2 $Id: socket.c,v 1.6 2010-01-05 19:05:52 franklahm Exp $
3 Copyright (c) 2009 Frank Lahm <franklahm@gmail.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
18 * Netatalk utility functions
23 #endif /* HAVE_CONFIG_H */
27 #include <sys/types.h>
28 #include <sys/socket.h>
29 #include <arpa/inet.h>
30 #include <netinet/in.h>
37 #include <atalk/logger.h>
39 static char ipv4mapprefix[] = {0,0,0,0,0,0,0,0,0,0,0xff,0xff};
42 * @brief set or unset non-blocking IO on a fd
44 * @param fd (r) File descriptor
45 * @param cmd (r) 0: disable non-blocking IO, ie block\n
46 * <>0: enable non-blocking IO
48 * @returns 0 on success, -1 on failure
50 int setnonblock(int fd, int cmd)
55 if ((fdflags = ofdflags = fcntl(fd, F_GETFL, 0)) == -1)
59 fdflags |= O_NONBLOCK;
61 fdflags &= ~O_NONBLOCK;
63 if (fdflags != ofdflags)
64 if (fcntl(fd, F_SETFL, fdflags) == -1)
71 * non-blocking drop-in replacement for read with timeout using select
73 * @param socket (r) socket, if in blocking mode, pass "setnonblocking" arg as 1
74 * @param data (rw) buffer for the read data
75 * @param lenght (r) how many bytes to read
76 * @param setnonblocking (r) when non-zero this func will enable and disable non blocking
77 * io mode for the socket
78 * @param timeout (r) number of seconds to try reading
80 * @returns number of bytes actually read or -1 on fatal error
82 ssize_t readt(int socket, void *data, const size_t length, int setnonblocking, int timeout)
86 struct timeval now, end, tv;
93 if (setnonblock(socket, 1) != 0)
97 /* Calculate end time */
98 (void)gettimeofday(&now, NULL);
100 end.tv_sec += timeout;
102 while (stored < length) {
103 len = read(socket, (char *) data + stored, length - stored);
110 FD_SET(socket, &rfds);
114 while ((ret = select(socket + 1, &rfds, NULL, NULL, &tv)) < 1) {
117 LOG(log_warning, logtype_afpd, "select timeout %d s", timeout);
121 if (errno == EINTR) {
122 (void)gettimeofday(&now, NULL);
123 if (now.tv_sec >= end.tv_sec && now.tv_usec >= end.tv_usec) {
124 LOG(log_warning, logtype_afpd, "select timeout %d s", timeout);
127 if (now.tv_usec > end.tv_usec) {
128 tv.tv_usec = 1000000 + end.tv_usec - now.tv_usec;
129 tv.tv_sec = end.tv_sec - now.tv_sec - 1;
131 tv.tv_usec = end.tv_usec - now.tv_usec;
132 tv.tv_sec = end.tv_sec - now.tv_sec;
135 FD_SET(socket, &rfds);
138 LOG(log_error, logtype_afpd, "select: %s", strerror(errno));
142 } /* while (select) */
144 } /* switch (errno) */
145 LOG(log_error, logtype_afpd, "read: %s", strerror(errno));
153 } /* while (stored < length) */
156 if (setnonblocking) {
157 if (setnonblock(socket, 0) != 0)
161 if (len == -1 && stored == 0)
162 /* last read or select got an error and we haven't got yet anything => return -1*/
168 * @brief convert an IPv4 or IPv6 address to a static string using inet_ntop
170 * IPv6 mapped IPv4 addresses are returned as IPv4 addreses eg
171 * ::ffff:10.0.0.0 is returned as "10.0.0.0".
173 * @param sa (r) pointer to an struct sockaddr
175 * @returns pointer to a static string cotaining the converted address as string.\n
176 * On error pointers to "0.0.0.0" or "::0" are returned.
178 const char *getip_string(const struct sockaddr *sa)
180 static char ip4[INET_ADDRSTRLEN];
181 static char ip6[INET6_ADDRSTRLEN];
183 switch (sa->sa_family) {
186 const struct sockaddr_in *sai4 = (const struct sockaddr_in *)sa;
187 if ((inet_ntop(AF_INET, &(sai4->sin_addr), ip4, INET_ADDRSTRLEN)) == NULL)
192 const struct sockaddr_in6 *sai6 = (const struct sockaddr_in6 *)sa;
193 if ((inet_ntop(AF_INET6, &(sai6->sin6_addr), ip6, INET6_ADDRSTRLEN)) == NULL)
196 /* Deal with IPv6 mapped IPv4 addresses*/
197 if ((memcmp(sai6->sin6_addr.s6_addr, ipv4mapprefix, sizeof(ipv4mapprefix))) == 0)
198 return (strrchr(ip6, ':') + 1);
202 return "getip_string ERROR";
205 /* We never get here */
209 * @brief return port number from struct sockaddr
211 * @param sa (r) pointer to an struct sockaddr
213 * @returns port as unsigned int
215 unsigned int getip_port(const struct sockaddr *sa)
217 if (sa->sa_family == AF_INET) { /* IPv4 */
218 const struct sockaddr_in *sai4 = (const struct sockaddr_in *)sa;
219 return ntohs(sai4->sin_port);
221 const struct sockaddr_in6 *sai6 = (const struct sockaddr_in6 *)sa;
222 return ntohs(sai6->sin6_port);
225 /* We never get here */
229 * @brief apply netmask to IP (v4 or v6)
231 * Modifies IP address in sa->sin[6]_addr-s[6]_addr. The caller is responsible
232 * for passing a value for mask that is sensible to the passed address,
233 * eg 0 <= mask <= 32 for IPv4 or 0<= mask <= 128 for IPv6. mask > 32 for
234 * IPv4 is treated as mask = 32, mask > 128 is set to 128 for IPv6.
236 * @param ai (rw) pointer to an struct sockaddr
237 * @parma mask (r) number of maskbits
239 void apply_ip_mask(struct sockaddr *sa, uint32_t mask)
242 switch (sa->sa_family) {
247 struct sockaddr_in *si = (struct sockaddr_in *)sa;
248 uint32_t nmask = mask ? ~((1 << (32 - mask)) - 1) : 0;
249 si->sin_addr.s_addr &= htonl(nmask);
256 int i, maskbytes, maskbits;
257 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)sa;
259 /* Deal with IPv6 mapped IPv4 addresses*/
260 if ((memcmp(si6->sin6_addr.s6_addr, ipv4mapprefix, sizeof(ipv4mapprefix))) == 0) {
266 maskbytes = (128 - mask) / 8; /* maskbytes really are those that will be 0'ed */
269 for (i = maskbytes - 1; i >= 0; i--)
270 si6->sin6_addr.s6_addr[15 - i] = 0;
272 si6->sin6_addr.s6_addr[15 - maskbytes] &= ~((1 << (8 - maskbits)) - 1);
281 * @brief compare IP addresses for equality
283 * @param sa1 (r) pointer to an struct sockaddr
284 * @param sa2 (r) pointer to an struct sockaddr
286 * @returns Addresses are converted to strings and compared with strcmp and
287 * the result of strcmp is returned.
289 * @note IPv6 mapped IPv4 addresses are treated as IPv4 addresses.
291 int compare_ip(const struct sockaddr *sa1, const struct sockaddr *sa2)
297 ip1 = strdup(getip_string(sa1));
298 ip2 = getip_string(sa2);
300 ret = strcmp(ip1, ip2);