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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53 #include "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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70 static const char *skip_files[] =
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78 * Initialize network structs for any listeners
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79 * We dont give return code because all errors are handled internally (I hope..)
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85 struct addrinfo hints, *servinfo, *p;
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87 if (udp_initialized == FCE_TRUE)
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90 memset(&hints, 0, sizeof hints);
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91 hints.ai_family = AF_UNSPEC;
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92 hints.ai_socktype = SOCK_DGRAM;
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94 for (int i = 0; i < udp_sockets; i++) {
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95 struct udp_entry *udp_entry = udp_socket_list + i;
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97 /* Close any pending sockets */
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98 if (udp_entry->sock != -1)
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99 close(udp_entry->sock);
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101 if ((rv = getaddrinfo(udp_entry->addr, udp_entry->port, &hints, &servinfo)) != 0) {
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102 LOG(log_error, logtype_afpd, "fce_init_udp: getaddrinfo(%s:%s): %s",
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103 udp_entry->addr, udp_entry->port, gai_strerror(rv));
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107 /* loop through all the results and make a socket */
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108 for (p = servinfo; p != NULL; p = p->ai_next) {
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109 if ((udp_entry->sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
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110 LOG(log_error, logtype_afpd, "fce_init_udp: socket(%s:%s): %s",
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111 udp_entry->addr, udp_entry->port, strerror(errno));
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118 LOG(log_error, logtype_afpd, "fce_init_udp: no socket for %s:%s",
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119 udp_entry->addr, udp_entry->port);
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121 memcpy(&udp_entry->addrinfo, p, sizeof(struct addrinfo));
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122 freeaddrinfo(servinfo);
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125 udp_initialized = FCE_TRUE;
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130 if (udp_initialized == FCE_FALSE )
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133 for (int i = 0; i < udp_sockets; i++)
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135 struct udp_entry *udp_entry = udp_socket_list + i;
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137 /* Close any pending sockets */
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138 if (udp_entry->sock != -1)
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140 close( udp_entry->sock );
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141 udp_entry->sock = -1;
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144 udp_initialized = FCE_FALSE;
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149 * Construct a UDP packet for our listeners and return packet size
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151 static unsigned short build_fce_packet( struct fce_packet *packet, char *path, int mode, uint32_t event_id )
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153 unsigned short data_len = 0;
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155 strncpy(packet->magic, FCE_PACKET_MAGIC, sizeof(packet->magic) );
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156 packet->version = FCE_PACKET_VERSION;
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157 packet->mode = mode;
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159 data_len = strlen( path );
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161 /* This should never happen, but before we bust this server, we send nonsense, fce listener has to cope */
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162 if (data_len >= FCE_MAX_PATH_LEN)
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164 data_len = FCE_MAX_PATH_LEN - 1;
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167 /* This is the payload len. Means: the stream has len bytes more until packet is finished */
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168 /* A server should read the first 16 byte, decode them and then fetch the rest */
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169 packet->len = htons( data_len);
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170 packet->event_id = htonl( event_id );
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172 strncpy( packet->data, path, data_len );
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174 /* return the packet len */
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175 return sizeof(struct fce_packet) - FCE_MAX_PATH_LEN + data_len;
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179 * Send the fce information to all (connected) listeners
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180 * We dont give return code because all errors are handled internally (I hope..)
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182 static void send_fce_event( char *path, int mode )
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184 struct fce_packet packet;
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185 void *data = &packet;
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186 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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188 time_t now = time(NULL);
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190 /* build our data packet */
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191 int data_len = build_fce_packet( &packet, path, mode, ++event_id );
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194 for (int i = 0; i < udp_sockets; i++)
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197 struct udp_entry *udp_entry = udp_socket_list + i;
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199 /* we had a problem earlier ? */
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200 if (udp_entry->sock == -1)
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202 /* We still have to wait ?*/
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203 if (now < udp_entry->next_try_on_error)
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206 /* Reopen socket */
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207 udp_entry->sock = socket( AF_INET, SOCK_DGRAM, 0 );
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209 if (udp_entry->sock == -1)
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211 /* failed again, so go to rest again */
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212 LOG(log_error, logtype_afpd, "Cannot recreate socket for fce UDP connection: errno %d", errno );
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214 udp_entry->next_try_on_error = now + FCE_SOCKET_RETRY_DELAY_S;
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218 udp_entry->next_try_on_error = 0;
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220 /* Okay, we have a running socket again, send server that we had a problem on our side*/
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221 data_len = build_fce_packet( &packet, "", FCE_CONN_BROKEN, 0 );
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223 sendto(udp_entry->sock,
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227 udp_entry->addrinfo.ai_addr,
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228 udp_entry->addrinfo.ai_addrlen);
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230 /* Rebuild our original data packet */
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231 data_len = build_fce_packet( &packet, path, mode, event_id );
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234 sent_data = sendto(udp_entry->sock,
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238 udp_entry->addrinfo.ai_addr,
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239 udp_entry->addrinfo.ai_addrlen);
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242 if (sent_data != data_len)
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244 /* Argh, socket broke, we close and retry later */
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245 LOG(log_error, logtype_afpd, "Error while sending packet to %s for fce UDP connection: transfered: %d of %d errno %d",
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246 udp_entry->port, sent_data, data_len, errno );
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248 close( udp_entry->sock );
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249 udp_entry->sock = -1;
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250 udp_entry->next_try_on_error = now + FCE_SOCKET_RETRY_DELAY_S;
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255 static int add_udp_socket(const char *target_ip, const char *target_port )
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257 if (target_port == NULL)
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258 target_port = FCE_DEFAULT_PORT_STRING;
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260 if (udp_sockets >= FCE_MAX_UDP_SOCKS) {
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261 LOG(log_error, logtype_afpd, "Too many file change api UDP connections (max %d allowed)", FCE_MAX_UDP_SOCKS );
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262 return AFPERR_PARAM;
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265 udp_socket_list[udp_sockets].addr = strdup(target_ip);
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266 udp_socket_list[udp_sockets].port = strdup(target_port);
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267 udp_socket_list[udp_sockets].sock = -1;
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268 memset( &udp_socket_list[udp_sockets].addrinfo, 0, sizeof(struct sockaddr_in) );
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269 udp_socket_list[udp_sockets].next_try_on_error = 0;
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278 * Dispatcher for all incoming file change events
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281 static int register_fce( char *u_name, int is_dir, int mode )
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283 if (udp_sockets == 0)
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284 /* No listeners configured */
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287 if (u_name == NULL)
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288 return AFPERR_PARAM;
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290 static int first_event = FCE_TRUE;
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292 /* do some initialization on the fly the first time */
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295 fce_initialize_history();
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299 /* handle files which should not cause events (.DS_Store atc. ) */
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300 for (int i = 0; skip_files[i] != NULL; i++)
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302 if (!strcmp( u_name, skip_files[i]))
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307 char full_path_buffer[FCE_MAX_PATH_LEN + 1] = {""};
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308 const char *cwd = getcwdpath();
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310 if (!is_dir || mode == FCE_DIR_DELETE)
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312 if (strlen( cwd ) + strlen( u_name) + 1 >= FCE_MAX_PATH_LEN)
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314 LOG(log_error, logtype_afpd, "FCE file name too long: %s/%s", cwd, u_name );
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315 return AFPERR_PARAM;
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317 sprintf( full_path_buffer, "%s/%s", cwd, u_name );
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321 if (strlen( cwd ) >= FCE_MAX_PATH_LEN)
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323 LOG(log_error, logtype_afpd, "FCE directory name too long: %s", cwd);
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324 return AFPERR_PARAM;
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326 strcpy( full_path_buffer, cwd);
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329 /* Can we ignore this event based on type or history? */
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330 if (fce_handle_coalescation( full_path_buffer, is_dir, mode ))
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332 LOG(log_debug9, logtype_afpd, "Coalesced fc event <%d> for <%s>", mode, full_path_buffer );
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336 LOG(log_debug9, logtype_afpd, "Detected fc event <%d> for <%s>", mode, full_path_buffer );
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339 /* we do initilization on the fly, no blocking calls in here
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340 * (except when using FQDN in broken DNS environment)
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342 if (first_event == FCE_TRUE)
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346 /* Notify listeners the we start from the beginning */
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347 send_fce_event( "", FCE_CONN_START );
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349 first_event = FCE_FALSE;
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352 /* Handle UDP transport */
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353 send_fce_event( full_path_buffer, mode );
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359 /******************** External calls start here **************************/
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362 * API-Calls for file change api, called form outside (file.c directory.c ofork.c filedir.c)
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364 #ifndef FCE_TEST_MAIN
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367 int fce_register_delete_file( struct path *path )
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372 return AFPERR_PARAM;
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375 ret = register_fce( path->u_name, FALSE, FCE_FILE_DELETE );
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379 int fce_register_delete_dir( char *name )
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384 return AFPERR_PARAM;
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387 ret = register_fce( name, TRUE, FCE_DIR_DELETE);
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392 int fce_register_new_dir( struct path *path )
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397 return AFPERR_PARAM;
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399 ret = register_fce( path->u_name, TRUE, FCE_DIR_CREATE );
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405 int fce_register_new_file( struct path *path )
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410 return AFPERR_PARAM;
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412 ret = register_fce( path->u_name, FALSE, FCE_FILE_CREATE );
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418 int fce_register_file_modification( struct ofork *ofork )
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420 char *u_name = NULL;
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424 if (ofork == NULL || ofork->of_vol == NULL)
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425 return AFPERR_PARAM;
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427 vol = ofork->of_vol;
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429 if (NULL == (u_name = mtoupath(vol, of_name(ofork), ofork->of_did, utf8_encoding())))
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431 return AFPERR_MISC;
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434 ret = register_fce( u_name, FALSE, FCE_FILE_MODIFY );
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442 * Extern connect to afpd parameter, can be called multiple times for multiple listeners (up to MAX_UDP_SOCKS times)
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445 int fce_add_udp_socket(const char *target)
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447 const char *port = FCE_DEFAULT_PORT_STRING;
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448 char target_ip[256] = {""};
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450 strncpy(target_ip, target, sizeof(target_ip) -1);
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452 char *port_delim = strchr( target_ip, ':' );
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455 port = port_delim + 1;
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457 return add_udp_socket(target_ip, port);
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462 #ifdef FCE_TEST_MAIN
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465 void shortsleep( unsigned int us )
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469 int main( int argc, char*argv[] )
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473 char *port = FCE_DEFAULT_PORT_STRING;
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474 char *host = "localhost";
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475 int delay_between_events = 1000;
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476 int event_code = FCE_FILE_MODIFY;
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477 char pathbuff[1024];
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478 int duration_in_seconds = 0; // TILL ETERNITY
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480 char *path = getcwd( pathbuff, sizeof(pathbuff) );
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482 // FULLSPEED TEST IS "-s 1001" -> delay is 0 -> send packets without pause
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484 while ((c = getopt(argc, argv, "d:e:h:p:P:s:")) != -1) {
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487 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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491 duration_in_seconds = atoi(optarg);
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494 event_code = atoi(optarg);
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497 host = strdup(optarg);
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500 port = strdup(optarg);
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503 path = strdup(optarg);
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506 delay_between_events = atoi(optarg);
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511 sprintf(target, "%s:%s", host, port);
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512 if (fce_add_udp_socket(target) != 0)
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516 time_t start_time = time(NULL);
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517 time_t end_time = 0;
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519 if (duration_in_seconds)
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520 end_time = start_time + duration_in_seconds;
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524 time_t now = time(NULL);
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525 if (now > start_time)
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528 fprintf( stdout, "%d events/s\n", ev_cnt );
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531 if (end_time && now >= end_time)
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534 register_fce( path, 0, event_code );
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538 shortsleep( delay_between_events );
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541 #endif /* TESTMAIN*/
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