (count) { |
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227 | if ((conn->type == AIM_CONN_TYPE_RENDEZVOUS) && |
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228 | (conn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM)) { |
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229 | /* I strongly suspect that this is a horrible thing to do |
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230 | * and I feel really guilty doing it. */ |
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231 | const char *sn = aim_odc_getsn(conn); |
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232 | aim_rxcallback_t userfunc; |
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233 | while (count - wrote > 1024) { |
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234 | rv = aim_send(conn->fd, bs->data + bs->offset + wrote, 1024); |
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235 | if (rv < 0) { |
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236 | fprintf(stderr, "aim_bstream_send: aim_send failed...\n"); |
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237 | return -EINVAL; |
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238 | } |
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239 | wrote = wrote + rv; |
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240 | |
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241 | if ((userfunc=aim_callhandler(conn->sessv, conn, |
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242 | AIM_CB_FAM_SPECIAL, |
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243 | AIM_CB_SPECIAL_IMAGETRANSFER))) |
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244 | userfunc(conn->sessv, NULL, sn, |
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245 | count-wrote>1024 ? ((double)wrote / count) : 1); |
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246 | } |
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247 | } |
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248 | if (count - wrote) { |
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249 | rv = aim_send(conn->fd, bs->data + bs->offset + wrote, count - wrote); |
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250 | if (rv < 0) { |
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251 | fprintf(stderr, "aim_bstream_send: aim_send failed...\n"); |
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252 | return -EINVAL; |
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253 | } |
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254 | wrote = wrote + rv; |
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255 | } |
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256 | |
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257 | } |
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258 | |
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259 | if (((aim_session_t *)conn->sessv)->debug >= 2) { |
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260 | int i; |
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261 | aim_session_t *sess = (aim_session_t *)conn->sessv; |
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262 | |
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263 | faimdprintf(sess, 2, "\nOutgoing data: (%d bytes)", wrote); |
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264 | for (i = 0; i < wrote; i++) { |
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265 | if (!(i % 8)) |
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266 | faimdprintf(sess, 2, "\n\t"); |
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267 | faimdprintf(sess, 2, "0x%02x ", *(bs->data + bs->offset + i)); |
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268 | } |
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269 | faimdprintf(sess, 2, "\n"); |
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270 | } |
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271 | |
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272 | bs->offset += wrote; |
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273 | |
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274 | return wrote; |
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275 | } |
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276 | |
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277 | static int sendframe_flap(aim_session_t *sess, aim_frame_t *fr) |
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278 | { |
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279 | aim_bstream_t obs; |
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280 | fu8_t *obs_raw; |
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281 | int payloadlen, err = 0, obslen; |
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282 | |
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283 | payloadlen = aim_bstream_curpos(&fr->data); |
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284 | |
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285 | if (!(obs_raw = malloc(6 + payloadlen))) |
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286 | return -ENOMEM; |
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287 | |
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288 | aim_bstream_init(&obs, obs_raw, 6 + payloadlen); |
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289 | |
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290 | /* FLAP header */ |
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291 | aimbs_put8(&obs, 0x2a); |
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292 | aimbs_put8(&obs, fr->hdr.flap.type); |
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293 | aimbs_put16(&obs, fr->hdr.flap.seqnum); |
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294 | aimbs_put16(&obs, payloadlen); |
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295 | |
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296 | /* payload */ |
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297 | aim_bstream_rewind(&fr->data); |
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298 | aimbs_putbs(&obs, &fr->data, payloadlen); |
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299 | |
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300 | obslen = aim_bstream_curpos(&obs); |
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301 | aim_bstream_rewind(&obs); |
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302 | if (aim_bstream_send(&obs, fr->conn, obslen) != obslen) |
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303 | err = -errno; |
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304 | |
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305 | free(obs_raw); /* XXX aim_bstream_free */ |
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306 | |
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307 | fr->handled = 1; |
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308 | fr->conn->lastactivity = time(NULL); |
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309 | |
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310 | return err; |
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311 | } |
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312 | |
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313 | static int sendframe_rendezvous(aim_session_t *sess, aim_frame_t *fr) |
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314 | { |
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315 | aim_bstream_t bs; |
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316 | fu8_t *bs_raw; |
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317 | int err = 0; |
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318 | int totlen = 8 + aim_bstream_curpos(&fr->data); |
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319 | |
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320 | if (!(bs_raw = malloc(totlen))) |
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321 | return -1; |
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322 | |
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323 | aim_bstream_init(&bs, bs_raw, totlen); |
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324 | |
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325 | aimbs_putraw(&bs, fr->hdr.rend.magic, 4); |
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326 | aimbs_put16(&bs, 8 + fr->hdr.rend.hdrlen); |
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327 | aimbs_put16(&bs, fr->hdr.rend.type); |
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328 | |
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329 | /* payload */ |
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330 | aim_bstream_rewind(&fr->data); |
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331 | aimbs_putbs(&bs, &fr->data, totlen - 8); |
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332 | |
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333 | aim_bstream_rewind(&bs); |
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334 | |
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335 | if (aim_bstream_send(&bs, fr->conn, totlen) != totlen) |
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336 | err = -errno; |
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337 | |
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338 | free(bs_raw); /* XXX aim_bstream_free */ |
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339 | |
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340 | fr->handled = 1; |
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341 | fr->conn->lastactivity = time(NULL); |
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342 | |
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343 | return err; |
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344 | } |
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345 | |
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346 | faim_internal int aim_tx_sendframe(aim_session_t *sess, aim_frame_t *fr) |
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347 | { |
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348 | if (fr->hdrtype == AIM_FRAMETYPE_FLAP) |
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349 | return sendframe_flap(sess, fr); |
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350 | else if (fr->hdrtype == AIM_FRAMETYPE_OFT) |
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351 | return sendframe_rendezvous(sess, fr); |
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352 | return -1; |
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353 | } |
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354 | |
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355 | faim_export int aim_tx_flushqueue(aim_session_t *sess) |
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356 | { |
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357 | aim_frame_t *cur; |
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358 | |
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359 | for (cur = sess->queue_outgoing; cur; cur = cur->next) { |
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360 | |
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361 | if (cur->handled) |
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362 | continue; /* already been sent */ |
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363 | |
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364 | if (cur->conn && (cur->conn->status & AIM_CONN_STATUS_INPROGRESS)) |
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365 | continue; |
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366 | |
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367 | /* |
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368 | * And now for the meager attempt to force transmit |
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369 | * latency and avoid missed messages. |
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370 | */ |
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371 | if ((cur->conn->lastactivity + cur->conn->forcedlatency) >= time(NULL)) { |
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372 | /* |
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373 | * XXX should be a break! we dont want to block the |
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374 | * upper layers |
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375 | * |
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376 | * XXX or better, just do this right. |
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377 | * |
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378 | */ |
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379 | sleep((cur->conn->lastactivity + cur->conn->forcedlatency) - time(NULL)); |
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380 | } |
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381 | |
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382 | /* XXX this should call the custom "queuing" function!! */ |
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383 | aim_tx_sendframe(sess, cur); |
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384 | } |
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385 | |
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386 | /* purge sent commands from queue */ |
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387 | aim_tx_purgequeue(sess); |
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388 | |
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389 | return 0; |
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390 | } |
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391 | |
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392 | /* |
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393 | * aim_tx_purgequeue() |
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394 | * |
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395 | * This is responsable for removing sent commands from the transmit |
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396 | * queue. This is not a required operation, but it of course helps |
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397 | * reduce memory footprint at run time! |
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398 | * |
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399 | */ |
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400 | faim_export void aim_tx_purgequeue(aim_session_t *sess) |
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401 | { |
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402 | aim_frame_t *cur, **prev; |
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403 | |
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404 | for (prev = &sess->queue_outgoing; (cur = *prev); ) { |
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405 | |
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406 | if (cur->handled) { |
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407 | *prev = cur->next; |
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408 | |
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409 | aim_frame_destroy(cur); |
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410 | |
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411 | } else |
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412 | prev = &cur->next; |
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413 | } |
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414 | |
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415 | return; |
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416 | } |
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417 | |
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418 | /** |
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419 | * aim_tx_cleanqueue - get rid of packets waiting for tx on a dying conn |
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420 | * @sess: session |
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421 | * @conn: connection that's dying |
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422 | * |
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423 | * for now this simply marks all packets as sent and lets them |
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424 | * disappear without warning. |
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425 | * |
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426 | */ |
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427 | faim_internal void aim_tx_cleanqueue(aim_session_t *sess, aim_conn_t *conn) |
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428 | { |
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429 | aim_frame_t *cur; |
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430 | |
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431 | for (cur = sess->queue_outgoing; cur; cur = cur->next) { |
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432 | if (cur->conn == conn) |
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433 | cur->handled = 1; |
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434 | } |
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435 | |
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436 | return; |
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437 | } |
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