2 * Amanda, The Advanced Maryland Automatic Network Disk Archiver
3 * Copyright (c) 1991-1999 University of Maryland at College Park
6 * Permission to use, copy, modify, distribute, and sell this software and its
7 * documentation for any purpose is hereby granted without fee, provided that
8 * the above copyright notice appear in all copies and that both that
9 * copyright notice and this permission notice appear in supporting
10 * documentation, and that the name of U.M. not be used in advertising or
11 * publicity pertaining to distribution of the software without specific,
12 * written prior permission. U.M. makes no representations about the
13 * suitability of this software for any purpose. It is provided "as is"
14 * without express or implied warranty.
16 * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
18 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
20 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
21 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * Author: James da Silva, Systems Design and Analysis Group
24 * Computer Science Department
25 * University of Maryland at College Park
28 * $Id: dgram.c,v 1.32 2006/07/05 19:54:20 martinea Exp $
30 * library routines to marshall/send, recv/unmarshall UDP packets
43 if(socket < 0 || socket >= FD_SETSIZE) {
44 error("dgram_socket: socket %d out of range (0 .. %d)\n",
45 socket, FD_SETSIZE-1);
48 dgram->socket = socket;
60 struct sockaddr_storage name;
64 portrange = getconf_intrange(CNF_RESERVED_UDP_PORT);
65 *portp = (in_port_t)0;
66 if((s = socket(family, SOCK_DGRAM, 0)) == -1) {
68 dbprintf(("%s: dgram_bind: socket() failed: %s\n",
69 debug_prefix_time(NULL),
70 strerror(save_errno)));
74 if(s < 0 || s >= (int)FD_SETSIZE) {
75 dbprintf(("%s: dgram_bind: socket out of range: %d\n",
76 debug_prefix_time(NULL),
79 errno = EMFILE; /* out of range */
83 SS_INIT(&name, family);
84 SS_SET_INADDR_ANY(&name);
87 * If a port range was specified, we try to get a port in that
88 * range first. Next, we try to get a reserved port. If that
89 * fails, we just go for any port.
91 * In all cases, not to use port that's assigned to other services.
93 * It is up to the caller to make sure we have the proper permissions
94 * to get the desired port, and to make sure we return a port that
95 * is within the range it requires.
97 for (retries = 0; ; retries++) {
98 if (bind_portrange(s, &name, portrange[0], portrange[1], "udp") == 0)
100 dbprintf(("%s: dgram_bind: Could not bind to port in range: %d - %d.\n",
101 debug_prefix_time(NULL), portrange[0], portrange[1]));
102 if (retries >= BIND_CYCLE_RETRIES) {
103 dbprintf(("%s: dgram_bind: Giving up...\n",
104 debug_prefix_time(NULL)));
108 dbprintf(("%s: dgram_bind: Retrying entire range after 10 second delay.\n",
109 debug_prefix_time(NULL)));
114 dbprintf(("%s: dgram_bind: bind(in6addr_any) failed: %s\n",
115 debug_prefix_time(NULL),
116 strerror(save_errno)));
122 /* find out what name was actually used */
124 len = (socklen_t)sizeof(name);
125 if(getsockname(s, (struct sockaddr *)&name, &len) == -1) {
127 dbprintf(("%s: dgram_bind: getsockname() failed: %s\n",
128 debug_prefix_time(NULL),
129 strerror(save_errno)));
134 *portp = SS_GET_PORT(&name);
137 dbprintf(("%s: dgram_bind: socket %d bound to %s\n",
138 debug_prefix_time(NULL), dgram->socket, str_sockaddr(&name)));
145 struct sockaddr_storage *addr,
153 #if defined(USE_REUSEADDR)
158 dbprintf(("%s: dgram_send_addr(addr=%p, dgram=%p)\n",
159 debug_prefix_time(NULL), addr, dgram));
161 dbprintf(("%s: dgram_send_addr: %p->socket = %d\n",
162 debug_prefix_time(NULL), dgram, dgram->socket));
163 if(dgram->socket != -1) {
167 if((s = socket(addr->ss_family, SOCK_DGRAM, 0)) == -1) {
169 dbprintf(("%s: dgram_send_addr: socket() failed: %s\n",
170 debug_prefix_time(NULL),
171 strerror(save_errno)));
177 r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
178 (void *)&on, (socklen_t)sizeof(on));
180 dbprintf(("%s: dgram_send_addr: setsockopt(SO_REUSEADDR) failed: %s\n",
181 debug_prefix_time(NULL),
187 if(s < 0 || s >= FD_SETSIZE) {
188 dbprintf(("%s: dgram_send_addr: socket out of range: %d\n",
189 debug_prefix_time(NULL),
191 errno = EMFILE; /* out of range */
194 max_wait = 300 / 5; /* five minutes */
201 (struct sockaddr *)addr,
202 SS_LEN(addr)) == -1) {
204 if(errno == ECONNREFUSED && wait_count++ < max_wait) {
206 dbprintf(("%s: dgram_send_addr: sendto(%s): retry %d after ECONNREFUSED\n",
207 debug_prefix_time(NULL),
214 if(errno == EAGAIN && wait_count++ < max_wait) {
216 dbprintf(("%s: dgram_send_addr: sendto(%s): retry %d after EAGAIN\n",
217 debug_prefix_time(NULL),
224 dbprintf(("%s: dgram_send_addr: sendto(%s) failed: %s \n",
225 debug_prefix_time(NULL),
227 strerror(save_errno)));
237 dbprintf(("%s: dgram_send_addr: close(%s): failed: %s\n",
238 debug_prefix_time(NULL),
242 * Calling function should not care that the close failed.
243 * It does care about the send results though.
257 struct sockaddr_storage *fromaddr)
259 SELECT_ARG_TYPE ready;
267 sock = dgram->socket;
270 FD_SET(sock, &ready);
274 dbprintf(("%s: dgram_recv(dgram=%p, timeout=%u, fromaddr=%p)\n",
275 debug_prefix_time(NULL), dgram, timeout, fromaddr));
277 nfound = (ssize_t)select(sock+1, &ready, NULL, NULL, &to);
278 if(nfound <= 0 || !FD_ISSET(sock, &ready)) {
281 dbprintf(("%s: dgram_recv: select() failed: %s\n",
282 debug_prefix_time(NULL),
283 strerror(save_errno)));
284 } else if(nfound == 0) {
285 dbprintf(("%s: dgram_recv: timeout after %d second%s\n",
286 debug_prefix_time(NULL),
288 (timeout == 1) ? "" : "s"));
290 } else if (!FD_ISSET(sock, &ready)) {
293 for(i = 0; i < sock + 1; i++) {
294 if(FD_ISSET(i, &ready)) {
295 dbprintf(("%s: dgram_recv: got fd %d instead of %d\n",
296 debug_prefix_time(NULL),
308 addrlen = (socklen_t)sizeof(struct sockaddr_storage);
309 size = recvfrom(sock, dgram->data, (size_t)MAX_DGRAM, 0,
310 (struct sockaddr *)fromaddr, &addrlen);
313 dbprintf(("%s: dgram_recv: recvfrom() failed: %s\n",
314 debug_prefix_time(NULL),
315 strerror(save_errno)));
319 dump_sockaddr(fromaddr);
320 dgram->len = (size_t)size;
321 dgram->data[size] = '\0';
322 dgram->cur = dgram->data;
331 dgram->cur = dgram->data;
333 *(dgram->cur) = '\0';
336 printf_arglist_function1(int dgram_cat, dgram_t *, dgram, const char *, fmt)
342 assert(dgram != NULL);
345 assert(dgram->len == (size_t)(dgram->cur - dgram->data));
346 assert(dgram->len < SIZEOF(dgram->data));
348 bufsize = (ssize_t)(sizeof(dgram->data) - dgram->len);
352 arglist_start(argp, fmt);
353 len = vsnprintf(dgram->cur, (size_t)bufsize, fmt, argp);
357 } else if((ssize_t)len > bufsize) {
358 dgram->len = sizeof(dgram->data);
359 dgram->cur = dgram->data + dgram->len;
364 dgram->cur = dgram->data + dgram->len;
373 char *p = dgram->cur;
374 char *end = dgram->data + dgram->len;
376 while(p < end && *p && *p != '\n')