-/* $Id$ */
-
/***
- This file is part of avahi.
-
- avahi is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- avahi 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 Lesser General
- Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with avahi; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- USA.
+ This file is part of avahi.
+
+ avahi is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ avahi 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 Lesser General
+ Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with avahi; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
-#include <stdlib.h>
-#include <unistd.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
#include <sys/socket.h>
+#include <sys/wait.h>
+#ifdef __FreeBSD__
+#include <sys/sysctl.h>
+#endif
+
+#ifdef __linux__
#include <netpacket/packet.h>
+#endif
#include <net/ethernet.h>
-#include <fcntl.h>
-#include <time.h>
+#include <net/if.h>
+#ifdef __FreeBSD__
+#include <net/if_dl.h>
+#include <net/route.h>
+#endif
+#include <arpa/inet.h>
+
#include <assert.h>
#include <errno.h>
-#include <string.h>
#include <inttypes.h>
-#include <sys/types.h>
-#include <arpa/inet.h>
-#include <sys/ioctl.h>
-#include <poll.h>
-#include <net/if.h>
+#include <fcntl.h>
+#include <stdlib.h>
#include <stdio.h>
-#include <getopt.h>
#include <signal.h>
-#include <sys/wait.h>
-#include <pwd.h>
+#include <string.h>
+#include <time.h>
+#include <getopt.h>
+
#include <grp.h>
+#include <poll.h>
+#include <pwd.h>
+#include <unistd.h>
+
+#ifndef __linux__
+#include <pcap.h>
+
+/* Old versions of PCAP defined it as D_IN */
+#ifndef PCAP_D_IN
+#define PCAP_D_IN D_IN
+#endif
+
+#endif
#include <avahi-common/malloc.h>
#include <avahi-common/timeval.h>
-
#include <avahi-daemon/setproctitle.h>
#include <libdaemon/dfork.h>
#include "main.h"
#include "iface.h"
-#ifndef __linux__
-#error "avahi-autoipd is only available on Linux for now"
-#endif
-
/* An implementation of RFC 3927 */
/* Constants from the RFC */
#define IPV4LL_BROADCAST 0xA9FEFFFFL
#define ETHER_ADDRLEN 6
+#define ETHER_HDR_SIZE (2+2*ETHER_ADDRLEN)
#define ARP_PACKET_SIZE (8+4+4+2*ETHER_ADDRLEN)
typedef enum ArpOperation {
uint8_t sender_hw_address[ETHER_ADDRLEN], target_hw_address[ETHER_ADDRLEN];
} ArpPacketInfo;
+typedef struct ArpPacket {
+ uint8_t *ether_header;
+ uint8_t *ether_payload;
+} ArpPacket;
+
static State state = STATE_START;
static int n_iteration = 0;
static int n_conflict = 0;
#endif
static int no_drop_root = 0;
static int wrote_pid_file = 0;
+static char *action_script = NULL;
static enum {
DAEMON_RUN,
#define RANDOM_DEVICE "/dev/urandom"
-#define DEBUG(x) do {\
-if (debug) { \
- x; \
-} \
-} while (0)
+#define DEBUG(x) \
+ do { \
+ if (debug) { \
+ x; \
+ } \
+ } while (0)
static void init_rand_seed(void) {
int fd;
/* Reduce to 16 bits */
while (r > 0xFFFF)
r = (r >> 16) ^ (r & 0xFFFF);
-
+
addr = htonl(IPV4LL_NETWORK | (uint32_t) r);
} while (addr == old_addr || !is_ll_address(addr));
assert(fn);
assert(addr);
-
+
if (!(f = fopen(fn, "r"))) {
if (errno == ENOENT) {
*addr = 0;
return 0;
}
-
+
daemon_log(LOG_ERR, "fopen() failed: %s", strerror(errno));
goto fail;
}
*addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
return 0;
-
+
fail:
if (f)
fclose(f);
static int save_address(const char *fn, uint32_t addr) {
FILE *f;
char buf[32];
+ mode_t u;
assert(fn);
-
+
+ u = umask(0033);
if (!(f = fopen(fn, "w"))) {
daemon_log(LOG_ERR, "fopen() failed: %s", strerror(errno));
goto fail;
}
+ umask(u);
fprintf(f, "%s\n", inet_ntop(AF_INET, &addr, buf, sizeof (buf)));
fclose(f);
return 0;
-
+
fail:
if (f)
fclose(f);
+ umask(u);
+
return -1;
}
-static void* packet_new(const ArpPacketInfo *info, size_t *packet_len) {
+/*
+ * Allocate a buffer with two pointers in front, one of which is
+ * guaranteed to point ETHER_HDR_SIZE bytes into it.
+ */
+static ArpPacket* packet_new(size_t packet_len) {
+ ArpPacket *p;
+ uint8_t *b;
+
+ assert(packet_len > 0);
+
+#ifdef __linux__
+ b = avahi_new0(uint8_t, sizeof(struct ArpPacket) + packet_len);
+ p = (ArpPacket*) b;
+ p->ether_header = NULL;
+ p->ether_payload = b + sizeof(struct ArpPacket);
+
+#else
+ b = avahi_new0(uint8_t, sizeof(struct ArpPacket) + ETHER_HDR_SIZE + packet_len);
+ p = (ArpPacket*) b;
+ p->ether_header = b + sizeof(struct ArpPacket);
+ p->ether_payload = b + sizeof(struct ArpPacket) + ETHER_HDR_SIZE;
+#endif
+
+ return p;
+}
+
+static ArpPacket* packet_new_with_info(const ArpPacketInfo *info, size_t *packet_len) {
+ ArpPacket *p = NULL;
uint8_t *r;
assert(info);
- assert(packet_len);
assert(info->operation == ARP_REQUEST || info->operation == ARP_RESPONSE);
+ assert(packet_len != NULL);
*packet_len = ARP_PACKET_SIZE;
- r = avahi_new0(uint8_t, *packet_len);
-
+ p = packet_new(*packet_len);
+ r = p->ether_payload;
+
r[1] = 1; /* HTYPE */
r[2] = 8; /* PTYPE */
r[4] = ETHER_ADDRLEN; /* HLEN */
memcpy(r+18, info->target_hw_address, ETHER_ADDRLEN);
memcpy(r+24, &info->target_ip_address, 4);
- return r;
+ return p;
}
-static void *packet_new_probe(uint32_t ip_address, const uint8_t*hw_address, size_t *packet_len) {
+static ArpPacket *packet_new_probe(uint32_t ip_address, const uint8_t*hw_address, size_t *packet_len) {
ArpPacketInfo info;
-
+
memset(&info, 0, sizeof(info));
info.operation = ARP_REQUEST;
memcpy(info.sender_hw_address, hw_address, ETHER_ADDRLEN);
info.target_ip_address = ip_address;
- return packet_new(&info, packet_len);
+ return packet_new_with_info(&info, packet_len);
}
-static void *packet_new_announcement(uint32_t ip_address, const uint8_t* hw_address, size_t *packet_len) {
+static ArpPacket *packet_new_announcement(uint32_t ip_address, const uint8_t* hw_address, size_t *packet_len) {
ArpPacketInfo info;
memset(&info, 0, sizeof(info));
info.target_ip_address = ip_address;
info.sender_ip_address = ip_address;
- return packet_new(&info, packet_len);
+ return packet_new_with_info(&info, packet_len);
}
-static int packet_parse(const void *data, size_t packet_len, ArpPacketInfo *info) {
- const uint8_t *p = data;
-
- assert(data);
+static int packet_parse(const ArpPacket *packet, size_t packet_len, ArpPacketInfo *info) {
+ const uint8_t *p;
+
+ assert(packet);
+ p = (uint8_t *)packet->ether_payload;
+ assert(p);
if (packet_len < ARP_PACKET_SIZE)
return -1;
/* Check HLEN, PLEN, OPERATION */
if (p[4] != ETHER_ADDRLEN || p[5] != 4 || p[6] != 0 || (p[7] != 1 && p[7] != 2))
return -1;
-
+
info->operation = p[7];
memcpy(info->sender_hw_address, p+8, ETHER_ADDRLEN);
memcpy(&info->sender_ip_address, p+14, 4);
[STATE_START] = "START",
[STATE_WAITING_PROBE] = "WAITING_PROBE",
[STATE_PROBING] = "PROBING",
- [STATE_WAITING_ANNOUNCE] = "WAITING_ANNOUNCE",
+ [STATE_WAITING_ANNOUNCE] = "WAITING_ANNOUNCE",
[STATE_ANNOUNCING] = "ANNOUNCING",
[STATE_RUNNING] = "RUNNING",
[STATE_SLEEPING] = "SLEEPING"
};
char buf[64];
-
+
assert(st < STATE_MAX);
if (st == state && !reset_counter) {
n_iteration = 0;
}
- if (state == STATE_SLEEPING)
+ if (state == STATE_SLEEPING)
avahi_set_proc_title(argv0, "%s: [%s] sleeping", argv0, interface_name);
else if (state == STATE_ANNOUNCING)
avahi_set_proc_title(argv0, "%s: [%s] announcing %s", argv0, interface_name, inet_ntop(AF_INET, &address, buf, sizeof(buf)));
daemon_log(LOG_ERR, "if_indextoname() failed: %s", strerror(errno));
goto fail;
}
-
+
if (ioctl(fd, SIOCGIFFLAGS, &ifreq) < 0) {
daemon_log(LOG_ERR, "SIOCGIFFLAGS failed: %s", strerror(errno));
goto fail;
close(fd);
return 0;
-
+
fail:
if (fd >= 0)
close(fd);
-
+
return -1;
}
+#ifdef __linux__
+
+/* Linux 'packet socket' specific implementation */
+
static int open_socket(int iface, uint8_t *hw_address) {
int fd = -1;
struct sockaddr_ll sa;
if (interface_up(iface) < 0)
goto fail;
-
+
if ((fd = socket(PF_PACKET, SOCK_DGRAM, 0)) < 0) {
daemon_log(LOG_ERR, "socket() failed: %s", strerror(errno));
goto fail;
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(ETH_P_ARP);
sa.sll_ifindex = iface;
-
+
if (bind(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
daemon_log(LOG_ERR, "bind() failed: %s", strerror(errno));
goto fail;
}
-
+
sa_len = sizeof(sa);
if (getsockname(fd, (struct sockaddr*) &sa, &sa_len) < 0) {
daemon_log(LOG_ERR, "getsockname() failed: %s", strerror(errno));
goto fail;
}
-
+
if (sa.sll_halen != ETHER_ADDRLEN) {
daemon_log(LOG_ERR, "getsockname() returned invalid hardware address.");
goto fail;
memcpy(hw_address, sa.sll_addr, ETHER_ADDRLEN);
return fd;
-
+
fail:
if (fd >= 0)
close(fd);
return -1;
}
-static int send_packet(int fd, int iface, void *packet, size_t packet_len) {
+static int send_packet(int fd, int iface, ArpPacket *packet, size_t packet_len) {
struct sockaddr_ll sa;
-
+
assert(fd >= 0);
assert(packet);
assert(packet_len > 0);
sa.sll_halen = ETHER_ADDRLEN;
memset(sa.sll_addr, 0xFF, ETHER_ADDRLEN);
- if (sendto(fd, packet, packet_len, 0, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
+ if (sendto(fd, packet->ether_payload, packet_len, 0, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
daemon_log(LOG_ERR, "sendto() failed: %s", strerror(errno));
return -1;
}
return 0;
}
-static int recv_packet(int fd, void **packet, size_t *packet_len) {
+static int recv_packet(int fd, ArpPacket **packet, size_t *packet_len) {
int s;
struct sockaddr_ll sa;
socklen_t sa_len;
ssize_t r;
-
+
assert(fd >= 0);
assert(packet);
assert(packet_len);
if (s <= 0)
s = 4096;
- *packet = avahi_new(uint8_t, s);
+ *packet = packet_new(s);
sa_len = sizeof(sa);
- if ((r = recvfrom(fd, *packet, s, 0, (struct sockaddr*) &sa, &sa_len)) < 0) {
+ if ((r = recvfrom(fd, (*packet)->ether_payload, s, 0, (struct sockaddr*) &sa, &sa_len)) < 0) {
daemon_log(LOG_ERR, "recvfrom() failed: %s", strerror(errno));
goto fail;
}
-
+
*packet_len = (size_t) r;
-
+
return 0;
-
+
fail:
if (*packet) {
avahi_free(*packet);
return -1;
}
-
+
+static void close_socket(int fd) {
+ close(fd);
+}
+
+#else /* !__linux__ */
+/* PCAP-based implementation */
+
+static pcap_t *__pp;
+static char __pcap_errbuf[PCAP_ERRBUF_SIZE];
+static uint8_t __lladdr[ETHER_ADDRLEN];
+
+#ifndef elementsof
+#define elementsof(array) (sizeof(array)/sizeof(array[0]))
+#endif
+
+static int __get_ether_addr(int ifindex, u_char *lladdr) {
+ int mib[6];
+ char *buf;
+ struct if_msghdr *ifm;
+ char *lim;
+ char *next;
+ struct sockaddr_dl *sdl;
+ size_t len;
+
+ mib[0] = CTL_NET;
+ mib[1] = PF_ROUTE;
+ mib[2] = 0;
+ mib[3] = 0;
+ mib[4] = NET_RT_IFLIST;
+ mib[5] = ifindex;
+
+ if (sysctl(mib, elementsof(mib), NULL, &len, NULL, 0) != 0) {
+ daemon_log(LOG_ERR, "sysctl(NET_RT_IFLIST): %s",
+ strerror(errno));
+ return -1;
+ }
+
+ buf = avahi_malloc(len);
+ if (sysctl(mib, elementsof(mib), buf, &len, NULL, 0) != 0) {
+ daemon_log(LOG_ERR, "sysctl(NET_RT_IFLIST): %s",
+ strerror(errno));
+ free(buf);
+ return -1;
+ }
+
+ lim = buf + len;
+ for (next = buf; next < lim; next += ifm->ifm_msglen) {
+ ifm = (struct if_msghdr *)next;
+ if (ifm->ifm_type == RTM_IFINFO) {
+ sdl = (struct sockaddr_dl *)(ifm + 1);
+ memcpy(lladdr, LLADDR(sdl), ETHER_ADDRLEN);
+ }
+ }
+ avahi_free(buf);
+
+ return 0;
+}
+
+#define PCAP_TIMEOUT 500 /* 0.5s */
+
+static int open_socket(int iface, uint8_t *hw_address) {
+ struct bpf_program bpf;
+ char *filter;
+ char ifname[IFNAMSIZ];
+ pcap_t *pp;
+ int err;
+ int fd;
+
+ assert(__pp == NULL);
+
+ if (interface_up(iface) < 0)
+ return -1;
+
+ if (__get_ether_addr(iface, __lladdr) == -1)
+ return -1;
+
+ if (if_indextoname(iface, ifname) == NULL)
+ return -1;
+
+ /*
+ * Using a timeout for BPF is fairly portable across BSDs. On most
+ * modern versions, using the timeout/nonblock/poll method results in
+ * fairly sane behavior, with the timeout only coming into play during
+ * the next_ex() call itself (so, for us, that's only when there's
+ * data). On older versions, it may result in a PCAP_TIMEOUT busy-wait
+ * on some versions, though, as the poll() may terminate at the
+ * PCAP_TIMEOUT instead of the poll() timeout.
+ */
+ pp = pcap_open_live(ifname, 1500, 0, PCAP_TIMEOUT, __pcap_errbuf);
+ if (pp == NULL) {
+ return (-1);
+ }
+ err = pcap_set_datalink(pp, DLT_EN10MB);
+ if (err == -1) {
+ daemon_log(LOG_ERR, "pcap_set_datalink: %s", pcap_geterr(pp));
+ pcap_close(pp);
+ return (-1);
+ }
+ err = pcap_setdirection(pp, PCAP_D_IN);
+ if (err == -1) {
+ daemon_log(LOG_ERR, "pcap_setdirection: %s", pcap_geterr(pp));
+ pcap_close(pp);
+ return (-1);
+ }
+
+ fd = pcap_get_selectable_fd(pp);
+ if (fd == -1) {
+ pcap_close(pp);
+ return (-1);
+ }
+
+ /*
+ * Using setnonblock is a portability stop-gap. Using the timeout in
+ * combination with setnonblock will ensure on most BSDs that the
+ * next_ex call returns in a timely fashion.
+ */
+ err = pcap_setnonblock(pp, 1, __pcap_errbuf);
+ if (err == -1) {
+ pcap_close(pp);
+ return (-1);
+ }
+
+ filter = avahi_strdup_printf("arp and (ether dst ff:ff:ff:ff:ff:ff or "
+ "%02x:%02x:%02x:%02x:%02x:%02x)",
+ __lladdr[0], __lladdr[1],
+ __lladdr[2], __lladdr[3],
+ __lladdr[4], __lladdr[5]);
+ DEBUG(daemon_log(LOG_DEBUG, "Using pcap filter '%s'", filter));
+
+ err = pcap_compile(pp, &bpf, filter, 1, 0);
+ avahi_free(filter);
+ if (err == -1) {
+ daemon_log(LOG_ERR, "pcap_compile: %s", pcap_geterr(pp));
+ pcap_close(pp);
+ return (-1);
+ }
+ err = pcap_setfilter(pp, &bpf);
+ if (err == -1) {
+ daemon_log(LOG_ERR, "pcap_setfilter: %s", pcap_geterr(pp));
+ pcap_close(pp);
+ return (-1);
+ }
+ pcap_freecode(&bpf);
+
+ /* Stash pcap-specific context away. */
+ memcpy(hw_address, __lladdr, ETHER_ADDRLEN);
+ __pp = pp;
+
+ return (fd);
+}
+
+static void close_socket(int fd AVAHI_GCC_UNUSED) {
+ assert(__pp != NULL);
+ pcap_close(__pp);
+ __pp = NULL;
+}
+
+/*
+ * We trick avahi into allocating sizeof(packet) + sizeof(ether_header),
+ * and prepend the required ethernet header information before sending.
+ */
+static int send_packet(int fd AVAHI_GCC_UNUSED, int iface AVAHI_GCC_UNUSED, ArpPacket *packet, size_t packet_len) {
+ struct ether_header *eh;
+
+ assert(__pp != NULL);
+ assert(packet != NULL);
+
+ eh = (struct ether_header *)packet->ether_header;
+ memset(eh->ether_dhost, 0xFF, ETHER_ADDRLEN);
+ memcpy(eh->ether_shost, __lladdr, ETHER_ADDRLEN);
+ eh->ether_type = htons(0x0806);
+
+ return (pcap_inject(__pp, (void *)eh, packet_len + sizeof(*eh)));
+}
+
+static int recv_packet(int fd AVAHI_GCC_UNUSED, ArpPacket **packet, size_t *packet_len) {
+ struct pcap_pkthdr *ph;
+ u_char *pd;
+ ArpPacket *ap;
+ int err;
+ int retval;
+
+ assert(__pp != NULL);
+ assert(packet != NULL);
+ assert(packet_len != NULL);
+
+ *packet = NULL;
+ *packet_len = 0;
+ retval = -1;
+
+ err = pcap_next_ex(__pp, &ph, (const u_char **)&pd);
+ if (err == 1 && ph->caplen <= ph->len) {
+ ap = packet_new(ph->caplen);
+ memcpy(ap->ether_header, pd, ph->caplen);
+ *packet = ap;
+ *packet_len = (ph->caplen - sizeof(struct ether_header));
+ retval = 0;
+ } else if (err >= 0) {
+ /*
+ * err == 1: Just drop bogus packets (>1500 for an arp packet!?)
+ * on the floor.
+ *
+ * err == 0: We might have had traffic on the pcap fd that
+ * didn't match the filter, in which case we'll get 0 packets.
+ */
+ retval = 0;
+ } else
+ daemon_log(LOG_ERR, "pcap_next_ex(%d): %s",
+ err, pcap_geterr(__pp));
+
+ return (retval);
+}
+#endif /* __linux__ */
+
int is_ll_address(uint32_t addr) {
return
- (ntohl(addr) & IPV4LL_NETMASK) == IPV4LL_NETWORK &&
- ntohl(addr) != IPV4LL_NETWORK &&
- ntohl(addr) != IPV4LL_BROADCAST;
+ ((ntohl(addr) & IPV4LL_NETMASK) == IPV4LL_NETWORK) &&
+ ((ntohl(addr) & 0x0000FF00) != 0x0000) &&
+ ((ntohl(addr) & 0x0000FF00) != 0xFF00);
}
static struct timeval *elapse_time(struct timeval *tv, unsigned msec, unsigned jitter) {
if (jitter)
avahi_timeval_add(tv, (AvahiUsec) (jitter*1000.0*rand()/(RAND_MAX+1.0)));
-
+
return tv;
}
if ((pid = fork()) < 0)
goto fail;
else if (pid == 0) {
- FILE *f = NULL;
+ FILE *f = NULL;
int r = 1;
/* Please note that the signal pipe is not closed at this
* process. */
daemon_retval_done();
-
- setsid();
avahi_set_proc_title(argv0, "%s: [%s] callout dispatcher", argv0, interface_name);
daemon_log(LOG_ERR, "fdopen() failed: %s", strerror(errno));
goto dispatcher_fail;
}
-
+
for (;;) {
CalloutEventInfo info;
char name[IFNAMSIZ], buf[64];
daemon_log(LOG_ERR, "if_indextoname() failed: %s", strerror(errno));
continue;
}
-
+
if (daemon_exec("/", &k,
- AVAHI_IPCONF_SCRIPT, AVAHI_IPCONF_SCRIPT,
+ action_script, action_script,
callout_event_table[info.event],
name,
inet_ntop(AF_INET, &info.address, buf, sizeof(buf)), NULL) < 0) {
-
+
daemon_log(LOG_ERR, "Failed to run script: %s", strerror(errno));
continue;
}
#ifdef HAVE_CHROOT
/* If the main process is trapped inside a chroot() we have to
* remove the PID file for it */
-
+
if (!no_chroot && wrote_pid_file)
daemon_pid_file_remove();
#endif
-
+
_exit(r);
}
daemon_log(LOG_ERR, "fdopen() failed: %s", strerror(errno));
goto fail;
}
-
+
return ret;
fail:
daemon_log(LOG_ERR, "Failed to write callout event: %s", strerror(errno));
return -1;
}
-
+
return 0;
}
int r;
mode_t u;
+ pw = NULL;
+ gr = NULL;
+
/* Get user/group ID */
-
+
if (!no_drop_root) {
-
+
if (!(pw = getpwnam(AVAHI_AUTOIPD_USER))) {
daemon_log(LOG_ERR, "Failed to find user '"AVAHI_AUTOIPD_USER"'.");
return -1;
}
-
+
if (!(gr = getgrnam(AVAHI_AUTOIPD_GROUP))) {
daemon_log(LOG_ERR, "Failed to find group '"AVAHI_AUTOIPD_GROUP"'.");
return -1;
}
-
+
daemon_log(LOG_INFO, "Found user '"AVAHI_AUTOIPD_USER"' (UID %lu) and group '"AVAHI_AUTOIPD_GROUP"' (GID %lu).", (unsigned long) pw->pw_uid, (unsigned long) gr->gr_gid);
}
u = umask(0000);
r = mkdir(AVAHI_IPDATA_DIR, 0755);
umask(u);
-
+
if (r < 0 && errno != EEXIST) {
daemon_log(LOG_ERR, "mkdir(\""AVAHI_IPDATA_DIR"\"): %s", strerror(errno));
return -1;
}
/* Convey working directory */
-
+
if (!no_drop_root) {
struct stat st;
-
+
chown(AVAHI_IPDATA_DIR, pw->pw_uid, gr->gr_gid);
-
+
if (stat(AVAHI_IPDATA_DIR, &st) < 0) {
daemon_log(LOG_ERR, "stat(): %s\n", strerror(errno));
return -1;
}
-
+
if (!S_ISDIR(st.st_mode) || st.st_uid != pw->pw_uid || st.st_gid != gr->gr_gid) {
daemon_log(LOG_ERR, "Failed to create runtime directory "AVAHI_IPDATA_DIR".");
return -1;
* the pid file anymore, the helper process will do that for us. */
wrote_pid_file = 0;
}
-
+
#endif
if (!no_drop_root) {
daemon_log(LOG_ERR, "Failed to change group list: %s", strerror(errno));
return -1;
}
-
+
#if defined(HAVE_SETRESGID)
r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
#elif defined(HAVE_SETEGID)
#elif defined(HAVE_SETREGID)
r = setregid(gr->gr_gid, gr->gr_gid);
#else
-#error "No API to drop priviliges"
+#error "No API to drop privileges"
#endif
if (r < 0) {
daemon_log(LOG_ERR, "Failed to change GID: %s", strerror(errno));
return -1;
}
-
+
#if defined(HAVE_SETRESUID)
r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
#elif defined(HAVE_SETEUID)
#elif defined(HAVE_SETREUID)
r = setreuid(pw->pw_uid, pw->pw_uid);
#else
-#error "No API to drop priviliges"
+#error "No API to drop privileges"
#endif
-
+
if (r < 0) {
daemon_log(LOG_ERR, "Failed to change UID: %s", strerror(errno));
return -1;
set_env("USER", pw->pw_name);
set_env("LOGNAME", pw->pw_name);
set_env("HOME", pw->pw_dir);
-
- daemon_log(LOG_ERR, "Successfully dropped root privileges.");
+
+ daemon_log(LOG_INFO, "Successfully dropped root privileges.");
}
-
+
return 0;
}
FD_ARP,
FD_IFACE,
FD_SIGNAL,
- FD_MAX,
+ FD_MAX
};
int fd = -1, ret = -1;
struct timeval next_wakeup;
int next_wakeup_valid = 0;
char buf[64];
- void *in_packet = NULL;
- size_t in_packet_len;
- void *out_packet = NULL;
+ ArpPacket *in_packet = NULL;
+ size_t in_packet_len = 0;
+ ArpPacket *out_packet = NULL;
size_t out_packet_len;
uint8_t hw_address[ETHER_ADDRLEN];
struct pollfd pollfds[FD_MAX];
- int iface_fd;
+ int iface_fd = -1;
Event event = EVENT_NULL;
int retval_sent = !daemonize;
State st;
char *address_fn = NULL;
const char *p;
- daemon_signal_init(SIGINT, SIGTERM, SIGCHLD, SIGHUP,0);
+ daemon_signal_init(SIGINT, SIGTERM, SIGCHLD, SIGHUP, 0);
if (!(dispatcher = fork_dispatcher()))
goto fail;
else
#endif
p = AVAHI_IPDATA_DIR;
-
+
address_fn = avahi_strdup_printf(
"%s/%02x:%02x:%02x:%02x:%02x:%02x", p,
hw_address[0], hw_address[1],
hw_address[2], hw_address[3],
hw_address[4], hw_address[5]);
-
+
if (!addr)
load_address(address_fn, &addr);
if (addr && !is_ll_address(addr)) {
- daemon_log(LOG_WARNING, "Requested address %s is not from IPv4LL range 169.254/16, ignoring.", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
+ daemon_log(LOG_WARNING, "Requested address %s is not from IPv4LL range 169.254/16 or a reserved address, ignoring.", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
addr = 0;
}
for (i = 0; i < ETHER_ADDRLEN; i++)
a += hw_address[i]*i;
+ a = (a % 0xFE00) + 0x0100;
+
addr = htonl(IPV4LL_NETWORK | (uint32_t) a);
}
+ assert(is_ll_address(addr));
+
set_state(st, 1, addr);
-
+
daemon_log(LOG_INFO, "Starting with address %s", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
if (state == STATE_SLEEPING)
pollfds[FD_IFACE].events = POLLIN;
pollfds[FD_SIGNAL].fd = daemon_signal_fd();
pollfds[FD_SIGNAL].events = POLLIN;
-
+
for (;;) {
int r, timeout;
AvahiUsec usec;
elapse_time(&next_wakeup, PROBE_MIN*1000, (PROBE_MAX-PROBE_MIN)*1000);
next_wakeup_valid = 1;
-
+
} else if (state == STATE_PROBING && event == EVENT_TIMEOUT && n_iteration >= PROBE_NUM-2) {
/* Send the last probe */
elapse_time(&next_wakeup, ANNOUNCE_WAIT*1000, 0);
next_wakeup_valid = 1;
-
+
} else if ((state == STATE_WAITING_ANNOUNCE && event == EVENT_TIMEOUT) ||
(state == STATE_ANNOUNCING && event == EVENT_TIMEOUT && n_iteration < ANNOUNCE_NUM-1)) {
elapse_time(&next_wakeup, ANNOUNCE_INTERVAL*1000, 0);
next_wakeup_valid = 1;
-
+
if (n_iteration == 0) {
if (do_callout(dispatcher, CALLOUT_BIND, iface, addr) < 0)
goto fail;
-
+
n_conflict = 0;
}
next_wakeup_valid = 0;
save_address(address_fn, addr);
-
+
if (!retval_sent) {
daemon_retval_send(0);
retval_sent = 1;
ArpPacketInfo info;
assert(in_packet);
-
+
if (packet_parse(in_packet, in_packet_len, &info) < 0)
daemon_log(LOG_WARNING, "Failed to parse incoming ARP packet.");
else {
int conflict = 0;
if (info.sender_ip_address == addr) {
- /* Normal conflict */
- conflict = 1;
- daemon_log(LOG_INFO, "Recieved conflicting normal ARP packet.");
+
+ if (memcmp(hw_address, info.sender_hw_address, ETHER_ADDRLEN)) {
+ /* Normal conflict */
+ conflict = 1;
+ daemon_log(LOG_INFO, "Received conflicting normal ARP packet.");
+ } else
+ daemon_log(LOG_DEBUG, "Received ARP packet back on source interface. Ignoring.");
+
} else if (state == STATE_WAITING_PROBE || state == STATE_PROBING || state == STATE_WAITING_ANNOUNCE) {
/* Probe conflict */
conflict = info.target_ip_address == addr && memcmp(hw_address, info.sender_hw_address, ETHER_ADDRLEN);
if (conflict)
- daemon_log(LOG_INFO, "Recieved conflicting probe ARP packet.");
+ daemon_log(LOG_INFO, "Received conflicting probe ARP packet.");
}
if (conflict) {
-
+
if (state == STATE_RUNNING || state == STATE_ANNOUNCING)
if (do_callout(dispatcher, CALLOUT_CONFLICT, iface, addr) < 0)
goto fail;
-
+
/* Pick a new address */
addr = pick_addr(addr);
n_conflict++;
set_state(STATE_WAITING_PROBE, 1, addr);
-
+
if (n_conflict >= MAX_CONFLICTS) {
daemon_log(LOG_WARNING, "Got too many conflicts, rate limiting new probes.");
elapse_time(&next_wakeup, RATE_LIMIT_INTERVAL*1000, PROBE_WAIT*1000);
} else
DEBUG(daemon_log(LOG_DEBUG, "Ignoring irrelevant ARP packet."));
}
-
- } else if (event == EVENT_ROUTABLE_ADDR_CONFIGURED) {
+
+ } else if (event == EVENT_ROUTABLE_ADDR_CONFIGURED && !force_bind) {
daemon_log(LOG_INFO, "A routable address has been configured.");
daemon_retval_send(0);
retval_sent = 1;
}
-
+
set_state(STATE_SLEEPING, 1, addr);
next_wakeup_valid = 0;
-
+
} else if (event == EVENT_ROUTABLE_ADDR_UNCONFIGURED && state == STATE_SLEEPING && !force_bind) {
daemon_log(LOG_INFO, "No longer a routable address configured, restarting probe process.");
elapse_time(&next_wakeup, 0, PROBE_WAIT*1000);
next_wakeup_valid = 1;
- } else if (event == EVENT_REFRESH_REQUEST && state == STATE_RUNNING && !force_bind) {
+ } else if (event == EVENT_REFRESH_REQUEST && state == STATE_RUNNING) {
/* The user requested a reannouncing of the address by a SIGHUP */
daemon_log(LOG_INFO, "Reannouncing address.");
-
+
/* Send announcement packet */
out_packet = packet_new_announcement(addr, hw_address, &out_packet_len);
set_state(STATE_ANNOUNCING, 1, addr);
elapse_time(&next_wakeup, ANNOUNCE_INTERVAL*1000, 0);
next_wakeup_valid = 1;
}
-
+
if (out_packet) {
DEBUG(daemon_log(LOG_DEBUG, "sending..."));
-
+
if (send_packet(fd, iface, out_packet, out_packet_len) < 0)
goto fail;
-
+
avahi_free(out_packet);
out_packet = NULL;
}
event = EVENT_NULL;
timeout = -1;
-
+
if (next_wakeup_valid) {
usec = avahi_age(&next_wakeup);
timeout = usec < 0 ? (int) (-usec/1000) : 0;
}
DEBUG(daemon_log(LOG_DEBUG, "sleeping %ims", timeout));
-
+
while ((r = poll(pollfds, FD_MAX, timeout)) < 0 && errno == EINTR)
;
event = EVENT_TIMEOUT;
next_wakeup_valid = 0;
} else {
-
-
+
+
if (pollfds[FD_ARP].revents) {
if (pollfds[FD_ARP].revents == POLLERR) {
/* The interface is probably down, let's recreate our socket */
-
- close(fd);
+
+ close_socket(fd);
if ((fd = open_socket(iface, hw_address)) < 0)
goto fail;
pollfds[FD_ARP].fd = fd;
-
+
} else {
-
+
assert(pollfds[FD_ARP].revents == POLLIN);
-
+
if (recv_packet(fd, &in_packet, &in_packet_len) < 0)
goto fail;
-
+
if (in_packet)
event = EVENT_PACKET;
}
if (event == EVENT_NULL &&
pollfds[FD_IFACE].revents) {
-
+
assert(pollfds[FD_IFACE].revents == POLLIN);
if (iface_process(&event) < 0)
case SIGCHLD:
waitpid(-1, NULL, WNOHANG);
break;
-
+
case SIGHUP:
event = EVENT_REFRESH_REQUEST;
break;
}
-
+
}
}
}
ret = 0;
-
+
fail:
if (state == STATE_RUNNING || state == STATE_ANNOUNCING)
avahi_free(out_packet);
avahi_free(in_packet);
-
+
if (fd >= 0)
- close(fd);
+ close_socket(fd);
if (iface_fd >= 0)
iface_done();
if (address_fn)
avahi_free(address_fn);
-
+
return ret;
}
" -D --daemonize Daemonize after startup\n"
" -s --syslog Write log messages to syslog(3) instead of STDERR\n"
" -k --kill Kill a running daemon\n"
- " -r --refresh Request a running daemon to refresh it's IP address\n"
+ " -r --refresh Request a running daemon refresh its IP address\n"
" -c --check Return 0 if a daemon is already running\n"
" -V --version Show version\n"
" -S --start=ADDRESS Start with this address from the IPv4LL range\n"
" 169.254.0.0/16\n"
+ " -t --script=script Action script to run (defaults to\n"
+ " "AVAHI_IPCONF_SCRIPT")\n"
" -w --wait Wait until an address has been acquired before\n"
" daemonizing\n"
" --force-bind Assign an IPv4LL address even if a routable address\n"
" is already assigned\n"
" --no-drop-root Don't drop privileges\n"
-#ifdef HAVE_CHROOT
+#ifdef HAVE_CHROOT
" --no-chroot Don't chroot()\n"
-#endif
+#endif
" --no-proc-title Don't modify process title\n"
" --debug Increase verbosity\n",
a0);
static int parse_command_line(int argc, char *argv[]) {
int c;
-
+
enum {
OPTION_NO_PROC_TITLE = 256,
OPTION_FORCE_BIND,
OPTION_NO_DROP_ROOT,
#ifdef HAVE_CHROOT
OPTION_NO_CHROOT
-#endif
+#endif
};
-
+
static const struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "daemonize", no_argument, NULL, 'D' },
{ "check", no_argument, NULL, 'c' },
{ "version", no_argument, NULL, 'V' },
{ "start", required_argument, NULL, 'S' },
+ { "script", required_argument, NULL, 't' },
{ "wait", no_argument, NULL, 'w' },
{ "force-bind", no_argument, NULL, OPTION_FORCE_BIND },
{ "no-drop-root", no_argument, NULL, OPTION_NO_DROP_ROOT },
-#ifdef HAVE_CHROOT
+#ifdef HAVE_CHROOT
{ "no-chroot", no_argument, NULL, OPTION_NO_CHROOT },
-#endif
+#endif
{ "no-proc-title", no_argument, NULL, OPTION_NO_PROC_TITLE },
{ "debug", no_argument, NULL, OPTION_DEBUG },
{ NULL, 0, NULL, 0 }
};
- opterr = 0;
- while ((c = getopt_long(argc, argv, "hDskrcVS:w", long_options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "hDskrcVS:t:w", long_options, NULL)) >= 0) {
switch(c) {
case 's':
command = DAEMON_CHECK;
break;
case 'S':
-
+
if ((start_address = inet_addr(optarg)) == (uint32_t) -1) {
fprintf(stderr, "Failed to parse IP address '%s'.", optarg);
return -1;
}
break;
+ case 't':
+ avahi_free(action_script);
+ action_script = avahi_strdup(optarg);
+ break;
case 'w':
wait_for_address = 1;
break;
-
+
case OPTION_NO_PROC_TITLE:
modify_proc_title = 0;
break;
#endif
default:
- fprintf(stderr, "Invalid command line argument: %s\n", argv[optind-1]);
return -1;
}
}
fprintf(stderr, "Too many arguments\n");
return -1;
}
-
+
+ if (!action_script)
+ action_script = avahi_strdup(AVAHI_IPCONF_SCRIPT);
+
return 0;
}
char *log_ident = NULL;
signal(SIGPIPE, SIG_IGN);
-
+
if ((argv0 = strrchr(argv[0], '/')))
argv0 = avahi_strdup(argv0 + 1);
else
argv0 = avahi_strdup(argv[0]);
daemon_log_ident = argv0;
-
+
if (parse_command_line(argc, argv) < 0)
goto finish;
int ifindex;
init_rand_seed();
-
+
if ((ifindex = if_nametoindex(interface_name)) <= 0) {
daemon_log(LOG_ERR, "Failed to get index for interface name '%s': %s", interface_name, strerror(errno));
goto finish;
if (daemonize) {
daemon_retval_init();
-
+
if ((pid = daemon_fork()) < 0)
goto finish;
else if (pid != 0) {
wrote_pid_file = 1;
avahi_set_proc_title(argv0, "%s: [%s] starting up", argv0, interface_name);
-
+
if (loop(ifindex, start_address) < 0)
goto finish;
r = 0;
} else if (command == DAEMON_HELP) {
help(stdout, argv0);
-
+
r = 0;
} else if (command == DAEMON_VERSION) {
printf("%s "PACKAGE_VERSION"\n", argv0);
-
+
r = 0;
} else if (command == DAEMON_KILL) {
if (daemon_pid_file_kill_wait(SIGTERM, 5) < 0) {
daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno));
goto finish;
}
-
+
r = 0;
} else if (command == DAEMON_REFRESH) {
if (daemon_pid_file_kill(SIGHUP) < 0) {
if (daemonize)
daemon_retval_done();
-
+
if (wrote_pid_file)
daemon_pid_file_remove();
avahi_free(pid_file_name);
avahi_free(argv0);
avahi_free(interface_name);
+ avahi_free(action_script);
return r;
}
projects / catta / blobdiff