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Commit | Line | Data |
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1 | /* | |
2 | * aim_rxqueue.c | |
3 | * | |
4 | * This file contains the management routines for the receive | |
5 | * (incoming packet) queue. The actual packet handlers are in | |
6 | * aim_rxhandlers.c. | |
7 | */ | |
8 | ||
9 | #include <faim/aim.h> | |
10 | ||
11 | /* | |
12 | * Grab a single command sequence off the socket, and enqueue | |
13 | * it in the incoming event queue in a seperate struct. | |
14 | */ | |
15 | int aim_get_command(struct aim_session_t *sess, struct aim_conn_t *conn) | |
16 | { | |
17 | unsigned char generic[6]; | |
18 | struct command_rx_struct *newrx = NULL; | |
19 | ||
20 | if (!sess || !conn) | |
21 | return 0; | |
22 | ||
23 | if (conn->fd < 3) /* can happen when people abuse the interface */ | |
24 | return 0; | |
25 | ||
26 | /* | |
27 | * Rendezvous (client-client) connections do not speak | |
28 | * FLAP, so this function will break on them. | |
29 | */ | |
30 | if (conn->type == AIM_CONN_TYPE_RENDEZVOUS) | |
31 | return aim_get_command_rendezvous(sess, conn); | |
32 | if (conn->type == AIM_CONN_TYPE_RENDEZVOUS_OUT) | |
33 | return 0; | |
34 | ||
35 | /* | |
36 | * Read FLAP header. Six bytes: | |
37 | * | |
38 | * 0 char -- Always 0x2a | |
39 | * 1 char -- Channel ID. Usually 2 -- 1 and 4 are used during login. | |
40 | * 2 short -- Sequence number | |
41 | * 4 short -- Number of data bytes that follow. | |
42 | */ | |
43 | faim_mutex_lock(&conn->active); | |
44 | if (read(conn->fd, generic, 6) < 6){ | |
45 | aim_conn_kill(sess, &conn); | |
46 | faim_mutex_unlock(&conn->active); | |
47 | return -1; | |
48 | } | |
49 | ||
50 | /* | |
51 | * This shouldn't happen unless the socket breaks, the server breaks, | |
52 | * or we break. We must handle it just in case. | |
53 | */ | |
54 | if (generic[0] != 0x2a) { | |
55 | faimdprintf(1, "Bad incoming data!"); | |
56 | faim_mutex_unlock(&conn->active); | |
57 | return -1; | |
58 | } | |
59 | ||
60 | /* allocate a new struct */ | |
61 | if (!(newrx = (struct command_rx_struct *)malloc(sizeof(struct command_rx_struct)))) { | |
62 | faim_mutex_unlock(&conn->active); | |
63 | return -1; | |
64 | } | |
65 | memset(newrx, 0x00, sizeof(struct command_rx_struct)); | |
66 | ||
67 | newrx->lock = 1; /* lock the struct */ | |
68 | ||
69 | /* we're doing OSCAR if we're here */ | |
70 | newrx->hdrtype = AIM_FRAMETYPE_OSCAR; | |
71 | ||
72 | /* store channel -- byte 2 */ | |
73 | newrx->hdr.oscar.type = (char) generic[1]; | |
74 | ||
75 | /* store seqnum -- bytes 3 and 4 */ | |
76 | newrx->hdr.oscar.seqnum = aimutil_get16(generic+2); | |
77 | ||
78 | /* store commandlen -- bytes 5 and 6 */ | |
79 | newrx->commandlen = aimutil_get16(generic+4); | |
80 | ||
81 | newrx->nofree = 0; /* free by default */ | |
82 | ||
83 | /* malloc for data portion */ | |
84 | if (!(newrx->data = (u_char *) malloc(newrx->commandlen))) { | |
85 | free(newrx); | |
86 | faim_mutex_unlock(&conn->active); | |
87 | return -1; | |
88 | } | |
89 | ||
90 | /* read the data portion of the packet */ | |
91 | if (read(conn->fd, newrx->data, newrx->commandlen) < newrx->commandlen){ | |
92 | free(newrx->data); | |
93 | free(newrx); | |
94 | aim_conn_kill(sess, &conn); | |
95 | faim_mutex_unlock(&conn->active); | |
96 | return -1; | |
97 | } | |
98 | faim_mutex_unlock(&conn->active); | |
99 | ||
100 | newrx->conn = conn; | |
101 | ||
102 | newrx->next = NULL; /* this will always be at the bottom */ | |
103 | newrx->lock = 0; /* unlock */ | |
104 | ||
105 | /* enqueue this packet */ | |
106 | if (sess->queue_incoming == NULL) { | |
107 | sess->queue_incoming = newrx; | |
108 | } else { | |
109 | struct command_rx_struct *cur; | |
110 | ||
111 | /* | |
112 | * This append operation takes a while. It might be faster | |
113 | * if we maintain a pointer to the last entry in the queue | |
114 | * and just update that. Need to determine if the overhead | |
115 | * to maintain that is lower than the overhead for this loop. | |
116 | */ | |
117 | for (cur = sess->queue_incoming; cur->next; cur = cur->next) | |
118 | ; | |
119 | cur->next = newrx; | |
120 | } | |
121 | ||
122 | newrx->conn->lastactivity = time(NULL); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Purge recieve queue of all handled commands (->handled==1). Also | |
129 | * allows for selective freeing using ->nofree so that the client can | |
130 | * keep the data for various purposes. | |
131 | * | |
132 | * If ->nofree is nonzero, the frame will be delinked from the global list, | |
133 | * but will not be free'ed. The client _must_ keep a pointer to the | |
134 | * data -- libfaim will not! If the client marks ->nofree but | |
135 | * does not keep a pointer, it's lost forever. | |
136 | * | |
137 | */ | |
138 | void aim_purge_rxqueue(struct aim_session_t *sess) | |
139 | { | |
140 | struct command_rx_struct *cur = NULL; | |
141 | struct command_rx_struct *tmp; | |
142 | ||
143 | if (sess->queue_incoming == NULL) | |
144 | return; | |
145 | ||
146 | if (sess->queue_incoming->next == NULL) { | |
147 | if (sess->queue_incoming->handled) { | |
148 | tmp = sess->queue_incoming; | |
149 | sess->queue_incoming = NULL; | |
150 | ||
151 | if (!tmp->nofree) { | |
152 | if (tmp->hdrtype == AIM_FRAMETYPE_OFT) | |
153 | free(tmp->hdr.oft.hdr2); | |
154 | free(tmp->data); | |
155 | free(tmp); | |
156 | } else | |
157 | tmp->next = NULL; | |
158 | } | |
159 | return; | |
160 | } | |
161 | ||
162 | for(cur = sess->queue_incoming; cur->next != NULL; ) { | |
163 | if (cur->next->handled) { | |
164 | tmp = cur->next; | |
165 | cur->next = tmp->next; | |
166 | if (!tmp->nofree) { | |
167 | if (tmp->hdrtype == AIM_FRAMETYPE_OFT) | |
168 | free(tmp->hdr.oft.hdr2); | |
169 | free(tmp->data); | |
170 | free(tmp); | |
171 | } else | |
172 | tmp->next = NULL; | |
173 | } | |
174 | cur = cur->next; | |
175 | ||
176 | /* | |
177 | * Be careful here. Because of the way we just | |
178 | * manipulated the pointer, cur may be NULL and | |
179 | * the for() will segfault doing the check unless | |
180 | * we find this case first. | |
181 | */ | |
182 | if (cur == NULL) | |
183 | break; | |
184 | } | |
185 | ||
186 | return; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Since aim_get_command will aim_conn_kill dead connections, we need | |
191 | * to clean up the rxqueue of unprocessed connections on that socket. | |
192 | * | |
193 | * XXX: this is something that was handled better in the old connection | |
194 | * handling method, but eh. | |
195 | */ | |
196 | void aim_rxqueue_cleanbyconn(struct aim_session_t *sess, struct aim_conn_t *conn) | |
197 | { | |
198 | struct command_rx_struct *currx; | |
199 | ||
200 | for (currx = sess->queue_incoming; currx; currx = currx->next) { | |
201 | if ((!currx->handled) && (currx->conn == conn)) | |
202 | currx->handled = 1; | |
203 | } | |
204 | return; | |
205 | } |