2 * Copyright (c) 2010 Mark Williams
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4 * File change event API for netatalk
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6 * for every detected filesystem change a UDP packet is sent to an arbitrary list
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7 * of listeners. Each packet contains unix path of modified filesystem element,
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8 * event reason, and a consecutive event id (32 bit). Technically we are UDP client and are sending
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9 * out packets synchronuosly as they are created by the afp functions. This should not affect
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10 * performance measurably. The only delaying calls occur during initialization, if we have to
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11 * resolve non-IP hostnames to IP. All numeric data inside the packet is network byte order, so use
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12 * ntohs / ntohl to resolve length and event id. Ideally a listener receives every packet with
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13 * no gaps in event ids, starting with event id 1 and mode FCE_CONN_START followed by
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14 * data events from id 2 up to 0xFFFFFFFF, followed by 0 to 0xFFFFFFFF and so on.
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16 * A gap or not starting with 1 mode FCE_CONN_START or receiving mode FCE_CONN_BROKEN means that
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17 * the listener has lost at least one filesystem event
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19 * All Rights Reserved. See COPYRIGHT.
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22 #ifdef HAVE_CONFIG_H
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24 #endif /* HAVE_CONFIG_H */
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34 #include <sys/param.h>
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35 #include <sys/socket.h>
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36 #include <netinet/in.h>
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37 #include <arpa/inet.h>
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40 #include <netatalk/at.h>
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42 #include <atalk/adouble.h>
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43 #include <atalk/vfs.h>
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44 #include <atalk/logger.h>
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45 #include <atalk/afp.h>
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46 #include <atalk/util.h>
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47 #include <atalk/cnid.h>
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48 #include <atalk/unix.h>
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49 #include <atalk/fce_api.h>
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50 #include <atalk/globals.h>
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54 #include "directory.h"
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55 #include "desktop.h"
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58 // ONLY USED IN THIS FILE
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59 #include "fce_api_internal.h"
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64 /* We store our connection data here */
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65 static struct udp_entry udp_socket_list[FCE_MAX_UDP_SOCKS];
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66 static int udp_sockets = 0;
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67 static int udp_initialized = FCE_FALSE;
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68 static unsigned long fce_ev_enabled =
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69 (1 << FCE_FILE_MODIFY) |
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70 (1 << FCE_FILE_DELETE) |
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71 (1 << FCE_DIR_DELETE) |
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72 (1 << FCE_FILE_CREATE) |
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73 (1 << FCE_DIR_CREATE);
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75 static uint64_t tm_used; /* used for passing to event handler */
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76 #define MAXIOBUF 1024
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77 static char iobuf[MAXIOBUF];
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78 static const char *skip_files[] =
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86 * Initialize network structs for any listeners
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87 * We dont give return code because all errors are handled internally (I hope..)
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93 struct addrinfo hints, *servinfo, *p;
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95 if (udp_initialized == FCE_TRUE)
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98 memset(&hints, 0, sizeof hints);
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99 hints.ai_family = AF_UNSPEC;
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100 hints.ai_socktype = SOCK_DGRAM;
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102 for (int i = 0; i < udp_sockets; i++) {
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103 struct udp_entry *udp_entry = udp_socket_list + i;
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105 /* Close any pending sockets */
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106 if (udp_entry->sock != -1)
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107 close(udp_entry->sock);
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109 if ((rv = getaddrinfo(udp_entry->addr, udp_entry->port, &hints, &servinfo)) != 0) {
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110 LOG(log_error, logtype_afpd, "fce_init_udp: getaddrinfo(%s:%s): %s",
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111 udp_entry->addr, udp_entry->port, gai_strerror(rv));
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115 /* loop through all the results and make a socket */
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116 for (p = servinfo; p != NULL; p = p->ai_next) {
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117 if ((udp_entry->sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
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118 LOG(log_error, logtype_afpd, "fce_init_udp: socket(%s:%s): %s",
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119 udp_entry->addr, udp_entry->port, strerror(errno));
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126 LOG(log_error, logtype_afpd, "fce_init_udp: no socket for %s:%s",
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127 udp_entry->addr, udp_entry->port);
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129 udp_entry->addrinfo = *p;
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130 memcpy(&udp_entry->addrinfo, p, sizeof(struct addrinfo));
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131 memcpy(&udp_entry->sockaddr, p->ai_addr, sizeof(struct sockaddr_storage));
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132 freeaddrinfo(servinfo);
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135 udp_initialized = FCE_TRUE;
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140 if (udp_initialized == FCE_FALSE )
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143 for (int i = 0; i < udp_sockets; i++)
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145 struct udp_entry *udp_entry = udp_socket_list + i;
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147 /* Close any pending sockets */
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148 if (udp_entry->sock != -1)
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150 close( udp_entry->sock );
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151 udp_entry->sock = -1;
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154 udp_initialized = FCE_FALSE;
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159 * Construct a UDP packet for our listeners and return packet size
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161 static ssize_t build_fce_packet( struct fce_packet *packet, char *path, int mode, uint32_t event_id )
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164 ssize_t data_len = 0;
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166 strncpy(packet->magic, FCE_PACKET_MAGIC, sizeof(packet->magic) );
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167 packet->version = FCE_PACKET_VERSION;
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168 packet->mode = mode;
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169 packet->event_id = event_id;
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171 pathlen = strlen(path) + 1; /* include string terminator */
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173 /* This should never happen, but before we bust this server, we send nonsense, fce listener has to cope */
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174 if (pathlen >= MAXPATHLEN)
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175 pathlen = MAXPATHLEN - 1;
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177 /* This is the payload len. Means: the stream has len bytes more until packet is finished */
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178 /* A server should read the first 16 byte, decode them and then fetch the rest */
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179 data_len = FCE_PACKET_HEADER_SIZE + pathlen;
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180 packet->datalen = pathlen;
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184 tm_used = hton64(tm_used);
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185 memcpy(packet->data, &tm_used, sizeof(tm_used));
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186 strncpy(packet->data + sizeof(tm_used), path, pathlen);
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188 packet->datalen += sizeof(tm_used);
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189 data_len += sizeof(tm_used);
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192 strncpy(packet->data, path, pathlen);
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196 /* return the packet len */
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200 static int pack_fce_packet(struct fce_packet *packet, unsigned char *buf)
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202 unsigned char *p = buf;
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204 memcpy(p, &packet->magic[0], sizeof(packet->magic));
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205 p += sizeof(packet->magic);
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207 *p = packet->version;
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213 uint32_t id = htonl(packet->event_id);
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214 memcpy(p, &id, sizeof(id));
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215 p += sizeof(packet->event_id);
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217 uint16_t l = htons(packet->datalen);
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218 memcpy(p, &l, sizeof(l));
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221 memcpy(p, &packet->data[0], packet->datalen);
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222 p += packet->datalen;
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228 * Send the fce information to all (connected) listeners
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229 * We dont give return code because all errors are handled internally (I hope..)
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231 static void send_fce_event( char *path, int mode )
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233 struct fce_packet packet;
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234 void *data = &packet;
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235 static uint32_t event_id = 0; /* the unique packet couter to detect packet/data loss. Going from 0xFFFFFFFF to 0x0 is a valid increment */
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237 LOG(log_debug, logtype_afpd, "send_fce_event: start");
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239 time_t now = time(NULL);
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241 /* build our data packet */
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242 ssize_t data_len = build_fce_packet( &packet, path, mode, ++event_id );
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243 pack_fce_packet(&packet, iobuf);
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245 for (int i = 0; i < udp_sockets; i++)
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248 struct udp_entry *udp_entry = udp_socket_list + i;
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250 /* we had a problem earlier ? */
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251 if (udp_entry->sock == -1)
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253 /* We still have to wait ?*/
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254 if (now < udp_entry->next_try_on_error)
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257 /* Reopen socket */
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258 udp_entry->sock = socket(udp_entry->addrinfo.ai_family,
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259 udp_entry->addrinfo.ai_socktype,
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260 udp_entry->addrinfo.ai_protocol);
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262 if (udp_entry->sock == -1) {
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263 /* failed again, so go to rest again */
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264 LOG(log_error, logtype_afpd, "Cannot recreate socket for fce UDP connection: errno %d", errno );
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266 udp_entry->next_try_on_error = now + FCE_SOCKET_RETRY_DELAY_S;
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270 udp_entry->next_try_on_error = 0;
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272 /* Okay, we have a running socket again, send server that we had a problem on our side*/
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273 data_len = build_fce_packet( &packet, "", FCE_CONN_BROKEN, 0 );
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274 pack_fce_packet(&packet, iobuf);
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276 sendto(udp_entry->sock,
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280 (struct sockaddr *)&udp_entry->sockaddr,
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281 udp_entry->addrinfo.ai_addrlen);
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283 /* Rebuild our original data packet */
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284 data_len = build_fce_packet( &packet, path, mode, event_id );
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285 pack_fce_packet(&packet, iobuf);
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288 sent_data = sendto(udp_entry->sock,
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292 (struct sockaddr *)&udp_entry->sockaddr,
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293 udp_entry->addrinfo.ai_addrlen);
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296 if (sent_data != data_len) {
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297 /* Argh, socket broke, we close and retry later */
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298 LOG(log_error, logtype_afpd, "send_fce_event: error sending packet to %s:%s, transfered %d of %d: %s",
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299 udp_entry->addr, udp_entry->port, sent_data, data_len, strerror(errno));
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301 close( udp_entry->sock );
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302 udp_entry->sock = -1;
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303 udp_entry->next_try_on_error = now + FCE_SOCKET_RETRY_DELAY_S;
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308 static int add_udp_socket(const char *target_ip, const char *target_port )
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310 if (target_port == NULL)
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311 target_port = FCE_DEFAULT_PORT_STRING;
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313 if (udp_sockets >= FCE_MAX_UDP_SOCKS) {
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314 LOG(log_error, logtype_afpd, "Too many file change api UDP connections (max %d allowed)", FCE_MAX_UDP_SOCKS );
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315 return AFPERR_PARAM;
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318 udp_socket_list[udp_sockets].addr = strdup(target_ip);
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319 udp_socket_list[udp_sockets].port = strdup(target_port);
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320 udp_socket_list[udp_sockets].sock = -1;
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321 memset(&udp_socket_list[udp_sockets].addrinfo, 0, sizeof(struct addrinfo));
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322 memset(&udp_socket_list[udp_sockets].sockaddr, 0, sizeof(struct sockaddr_storage));
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323 udp_socket_list[udp_sockets].next_try_on_error = 0;
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332 * Dispatcher for all incoming file change events
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335 static int register_fce(const char *u_name, int is_dir, int mode)
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337 if (udp_sockets == 0)
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338 /* No listeners configured */
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341 if (u_name == NULL)
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342 return AFPERR_PARAM;
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344 static int first_event = FCE_TRUE;
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346 /* do some initialization on the fly the first time */
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348 fce_initialize_history();
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351 /* handle files which should not cause events (.DS_Store atc. ) */
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352 for (int i = 0; skip_files[i] != NULL; i++)
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354 if (!strcmp( u_name, skip_files[i]))
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359 char full_path_buffer[MAXPATHLEN + 1] = {""};
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360 const char *cwd = getcwdpath();
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362 if (mode == FCE_TM_SIZE) {
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363 strlcpy(full_path_buffer, u_name, MAXPATHLEN);
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364 } else if (!is_dir || mode == FCE_DIR_DELETE) {
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365 if (strlen( cwd ) + strlen( u_name) + 1 >= MAXPATHLEN) {
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366 LOG(log_error, logtype_afpd, "FCE file name too long: %s/%s", cwd, u_name );
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367 return AFPERR_PARAM;
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369 sprintf( full_path_buffer, "%s/%s", cwd, u_name );
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371 if (strlen( cwd ) >= MAXPATHLEN) {
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372 LOG(log_error, logtype_afpd, "FCE directory name too long: %s", cwd);
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373 return AFPERR_PARAM;
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375 strcpy( full_path_buffer, cwd);
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378 /* Can we ignore this event based on type or history? */
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379 if (!(mode & FCE_TM_SIZE) && fce_handle_coalescation( full_path_buffer, is_dir, mode ))
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381 LOG(log_debug9, logtype_afpd, "Coalesced fc event <%d> for <%s>", mode, full_path_buffer );
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385 LOG(log_debug9, logtype_afpd, "Detected fc event <%d> for <%s>", mode, full_path_buffer );
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388 /* we do initilization on the fly, no blocking calls in here
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389 * (except when using FQDN in broken DNS environment)
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391 if (first_event == FCE_TRUE)
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395 /* Notify listeners the we start from the beginning */
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396 send_fce_event( "", FCE_CONN_START );
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398 first_event = FCE_FALSE;
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401 /* Handle UDP transport */
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402 send_fce_event( full_path_buffer, mode );
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408 /******************** External calls start here **************************/
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411 * API-Calls for file change api, called form outside (file.c directory.c ofork.c filedir.c)
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413 #ifndef FCE_TEST_MAIN
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415 int fce_register_delete_file( struct path *path )
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420 return AFPERR_PARAM;
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422 if (!(fce_ev_enabled & (1 << FCE_FILE_DELETE)))
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425 ret = register_fce( path->u_name, FALSE, FCE_FILE_DELETE );
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429 int fce_register_delete_dir( char *name )
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434 return AFPERR_PARAM;
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436 if (!(fce_ev_enabled & (1 << FCE_DIR_DELETE)))
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439 ret = register_fce( name, TRUE, FCE_DIR_DELETE);
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444 int fce_register_new_dir( struct path *path )
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449 return AFPERR_PARAM;
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451 if (!(fce_ev_enabled & (1 << FCE_DIR_CREATE)))
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454 ret = register_fce( path->u_name, TRUE, FCE_DIR_CREATE );
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460 int fce_register_new_file( struct path *path )
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465 return AFPERR_PARAM;
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467 if (!(fce_ev_enabled & (1 << FCE_FILE_CREATE)))
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470 ret = register_fce( path->u_name, FALSE, FCE_FILE_CREATE );
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475 int fce_register_file_modification( struct ofork *ofork )
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477 char *u_name = NULL;
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481 if (ofork == NULL || ofork->of_vol == NULL)
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482 return AFPERR_PARAM;
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484 if (!(fce_ev_enabled & (1 << FCE_FILE_MODIFY)))
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487 vol = ofork->of_vol;
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489 if (NULL == (u_name = mtoupath(vol, of_name(ofork), ofork->of_did, utf8_encoding())))
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491 return AFPERR_MISC;
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494 ret = register_fce( u_name, FALSE, FCE_FILE_MODIFY );
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499 int fce_register_tm_size(const char *vol, size_t used)
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504 return AFPERR_PARAM;
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506 if (!(fce_ev_enabled & (1 << FCE_TM_SIZE)))
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509 tm_used = used; /* oh what a hack */
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510 ret = register_fce(vol, FALSE, FCE_TM_SIZE);
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518 * Extern connect to afpd parameter, can be called multiple times for multiple listeners (up to MAX_UDP_SOCKS times)
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521 int fce_add_udp_socket(const char *target)
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523 const char *port = FCE_DEFAULT_PORT_STRING;
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524 char target_ip[256] = {""};
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526 strncpy(target_ip, target, sizeof(target_ip) -1);
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528 char *port_delim = strchr( target_ip, ':' );
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531 port = port_delim + 1;
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533 return add_udp_socket(target_ip, port);
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536 int fce_set_events(const char *events)
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541 if (events == NULL)
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542 return AFPERR_PARAM;
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544 e = strdup(events);
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546 fce_ev_enabled = 0;
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548 for (p = strtok(e, ","); p; p = strtok(NULL, ",")) {
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549 if (strcmp(p, "fmod") == 0) {
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550 fce_ev_enabled |= (1 << FCE_FILE_MODIFY);
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551 } else if (strcmp(p, "fdel") == 0) {
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552 fce_ev_enabled |= (1 << FCE_FILE_DELETE);
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553 } else if (strcmp(p, "ddel") == 0) {
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554 fce_ev_enabled |= (1 << FCE_DIR_DELETE);
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555 } else if (strcmp(p, "fcre") == 0) {
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556 fce_ev_enabled |= (1 << FCE_FILE_CREATE);
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557 } else if (strcmp(p, "dcre") == 0) {
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558 fce_ev_enabled |= (1 << FCE_DIR_CREATE);
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559 } else if (strcmp(p, "tmsz") == 0) {
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560 fce_ev_enabled |= (1 << FCE_TM_SIZE);
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567 #ifdef FCE_TEST_MAIN
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570 void shortsleep( unsigned int us )
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574 int main( int argc, char*argv[] )
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578 char *port = FCE_DEFAULT_PORT_STRING;
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579 char *host = "localhost";
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580 int delay_between_events = 1000;
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581 int event_code = FCE_FILE_MODIFY;
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582 char pathbuff[1024];
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583 int duration_in_seconds = 0; // TILL ETERNITY
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585 char *path = getcwd( pathbuff, sizeof(pathbuff) );
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587 // FULLSPEED TEST IS "-s 1001" -> delay is 0 -> send packets without pause
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589 while ((c = getopt(argc, argv, "d:e:h:p:P:s:")) != -1) {
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592 fprintf(stdout, "%s: [ -p Port -h Listener1 [ -h Listener2 ...] -P path -s Delay_between_events_in_us -e event_code -d Duration ]\n", argv[0]);
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596 duration_in_seconds = atoi(optarg);
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599 event_code = atoi(optarg);
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602 host = strdup(optarg);
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605 port = strdup(optarg);
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608 path = strdup(optarg);
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611 delay_between_events = atoi(optarg);
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616 sprintf(target, "%s:%s", host, port);
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617 if (fce_add_udp_socket(target) != 0)
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621 time_t start_time = time(NULL);
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622 time_t end_time = 0;
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624 if (duration_in_seconds)
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625 end_time = start_time + duration_in_seconds;
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629 time_t now = time(NULL);
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630 if (now > start_time)
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633 fprintf( stdout, "%d events/s\n", ev_cnt );
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636 if (end_time && now >= end_time)
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639 register_fce( path, 0, event_code );
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643 shortsleep( delay_between_events );
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646 #endif /* TESTMAIN*/
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