int eventhandler(rudp_socket_t rsocket, rudp_event_t event, struct sockaddr_in *remote) {
struct rxfile *rx;
switch (event) {
case RUDP_EVENT_TIMEOUT:
if (remote) {
fprintf(stderr, "vs_recv: time out in communication with %s:%d\n",
inet_ntoa(remote->sin_addr),
ntohs(remote->sin_port));
if ((rx = rxfind(remote))) {
if (rx->fileopen) {
close(rx->fd);
}
rxdel(rx);
}
}
else {
fprintf(stderr, "vs_recv: time out\n");
}
break;
case RUDP_EVENT_CLOSED:
if (remote && (rx = rxfind(remote))) {
if (rx->fileopen) {
fprintf(stderr, "vs_recv: prematurely closed communication with %s:%d\n",
inet_ntoa(remote->sin_addr),
ntohs(remote->sin_port));
close(rx->fd);
}
rxdel(rx);
}else {
fprintf(stderr, "vs_recv: closing socket\n");
}
break;
default:
fprintf(stderr, "vs_recv: unknown event %d\n", event);
break;
}
return 0;
}
int rudp_receiver(rudp_socket_t rsocket, struct sockaddr_in *remote, char *buf, int len) {
struct rxfile *rx;
int namelen;
int i;
struct vsftp *vs = (struct vsftp *) buf;
if (len < VS_MINLEN) {
fprintf(stderr, "vs_recv: Too short VSFTP packet (%d bytes)\n",
len);
return 0;
}
rx = rxfind(remote);
switch (ntohl(vs->vs_type)) {
case VS_TYPE_BEGIN:
namelen = len - sizeof (vs->vs_type);
if (namelen > VS_FILENAMELENGTH)
namelen = VS_FILENAMELENGTH;
strncpy(rx->name, vs->vs_info.vs_filename, namelen);
rx->name[namelen] = '\0'; /* Null terminated */
/* Verify that file name is valid
* Only alpha-numerical, period, dash and
* underscore are allowed */
for (i = 0; i < namelen; i++) {
char c = rx->name[i];
if (!(isalnum(c) || c == '.' || c == '_' || c == '-')) {
fprintf(stderr, "vs_recv: Illegal file name \"%s\"\n",
rx->name);
rudp_close(rsocket);
return 0;
}
}
if (debug) {
fprintf(stderr, "vs_recv: BEGIN \"%s\" (%d bytes) from %s:%d\n", rx->name, len,
inet_ntoa(remote->sin_addr), ntohs(remote->sin_port));
}
if ((rx->fd = creat(rx->name, 0644)) < 0) {
perror("vs_recv: create");
rudp_close(rsocket);
} else {
rx->fileopen = 1;
}
break;
case VS_TYPE_DATA:
if (debug) {
fprintf(stderr, "vs_recv: DATA (%d bytes) from %s:%d\n",
len,
inet_ntoa(remote->sin_addr), ntohs(remote->sin_port));
}
len -= sizeof (vs->vs_type);
/* len now is length of payload (data or file name) */
if (rx->fileopen) {
if ((write(rx->fd, vs->vs_info.vs_filename, len)) < 0) {
perror("vs_recv: write");
}
} else {
fprintf(stderr, "vs_recv: DATA ignored (file not open)\n");
}
break;
case VS_TYPE_END:
if (debug) {
fprintf(stderr, "vs_recv: END (%d bytes) from %s:%d\n",
len, inet_ntoa(remote->sin_addr), ntohs(remote->sin_port));
}
printf("vs_recv: received end of file \"%s\"\n", rx->name);
if (rx->fileopen) {
close(rx->fd);
rxdel(rx);
}
/* else ignore */
break;
default:
fprintf(stderr, "vs_recv: bad vsftp type %d from %s:%d\n",
vs->vs_type, inet_ntoa(remote->sin_addr), ntohs(remote->sin_port));
}
return 0;
}