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-rw-r--r--babeld/util.c509
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+/*
+ * This file is free software: you may copy, redistribute and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+Copyright (c) 2007, 2008 by Juliusz Chroboczek
+Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "babel_main.h"
+#include "babeld.h"
+#include "util.h"
+
+unsigned
+roughly(unsigned value)
+{
+ return value * 3 / 4 + random() % (value / 2);
+}
+
+/* d = s1 - s2 */
+void
+timeval_minus(struct timeval *d,
+ const struct timeval *s1, const struct timeval *s2)
+{
+ if(s1->tv_usec >= s2->tv_usec) {
+ d->tv_usec = s1->tv_usec - s2->tv_usec;
+ d->tv_sec = s1->tv_sec - s2->tv_sec;
+ } else {
+ d->tv_usec = s1->tv_usec + 1000000 - s2->tv_usec;
+ d->tv_sec = s1->tv_sec - s2->tv_sec - 1;
+ }
+}
+
+unsigned
+timeval_minus_msec(const struct timeval *s1, const struct timeval *s2)
+{
+ if(s1->tv_sec < s2->tv_sec)
+ return 0;
+
+ /* Avoid overflow. */
+ if(s1->tv_sec - s2->tv_sec > 2000000)
+ return 2000000000;
+
+ if(s1->tv_sec > s2->tv_sec)
+ return
+ (unsigned)((unsigned)(s1->tv_sec - s2->tv_sec) * 1000 +
+ ((int)s1->tv_usec - s2->tv_usec) / 1000);
+
+ if(s1->tv_usec <= s2->tv_usec)
+ return 0;
+
+ return (unsigned)(s1->tv_usec - s2->tv_usec) / 1000u;
+}
+
+/* d = s + msecs */
+void
+timeval_add_msec(struct timeval *d, const struct timeval *s, const int msecs)
+{
+ int usecs;
+ d->tv_sec = s->tv_sec + msecs / 1000;
+ usecs = s->tv_usec + (msecs % 1000) * 1000;
+ if(usecs < 1000000) {
+ d->tv_usec = usecs;
+ } else {
+ d->tv_usec = usecs - 1000000;
+ d->tv_sec++;
+ }
+}
+
+void
+set_timeout(struct timeval *timeout, int msecs)
+{
+ timeval_add_msec(timeout, &babel_now, roughly(msecs));
+}
+
+/* returns <0 if "s1" < "s2", etc. */
+int
+timeval_compare(const struct timeval *s1, const struct timeval *s2)
+{
+ if(s1->tv_sec < s2->tv_sec)
+ return -1;
+ else if(s1->tv_sec > s2->tv_sec)
+ return 1;
+ else if(s1->tv_usec < s2->tv_usec)
+ return -1;
+ else if(s1->tv_usec > s2->tv_usec)
+ return 1;
+ else
+ return 0;
+}
+
+/* set d at min(d, s) */
+/* {0, 0} represents infinity */
+void
+timeval_min(struct timeval *d, const struct timeval *s)
+{
+ if(s->tv_sec == 0)
+ return;
+
+ if(d->tv_sec == 0 || timeval_compare(d, s) > 0) {
+ *d = *s;
+ }
+}
+
+/* set d to min(d, x) with x in [secs, secs+1] */
+void
+timeval_min_sec(struct timeval *d, time_t secs)
+{
+ if(d->tv_sec == 0 || d->tv_sec > secs) {
+ d->tv_sec = secs;
+ d->tv_usec = random() % 1000000;
+ }
+}
+
+/* parse a float value in second and return the corresponding mili-seconds.
+ For example:
+ parse_msec("12.342345") returns 12342 */
+int
+parse_msec(const char *string)
+{
+ unsigned int in, fl;
+ int i, j;
+
+ in = fl = 0;
+ i = 0;
+ while(string[i] == ' ' || string[i] == '\t')
+ i++;
+ while(string[i] >= '0' && string[i] <= '9') {
+ in = in * 10 + string[i] - '0';
+ i++;
+ }
+ if(string[i] == '.') {
+ i++;
+ j = 0;
+ while(string[i] >= '0' && string[i] <= '9') {
+ fl = fl * 10 + string[i] - '0';
+ i++;
+ j++;
+ }
+
+ while(j > 3) {
+ fl /= 10;
+ j--;
+ }
+ while(j < 3) {
+ fl *= 10;
+ j++;
+ }
+ }
+
+ while(string[i] == ' ' || string[i] == '\t')
+ i++;
+
+ if(string[i] == '\0')
+ return in * 1000 + fl;
+
+ return -1;
+}
+
+void
+do_debugf(const char *format, ...)
+{
+ va_list args;
+ va_start(args, format);
+ vfprintf(stderr, format, args);
+ fprintf(stderr, "\n");
+ fflush(stderr);
+ va_end(args);
+}
+
+int
+in_prefix(const unsigned char *restrict address,
+ const unsigned char *restrict prefix, unsigned char plen)
+{
+ unsigned char m;
+
+ if(plen > 128)
+ plen = 128;
+
+ if(memcmp(address, prefix, plen / 8) != 0)
+ return 0;
+
+ if(plen % 8 == 0)
+ return 1;
+
+ m = 0xFF << (8 - (plen % 8));
+
+ return ((address[plen / 8] & m) == (prefix[plen / 8] & m));
+}
+
+unsigned char *
+mask_prefix(unsigned char *restrict ret,
+ const unsigned char *restrict prefix, unsigned char plen)
+{
+ if(plen >= 128) {
+ memcpy(ret, prefix, 16);
+ return ret;
+ }
+
+ memset(ret, 0, 16);
+ memcpy(ret, prefix, plen / 8);
+ if(plen % 8 != 0)
+ ret[plen / 8] =
+ (prefix[plen / 8] & ((0xFF << (8 - (plen % 8))) & 0xFF));
+ return ret;
+}
+
+static const unsigned char v4prefix[16] =
+ {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
+
+static const unsigned char llprefix[16] =
+ {0xFE, 0x80};
+
+const char *
+format_address(const unsigned char *address)
+{
+ static char buf[4][INET6_ADDRSTRLEN];
+ static int i = 0;
+ i = (i + 1) % 4;
+ if(v4mapped(address))
+ inet_ntop(AF_INET, address + 12, buf[i], INET6_ADDRSTRLEN);
+ else
+ inet_ntop(AF_INET6, address, buf[i], INET6_ADDRSTRLEN);
+ return buf[i];
+}
+
+const char *
+format_prefix(const unsigned char *prefix, unsigned char plen)
+{
+ static char buf[4][INET6_ADDRSTRLEN + 4];
+ static int i = 0;
+ int n;
+ i = (i + 1) % 4;
+ if(plen >= 96 && v4mapped(prefix)) {
+ inet_ntop(AF_INET, prefix + 12, buf[i], INET6_ADDRSTRLEN);
+ n = strlen(buf[i]);
+ snprintf(buf[i] + n, INET6_ADDRSTRLEN + 4 - n, "/%d", plen - 96);
+ } else {
+ inet_ntop(AF_INET6, prefix, buf[i], INET6_ADDRSTRLEN);
+ n = strlen(buf[i]);
+ snprintf(buf[i] + n, INET6_ADDRSTRLEN + 4 - n, "/%d", plen);
+ }
+ return buf[i];
+}
+
+const char *
+format_eui64(const unsigned char *eui)
+{
+ static char buf[4][28];
+ static int i = 0;
+ i = (i + 1) % 4;
+ snprintf(buf[i], 28, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
+ eui[0], eui[1], eui[2], eui[3],
+ eui[4], eui[5], eui[6], eui[7]);
+ return buf[i];
+}
+
+int
+parse_address(const char *address, unsigned char *addr_r, int *af_r)
+{
+ struct in_addr ina;
+ struct in6_addr ina6;
+ int rc;
+
+ rc = inet_pton(AF_INET, address, &ina);
+ if(rc > 0) {
+ memcpy(addr_r, v4prefix, 12);
+ memcpy(addr_r + 12, &ina, 4);
+ if(af_r) *af_r = AF_INET;
+ return 0;
+ }
+
+ rc = inet_pton(AF_INET6, address, &ina6);
+ if(rc > 0) {
+ memcpy(addr_r, &ina6, 16);
+ if(af_r) *af_r = AF_INET6;
+ return 0;
+ }
+
+ return -1;
+}
+
+int
+parse_net(const char *net, unsigned char *prefix_r, unsigned char *plen_r,
+ int *af_r)
+{
+ char buf[INET6_ADDRSTRLEN];
+ char *slash, *end;
+ unsigned char prefix[16];
+ long plen;
+ int af;
+ struct in_addr ina;
+ struct in6_addr ina6;
+ int rc;
+
+ if(strcmp(net, "default") == 0) {
+ memset(prefix, 0, 16);
+ plen = 0;
+ } else {
+ slash = strchr(net, '/');
+ if(slash == NULL) {
+ rc = parse_address(net, prefix, &af);
+ if(rc < 0)
+ return rc;
+ plen = 128;
+ } else {
+ if(slash - net >= INET6_ADDRSTRLEN)
+ return -1;
+ memcpy(buf, net, slash - net);
+ buf[slash - net] = '\0';
+ rc = inet_pton(AF_INET, buf, &ina);
+ if(rc > 0) {
+ memcpy(prefix, v4prefix, 12);
+ memcpy(prefix + 12, &ina, 4);
+ plen = strtol(slash + 1, &end, 0);
+ if(*end != '\0' || plen < 0 || plen > 32)
+ return -1;
+ plen += 96;
+ af = AF_INET;
+ } else {
+ rc = inet_pton(AF_INET6, buf, &ina6);
+ if(rc > 0) {
+ memcpy(prefix, &ina6, 16);
+ plen = strtol(slash + 1, &end, 0);
+ if(*end != '\0' || plen < 0 || plen > 128)
+ return -1;
+ af = AF_INET6;
+ } else {
+ return -1;
+ }
+ }
+ }
+ }
+ mask_prefix(prefix_r, prefix, plen);
+ *plen_r = plen;
+ if(af_r) *af_r = af;
+ return 0;
+}
+
+int
+parse_eui64(const char *eui, unsigned char *eui_r)
+{
+ int n;
+ n = sscanf(eui, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ &eui_r[0], &eui_r[1], &eui_r[2], &eui_r[3],
+ &eui_r[4], &eui_r[5], &eui_r[6], &eui_r[7]);
+ if(n == 8)
+ return 0;
+
+ n = sscanf(eui, "%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx",
+ &eui_r[0], &eui_r[1], &eui_r[2], &eui_r[3],
+ &eui_r[4], &eui_r[5], &eui_r[6], &eui_r[7]);
+ if(n == 8)
+ return 0;
+
+ n = sscanf(eui, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ &eui_r[0], &eui_r[1], &eui_r[2],
+ &eui_r[5], &eui_r[6], &eui_r[7]);
+ if(n == 6) {
+ eui_r[3] = 0xFF;
+ eui_r[4] = 0xFE;
+ return 0;
+ }
+ return -1;
+}
+
+int
+wait_for_fd(int direction, int fd, int msecs)
+{
+ fd_set fds;
+ int rc;
+ struct timeval tv;
+
+ tv.tv_sec = msecs / 1000;
+ tv.tv_usec = (msecs % 1000) * 1000;
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ if(direction)
+ rc = select(fd + 1, NULL, &fds, NULL, &tv);
+ else
+ rc = select(fd + 1, &fds, NULL, NULL, &tv);
+
+ return rc;
+}
+
+int
+martian_prefix(const unsigned char *prefix, int plen)
+{
+ return
+ (plen >= 8 && prefix[0] == 0xFF) ||
+ (plen >= 10 && prefix[0] == 0xFE && (prefix[1] & 0xC0) == 0x80) ||
+ (plen >= 128 && memcmp(prefix, zeroes, 15) == 0 &&
+ (prefix[15] == 0 || prefix[15] == 1)) ||
+ (plen >= 96 && v4mapped(prefix) &&
+ ((plen >= 104 && (prefix[12] == 127 || prefix[12] == 0)) ||
+ (plen >= 100 && (prefix[12] & 0xE0) == 0xE0)));
+}
+
+int
+linklocal(const unsigned char *address)
+{
+ return memcmp(address, llprefix, 8) == 0;
+}
+
+int
+v4mapped(const unsigned char *address)
+{
+ return memcmp(address, v4prefix, 12) == 0;
+}
+
+void
+v4tov6(unsigned char *dst, const unsigned char *src)
+{
+ memcpy(dst, v4prefix, 12);
+ memcpy(dst + 12, src, 4);
+}
+
+void
+inaddr_to_uchar(unsigned char *dest, const struct in_addr *src)
+{
+ memcpy(dest, v4prefix, 12);
+ memcpy(dest + 12, src, 4);
+ assert(v4mapped(dest));
+}
+
+void
+uchar_to_inaddr(struct in_addr *dest, const unsigned char *src)
+{
+ assert(v4mapped(src));
+ memcpy(dest, src + 12, 4);
+}
+
+void
+in6addr_to_uchar(unsigned char *dest, const struct in6_addr *src)
+{
+ memcpy(dest, src, 16);
+}
+
+void
+uchar_to_in6addr(struct in6_addr *dest, const unsigned char *src)
+{
+ memcpy(dest, src, 16);
+}
+
+int
+daemonise()
+{
+ int rc;
+
+ fflush(stdout);
+ fflush(stderr);
+
+ rc = fork();
+ if(rc < 0)
+ return -1;
+
+ if(rc > 0)
+ exit(0);
+
+ rc = setsid();
+ if(rc < 0)
+ return -1;
+
+ return 1;
+}
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