4 * This file contains the management routines for the receive
5 * (incoming packet) queue. The actual packet handlers are in
12 #include <sys/socket.h>
16 * Since not all implementations support MSG_WAITALL, define
17 * an alternate guarenteed read function...
19 * We keep recv() for systems that can do it because it means
20 * a single system call for the entire packet, where read may
21 * take more for a badly fragmented packet.
24 faim_internal int aim_recv(int fd, void *buf, size_t count)
27 return recv(fd, buf, count, MSG_WAITALL);
29 int left, ret, cur = 0;
34 ret = recv(fd, ((unsigned char *)buf)+cur, left, 0);
49 * Grab a single command sequence off the socket, and enqueue
50 * it in the incoming event queue in a seperate struct.
52 faim_export int aim_get_command(struct aim_session_t *sess, struct aim_conn_t *conn)
54 unsigned char generic[6];
55 struct command_rx_struct *newrx = NULL;
60 if (conn->fd < 3) /* can happen when people abuse the interface */
64 * Rendezvous (client-client) connections do not speak
65 * FLAP, so this function will break on them.
67 if (conn->type == AIM_CONN_TYPE_RENDEZVOUS)
68 return aim_get_command_rendezvous(sess, conn);
69 if (conn->type == AIM_CONN_TYPE_RENDEZVOUS_OUT)
73 * Read FLAP header. Six bytes:
75 * 0 char -- Always 0x2a
76 * 1 char -- Channel ID. Usually 2 -- 1 and 4 are used during login.
77 * 2 short -- Sequence number
78 * 4 short -- Number of data bytes that follow.
80 faim_mutex_lock(&conn->active);
81 if (aim_recv(conn->fd, generic, 6) < 6){
83 faim_mutex_unlock(&conn->active);
88 * This shouldn't happen unless the socket breaks, the server breaks,
89 * or we break. We must handle it just in case.
91 if (generic[0] != 0x2a) {
92 faimdprintf(1, "Bad incoming data!");
94 faim_mutex_unlock(&conn->active);
98 /* allocate a new struct */
99 if (!(newrx = (struct command_rx_struct *)malloc(sizeof(struct command_rx_struct)))) {
100 faim_mutex_unlock(&conn->active);
103 memset(newrx, 0x00, sizeof(struct command_rx_struct));
105 newrx->lock = 1; /* lock the struct */
107 /* we're doing OSCAR if we're here */
108 newrx->hdrtype = AIM_FRAMETYPE_OSCAR;
110 /* store channel -- byte 2 */
111 newrx->hdr.oscar.type = (char) generic[1];
113 /* store seqnum -- bytes 3 and 4 */
114 newrx->hdr.oscar.seqnum = aimutil_get16(generic+2);
116 /* store commandlen -- bytes 5 and 6 */
117 newrx->commandlen = aimutil_get16(generic+4);
119 newrx->nofree = 0; /* free by default */
121 /* malloc for data portion */
122 if (!(newrx->data = (u_char *) malloc(newrx->commandlen))) {
124 faim_mutex_unlock(&conn->active);
128 /* read the data portion of the packet */
129 if (aim_recv(conn->fd, newrx->data, newrx->commandlen) < newrx->commandlen){
132 aim_conn_close(conn);
133 faim_mutex_unlock(&conn->active);
136 faim_mutex_unlock(&conn->active);
140 newrx->next = NULL; /* this will always be at the bottom */
141 newrx->lock = 0; /* unlock */
143 /* enqueue this packet */
144 if (sess->queue_incoming == NULL) {
145 sess->queue_incoming = newrx;
147 struct command_rx_struct *cur;
150 * This append operation takes a while. It might be faster
151 * if we maintain a pointer to the last entry in the queue
152 * and just update that. Need to determine if the overhead
153 * to maintain that is lower than the overhead for this loop.
155 for (cur = sess->queue_incoming; cur->next; cur = cur->next)
160 newrx->conn->lastactivity = time(NULL);
166 * Purge recieve queue of all handled commands (->handled==1). Also
167 * allows for selective freeing using ->nofree so that the client can
168 * keep the data for various purposes.
170 * If ->nofree is nonzero, the frame will be delinked from the global list,
171 * but will not be free'ed. The client _must_ keep a pointer to the
172 * data -- libfaim will not! If the client marks ->nofree but
173 * does not keep a pointer, it's lost forever.
176 faim_export void aim_purge_rxqueue(struct aim_session_t *sess)
178 struct command_rx_struct *cur = NULL;
179 struct command_rx_struct *tmp;
181 if (sess->queue_incoming == NULL)
184 if (sess->queue_incoming->next == NULL) {
185 if (sess->queue_incoming->handled) {
186 tmp = sess->queue_incoming;
187 sess->queue_incoming = NULL;
190 if (tmp->hdrtype == AIM_FRAMETYPE_OFT)
191 free(tmp->hdr.oft.hdr2);
200 for(cur = sess->queue_incoming; cur->next != NULL; ) {
201 if (cur->next->handled) {
203 cur->next = tmp->next;
205 if (tmp->hdrtype == AIM_FRAMETYPE_OFT)
206 free(tmp->hdr.oft.hdr2);
215 * Be careful here. Because of the way we just
216 * manipulated the pointer, cur may be NULL and
217 * the for() will segfault doing the check unless
218 * we find this case first.
228 * Since aim_get_command will aim_conn_kill dead connections, we need
229 * to clean up the rxqueue of unprocessed connections on that socket.
231 * XXX: this is something that was handled better in the old connection
232 * handling method, but eh.
234 faim_internal void aim_rxqueue_cleanbyconn(struct aim_session_t *sess, struct aim_conn_t *conn)
236 struct command_rx_struct *currx;
238 for (currx = sess->queue_incoming; currx; currx = currx->next) {
239 if ((!currx->handled) && (currx->conn == conn))