-/* $Id$ */
-
/***
- 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 <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+#include <time.h>
+#include <getopt.h>
+
+#include <grp.h>
#include <poll.h>
-#include <net/if.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_NETWORK 0xA9FE0000L
#define IPV4LL_NETMASK 0xFFFF0000L
#define IPV4LL_HOSTMASK 0x0000FFFFL
+#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;
+static char *interface_name = NULL;
+static char *pid_file_name = NULL;
+static uint32_t start_address = 0;
+static char *argv0 = NULL;
+static int daemonize = 0;
+static int wait_for_address = 0;
+static int use_syslog = 0;
+static int debug = 0;
+static int modify_proc_title = 1;
+static int force_bind = 0;
+#ifdef HAVE_CHROOT
+static int no_chroot = 0;
+#endif
+static int no_drop_root = 0;
+static int wrote_pid_file = 0;
+static char *action_script = NULL;
+
+static enum {
+ DAEMON_RUN,
+ DAEMON_KILL,
+ DAEMON_REFRESH,
+ DAEMON_VERSION,
+ DAEMON_HELP,
+ DAEMON_CHECK
+} command = DAEMON_RUN;
+
+typedef enum CalloutEvent {
+ CALLOUT_BIND,
+ CALLOUT_CONFLICT,
+ CALLOUT_UNBIND,
+ CALLOUT_STOP,
+ CALLOUT_MAX
+} CalloutEvent;
+
+static const char * const callout_event_table[CALLOUT_MAX] = {
+ [CALLOUT_BIND] = "BIND",
+ [CALLOUT_CONFLICT] = "CONFLICT",
+ [CALLOUT_UNBIND] = "UNBIND",
+ [CALLOUT_STOP] = "STOP"
+};
+
+typedef struct CalloutEventInfo {
+ CalloutEvent event;
+ uint32_t address;
+ int ifindex;
+} CalloutEventInfo;
+
#define RANDOM_DEVICE "/dev/urandom"
+#define DEBUG(x) \
+ do { \
+ if (debug) { \
+ x; \
+ } \
+ } while (0)
+
static void init_rand_seed(void) {
int fd;
unsigned seed = 0;
/* Reduce to 16 bits */
while (r > 0xFFFF)
r = (r >> 16) ^ (r & 0xFFFF);
-
+
addr = htonl(IPV4LL_NETWORK | (uint32_t) r);
- } while (addr == old_addr);
+ } while (addr == old_addr || !is_ll_address(addr));
return addr;
}
-static void* packet_new(const ArpPacketInfo *info, size_t *packet_len) {
+static int load_address(const char *fn, uint32_t *addr) {
+ FILE *f;
+ unsigned a, b, c, d;
+
+ 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;
+ }
+
+ if (fscanf(f, "%u.%u.%u.%u\n", &a, &b, &c, &d) != 4) {
+ daemon_log(LOG_ERR, "Parse failure");
+ goto fail;
+ }
+
+ fclose(f);
+
+ *addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
+ return 0;
+
+fail:
+ if (f)
+ fclose(f);
+
+ return -1;
+}
+
+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;
+}
+
+/*
+ * 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);
return 0;
}
-static void set_state(State st, int reset_counter) {
- const char* const state_table[] = {
+static void set_state(State st, int reset_counter, uint32_t address) {
+ static const char* const state_table[] = {
[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++;
- daemon_log(LOG_DEBUG, "State iteration %s-%i", state_table[state], n_iteration);
+ DEBUG(daemon_log(LOG_DEBUG, "State iteration %s-%i", state_table[state], n_iteration));
} else {
- daemon_log(LOG_DEBUG, "State transition %s-%i -> %s-0", state_table[state], n_iteration, state_table[st]);
+ DEBUG(daemon_log(LOG_DEBUG, "State transition %s-%i -> %s-0", state_table[state], n_iteration, state_table[st]));
state = st;
n_iteration = 0;
}
+
+ 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)));
+ else if (state == STATE_RUNNING)
+ avahi_set_proc_title(argv0, "%s: [%s] bound %s", argv0, interface_name, inet_ntop(AF_INET, &address, buf, sizeof(buf)));
+ else
+ avahi_set_proc_title(argv0, "%s: [%s] probing %s", argv0, interface_name, inet_ntop(AF_INET, &address, buf, sizeof(buf)));
}
-static int add_address(int iface, uint32_t addr) {
- char buf[64];
+static int interface_up(int iface) {
+ int fd = -1;
+ struct ifreq ifreq;
- daemon_log(LOG_INFO, "Selected address %s", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
- return 0;
-}
+ if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
+ daemon_log(LOG_ERR, "socket() failed: %s", strerror(errno));
+ goto fail;
+ }
+
+ memset(&ifreq, 0, sizeof(ifreq));
+ if (!if_indextoname(iface, ifreq.ifr_name)) {
+ 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;
+ }
+
+ ifreq.ifr_flags |= IFF_UP;
+
+ if (ioctl(fd, SIOCSIFFLAGS, &ifreq) < 0) {
+ daemon_log(LOG_ERR, "SIOCSIFFLAGS failed: %s", strerror(errno));
+ goto fail;
+ }
+
+ close(fd);
-static int remove_address(int iface, uint32_t addr) {
- char buf[64];
-
- daemon_log(LOG_INFO, "Removing address %s", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
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;
socklen_t sa_len;
-
+
+ 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;
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);
goto fail;
}
- assert(s > 0);
+ if (s <= 0)
+ s = 4096;
- *packet_len = (size_t) s;
- *packet = avahi_new(uint8_t, s);
+ *packet = packet_new(s);
sa_len = sizeof(sa);
- if (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)
+ if (*packet) {
avahi_free(*packet);
+ *packet = NULL;
+ }
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;
+ return
+ ((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;
}
+static FILE* fork_dispatcher(void) {
+ FILE *ret;
+ int fds[2];
+ pid_t pid;
+
+ if (pipe(fds) < 0) {
+ daemon_log(LOG_ERR, "pipe() failed: %s", strerror(errno));
+ goto fail;
+ }
+
+ if ((pid = fork()) < 0)
+ goto fail;
+ else if (pid == 0) {
+ FILE *f = NULL;
+ int r = 1;
+
+ /* Please note that the signal pipe is not closed at this
+ * point, signals will thus be dispatched in the main
+ * process. */
+
+ daemon_retval_done();
+
+ avahi_set_proc_title(argv0, "%s: [%s] callout dispatcher", argv0, interface_name);
+
+ close(fds[1]);
+
+ if (!(f = fdopen(fds[0], "r"))) {
+ daemon_log(LOG_ERR, "fdopen() failed: %s", strerror(errno));
+ goto dispatcher_fail;
+ }
+
+ for (;;) {
+ CalloutEventInfo info;
+ char name[IFNAMSIZ], buf[64];
+ int k;
+
+ if (fread(&info, sizeof(info), 1, f) != 1) {
+ if (feof(f))
+ break;
+
+ daemon_log(LOG_ERR, "fread() failed: %s", strerror(errno));
+ goto dispatcher_fail;
+ }
+
+ assert(info.event <= CALLOUT_MAX);
+
+ if (!if_indextoname(info.ifindex, name)) {
+ daemon_log(LOG_ERR, "if_indextoname() failed: %s", strerror(errno));
+ continue;
+ }
+
+ if (daemon_exec("/", &k,
+ 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;
+ }
+
+ if (k != 0)
+ daemon_log(LOG_WARNING, "Script execution failed with return value %i", k);
+ }
+
+ r = 0;
+
+ dispatcher_fail:
+
+ if (f)
+ fclose(f);
+
+#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);
+ }
+
+ /* parent */
+
+ close(fds[0]);
+ fds[0] = -1;
+
+ if (!(ret = fdopen(fds[1], "w"))) {
+ daemon_log(LOG_ERR, "fdopen() failed: %s", strerror(errno));
+ goto fail;
+ }
+
+ return ret;
+
+fail:
+ if (fds[0] >= 0)
+ close(fds[0]);
+ if (fds[1] >= 0)
+ close(fds[1]);
+
+ return NULL;
+}
+
+static int do_callout(FILE *f, CalloutEvent event, int iface, uint32_t addr) {
+ CalloutEventInfo info;
+ char buf[64], ifname[IFNAMSIZ];
+
+ daemon_log(LOG_INFO, "Callout %s, address %s on interface %s",
+ callout_event_table[event],
+ inet_ntop(AF_INET, &addr, buf, sizeof(buf)),
+ if_indextoname(iface, ifname));
+
+ info.event = event;
+ info.ifindex = iface;
+ info.address = addr;
+
+ if (fwrite(&info, sizeof(info), 1, f) != 1 || fflush(f) != 0) {
+ daemon_log(LOG_ERR, "Failed to write callout event: %s", strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+#define set_env(key, value) putenv(avahi_strdup_printf("%s=%s", (key), (value)))
+
+static int drop_privs(void) {
+ struct passwd *pw;
+ struct group * gr;
+ 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);
+ }
+
+ /* Create directory */
+ 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;
+ }
+ }
+
+#ifdef HAVE_CHROOT
+
+ if (!no_chroot) {
+ if (chroot(AVAHI_IPDATA_DIR) < 0) {
+ daemon_log(LOG_ERR, "Failed to chroot(): %s", strerror(errno));
+ return -1;
+ }
+
+ daemon_log(LOG_INFO, "Successfully called chroot().");
+ chdir("/");
+
+ /* Since we are now trapped inside a chroot we cannot remove
+ * the pid file anymore, the helper process will do that for us. */
+ wrote_pid_file = 0;
+ }
+
+#endif
+
+ if (!no_drop_root) {
+
+ if (initgroups(AVAHI_AUTOIPD_USER, gr->gr_gid) != 0) {
+ 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)
+ if ((r = setgid(gr->gr_gid)) >= 0)
+ r = setegid(gr->gr_gid);
+#elif defined(HAVE_SETREGID)
+ r = setregid(gr->gr_gid, gr->gr_gid);
+#else
+#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)
+ if ((r = setuid(pw->pw_uid)) >= 0)
+ r = seteuid(pw->pw_uid);
+#elif defined(HAVE_SETREUID)
+ r = setreuid(pw->pw_uid, pw->pw_uid);
+#else
+#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_INFO, "Successfully dropped root privileges.");
+ }
+
+ return 0;
+}
+
static int loop(int iface, uint32_t addr) {
enum {
FD_ARP,
FD_IFACE,
+ FD_SIGNAL,
FD_MAX
};
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;
+ FILE *dispatcher = NULL;
+ char *address_fn = NULL;
+ const char *p;
+
+ daemon_signal_init(SIGINT, SIGTERM, SIGCHLD, SIGHUP, 0);
+
+ if (!(dispatcher = fork_dispatcher()))
+ goto fail;
if ((fd = open_socket(iface, hw_address)) < 0)
goto fail;
if ((iface_fd = iface_init(iface)) < 0)
goto fail;
- if (iface_get_initial_state(&state) < 0)
+ if (drop_privs() < 0)
+ goto fail;
+
+ if (force_bind)
+ st = STATE_START;
+ else if (iface_get_initial_state(&st) < 0)
goto fail;
-
+
+#ifdef HAVE_CHROOT
+ if (!no_chroot)
+ p = "";
+ 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)
daemon_log(LOG_INFO, "Routable address already assigned, sleeping.");
+ if (!retval_sent && (!wait_for_address || state == STATE_SLEEPING)) {
+ daemon_retval_send(0);
+ retval_sent = 1;
+ }
+
memset(pollfds, 0, sizeof(pollfds));
pollfds[FD_ARP].fd = fd;
pollfds[FD_ARP].events = POLLIN;
pollfds[FD_IFACE].fd = iface_fd;
pollfds[FD_IFACE].events = POLLIN;
-
+ pollfds[FD_SIGNAL].fd = daemon_signal_fd();
+ pollfds[FD_SIGNAL].events = POLLIN;
+
for (;;) {
int r, timeout;
AvahiUsec usec;
if (state == STATE_START) {
/* First, wait a random time */
- set_state(STATE_WAITING_PROBE, 1);
+ set_state(STATE_WAITING_PROBE, 1, addr);
elapse_time(&next_wakeup, 0, PROBE_WAIT*1000);
next_wakeup_valid = 1;
/* Send a probe */
out_packet = packet_new_probe(addr, hw_address, &out_packet_len);
- set_state(STATE_PROBING, 0);
+ set_state(STATE_PROBING, 0, addr);
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 */
out_packet = packet_new_probe(addr, hw_address, &out_packet_len);
- set_state(STATE_WAITING_ANNOUNCE, 1);
+ set_state(STATE_WAITING_ANNOUNCE, 1, addr);
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)) {
/* Send announcement packet */
out_packet = packet_new_announcement(addr, hw_address, &out_packet_len);
- set_state(STATE_ANNOUNCING, 0);
+ set_state(STATE_ANNOUNCING, 0, addr);
elapse_time(&next_wakeup, ANNOUNCE_INTERVAL*1000, 0);
next_wakeup_valid = 1;
-
+
if (n_iteration == 0) {
- add_address(iface, addr);
+ if (do_callout(dispatcher, CALLOUT_BIND, iface, addr) < 0)
+ goto fail;
+
n_conflict = 0;
}
} else if ((state == STATE_ANNOUNCING && event == EVENT_TIMEOUT && n_iteration >= ANNOUNCE_NUM-1)) {
daemon_log(LOG_INFO, "Successfully claimed IP address %s", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
- set_state(STATE_RUNNING, 0);
-
+ set_state(STATE_RUNNING, 0, addr);
+
+ next_wakeup_valid = 0;
+
+ save_address(address_fn, addr);
+
+ if (!retval_sent) {
+ daemon_retval_send(0);
+ retval_sent = 1;
+ }
+
} else if (event == EVENT_PACKET) {
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);
- daemon_log(LOG_INFO, "Recieved conflicting probe ARP packet.");
+
+ if (conflict)
+ daemon_log(LOG_INFO, "Received conflicting probe ARP packet.");
}
if (conflict) {
-
+
if (state == STATE_RUNNING || state == STATE_ANNOUNCING)
- remove_address(iface, addr);
-
+ 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);
-
+ 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);
next_wakeup_valid = 1;
} else
- daemon_log(LOG_DEBUG, "Ignoring ARP packet.");
+ 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.");
- set_state(STATE_SLEEPING, 1);
-
if (state == STATE_RUNNING || state == STATE_ANNOUNCING)
- remove_address(iface, addr);
-
- } else if (event == EVENT_ROUTABLE_ADDR_UNCONFIGURED && state == STATE_SLEEPING) {
+ if (do_callout(dispatcher, CALLOUT_UNBIND, iface, addr) < 0)
+ goto fail;
+
+ if (!retval_sent) {
+ 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.");
- set_state(STATE_WAITING_PROBE, 1);
+ set_state(STATE_WAITING_PROBE, 1, addr);
elapse_time(&next_wakeup, 0, PROBE_WAIT*1000);
next_wakeup_valid = 1;
-
+
+ } 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) {
- daemon_log(LOG_DEBUG, "sending...");
-
+ 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;
}
- daemon_log(LOG_DEBUG, "sleeping %ims", timeout);
-
+ DEBUG(daemon_log(LOG_DEBUG, "sleeping %ims", timeout));
+
while ((r = poll(pollfds, FD_MAX, timeout)) < 0 && errno == EINTR)
;
if (r < 0) {
daemon_log(LOG_ERR, "poll() failed: %s", strerror(r));
- break;
+ goto fail;
} else if (r == 0) {
event = EVENT_TIMEOUT;
next_wakeup_valid = 0;
} else {
- if (pollfds[FD_ARP].revents == POLLIN) {
- if (recv_packet(fd, &in_packet, &in_packet_len) < 0)
- goto fail;
-
- if (in_packet)
- event = EVENT_PACKET;
+
+ if (pollfds[FD_ARP].revents) {
+
+ if (pollfds[FD_ARP].revents == POLLERR) {
+ /* The interface is probably down, let's recreate our socket */
+
+ 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 == POLLIN) {
-
+ pollfds[FD_IFACE].revents) {
+
+ assert(pollfds[FD_IFACE].revents == POLLIN);
+
if (iface_process(&event) < 0)
goto fail;
}
+
+ if (event == EVENT_NULL &&
+ pollfds[FD_SIGNAL].revents) {
+
+ int sig;
+ assert(pollfds[FD_SIGNAL].revents == POLLIN);
+
+ if ((sig = daemon_signal_next()) <= 0) {
+ daemon_log(LOG_ERR, "daemon_signal_next() failed");
+ goto fail;
+ }
+
+ switch(sig) {
+ case SIGINT:
+ case SIGTERM:
+ daemon_log(LOG_INFO, "Got %s, quitting.", sig == SIGINT ? "SIGINT" : "SIGTERM");
+ ret = 0;
+ goto fail;
+
+ case SIGCHLD:
+ waitpid(-1, NULL, WNOHANG);
+ break;
+
+ case SIGHUP:
+ event = EVENT_REFRESH_REQUEST;
+ break;
+ }
+
+ }
}
}
ret = 0;
-
+
fail:
+ if (state == STATE_RUNNING || state == STATE_ANNOUNCING)
+ do_callout(dispatcher, CALLOUT_STOP, iface, addr);
+
avahi_free(out_packet);
avahi_free(in_packet);
-
+
if (fd >= 0)
- close(fd);
+ close_socket(fd);
if (iface_fd >= 0)
iface_done();
-
+
+ if (daemonize && !retval_sent)
+ daemon_retval_send(ret);
+
+ if (dispatcher)
+ fclose(dispatcher);
+
+ if (address_fn)
+ avahi_free(address_fn);
+
return ret;
}
-static int get_ifindex(const char *name) {
- int fd = -1;
- struct ifreq ifreq;
- if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
- daemon_log(LOG_ERR, "socket() failed: %s", strerror(errno));
- goto fail;
+static void help(FILE *f, const char *a0) {
+ fprintf(f,
+ "%s [options] INTERFACE\n"
+ " -h --help Show this help\n"
+ " -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 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
+ " --no-chroot Don't chroot()\n"
+#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_DEBUG,
+ OPTION_NO_DROP_ROOT,
+#ifdef HAVE_CHROOT
+ OPTION_NO_CHROOT
+#endif
+ };
+
+ static const struct option long_options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "daemonize", no_argument, NULL, 'D' },
+ { "syslog", no_argument, NULL, 's' },
+ { "kill", no_argument, NULL, 'k' },
+ { "refresh", no_argument, NULL, 'r' },
+ { "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
+ { "no-chroot", no_argument, NULL, OPTION_NO_CHROOT },
+#endif
+ { "no-proc-title", no_argument, NULL, OPTION_NO_PROC_TITLE },
+ { "debug", no_argument, NULL, OPTION_DEBUG },
+ { NULL, 0, NULL, 0 }
+ };
+
+ while ((c = getopt_long(argc, argv, "hDskrcVS:t:w", long_options, NULL)) >= 0) {
+
+ switch(c) {
+ case 's':
+ use_syslog = 1;
+ break;
+ case 'h':
+ command = DAEMON_HELP;
+ break;
+ case 'D':
+ daemonize = 1;
+ break;
+ case 'k':
+ command = DAEMON_KILL;
+ break;
+ case 'V':
+ command = DAEMON_VERSION;
+ break;
+ case 'r':
+ command = DAEMON_REFRESH;
+ break;
+ case 'c':
+ 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;
+
+ case OPTION_DEBUG:
+ debug = 1;
+ break;
+
+ case OPTION_FORCE_BIND:
+ force_bind = 1;
+ break;
+
+ case OPTION_NO_DROP_ROOT:
+ no_drop_root = 1;
+ break;
+
+#ifdef HAVE_CHROOT
+ case OPTION_NO_CHROOT:
+ no_chroot = 1;
+ break;
+#endif
+
+ default:
+ return -1;
+ }
}
- memset(&ifreq, 0, sizeof(ifreq));
- strncpy(ifreq.ifr_name, name, IFNAMSIZ-1);
- ifreq.ifr_name[IFNAMSIZ-1] = 0;
+ if (command == DAEMON_RUN ||
+ command == DAEMON_KILL ||
+ command == DAEMON_REFRESH ||
+ command == DAEMON_CHECK) {
- if (ioctl(fd, SIOCGIFINDEX, &ifreq) < 0) {
- daemon_log(LOG_ERR, "SIOCGIFINDEX failed: %s", strerror(errno));
- goto fail;
+ if (optind >= argc) {
+ fprintf(stderr, "Missing interface name.\n");
+ return -1;
+ }
+
+ interface_name = avahi_strdup(argv[optind++]);
}
- return ifreq.ifr_ifindex;
+ if (optind != argc) {
+ fprintf(stderr, "Too many arguments\n");
+ return -1;
+ }
-fail:
+ if (!action_script)
+ action_script = avahi_strdup(AVAHI_IPCONF_SCRIPT);
- if (fd >= 0)
- close(fd);
-
- return -1;
+ return 0;
+}
+
+static const char* pid_file_proc(void) {
+ return pid_file_name;
}
int main(int argc, char*argv[]) {
- int ret = 1;
- int ifindex;
- uint32_t addr = 0;
+ int r = 1;
+ char *log_ident = NULL;
- avahi_init_proc_title(argc, argv);
-
- init_rand_seed();
+ signal(SIGPIPE, SIG_IGN);
- if ((ifindex = get_ifindex(argc >= 2 ? argv[1] : "eth0")) < 0)
- goto fail;
+ if ((argv0 = strrchr(argv[0], '/')))
+ argv0 = avahi_strdup(argv0 + 1);
+ else
+ argv0 = avahi_strdup(argv[0]);
- if (argc >= 3)
- addr = inet_addr(argv[2]);
-
- if (loop(ifindex, addr) < 0)
- goto fail;
-
- ret = 0;
+ daemon_log_ident = argv0;
-
-fail:
-
- return ret;
-}
+ if (parse_command_line(argc, argv) < 0)
+ goto finish;
+
+ if (modify_proc_title)
+ avahi_init_proc_title(argc, argv);
+
+ daemon_log_ident = log_ident = avahi_strdup_printf("%s(%s)", argv0, interface_name);
+ daemon_pid_file_proc = pid_file_proc;
+ pid_file_name = avahi_strdup_printf(AVAHI_RUNTIME_DIR"/avahi-autoipd.%s.pid", interface_name);
+
+ if (command == DAEMON_RUN) {
+ pid_t pid;
+ 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 (getuid() != 0) {
+ daemon_log(LOG_ERR, "This program is intended to be run as root.");
+ goto finish;
+ }
-/* TODO:
+ if ((pid = daemon_pid_file_is_running()) >= 0) {
+ daemon_log(LOG_ERR, "Daemon already running on PID %u", pid);
+ goto finish;
+ }
+
+ if (daemonize) {
+ daemon_retval_init();
+
+ if ((pid = daemon_fork()) < 0)
+ goto finish;
+ else if (pid != 0) {
+ int ret;
+ /** Parent **/
+
+ if ((ret = daemon_retval_wait(20)) < 0) {
+ daemon_log(LOG_ERR, "Could not receive return value from daemon process.");
+ goto finish;
+ }
+
+ r = ret;
+ goto finish;
+ }
+
+ /* Child */
+ }
+
+ if (use_syslog || daemonize)
+ daemon_log_use = DAEMON_LOG_SYSLOG;
+
+ chdir("/");
+
+ if (daemon_pid_file_create() < 0) {
+ daemon_log(LOG_ERR, "Failed to create PID file: %s", strerror(errno));
+
+ if (daemonize)
+ daemon_retval_send(1);
+ goto finish;
+ } else
+ wrote_pid_file = 1;
+
+ avahi_set_proc_title(argv0, "%s: [%s] starting up", argv0, interface_name);
-- netlink
-- man page
-- user script
-- chroot/drop privs/caps
-- daemonize
-- defend
-- signals
-- store last used address
-- cmdline
-- setproctitle
+ 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) {
+ daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno));
+ goto finish;
+ }
+
+ r = 0;
+ } else if (command == DAEMON_CHECK)
+ r = (daemon_pid_file_is_running() >= 0) ? 0 : 1;
+
+
+finish:
+
+ if (daemonize)
+ daemon_retval_done();
+
+ if (wrote_pid_file)
+ daemon_pid_file_remove();
+
+ avahi_free(log_ident);
+ avahi_free(pid_file_name);
+ avahi_free(argv0);
+ avahi_free(interface_name);
+ avahi_free(action_script);
+
+ return r;
+}
projects / catta / blobdiff