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 */
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <arpa/inet.h>
29 #include <netinet/in.h>
34 #include <atalk/logger.h>
36 static char ipv4mapprefix[] = {0,0,0,0,0,0,0,0,0,0,0xff,0xff};
39 * @brief set or unset non-blocking IO on a fd
41 * @param fd (r) File descriptor
42 * @param cmd (r) 0: disable non-blocking IO, ie block\n
43 * <>0: enable non-blocking IO
45 * @returns 0 on success, -1 on failure
47 int setnonblock(int fd, int cmd)
52 if ((fdflags = ofdflags = fcntl(fd, F_GETFL, 0)) == -1)
56 fdflags |= O_NONBLOCK;
58 fdflags &= ~O_NONBLOCK;
60 if (fdflags != ofdflags)
61 if (fcntl(fd, F_SETFL, fdflags) == -1)
68 * non-blocking drop-in replacement for read with timeout using select
70 * @param socket (r) must be nonblocking !
71 * @param data (rw) buffer for the read data
72 * @param lenght (r) how many bytes to read
73 * @param timeout (r) number of seconds to try reading
75 * @returns number of bytes actually read or -1 on fatal error
77 ssize_t readt(int socket, void *data, const size_t length, int timeout)
87 while (stored < length) {
88 len = read(socket, (char *) data + stored, length - stored);
98 FD_SET(socket, &rfds);
99 while ((ret = select(socket + 1, &rfds, NULL, NULL, &tv)) < 1) {
102 LOG(log_warning, logtype_cnid, "select timeout 1s");
105 LOG(log_error, logtype_cnid, "select: %s", strerror(errno));
111 LOG(log_error, logtype_cnid, "read: %s", strerror(errno));
123 * @brief convert an IPv4 or IPv6 address to a static string using inet_ntop
125 * IPv6 mapped IPv4 addresses are returned as IPv4 addreses eg
126 * ::ffff:10.0.0.0 is returned as "10.0.0.0".
128 * @param sa (r) pointer to an struct sockaddr
130 * @returns pointer to a static string cotaining the converted address as string.\n
131 * On error pointers to "0.0.0.0" or "::0" are returned.
133 const char *getip_string(const struct sockaddr *sa)
135 static char ip4[INET_ADDRSTRLEN];
136 static char ip6[INET6_ADDRSTRLEN];
138 switch (sa->sa_family) {
141 const struct sockaddr_in *sai4 = (const struct sockaddr_in *)sa;
142 if ((inet_ntop(AF_INET, &(sai4->sin_addr), ip4, INET_ADDRSTRLEN)) == NULL)
147 const struct sockaddr_in6 *sai6 = (const struct sockaddr_in6 *)sa;
148 if ((inet_ntop(AF_INET6, &(sai6->sin6_addr), ip6, INET6_ADDRSTRLEN)) == NULL)
151 /* Deal with IPv6 mapped IPv4 addresses*/
152 if ((memcmp(sai6->sin6_addr.s6_addr, ipv4mapprefix, sizeof(ipv4mapprefix))) == 0)
153 return (strrchr(ip6, ':') + 1);
157 return "getip_string ERROR";
160 /* We never get here */
164 * @brief return port number from struct sockaddr
166 * @param sa (r) pointer to an struct sockaddr
168 * @returns port as unsigned int
170 unsigned int getip_port(const struct sockaddr *sa)
172 if (sa->sa_family == AF_INET) { /* IPv4 */
173 const struct sockaddr_in *sai4 = (const struct sockaddr_in *)sa;
174 return ntohs(sai4->sin_port);
176 const struct sockaddr_in6 *sai6 = (const struct sockaddr_in6 *)sa;
177 return ntohs(sai6->sin6_port);
180 /* We never get here */
184 * @brief apply netmask to IP (v4 or v6)
186 * Modifies IP address in sa->sin[6]_addr-s[6]_addr. The caller is responsible
187 * for passing a value for mask that is sensible to the passed address,
188 * eg 0 <= mask <= 32 for IPv4 or 0<= mask <= 128 for IPv6. mask > 32 for
189 * IPv4 is treated as mask = 32, mask > 128 is set to 128 for IPv6.
191 * @param ai (rw) pointer to an struct sockaddr
192 * @parma mask (r) number of maskbits
194 void apply_ip_mask(struct sockaddr *sa, uint32_t mask)
197 switch (sa->sa_family) {
202 struct sockaddr_in *si = (struct sockaddr_in *)sa;
203 uint32_t nmask = mask ? ~((1 << (32 - mask)) - 1) : 0;
204 si->sin_addr.s_addr &= htonl(nmask);
211 int i, maskbytes, maskbits;
212 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)sa;
214 /* Deal with IPv6 mapped IPv4 addresses*/
215 if ((memcmp(si6->sin6_addr.s6_addr, ipv4mapprefix, sizeof(ipv4mapprefix))) == 0) {
221 maskbytes = (128 - mask) / 8; /* maskbytes really are those that will be 0'ed */
224 for (i = maskbytes - 1; i >= 0; i--)
225 si6->sin6_addr.s6_addr[15 - i] = 0;
227 si6->sin6_addr.s6_addr[15 - maskbytes] &= ~((1 << (8 - maskbits)) - 1);
236 * @brief compare IP addresses for equality
238 * @param sa1 (r) pointer to an struct sockaddr
239 * @param sa2 (r) pointer to an struct sockaddr
241 * @returns Addresses are converted to strings and compared with strcmp and
242 * the result of strcmp is returned.
244 * @note IPv6 mapped IPv4 addresses are treated as IPv4 addresses.
246 int compare_ip(const struct sockaddr *sa1, const struct sockaddr *sa2)
252 ip1 = strdup(getip_string(sa1));
253 ip2 = getip_string(sa2);
255 ret = strcmp(ip1, ip2);