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1 | /* | |
2 | * aim_txqueue.c | |
3 | * | |
4 | * Herein lies all the mangement routines for the transmit (Tx) queue. | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <faim/aim.h> | |
9 | ||
10 | /* | |
11 | * Allocate a new tx frame. | |
12 | * | |
13 | * This is more for looks than anything else. | |
14 | * | |
15 | * Right now, that is. If/when we implement a pool of transmit | |
16 | * frames, this will become the request-an-unused-frame part. | |
17 | */ | |
18 | struct command_tx_struct *aim_tx_new(int chan, struct aim_conn_t *conn, int datalen) | |
19 | { | |
20 | struct command_tx_struct *new; | |
21 | ||
22 | if (!conn) | |
23 | return NULL; | |
24 | ||
25 | new = (struct command_tx_struct *)malloc(sizeof(struct command_tx_struct)); | |
26 | if (!new) | |
27 | return NULL; | |
28 | memset(new, 0, sizeof(struct command_tx_struct)); | |
29 | ||
30 | new->conn = conn; | |
31 | new->type = chan; | |
32 | ||
33 | if(datalen) { | |
34 | new->data = (u_char *)malloc(datalen); | |
35 | new->commandlen = datalen; | |
36 | } | |
37 | ||
38 | return new; | |
39 | } | |
40 | ||
41 | /* | |
42 | * aim_tx_enqeue() | |
43 | * | |
44 | * The overall purpose here is to enqueue the passed in command struct | |
45 | * into the outgoing (tx) queue. Basically... | |
46 | * 1) Make a scope-irrelevent copy of the struct | |
47 | * 2) Lock the struct | |
48 | * 3) Mark as not-sent-yet | |
49 | * 4) Enqueue the struct into the list | |
50 | * 5) Unlock the struct once it's linked in | |
51 | * 6) Return | |
52 | * | |
53 | */ | |
54 | int aim_tx_enqueue(struct aim_session_t *sess, | |
55 | struct command_tx_struct *newpacket) | |
56 | { | |
57 | struct command_tx_struct *cur; | |
58 | ||
59 | if (newpacket->conn == NULL) { | |
60 | faimdprintf(1, "aim_tx_enqueue: WARNING: enqueueing packet with no connecetion\n"); | |
61 | newpacket->conn = aim_getconn_type(sess, AIM_CONN_TYPE_BOS); | |
62 | } | |
63 | ||
64 | /* assign seqnum */ | |
65 | newpacket->seqnum = aim_get_next_txseqnum(newpacket->conn); | |
66 | /* set some more fields */ | |
67 | newpacket->lock = 1; /* lock */ | |
68 | newpacket->sent = 0; /* not sent yet */ | |
69 | newpacket->next = NULL; /* always last */ | |
70 | ||
71 | /* see overhead note in aim_rxqueue counterpart */ | |
72 | if (sess->queue_outgoing == NULL) { | |
73 | sess->queue_outgoing = newpacket; | |
74 | } else { | |
75 | for (cur = sess->queue_outgoing; | |
76 | cur->next; | |
77 | cur = cur->next) | |
78 | ; | |
79 | cur->next = newpacket; | |
80 | } | |
81 | ||
82 | newpacket->lock = 0; /* unlock so it can be sent */ | |
83 | ||
84 | #if debug == 2 | |
85 | faimdprintf(2, "calling aim_tx_printqueue()\n"); | |
86 | aim_tx_printqueue(sess); | |
87 | faimdprintf(2, "back from aim_tx_printqueue()\n"); | |
88 | #endif | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | /* | |
94 | * aim_get_next_txseqnum() | |
95 | * | |
96 | * This increments the tx command count, and returns the seqnum | |
97 | * that should be stamped on the next FLAP packet sent. This is | |
98 | * normally called during the final step of packet preparation | |
99 | * before enqueuement (in aim_tx_enqueue()). | |
100 | * | |
101 | */ | |
102 | u_int aim_get_next_txseqnum(struct aim_conn_t *conn) | |
103 | { | |
104 | return ( ++conn->seqnum ); | |
105 | } | |
106 | ||
107 | /* | |
108 | * aim_tx_printqueue() | |
109 | * | |
110 | * This is basically for debuging purposes only. It dumps all the | |
111 | * records in the tx queue and their current status. Very helpful | |
112 | * if the queue isn't working quite right. | |
113 | * | |
114 | */ | |
115 | #if debug == 2 | |
116 | int aim_tx_printqueue(struct aim_session_t *sess) | |
117 | { | |
118 | struct command_tx_struct *cur; | |
119 | ||
120 | faimdprintf(2, "\ncurrent aim_queue_outgoing...\n"); | |
121 | faimdprintf(2, "\ttype seqnum len lock sent\n"); | |
122 | ||
123 | if (sess->queue_outgoing == NULL) | |
124 | faimdprintf(2, "aim_tx_flushqueue(): queue empty"); | |
125 | else { | |
126 | for (cur = sess->queue_outgoing; cur; cur = cur->next) { | |
127 | faimdprintf(2, "\t %2x %4x %4x %1d %1d\n", | |
128 | cur->type, cur->seqnum, | |
129 | cur->commandlen, cur->lock, | |
130 | cur->sent); | |
131 | } | |
132 | } | |
133 | ||
134 | faimdprintf(2, "\n(done printing queue)\n"); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | #endif | |
139 | ||
140 | /* | |
141 | * aim_tx_flushqueue() | |
142 | * | |
143 | * This the function is responsable for putting the queued commands | |
144 | * onto the wire. This function is critical to the operation of | |
145 | * the queue and therefore is the most prone to brokenness. It | |
146 | * seems to be working quite well at this point. | |
147 | * | |
148 | * Procedure: | |
149 | * 1) Traverse the list, only operate on commands that are unlocked | |
150 | * and haven't been sent yet. | |
151 | * 2) Lock the struct | |
152 | * 3) Allocate a temporary buffer to store the finished, fully | |
153 | * processed packet in. | |
154 | * 4) Build the packet from the command_tx_struct data. | |
155 | * 5) Write the packet to the socket. | |
156 | * 6) If success, mark the packet sent, if fail report failure, do NOT | |
157 | * mark the packet sent (so it will not get purged and therefore | |
158 | * be attempted again on next call). | |
159 | * 7) Unlock the struct. | |
160 | * 8) Free the temp buffer | |
161 | * 9) Step to next struct in list and go back to 1. | |
162 | * | |
163 | */ | |
164 | int aim_tx_flushqueue(struct aim_session_t *sess) | |
165 | { | |
166 | struct command_tx_struct *cur; | |
167 | u_char *curPacket = NULL; | |
168 | #if debug > 1 | |
169 | int i = 0; | |
170 | #endif | |
171 | ||
172 | if (sess->queue_outgoing == NULL) | |
173 | return 0; | |
174 | ||
175 | faimdprintf(2, "beginning txflush...\n"); | |
176 | for (cur = sess->queue_outgoing; cur; cur = cur->next) { | |
177 | /* only process if its unlocked and unsent */ | |
178 | if (!cur->lock && !cur->sent) { | |
179 | ||
180 | /* | |
181 | * And now for the meager attempt to force transmit | |
182 | * latency and avoid missed messages. | |
183 | */ | |
184 | if ((cur->conn->lastactivity + cur->conn->forcedlatency) >= time(NULL)) { | |
185 | /* FIXME FIXME -- should be a break! we dont want to block the upper layers */ | |
186 | sleep((cur->conn->lastactivity + cur->conn->forcedlatency) - time(NULL)); | |
187 | } | |
188 | ||
189 | cur->lock = 1; /* lock the struct */ | |
190 | ||
191 | /* allocate full-packet buffer */ | |
192 | curPacket = (char *) malloc(cur->commandlen + 6); | |
193 | ||
194 | /* command byte */ | |
195 | curPacket[0] = 0x2a; | |
196 | ||
197 | /* type/family byte */ | |
198 | curPacket[1] = cur->type; | |
199 | ||
200 | /* bytes 3+4: word: FLAP sequence number */ | |
201 | aimutil_put16(curPacket+2, cur->seqnum); | |
202 | ||
203 | /* bytes 5+6: word: SNAC len */ | |
204 | aimutil_put16(curPacket+4, cur->commandlen); | |
205 | ||
206 | /* bytes 7 and on: raw: SNAC data */ | |
207 | memcpy(&(curPacket[6]), cur->data, cur->commandlen); | |
208 | ||
209 | /* full image of raw packet data now in curPacket */ | |
210 | if ( (u_int)write(cur->conn->fd, curPacket, (cur->commandlen + 6)) != (cur->commandlen + 6)) { | |
211 | printf("\nWARNING: Error in sending packet 0x%4x -- will try again next time\n\n", cur->seqnum); | |
212 | cur->sent = 0; /* mark it unsent */ | |
213 | continue; /* bail out */ | |
214 | } else { | |
215 | faimdprintf(2, "\nSENT 0x%4x\n\n", cur->seqnum); | |
216 | ||
217 | cur->sent = 1; /* mark the struct as sent */ | |
218 | cur->conn->lastactivity = time(NULL); | |
219 | } | |
220 | #if debug > 2 | |
221 | faimdprintf(2, "\nPacket:"); | |
222 | for (i = 0; i < (cur->commandlen + 6); i++) { | |
223 | if ((i % 8) == 0) { | |
224 | faimdprintf(2, "\n\t"); | |
225 | } | |
226 | if (curPacket[i] >= ' ' && curPacket[i]<127) { | |
227 | faimdprintf(2, "%c=%02x ", curPacket[i], curPacket[i]); | |
228 | } else { | |
229 | faimdprintf(2, "0x%2x ", curPacket[i]); | |
230 | } | |
231 | } | |
232 | faimdprintf(2, "\n"); | |
233 | #endif | |
234 | cur->lock = 0; /* unlock the struct */ | |
235 | free(curPacket); /* free up full-packet buffer */ | |
236 | } | |
237 | } | |
238 | ||
239 | /* purge sent commands from queue */ | |
240 | aim_tx_purgequeue(sess); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | /* | |
246 | * aim_tx_purgequeue() | |
247 | * | |
248 | * This is responsable for removing sent commands from the transmit | |
249 | * queue. This is not a required operation, but it of course helps | |
250 | * reduce memory footprint at run time! | |
251 | * | |
252 | */ | |
253 | void aim_tx_purgequeue(struct aim_session_t *sess) | |
254 | { | |
255 | struct command_tx_struct *cur = NULL; | |
256 | struct command_tx_struct *tmp; | |
257 | ||
258 | if (sess->queue_outgoing == NULL) | |
259 | return; | |
260 | ||
261 | if (sess->queue_outgoing->next == NULL) { | |
262 | if (!sess->queue_outgoing->lock && sess->queue_outgoing->sent) { | |
263 | tmp = sess->queue_outgoing; | |
264 | sess->queue_outgoing = NULL; | |
265 | free(tmp->data); | |
266 | free(tmp); | |
267 | } | |
268 | return; | |
269 | } | |
270 | ||
271 | for(cur = sess->queue_outgoing; cur->next != NULL; ) { | |
272 | if (!cur->next->lock && cur->next->sent) { | |
273 | tmp = cur->next; | |
274 | cur->next = tmp->next; | |
275 | free(tmp->data); | |
276 | free(tmp); | |
277 | } | |
278 | cur = cur->next; | |
279 | ||
280 | /* | |
281 | * Be careful here. Because of the way we just | |
282 | * manipulated the pointer, cur may be NULL and | |
283 | * the for() will segfault doing the check unless | |
284 | * we find this case first. | |
285 | */ | |
286 | if (cur == NULL) | |
287 | break; | |
288 | } | |
289 | return; | |
290 | } |