Differential D14460 Diff 39574 sbin/dhclient/dispatch.c

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sbin/dhclient/dispatch.c

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#include <sys/cdefs.h>		#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");		__FBSDID("$FreeBSD$");

#include "dhcpd.h"		#include "dhcpd.h"
#include "privsep.h"		#include "privsep.h"

#include <sys/ioctl.h>		#include <sys/ioctl.h>

		#include <assert.h>
#include <net/if_media.h>		#include <net/if_media.h>
#include <ifaddrs.h>		#include <ifaddrs.h>
#include <poll.h>		#include <poll.h>

		/* Assert that pointer p is aligned to at least align bytes */
		#define assert_aligned(p, align) assert((((uintptr_t)p) & ((align) - 1)) == 0)

struct protocol *protocols;		struct protocol *protocols;
struct timeout *timeouts;		struct timeout *timeouts;
static struct timeout *free_timeouts;		static struct timeout *free_timeouts;
static int interfaces_invalidated;		static int interfaces_invalidated;
void (bootp_packet_handler)(struct interface_info ,		void (bootp_packet_handler)(struct interface_info ,
struct dhcp_packet *, int, unsigned int,		struct dhcp_packet *, int, unsigned int,
struct iaddr, struct hardware *);		struct iaddr, struct hardware *);

static int interface_status(struct interface_info *ifinfo);		static int interface_status(struct interface_info *ifinfo);

/*		/*
* Use getifaddrs() to get a list of all the attached interfaces. For		* Use getifaddrs() to get a list of all the attached interfaces. For
* each interface that's of type INET and not the loopback interface,		* each interface that's of type INET and not the loopback interface,
* register that interface with the network I/O software, figure out		* register that interface with the network I/O software, figure out
* what subnet it's on, and add it to the list of interfaces.		* what subnet it's on, and add it to the list of interfaces.
*/		*/
void		void
discover_interfaces(struct interface_info *iface)		discover_interfaces(struct interface_info *iface)
{		{
struct ifaddrs ifap, ifa;		struct ifaddrs ifap, ifa;
struct sockaddr_in foo;
struct ifreq *tif;		struct ifreq *tif;

if (getifaddrs(&ifap) != 0)		if (getifaddrs(&ifap) != 0)
error("getifaddrs failed");		error("getifaddrs failed");

for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {		for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if ((ifa->ifa_flags & IFF_LOOPBACK) \|\|		if ((ifa->ifa_flags & IFF_LOOPBACK) \|\|
(ifa->ifa_flags & IFF_POINTOPOINT) \|\|		(ifa->ifa_flags & IFF_POINTOPOINT) \|\|
(!(ifa->ifa_flags & IFF_UP)))		(!(ifa->ifa_flags & IFF_UP)))
continue;		continue;

if (strcmp(iface->name, ifa->ifa_name))		if (strcmp(iface->name, ifa->ifa_name))
continue;		continue;

/*		/*
* If we have the capability, extract link information		* If we have the capability, extract link information
* and record it in a linked list.		* and record it in a linked list.
*/		*/
if (ifa->ifa_addr->sa_family == AF_LINK) {		if (ifa->ifa_addr->sa_family == AF_LINK) {
struct sockaddr_dl *foo =		struct sockaddr_dl *foo;
(struct sockaddr_dl *)ifa->ifa_addr;

		/*
		* The implementation of getifaddrs should guarantee
		* this alignment
		*/
		assert_aligned(ifa->ifa_addr,
		_Alignof(struct sockaddr_dl*));
		cemUnsubmitted Not Done Inline Actions Should this be the _Alignof the pointer type or the struct type? cem: Should this be the _Alignof the pointer type or the struct type?
		asomersAuthorUnsubmitted Not Done Inline Actions Good catch. asomers: Good catch.
		#ifdef __clang__
		#pragma clang diagnostic push
		#pragma clang diagnostic ignored "-Wcast-align"
		cemUnsubmitted Not Done Inline Actions Is this needed with the NO_WCAST_ALIGN Makefile variable? cem: Is this needed with the NO_WCAST_ALIGN Makefile variable?
		asomersAuthorUnsubmitted Not Done Inline Actions Technically no. But it will be needed if anybody ever reenables `WCAST_ALIGN` and fixes the other violations. asomers: Technically no. But it will be needed if anybody ever reenables `WCAST_ALIGN` and fixes the…
		#endif
		foo = (struct sockaddr_dl *)ifa->ifa_addr;
		#ifdef __clang__
		#pragma clang diagnostic pop
		#endif

iface->index = foo->sdl_index;		iface->index = foo->sdl_index;
iface->hw_address.hlen = foo->sdl_alen;		iface->hw_address.hlen = foo->sdl_alen;
iface->hw_address.htype = HTYPE_ETHER; /* XXX */		iface->hw_address.htype = HTYPE_ETHER; /* XXX */
memcpy(iface->hw_address.haddr,		memcpy(iface->hw_address.haddr,
LLADDR(foo), foo->sdl_alen);		LLADDR(foo), foo->sdl_alen);
} else if (ifa->ifa_addr->sa_family == AF_INET) {		} else if (ifa->ifa_addr->sa_family == AF_INET) {
		struct sockaddr_in foo;
struct iaddr addr;		struct iaddr addr;

memcpy(&foo, ifa->ifa_addr, sizeof(foo));		memcpy(&foo, ifa->ifa_addr, sizeof(foo));
if (foo.sin_addr.s_addr == htonl(INADDR_LOOPBACK))		if (foo.sin_addr.s_addr == htonl(INADDR_LOOPBACK))
continue;		continue;
if (!iface->ifp) {		if (!iface->ifp) {
if ((tif = calloc(1, sizeof(struct ifreq)))		if ((tif = calloc(1, sizeof(struct ifreq)))
== NULL)		== NULL)
▲ Show 20 Lines • Show All 319 Lines • ▼ Show 20 Lines	cancel_timeout(void (where)(void ), void *what)
if (q) {		if (q) {
q->next = free_timeouts;		q->next = free_timeouts;
free_timeouts = q;		free_timeouts = q;
}		}
}		}

/* Add a protocol to the list of protocols... */		/* Add a protocol to the list of protocols... */
void		void
add_protocol(char name, int fd, void (handler)(struct protocol *),		add_protocol(const char name, int fd, void (handler)(struct protocol *),
void *local)		void *local)
{		{
struct protocol *p;		struct protocol *p;

p = malloc(sizeof(*p));		p = malloc(sizeof(*p));
if (!p)		if (!p)
error("can't allocate protocol struct for %s", name);		error("can't allocate protocol struct for %s", name);

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