2 Copyright (c) 2009 Frank Lahm <franklahm@gmail.com>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
17 * Netatalk utility functions
22 #endif /* HAVE_CONFIG_H */
24 #include <atalk/standards.h>
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <arpa/inet.h>
31 #include <netinet/in.h>
37 #include <sys/ioctl.h>
39 #include <atalk/logger.h>
40 #include <atalk/util.h>
42 static char ipv4mapprefix[] = {0,0,0,0,0,0,0,0,0,0,0xff,0xff};
45 * @brief set or unset non-blocking IO on a fd
47 * @param fd (r) File descriptor
48 * @param cmd (r) 0: disable non-blocking IO, ie block\n
49 * <>0: enable non-blocking IO
51 * @returns 0 on success, -1 on failure
53 int setnonblock(int fd, int cmd)
58 if ((fdflags = ofdflags = fcntl(fd, F_GETFL, 0)) == -1)
62 fdflags |= O_NONBLOCK;
64 fdflags &= ~O_NONBLOCK;
66 if (fdflags != ofdflags)
67 if (fcntl(fd, F_SETFL, fdflags) == -1)
74 * non-blocking drop-in replacement for read with timeout using select
76 * @param socket (r) socket, if in blocking mode, pass "setnonblocking" arg as 1
77 * @param data (rw) buffer for the read data
78 * @param lenght (r) how many bytes to read
79 * @param setnonblocking (r) when non-zero this func will enable and disable non blocking
80 * io mode for the socket
81 * @param timeout (r) number of seconds to try reading
83 * @returns number of bytes actually read or -1 on timeout or error
85 ssize_t readt(int socket, void *data, const size_t length, int setnonblocking, int timeout)
89 struct timeval now, end, tv;
96 if (setnonblock(socket, 1) != 0)
100 /* Calculate end time */
101 (void)gettimeofday(&now, NULL);
103 end.tv_sec += timeout;
105 while (stored < length) {
106 len = read(socket, (char *) data + stored, length - stored);
112 FD_SET(socket, &rfds);
116 while ((ret = select(socket + 1, &rfds, NULL, NULL, &tv)) < 1) {
119 LOG(log_debug, logtype_afpd, "select timeout %d s", timeout);
126 (void)gettimeofday(&now, NULL);
127 if (now.tv_sec > end.tv_sec
129 (now.tv_sec == end.tv_sec && now.tv_usec >= end.tv_usec)) {
130 LOG(log_debug, logtype_afpd, "select timeout %d s", timeout);
133 if (now.tv_usec > end.tv_usec) {
134 tv.tv_usec = 1000000 + end.tv_usec - now.tv_usec;
135 tv.tv_sec = end.tv_sec - now.tv_sec - 1;
137 tv.tv_usec = end.tv_usec - now.tv_usec;
138 tv.tv_sec = end.tv_sec - now.tv_sec;
140 FD_SET(socket, &rfds);
143 /* possibly entered disconnected state, don't spam log here */
144 LOG(log_debug, logtype_afpd, "select: %s", strerror(errno));
148 LOG(log_error, logtype_afpd, "select: %s", strerror(errno));
153 } /* while (select) */
155 } /* switch (errno) */
156 LOG(log_error, logtype_afpd, "read: %s", strerror(errno));
164 } /* while (stored < length) */
167 if (setnonblocking) {
168 if (setnonblock(socket, 0) != 0)
172 if (len == -1 && stored == 0)
173 /* last read or select got an error and we haven't got yet anything => return -1*/
179 * non-blocking drop-in replacement for read with timeout using select
181 * @param socket (r) socket, if in blocking mode, pass "setnonblocking" arg as 1
182 * @param data (rw) buffer for the read data
183 * @param lenght (r) how many bytes to read
184 * @param setnonblocking (r) when non-zero this func will enable and disable non blocking
185 * io mode for the socket
186 * @param timeout (r) number of seconds to try reading
188 * @returns number of bytes actually read or -1 on fatal error
190 ssize_t writet(int socket, void *data, const size_t length, int setnonblocking, int timeout)
194 struct timeval now, end, tv;
198 if (setnonblocking) {
199 if (setnonblock(socket, 1) != 0)
203 /* Calculate end time */
204 (void)gettimeofday(&now, NULL);
206 end.tv_sec += timeout;
208 while (stored < length) {
209 len = write(socket, (char *) data + stored, length - stored);
216 FD_SET(socket, &rfds);
220 while ((ret = select(socket + 1, &rfds, NULL, NULL, &tv)) < 1) {
223 LOG(log_warning, logtype_afpd, "select timeout %d s", timeout);
227 if (errno == EINTR) {
228 (void)gettimeofday(&now, NULL);
229 if (now.tv_sec >= end.tv_sec && now.tv_usec >= end.tv_usec) {
230 LOG(log_warning, logtype_afpd, "select timeout %d s", timeout);
233 if (now.tv_usec > end.tv_usec) {
234 tv.tv_usec = 1000000 + end.tv_usec - now.tv_usec;
235 tv.tv_sec = end.tv_sec - now.tv_sec - 1;
237 tv.tv_usec = end.tv_usec - now.tv_usec;
238 tv.tv_sec = end.tv_sec - now.tv_sec;
241 FD_SET(socket, &rfds);
244 LOG(log_error, logtype_afpd, "select: %s", strerror(errno));
248 } /* while (select) */
250 } /* switch (errno) */
251 LOG(log_error, logtype_afpd, "read: %s", strerror(errno));
259 } /* while (stored < length) */
262 if (setnonblocking) {
263 if (setnonblock(socket, 0) != 0)
267 if (len == -1 && stored == 0)
268 /* last read or select got an error and we haven't got yet anything => return -1*/
274 * @brief convert an IPv4 or IPv6 address to a static string using inet_ntop
276 * IPv6 mapped IPv4 addresses are returned as IPv4 addreses eg
277 * ::ffff:10.0.0.0 is returned as "10.0.0.0".
279 * @param sa (r) pointer to an struct sockaddr
281 * @returns pointer to a static string cotaining the converted address as string.\n
282 * On error pointers to "0.0.0.0" or "::0" are returned.
284 const char *getip_string(const struct sockaddr *sa)
286 static char ip4[INET_ADDRSTRLEN];
287 static char ip6[INET6_ADDRSTRLEN];
289 switch (sa->sa_family) {
292 const struct sockaddr_in *sai4 = (const struct sockaddr_in *)sa;
293 if ((inet_ntop(AF_INET, &(sai4->sin_addr), ip4, INET_ADDRSTRLEN)) == NULL)
298 const struct sockaddr_in6 *sai6 = (const struct sockaddr_in6 *)sa;
299 if ((inet_ntop(AF_INET6, &(sai6->sin6_addr), ip6, INET6_ADDRSTRLEN)) == NULL)
302 /* Deal with IPv6 mapped IPv4 addresses*/
303 if ((memcmp(sai6->sin6_addr.s6_addr, ipv4mapprefix, sizeof(ipv4mapprefix))) == 0)
304 return (strrchr(ip6, ':') + 1);
308 return "getip_string ERROR";
311 /* We never get here */
315 * @brief return port number from struct sockaddr
317 * @param sa (r) pointer to an struct sockaddr
319 * @returns port as unsigned int
321 unsigned int getip_port(const struct sockaddr *sa)
323 if (sa->sa_family == AF_INET) { /* IPv4 */
324 const struct sockaddr_in *sai4 = (const struct sockaddr_in *)sa;
325 return ntohs(sai4->sin_port);
327 const struct sockaddr_in6 *sai6 = (const struct sockaddr_in6 *)sa;
328 return ntohs(sai6->sin6_port);
331 /* We never get here */
335 * @brief apply netmask to IP (v4 or v6)
337 * Modifies IP address in sa->sin[6]_addr-s[6]_addr. The caller is responsible
338 * for passing a value for mask that is sensible to the passed address,
339 * eg 0 <= mask <= 32 for IPv4 or 0<= mask <= 128 for IPv6. mask > 32 for
340 * IPv4 is treated as mask = 32, mask > 128 is set to 128 for IPv6.
342 * @param ai (rw) pointer to an struct sockaddr
343 * @parma mask (r) number of maskbits
345 void apply_ip_mask(struct sockaddr *sa, int mask)
348 switch (sa->sa_family) {
353 struct sockaddr_in *si = (struct sockaddr_in *)sa;
354 uint32_t nmask = mask ? ~((1 << (32 - mask)) - 1) : 0;
355 si->sin_addr.s_addr &= htonl(nmask);
362 int i, maskbytes, maskbits;
363 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)sa;
365 /* Deal with IPv6 mapped IPv4 addresses*/
366 if ((memcmp(si6->sin6_addr.s6_addr, ipv4mapprefix, sizeof(ipv4mapprefix))) == 0) {
372 maskbytes = (128 - mask) / 8; /* maskbytes really are those that will be 0'ed */
375 for (i = maskbytes - 1; i >= 0; i--)
376 si6->sin6_addr.s6_addr[15 - i] = 0;
378 si6->sin6_addr.s6_addr[15 - maskbytes] &= ~((1 << (8 - maskbits)) - 1);
387 * @brief compare IP addresses for equality
389 * @param sa1 (r) pointer to an struct sockaddr
390 * @param sa2 (r) pointer to an struct sockaddr
392 * @returns Addresses are converted to strings and compared with strcmp and
393 * the result of strcmp is returned.
395 * @note IPv6 mapped IPv4 addresses are treated as IPv4 addresses.
397 int compare_ip(const struct sockaddr *sa1, const struct sockaddr *sa2)
403 ip1 = strdup(getip_string(sa1));
404 ip2 = getip_string(sa2);
406 ret = strcmp(ip1, ip2);
414 * Add a fd to a dynamic pollfd array that is allocated and grown as needed
416 * This uses an additional array of struct polldata which stores type information
417 * (enum fdtype) and a pointer to anciliary user data.
419 * 1. Allocate the arrays with the size of "maxconns" if *fdsetp is NULL.
420 * 2. Fill in both array elements and increase count of used elements
422 * @param maxconns (r) maximum number of connections, determines array size
423 * @param fdsetp (rw) pointer to callers pointer to the pollfd array
424 * @param polldatap (rw) pointer to callers pointer to the polldata array
425 * @param fdset_usedp (rw) pointer to an int with the number of used elements
426 * @param fdset_sizep (rw) pointer to an int which stores the array sizes
427 * @param fd (r) file descriptor to add to the arrays
428 * @param fdtype (r) type of fd, currently IPC_FD or LISTEN_FD
429 * @param data (rw) pointer to data the caller want to associate with an fd
431 void fdset_add_fd(int maxconns,
432 struct pollfd **fdsetp,
433 struct polldata **polldatap,
440 struct pollfd *fdset = *fdsetp;
441 struct polldata *polldata = *polldatap;
442 int fdset_size = *fdset_sizep;
444 LOG(log_debug, logtype_default, "fdset_add_fd: adding fd %i in slot %i", fd, *fdset_usedp);
446 if (fdset == NULL) { /* 1 */
447 /* Initialize with space for all possibly active fds */
448 fdset = calloc(maxconns, sizeof(struct pollfd));
452 polldata = calloc(maxconns, sizeof(struct polldata));
456 fdset_size = maxconns;
458 *fdset_sizep = fdset_size;
460 *polldatap = polldata;
462 LOG(log_debug, logtype_default, "fdset_add_fd: initialized with space for %i conncections",
467 fdset[*fdset_usedp].fd = fd;
468 fdset[*fdset_usedp].events = POLLIN;
469 polldata[*fdset_usedp].fdtype = fdtype;
470 polldata[*fdset_usedp].data = data;
475 * Remove a fd from our pollfd array
478 * 2a Matched last (or only) in the set ? null it and return
479 * 2b If we remove the last array elemnt, just decrease count
480 * 3. If found move all following elements down by one
481 * 4. Decrease count of used elements in array
483 * This currently doesn't shrink the allocated storage of the array.
485 * @param fdsetp (rw) pointer to callers pointer to the pollfd array
486 * @param polldatap (rw) pointer to callers pointer to the polldata array
487 * @param fdset_usedp (rw) pointer to an int with the number of used elements
488 * @param fdset_sizep (rw) pointer to an int which stores the array sizes
489 * @param fd (r) file descriptor to remove from the arrays
491 void fdset_del_fd(struct pollfd **fdsetp,
492 struct polldata **polldatap,
494 int *fdset_sizep _U_,
497 struct pollfd *fdset = *fdsetp;
498 struct polldata *polldata = *polldatap;
500 if (*fdset_usedp < 1)
503 for (int i = 0; i < *fdset_usedp; i++) {
504 if (fdset[i].fd == fd) { /* 1 */
505 if ((i + 1) == *fdset_usedp) { /* 2a */
507 memset(&polldata[i], 0, sizeof(struct polldata));
508 } else if (i < (*fdset_usedp - 1)) { /* 2b */
511 (*fdset_usedp - i - 1) * sizeof(struct pollfd)); /* 3 */
512 memmove(&polldata[i],
514 (*fdset_usedp - i - 1) * sizeof(struct polldata)); /* 3 */
522 /* Length of the space taken up by a padded control message of length len */
524 #define CMSG_SPACE(len) (__CMSG_ALIGN(sizeof(struct cmsghdr)) + __CMSG_ALIGN(len))
528 * Receive a fd on a suitable socket
529 * @args fd (r) PF_UNIX socket to receive on
530 * @args nonblocking (r) 0: fd is in blocking mode - 1: fd is nonblocking, poll for 1 sec
531 * @returns fd on success, -1 on error
533 int recv_fd(int fd, int nonblocking)
538 struct cmsghdr *cmsgp = NULL;
539 char buf[CMSG_SPACE(sizeof(int))];
541 struct pollfd pollfds[1];
544 pollfds[0].events = POLLIN;
546 memset(&msgh,0,sizeof(msgh));
547 memset(buf,0,sizeof(buf));
549 msgh.msg_name = NULL;
550 msgh.msg_namelen = 0;
555 iov[0].iov_base = dbuf;
556 iov[0].iov_len = sizeof(dbuf);
558 msgh.msg_control = buf;
559 msgh.msg_controllen = sizeof(buf);
563 ret = poll(pollfds, 1, 2000); /* poll 2 seconds, evtl. multipe times (EINTR) */
564 } while ( ret == -1 && errno == EINTR );
567 ret = recvmsg(fd, &msgh, 0);
570 ret = recvmsg(fd, &msgh, 0);
571 } while ( ret == -1 && errno == EINTR );
578 for ( cmsgp = CMSG_FIRSTHDR(&msgh); cmsgp != NULL; cmsgp = CMSG_NXTHDR(&msgh,cmsgp) ) {
579 if ( cmsgp->cmsg_level == SOL_SOCKET && cmsgp->cmsg_type == SCM_RIGHTS ) {
580 return *(int *) CMSG_DATA(cmsgp);
584 if ( ret == sizeof (int) )
585 errno = *(int *)dbuf; /* Rcvd errno */
587 errno = ENOENT; /* Default errno */
593 * Send a fd across a suitable socket
595 int send_fd(int socket, int fd)
600 struct cmsghdr *cmsgp = NULL;
605 size = CMSG_SPACE(sizeof fd);
608 LOG(log_error, logtype_cnid, "error in sendmsg: %s", strerror(errno));
612 memset(&msgh,0,sizeof (msgh));
615 msgh.msg_name = NULL;
616 msgh.msg_namelen = 0;
621 iov[0].iov_base = &er;
622 iov[0].iov_len = sizeof(er);
624 msgh.msg_control = buf;
625 msgh.msg_controllen = size;
627 cmsgp = CMSG_FIRSTHDR(&msgh);
628 cmsgp->cmsg_level = SOL_SOCKET;
629 cmsgp->cmsg_type = SCM_RIGHTS;
630 cmsgp->cmsg_len = CMSG_LEN(sizeof(fd));
632 *((int *)CMSG_DATA(cmsgp)) = fd;
633 msgh.msg_controllen = cmsgp->cmsg_len;
636 ret = sendmsg(socket,&msgh, 0);
637 } while ( ret == -1 && errno == EINTR );
639 LOG(log_error, logtype_cnid, "error in sendmsg: %s", strerror(errno));