version 1.1, 2013/07/29 19:37:40
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version 1.1.1.3, 2016/11/02 09:57:01
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/* dnsmasq is Copyright (c) 2000-2013 Simon Kelley | /* dnsmasq is Copyright (c) 2000-2016 Simon Kelley |
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This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
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struct iface_param { |
struct iface_param { |
struct dhcp_context *current; |
struct dhcp_context *current; |
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struct dhcp_relay *relay; |
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struct in_addr relay_local; |
int ind; |
int ind; |
}; |
}; |
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Line 28 struct match_param {
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Line 30 struct match_param {
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struct in_addr netmask, broadcast, addr; |
struct in_addr netmask, broadcast, addr; |
}; |
}; |
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static int complete_context(struct in_addr local, int if_index, | static int complete_context(struct in_addr local, int if_index, char *label, |
struct in_addr netmask, struct in_addr broadcast, void *vparam); |
struct in_addr netmask, struct in_addr broadcast, void *vparam); |
static int check_listen_addrs(struct in_addr local, int if_index, | static int check_listen_addrs(struct in_addr local, int if_index, char *label, |
struct in_addr netmask, struct in_addr broadcast, void *vparam); |
struct in_addr netmask, struct in_addr broadcast, void *vparam); |
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static int relay_upstream4(struct dhcp_relay *relay, struct dhcp_packet *mess, size_t sz, int iface_index); |
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static struct dhcp_relay *relay_reply4(struct dhcp_packet *mess, char *arrival_interface); |
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static int make_fd(int port) |
static int make_fd(int port) |
{ |
{ |
Line 70 static int make_fd(int port)
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Line 74 static int make_fd(int port)
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support it. This handles the introduction of REUSEPORT on Linux. */ |
support it. This handles the introduction of REUSEPORT on Linux. */ |
if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND)) |
if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND)) |
{ |
{ |
int rc = -1, porterr = 0; | int rc = 0; |
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#ifdef SO_REUSEPORT |
#ifdef SO_REUSEPORT |
if ((rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt))) == -1 && |
if ((rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt))) == -1 && |
errno != ENOPROTOOPT) | errno == ENOPROTOOPT) |
porterr = 1; | rc = 0; |
#endif |
#endif |
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if (rc == -1 && !porterr) | if (rc != -1) |
rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &oneopt, sizeof(oneopt)); |
rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &oneopt, sizeof(oneopt)); |
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if (rc == -1) |
if (rc == -1) |
Line 132 void dhcp_packet(time_t now, int pxe_fd)
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Line 136 void dhcp_packet(time_t now, int pxe_fd)
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int fd = pxe_fd ? daemon->pxefd : daemon->dhcpfd; |
int fd = pxe_fd ? daemon->pxefd : daemon->dhcpfd; |
struct dhcp_packet *mess; |
struct dhcp_packet *mess; |
struct dhcp_context *context; |
struct dhcp_context *context; |
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struct dhcp_relay *relay; |
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int is_relay_reply = 0; |
struct iname *tmp; |
struct iname *tmp; |
struct ifreq ifr; |
struct ifreq ifr; |
struct msghdr msg; |
struct msghdr msg; |
Line 140 void dhcp_packet(time_t now, int pxe_fd)
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Line 146 void dhcp_packet(time_t now, int pxe_fd)
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struct iovec iov; |
struct iovec iov; |
ssize_t sz; |
ssize_t sz; |
int iface_index = 0, unicast_dest = 0, is_inform = 0; |
int iface_index = 0, unicast_dest = 0, is_inform = 0; |
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int rcvd_iface_index; |
struct in_addr iface_addr; |
struct in_addr iface_addr; |
struct iface_param parm; |
struct iface_param parm; |
#ifdef HAVE_LINUX_NETWORK |
#ifdef HAVE_LINUX_NETWORK |
Line 219 void dhcp_packet(time_t now, int pxe_fd)
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Line 226 void dhcp_packet(time_t now, int pxe_fd)
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strncpy(arp_req.arp_dev, ifr.ifr_name, 16); |
strncpy(arp_req.arp_dev, ifr.ifr_name, 16); |
#endif |
#endif |
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/* One form of bridging on BSD has the property that packets | /* If the interface on which the DHCP request was received is an |
can be recieved on bridge interfaces which do not have an IP address. | alias of some other interface (as specified by the |
We allow these to be treated as aliases of another interface which does have | --bridge-interface option), change ifr.ifr_name so that we look |
an IP address with --dhcp-bridge=interface,alias,alias */ | for DHCP contexts associated with the aliased interface instead |
| of with the aliasing one. */ |
| rcvd_iface_index = iface_index; |
for (bridge = daemon->bridges; bridge; bridge = bridge->next) |
for (bridge = daemon->bridges; bridge; bridge = bridge->next) |
{ |
{ |
for (alias = bridge->alias; alias; alias = alias->next) |
for (alias = bridge->alias; alias; alias = alias->next) |
if (strncmp(ifr.ifr_name, alias->iface, IF_NAMESIZE) == 0) | if (wildcard_matchn(alias->iface, ifr.ifr_name, IF_NAMESIZE)) |
{ |
{ |
if (!(iface_index = if_nametoindex(bridge->iface))) |
if (!(iface_index = if_nametoindex(bridge->iface))) |
{ |
{ |
my_syslog(LOG_WARNING, _("unknown interface %s in bridge-interface"), ifr.ifr_name); | my_syslog(MS_DHCP | LOG_WARNING, |
| _("unknown interface %s in bridge-interface"), |
| bridge->iface); |
return; |
return; |
} |
} |
else |
else |
Line 250 void dhcp_packet(time_t now, int pxe_fd)
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Line 261 void dhcp_packet(time_t now, int pxe_fd)
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unicast_dest = 1; |
unicast_dest = 1; |
#endif |
#endif |
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ifr.ifr_addr.sa_family = AF_INET; | if ((relay = relay_reply4((struct dhcp_packet *)daemon->dhcp_packet.iov_base, ifr.ifr_name))) |
if (ioctl(daemon->dhcpfd, SIOCGIFADDR, &ifr) != -1 ) | |
iface_addr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr; | |
else | |
{ |
{ |
my_syslog(MS_DHCP | LOG_WARNING, _("DHCP packet received on %s which has no address"), ifr.ifr_name); | /* Reply from server, using us as relay. */ |
return; | iface_index = relay->iface_index; |
| if (!indextoname(daemon->dhcpfd, iface_index, ifr.ifr_name)) |
| return; |
| is_relay_reply = 1; |
| iov.iov_len = sz; |
| #ifdef HAVE_LINUX_NETWORK |
| strncpy(arp_req.arp_dev, ifr.ifr_name, 16); |
| #endif |
} |
} |
| else |
for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next) | |
if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name)) | |
return; | |
| |
/* unlinked contexts are marked by context->current == context */ | |
for (context = daemon->dhcp; context; context = context->next) | |
context->current = context; | |
| |
parm.current = NULL; | |
parm.ind = iface_index; | |
| |
if (!iface_check(AF_INET, (struct all_addr *)&iface_addr, ifr.ifr_name, NULL)) | |
{ |
{ |
/* If we failed to match the primary address of the interface, see if we've got a --listen-address | ifr.ifr_addr.sa_family = AF_INET; |
for a secondary */ | if (ioctl(daemon->dhcpfd, SIOCGIFADDR, &ifr) != -1 ) |
struct match_param match; | iface_addr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr; |
| else |
| { |
| my_syslog(MS_DHCP | LOG_WARNING, _("DHCP packet received on %s which has no address"), ifr.ifr_name); |
| return; |
| } |
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match.matched = 0; | for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next) |
match.ind = iface_index; | if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name)) |
| return; |
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if (!daemon->if_addrs || | /* unlinked contexts/relays are marked by context->current == context */ |
!iface_enumerate(AF_INET, &match, check_listen_addrs) || | for (context = daemon->dhcp; context; context = context->next) |
!match.matched) | context->current = context; |
| |
| for (relay = daemon->relay4; relay; relay = relay->next) |
| relay->current = relay; |
| |
| parm.current = NULL; |
| parm.relay = NULL; |
| parm.relay_local.s_addr = 0; |
| parm.ind = iface_index; |
| |
| if (!iface_check(AF_INET, (struct all_addr *)&iface_addr, ifr.ifr_name, NULL)) |
| { |
| /* If we failed to match the primary address of the interface, see if we've got a --listen-address |
| for a secondary */ |
| struct match_param match; |
| |
| match.matched = 0; |
| match.ind = iface_index; |
| |
| if (!daemon->if_addrs || |
| !iface_enumerate(AF_INET, &match, check_listen_addrs) || |
| !match.matched) |
| return; |
| |
| iface_addr = match.addr; |
| /* make sure secondary address gets priority in case |
| there is more than one address on the interface in the same subnet */ |
| complete_context(match.addr, iface_index, NULL, match.netmask, match.broadcast, &parm); |
| } |
| |
| if (!iface_enumerate(AF_INET, &parm, complete_context)) |
return; |
return; |
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iface_addr = match.addr; | /* We're relaying this request */ |
/* make sure secondary address gets priority in case | if (parm.relay_local.s_addr != 0 && |
there is more than one address on the interface in the same subnet */ | relay_upstream4(parm.relay, (struct dhcp_packet *)daemon->dhcp_packet.iov_base, (size_t)sz, iface_index)) |
complete_context(match.addr, iface_index, match.netmask, match.broadcast, &parm); | return; |
} | |
| /* May have configured relay, but not DHCP server */ |
| if (!daemon->dhcp) |
| return; |
| |
| lease_prune(NULL, now); /* lose any expired leases */ |
| iov.iov_len = dhcp_reply(parm.current, ifr.ifr_name, iface_index, (size_t)sz, |
| now, unicast_dest, &is_inform, pxe_fd, iface_addr); |
| lease_update_file(now); |
| lease_update_dns(0); |
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if (!iface_enumerate(AF_INET, &parm, complete_context)) | if (iov.iov_len == 0) |
return; | return; |
| } |
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lease_prune(NULL, now); /* lose any expired leases */ |
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iov.iov_len = dhcp_reply(parm.current, ifr.ifr_name, iface_index, (size_t)sz, |
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now, unicast_dest, &is_inform, pxe_fd, iface_addr); |
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lease_update_file(now); |
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lease_update_dns(0); |
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if (iov.iov_len == 0) |
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return; |
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msg.msg_name = &dest; |
msg.msg_name = &dest; |
msg.msg_namelen = sizeof(dest); |
msg.msg_namelen = sizeof(dest); |
msg.msg_control = NULL; |
msg.msg_control = NULL; |
Line 321 void dhcp_packet(time_t now, int pxe_fd)
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Line 361 void dhcp_packet(time_t now, int pxe_fd)
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if (mess->ciaddr.s_addr != 0) |
if (mess->ciaddr.s_addr != 0) |
dest.sin_addr = mess->ciaddr; |
dest.sin_addr = mess->ciaddr; |
} |
} |
else if (mess->giaddr.s_addr) | else if (mess->giaddr.s_addr && !is_relay_reply) |
{ |
{ |
/* Send to BOOTP relay */ |
/* Send to BOOTP relay */ |
dest.sin_port = htons(daemon->dhcp_server_port); |
dest.sin_port = htons(daemon->dhcp_server_port); |
Line 334 void dhcp_packet(time_t now, int pxe_fd)
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Line 374 void dhcp_packet(time_t now, int pxe_fd)
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source port too, and send back to that. If we're replying |
source port too, and send back to that. If we're replying |
to a DHCPINFORM, trust the source address always. */ |
to a DHCPINFORM, trust the source address always. */ |
if ((!is_inform && dest.sin_addr.s_addr != mess->ciaddr.s_addr) || |
if ((!is_inform && dest.sin_addr.s_addr != mess->ciaddr.s_addr) || |
dest.sin_port == 0 || dest.sin_addr.s_addr == 0) | dest.sin_port == 0 || dest.sin_addr.s_addr == 0 || is_relay_reply) |
{ |
{ |
dest.sin_port = htons(daemon->dhcp_client_port); |
dest.sin_port = htons(daemon->dhcp_client_port); |
dest.sin_addr = mess->ciaddr; |
dest.sin_addr = mess->ciaddr; |
} |
} |
} |
} |
#if defined(HAVE_LINUX_NETWORK) |
#if defined(HAVE_LINUX_NETWORK) |
else if ((ntohs(mess->flags) & 0x8000) || mess->hlen == 0 || | else |
mess->hlen > sizeof(ifr.ifr_addr.sa_data) || mess->htype == 0) | |
{ |
{ |
/* broadcast to 255.255.255.255 (or mac address invalid) */ | /* fill cmsg for outbound interface (both broadcast & unicast) */ |
struct in_pktinfo *pkt; |
struct in_pktinfo *pkt; |
msg.msg_control = control_u.control; |
msg.msg_control = control_u.control; |
msg.msg_controllen = sizeof(control_u); |
msg.msg_controllen = sizeof(control_u); |
cmptr = CMSG_FIRSTHDR(&msg); |
cmptr = CMSG_FIRSTHDR(&msg); |
pkt = (struct in_pktinfo *)CMSG_DATA(cmptr); |
pkt = (struct in_pktinfo *)CMSG_DATA(cmptr); |
pkt->ipi_ifindex = iface_index; | pkt->ipi_ifindex = rcvd_iface_index; |
pkt->ipi_spec_dst.s_addr = 0; |
pkt->ipi_spec_dst.s_addr = 0; |
msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); |
msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); |
cmptr->cmsg_level = IPPROTO_IP; |
cmptr->cmsg_level = IPPROTO_IP; |
cmptr->cmsg_type = IP_PKTINFO; | cmptr->cmsg_type = IP_PKTINFO; |
dest.sin_addr.s_addr = INADDR_BROADCAST; | |
dest.sin_port = htons(daemon->dhcp_client_port); | if ((ntohs(mess->flags) & 0x8000) || mess->hlen == 0 || |
| mess->hlen > sizeof(ifr.ifr_addr.sa_data) || mess->htype == 0) |
| { |
| /* broadcast to 255.255.255.255 (or mac address invalid) */ |
| dest.sin_addr.s_addr = INADDR_BROADCAST; |
| dest.sin_port = htons(daemon->dhcp_client_port); |
| } |
| else |
| { |
| /* unicast to unconfigured client. Inject mac address direct into ARP cache. |
| struct sockaddr limits size to 14 bytes. */ |
| dest.sin_addr = mess->yiaddr; |
| dest.sin_port = htons(daemon->dhcp_client_port); |
| memcpy(&arp_req.arp_pa, &dest, sizeof(struct sockaddr_in)); |
| arp_req.arp_ha.sa_family = mess->htype; |
| memcpy(arp_req.arp_ha.sa_data, mess->chaddr, mess->hlen); |
| /* interface name already copied in */ |
| arp_req.arp_flags = ATF_COM; |
| if (ioctl(daemon->dhcpfd, SIOCSARP, &arp_req) == -1) |
| my_syslog(MS_DHCP | LOG_ERR, _("ARP-cache injection failed: %s"), strerror(errno)); |
| } |
} |
} |
else |
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{ |
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/* unicast to unconfigured client. Inject mac address direct into ARP cache. |
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struct sockaddr limits size to 14 bytes. */ |
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dest.sin_addr = mess->yiaddr; |
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dest.sin_port = htons(daemon->dhcp_client_port); |
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memcpy(&arp_req.arp_pa, &dest, sizeof(struct sockaddr_in)); |
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arp_req.arp_ha.sa_family = mess->htype; |
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memcpy(arp_req.arp_ha.sa_data, mess->chaddr, mess->hlen); |
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/* interface name already copied in */ |
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arp_req.arp_flags = ATF_COM; |
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ioctl(daemon->dhcpfd, SIOCSARP, &arp_req); |
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} |
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#elif defined(HAVE_SOLARIS_NETWORK) |
#elif defined(HAVE_SOLARIS_NETWORK) |
else if ((ntohs(mess->flags) & 0x8000) || mess->hlen != ETHER_ADDR_LEN || mess->htype != ARPHRD_ETHER) |
else if ((ntohs(mess->flags) & 0x8000) || mess->hlen != ETHER_ADDR_LEN || mess->htype != ARPHRD_ETHER) |
{ |
{ |
Line 407 void dhcp_packet(time_t now, int pxe_fd)
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Line 453 void dhcp_packet(time_t now, int pxe_fd)
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setsockopt(fd, IPPROTO_IP, IP_BOUND_IF, &iface_index, sizeof(iface_index)); |
setsockopt(fd, IPPROTO_IP, IP_BOUND_IF, &iface_index, sizeof(iface_index)); |
#endif |
#endif |
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while(sendmsg(fd, &msg, 0) == -1 && retry_send()); | while(retry_send(sendmsg(fd, &msg, 0))); |
| |
| /* This can fail when, eg, iptables DROPS destination 255.255.255.255 */ |
| if (errno != 0) |
| my_syslog(MS_DHCP | LOG_WARNING, _("Error sending DHCP packet to %s: %s"), |
| inet_ntoa(dest.sin_addr), strerror(errno)); |
} |
} |
| |
/* check against secondary interface addresses */ |
/* check against secondary interface addresses */ |
static int check_listen_addrs(struct in_addr local, int if_index, | static int check_listen_addrs(struct in_addr local, int if_index, char *label, |
struct in_addr netmask, struct in_addr broadcast, void *vparam) |
struct in_addr netmask, struct in_addr broadcast, void *vparam) |
{ |
{ |
struct match_param *param = vparam; |
struct match_param *param = vparam; |
struct iname *tmp; |
struct iname *tmp; |
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(void) label; |
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if (if_index == param->ind) |
if (if_index == param->ind) |
{ |
{ |
for (tmp = daemon->if_addrs; tmp; tmp = tmp->next) |
for (tmp = daemon->if_addrs; tmp; tmp = tmp->next) |
Line 444 static int check_listen_addrs(struct in_addr local, in
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Line 497 static int check_listen_addrs(struct in_addr local, in
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Note that the current chain may be superceded later for configured hosts or those coming via gateways. */ |
Note that the current chain may be superceded later for configured hosts or those coming via gateways. */ |
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static int complete_context(struct in_addr local, int if_index, | static int complete_context(struct in_addr local, int if_index, char *label, |
struct in_addr netmask, struct in_addr broadcast, void *vparam) |
struct in_addr netmask, struct in_addr broadcast, void *vparam) |
{ |
{ |
struct dhcp_context *context; |
struct dhcp_context *context; |
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struct dhcp_relay *relay; |
struct iface_param *param = vparam; |
struct iface_param *param = vparam; |
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(void)label; |
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for (context = daemon->dhcp; context; context = context->next) |
for (context = daemon->dhcp; context; context = context->next) |
{ |
{ |
Line 491 static int complete_context(struct in_addr local, int
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Line 547 static int complete_context(struct in_addr local, int
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} |
} |
} |
} |
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for (relay = daemon->relay4; relay; relay = relay->next) |
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if (if_index == param->ind && relay->local.addr.addr4.s_addr == local.s_addr && relay->current == relay && |
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(param->relay_local.s_addr == 0 || param->relay_local.s_addr == local.s_addr)) |
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{ |
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relay->current = param->relay; |
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param->relay = relay; |
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param->relay_local = local; |
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} |
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return 1; |
return 1; |
} |
} |
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Line 588 int address_allocate(struct dhcp_context *context,
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Line 653 int address_allocate(struct dhcp_context *context,
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/* hash hwaddr: use the SDBM hashing algorithm. Seems to give good |
/* hash hwaddr: use the SDBM hashing algorithm. Seems to give good |
dispersal even with similarly-valued "strings". */ |
dispersal even with similarly-valued "strings". */ |
for (j = 0, i = 0; i < hw_len; i++) |
for (j = 0, i = 0; i < hw_len; i++) |
j += hwaddr[i] + (j << 6) + (j << 16) - j; | j = hwaddr[i] + (j << 6) + (j << 16) - j; |
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for (pass = 0; pass <= 1; pass++) |
for (pass = 0; pass <= 1; pass++) |
for (c = context; c; c = c->current) |
for (c = context; c; c = c->current) |
Line 700 int address_allocate(struct dhcp_context *context,
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Line 765 int address_allocate(struct dhcp_context *context,
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return 0; |
return 0; |
} |
} |
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static int is_addr_in_context(struct dhcp_context *context, struct dhcp_config *config) |
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{ |
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if (!context) /* called via find_config() from lease_update_from_configs() */ |
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return 1; |
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if (!(config->flags & CONFIG_ADDR)) |
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return 1; |
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for (; context; context = context->current) |
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if (is_same_net(config->addr, context->start, context->netmask)) |
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return 1; |
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return 0; |
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} |
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int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type) |
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{ |
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struct hwaddr_config *conf_addr; |
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for (conf_addr = config->hwaddr; conf_addr; conf_addr = conf_addr->next) |
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if (conf_addr->wildcard_mask == 0 && |
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conf_addr->hwaddr_len == len && |
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(conf_addr->hwaddr_type == type || conf_addr->hwaddr_type == 0) && |
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memcmp(conf_addr->hwaddr, hwaddr, len) == 0) |
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return 1; |
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return 0; |
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} |
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struct dhcp_config *find_config(struct dhcp_config *configs, |
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struct dhcp_context *context, |
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unsigned char *clid, int clid_len, |
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unsigned char *hwaddr, int hw_len, |
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int hw_type, char *hostname) |
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{ |
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int count, new; |
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struct dhcp_config *config, *candidate; |
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struct hwaddr_config *conf_addr; |
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if (clid) |
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for (config = configs; config; config = config->next) |
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if (config->flags & CONFIG_CLID) |
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{ |
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if (config->clid_len == clid_len && |
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memcmp(config->clid, clid, clid_len) == 0 && |
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is_addr_in_context(context, config)) |
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return config; |
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/* dhcpcd prefixes ASCII client IDs by zero which is wrong, but we try and |
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cope with that here */ |
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if (*clid == 0 && config->clid_len == clid_len-1 && |
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memcmp(config->clid, clid+1, clid_len-1) == 0 && |
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is_addr_in_context(context, config)) |
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return config; |
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} |
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|
|
for (config = configs; config; config = config->next) |
|
if (config_has_mac(config, hwaddr, hw_len, hw_type) && |
|
is_addr_in_context(context, config)) |
|
return config; |
|
|
|
if (hostname && context) |
|
for (config = configs; config; config = config->next) |
|
if ((config->flags & CONFIG_NAME) && |
|
hostname_isequal(config->hostname, hostname) && |
|
is_addr_in_context(context, config)) |
|
return config; |
|
|
|
/* use match with fewest wildcard octets */ |
|
for (candidate = NULL, count = 0, config = configs; config; config = config->next) |
|
if (is_addr_in_context(context, config)) |
|
for (conf_addr = config->hwaddr; conf_addr; conf_addr = conf_addr->next) |
|
if (conf_addr->wildcard_mask != 0 && |
|
conf_addr->hwaddr_len == hw_len && |
|
(conf_addr->hwaddr_type == hw_type || conf_addr->hwaddr_type == 0) && |
|
(new = memcmp_masked(conf_addr->hwaddr, hwaddr, hw_len, conf_addr->wildcard_mask)) > count) |
|
{ |
|
count = new; |
|
candidate = config; |
|
} |
|
|
|
return candidate; |
|
} |
|
|
|
void dhcp_read_ethers(void) |
void dhcp_read_ethers(void) |
{ |
{ |
FILE *f = fopen(ETHERSFILE, "r"); |
FILE *f = fopen(ETHERSFILE, "r"); |
Line 984 char *host_from_dns(struct in_addr addr)
|
Line 966 char *host_from_dns(struct in_addr addr)
|
return NULL; |
return NULL; |
} |
} |
|
|
#endif | static int relay_upstream4(struct dhcp_relay *relay, struct dhcp_packet *mess, size_t sz, int iface_index) |
| { |
| /* ->local is same value for all relays on ->current chain */ |
| struct all_addr from; |
| |
| if (mess->op != BOOTREQUEST) |
| return 0; |
|
|
|
/* source address == relay address */ |
|
from.addr.addr4 = relay->local.addr.addr4; |
|
|
|
/* already gatewayed ? */ |
|
if (mess->giaddr.s_addr) |
|
{ |
|
/* if so check if by us, to stomp on loops. */ |
|
if (mess->giaddr.s_addr == relay->local.addr.addr4.s_addr) |
|
return 1; |
|
} |
|
else |
|
{ |
|
/* plug in our address */ |
|
mess->giaddr.s_addr = relay->local.addr.addr4.s_addr; |
|
} |
|
|
|
if ((mess->hops++) > 20) |
|
return 1; |
|
|
|
for (; relay; relay = relay->current) |
|
{ |
|
union mysockaddr to; |
|
|
|
to.sa.sa_family = AF_INET; |
|
to.in.sin_addr = relay->server.addr.addr4; |
|
to.in.sin_port = htons(daemon->dhcp_server_port); |
|
|
|
send_from(daemon->dhcpfd, 0, (char *)mess, sz, &to, &from, 0); |
|
|
|
if (option_bool(OPT_LOG_OPTS)) |
|
{ |
|
inet_ntop(AF_INET, &relay->local, daemon->addrbuff, ADDRSTRLEN); |
|
my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay %s -> %s"), daemon->addrbuff, inet_ntoa(relay->server.addr.addr4)); |
|
} |
|
|
|
/* Save this for replies */ |
|
relay->iface_index = iface_index; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
|
|
static struct dhcp_relay *relay_reply4(struct dhcp_packet *mess, char *arrival_interface) |
|
{ |
|
struct dhcp_relay *relay; |
|
|
|
if (mess->giaddr.s_addr == 0 || mess->op != BOOTREPLY) |
|
return NULL; |
|
|
|
for (relay = daemon->relay4; relay; relay = relay->next) |
|
{ |
|
if (mess->giaddr.s_addr == relay->local.addr.addr4.s_addr) |
|
{ |
|
if (!relay->interface || wildcard_match(relay->interface, arrival_interface)) |
|
return relay->iface_index != 0 ? relay : NULL; |
|
} |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
#endif |