/*
 * radclient.c	General radius packet debug tool.
 *
 * Version:	$Id$
 *
 *   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
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * Copyright 2000,2006  The FreeRADIUS server project
 * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
 * Copyright 2000  Alan DeKok <aland@ox.org>
 */

#include <freeradius-devel/ident.h>
RCSID("$Id$")

#include <freeradius-devel/libradius.h>
#include <freeradius-devel/conf.h>
#include <freeradius-devel/radpaths.h>

#include <ctype.h>

#ifdef HAVE_GETOPT_H
#	include <getopt.h>
#endif

#include <assert.h>

static int success = 0;
static int retries = 3;
static float timeout = 5;
static const char *secret = NULL;
static int do_output = 1;
static int totalapp = 0;
static int totaldeny = 0;
static int totallost = 0;

static int server_port = 0;
static int packet_code = 0;
static fr_ipaddr_t server_ipaddr;
static int resend_count = 1;
static int done = 1;
static int print_filename = 0;

static fr_ipaddr_t client_ipaddr;
static int client_port = 0;

static int sockfd;
static int last_used_id = -1;

static rbtree_t *filename_tree = NULL;
static fr_packet_list_t *pl = NULL;

static int sleep_time = -1;

typedef struct radclient_t {
	struct		radclient_t *prev;
	struct		radclient_t *next;

	const char	*filename;
	int		packet_number; /* in the file */
	char		password[256];
	time_t		timestamp;
	RADIUS_PACKET	*request;
	RADIUS_PACKET	*reply;
	int		resend;
	int		tries;
	int		done;
} radclient_t;

static radclient_t *radclient_head = NULL;
static radclient_t *radclient_tail = NULL;


static void NEVER_RETURNS usage(void)
{
	fprintf(stderr, "Usage: radclient [options] server[:port] <command> [<secret>]\n");

	fprintf(stderr, "  <command>    One of auth, acct, status, coa, or disconnect.\n");
	fprintf(stderr, "  -c count    Send each packet 'count' times.\n");
	fprintf(stderr, "  -d raddb    Set dictionary directory.\n");
	fprintf(stderr, "  -f file     Read packets from file, not stdin.\n");
	fprintf(stderr, "  -i id       Set request id to 'id'.  Values may be 0..255\n");
	fprintf(stderr, "  -n num      Send N requests/s\n");
	fprintf(stderr, "  -p num      Send 'num' packets from a file in parallel.\n");
	fprintf(stderr, "  -q          Do not print anything out.\n");
	fprintf(stderr, "  -r retries  If timeout, retry sending the packet 'retries' times.\n");
	fprintf(stderr, "  -s          Print out summary information of auth results.\n");
	fprintf(stderr, "  -S file     read secret from file, not command line.\n");
	fprintf(stderr, "  -t timeout  Wait 'timeout' seconds before retrying (may be a floating point number).\n");
	fprintf(stderr, "  -v          Show program version information.\n");
	fprintf(stderr, "  -x          Debugging mode.\n");
	fprintf(stderr, "  -4          Use IPv4 address of server\n");
	fprintf(stderr, "  -6          Use IPv6 address of server.\n");

	exit(1);
}

/*
 *	Free a radclient struct, which may (or may not)
 *	already be in the list.
 */
static void radclient_free(radclient_t *radclient)
{
	radclient_t *prev, *next;

	if (radclient->request) rad_free(&radclient->request);
	if (radclient->reply) rad_free(&radclient->reply);

	prev = radclient->prev;
	next = radclient->next;

	if (prev) {
		assert(radclient_head != radclient);
		prev->next = next;
	} else if (radclient_head) {
		assert(radclient_head == radclient);
		radclient_head = next;
	}

	if (next) {
		assert(radclient_tail != radclient);
		next->prev = prev;
	} else if (radclient_tail) {
		assert(radclient_tail == radclient);
		radclient_tail = prev;
	}

	free(radclient);
}

/*
 *	Initialize a radclient data structure and add it to
 *	the global linked list.
 */
static int radclient_init(const char *filename)
{
	FILE *fp;
	VALUE_PAIR *vp;
	radclient_t *radclient;
	int filedone = 0;
	int packet_number = 1;

	assert(filename != NULL);

	/*
	 *	Determine where to read the VP's from.
	 */
	if (strcmp(filename, "-") != 0) {
		fp = fopen(filename, "r");
		if (!fp) {
			fprintf(stderr, "radclient: Error opening %s: %s\n",
				filename, strerror(errno));
			return 0;
		}
	} else {
		fp = stdin;
	}

	/*
	 *	Loop until the file is done.
	 */
	do {
		/*
		 *	Allocate it.
		 */
		radclient = malloc(sizeof(*radclient));
		if (!radclient) {
			perror("radclient: X");
			if (fp != stdin) fclose(fp);
			return 0;
		}
		memset(radclient, 0, sizeof(*radclient));

		radclient->request = rad_alloc(1);
		if (!radclient->request) {
			fr_perror("radclient: Y");
			free(radclient);
			if (fp != stdin) fclose(fp);
			return 0;
		}

		radclient->filename = filename;
		radclient->request->id = -1; /* allocate when sending */
		radclient->packet_number = packet_number++;

		/*
		 *	Read the VP's.
		 */
		radclient->request->vps = readvp2(fp, &filedone, "radclient:");
		if (!radclient->request->vps) {
			rad_free(&radclient->request);
			free(radclient);
			if (fp != stdin) fclose(fp);
			return 1;
		}

		/*
		 *	Keep a copy of the the User-Password attribute.
		 */
		if ((vp = pairfind(radclient->request->vps, PW_USER_PASSWORD)) != NULL) {
			strlcpy(radclient->password, vp->vp_strvalue,
				sizeof(radclient->password));
			/*
			 *	Otherwise keep a copy of the CHAP-Password attribute.
			 */
		} else if ((vp = pairfind(radclient->request->vps, PW_CHAP_PASSWORD)) != NULL) {
			strlcpy(radclient->password, vp->vp_strvalue,
				sizeof(radclient->password));
		} else {
			radclient->password[0] = '\0';
		}

		/*
		 *  Fix up Digest-Attributes issues
		 */
		for (vp = radclient->request->vps; vp != NULL; vp = vp->next) {
			switch (vp->attribute) {
			default:
				break;

				/*
				 *	Allow it to set the packet type in
				 *	the attributes read from the file.
				 */
			case PW_PACKET_TYPE:
				radclient->request->code = vp->vp_integer;
				break;

			case PW_PACKET_DST_PORT:
				radclient->request->dst_port = (vp->vp_integer & 0xffff);
				break;

			case PW_PACKET_DST_IP_ADDRESS:
				radclient->request->dst_ipaddr.af = AF_INET;
				radclient->request->dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
				break;

			case PW_PACKET_DST_IPV6_ADDRESS:
				radclient->request->dst_ipaddr.af = AF_INET6;
				radclient->request->dst_ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
				break;

			case PW_PACKET_SRC_PORT:
				radclient->request->src_port = (vp->vp_integer & 0xffff);
				break;

			case PW_PACKET_SRC_IP_ADDRESS:
				radclient->request->src_ipaddr.af = AF_INET;
				radclient->request->src_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
				break;

			case PW_PACKET_SRC_IPV6_ADDRESS:
				radclient->request->src_ipaddr.af = AF_INET6;
				radclient->request->src_ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
				break;

			case PW_DIGEST_REALM:
			case PW_DIGEST_NONCE:
			case PW_DIGEST_METHOD:
			case PW_DIGEST_URI:
			case PW_DIGEST_QOP:
			case PW_DIGEST_ALGORITHM:
			case PW_DIGEST_BODY_DIGEST:
			case PW_DIGEST_CNONCE:
			case PW_DIGEST_NONCE_COUNT:
			case PW_DIGEST_USER_NAME:
				/* overlapping! */
				memmove(&vp->vp_octets[2], &vp->vp_octets[0],
					vp->length);
				vp->vp_octets[0] = vp->attribute - PW_DIGEST_REALM + 1;
				vp->length += 2;
				vp->vp_octets[1] = vp->length;
				vp->attribute = PW_DIGEST_ATTRIBUTES;
				break;
			}
		} /* loop over the VP's we read in */

		/*
		 *	Add it to the tail of the list.
		 */
		if (!radclient_head) {
			assert(radclient_tail == NULL);
			radclient_head = radclient;
			radclient->prev = NULL;
		} else {
			assert(radclient_tail->next == NULL);
			radclient_tail->next = radclient;
			radclient->prev = radclient_tail;
		}
		radclient_tail = radclient;
		radclient->next = NULL;

	} while (!filedone); /* loop until the file is done. */

	if (fp != stdin) fclose(fp);

	/*
	 *	And we're done.
	 */
	return 1;
}


/*
 *	Sanity check each argument.
 */
static int radclient_sane(radclient_t *radclient)
{
	if (radclient->request->dst_port == 0) {
		radclient->request->dst_port = server_port;
	}
	if (radclient->request->dst_ipaddr.af == AF_UNSPEC) {
		if (server_ipaddr.af == AF_UNSPEC) {
			fprintf(stderr, "radclient: No server was given, but request %d in file %s did not contain Packet-Dst-IP-Address\n",
				radclient->packet_number, radclient->filename);
			return -1;
		}
		radclient->request->dst_ipaddr = server_ipaddr;
	}
	if (radclient->request->code == 0) {
		if (packet_code == -1) {
			fprintf(stderr, "radclient: Request was \"auto\", but request %d in file %s did not contain Packet-Type\n",
				radclient->packet_number, radclient->filename);
			return -1;
		}

		radclient->request->code = packet_code;
	}
	radclient->request->sockfd = -1;

	return 0;
}


/*
 *	For request handline.
 */
static int filename_cmp(const void *one, const void *two)
{
	return strcmp((const char *) one, (const char *) two);
}

static int filename_walk(void *context, void *data)
{
	const char	*filename = data;

	context = context;	/* -Wunused */

	/*
	 *	Read request(s) from the file.
	 */
	if (!radclient_init(filename)) {
		return 1;	/* stop walking */
	}

	return 0;
}


/*
 *	Deallocate packet ID, etc.
 */
static void deallocate_id(radclient_t *radclient)
{
	if (!radclient || !radclient->request ||
	    (radclient->request->id < 0)) {
		return;
	}

	/*
	 *	One more unused RADIUS ID.
	 */
	fr_packet_list_id_free(pl, radclient->request);
	radclient->request->id = -1;

	/*
	 *	If we've already sent a packet, free up the old one,
	 *	and ensure that the next packet has a unique
	 *	authentication vector.
	 */
	if (radclient->request->data) {
		free(radclient->request->data);
		radclient->request->data = NULL;
	}

	if (radclient->reply) rad_free(&radclient->reply);
}


static void print_hex(RADIUS_PACKET *packet)
{
	int i;

	if (!packet->data) return;

	printf("  Code:\t\t%u\n", packet->data[0]);
	printf("  Id:\t\t%u\n", packet->data[1]);
	printf("  Length:\t%u\n", ((packet->data[2] << 8) |
				   (packet->data[3])));
	printf("  Vector:\t");
	for (i = 4; i < 20; i++) {
		printf("%02x", packet->data[i]);
	}
	printf("\n");

	if (packet->data_len > 20) {
		int total;
		const uint8_t *ptr;
		printf("  Data:");

		total = packet->data_len - 20;
		ptr = packet->data + 20;

		while (total > 0) {
			int attrlen;

			printf("\t\t");
			if (total < 2) { /* too short */
				printf("%02x\n", *ptr);
				break;
			}

			if (ptr[1] > total) { /* too long */
				for (i = 0; i < total; i++) {
					printf("%02x ", ptr[i]);
				}
				break;
			}

			printf("%02x  %02x  ", ptr[0], ptr[1]);
			attrlen = ptr[1] - 2;
			ptr += 2;
			total -= 2;

			for (i = 0; i < attrlen; i++) {
				if ((i > 0) && ((i & 0x0f) == 0x00))
					printf("\t\t\t");
				printf("%02x ", ptr[i]);
				if ((i & 0x0f) == 0x0f) printf("\n");
			}

			if ((attrlen & 0x0f) != 0x00) printf("\n");

			ptr += attrlen;
			total -= attrlen;
		}
	}
	fflush(stdout);
}

/*
 *	Send one packet.
 */
static int send_one_packet(radclient_t *radclient)
{
	assert(radclient->done == 0);

	/*
	 *	Remember when we have to wake up, to re-send the
	 *	request, of we didn't receive a response.
	 */
	if ((sleep_time == -1) ||
	    (sleep_time > (int) timeout)) {
		sleep_time = (int) timeout;
	}

	/*
	 *	Haven't sent the packet yet.  Initialize it.
	 */
	if (radclient->request->id == -1) {
		int i, rcode;

		assert(radclient->reply == NULL);

		/*
		 *	Didn't find a free packet ID, we're not done,
		 *	we don't sleep, and we stop trying to process
		 *	this packet.
		 */
	retry:
		rcode = fr_packet_list_id_alloc(pl, radclient->request);
		if (rcode < 0) {
			int mysockfd;

			mysockfd = fr_socket(&client_ipaddr, 0);
			if (!mysockfd) {
				fprintf(stderr, "radclient: Can't open new socket\n");
				exit(1);
			}
			if (!fr_packet_list_socket_add(pl, mysockfd)) {
				fprintf(stderr, "radclient: Can't add new socket\n");
				exit(1);
			}
			goto retry;
		}

		if (rcode == 0) {
			done = 0;
			sleep_time = 0;
			return 0;
		}

		assert(radclient->request->id != -1);
		assert(radclient->request->data == NULL);

		for (i = 0; i < 4; i++) {
			((uint32_t *) radclient->request->vector)[i] = fr_rand();
		}

		/*
		 *	Update the password, so it can be encrypted with the
		 *	new authentication vector.
		 */
		if (radclient->password[0] != '\0') {
			VALUE_PAIR *vp;

			if ((vp = pairfind(radclient->request->vps, PW_USER_PASSWORD)) != NULL) {
				strlcpy(vp->vp_strvalue, radclient->password,
					sizeof(vp->vp_strvalue));
				vp->length = strlen(vp->vp_strvalue);

			} else if ((vp = pairfind(radclient->request->vps, PW_CHAP_PASSWORD)) != NULL) {
			  /*
			   *	FIXME: AND there's no CHAP-Challenge,
			   *	       AND vp->length != 17
			   *	       AND rad_chap_encode() != vp->vp_octets
			   */
				strlcpy(vp->vp_strvalue, radclient->password,
					sizeof(vp->vp_strvalue));
				vp->length = strlen(vp->vp_strvalue);

				rad_chap_encode(radclient->request,
						vp->vp_octets,
						radclient->request->id, vp);
				vp->length = 17;
			}
		}

		radclient->timestamp = time(NULL);
		radclient->tries = 1;
		radclient->resend++;

		/*
		 *	Duplicate found.  Serious error!
		 */
		if (!fr_packet_list_insert(pl, &radclient->request)) {
			assert(0 == 1);
		}

	} else {		/* radclient->request->id >= 0 */
		time_t now = time(NULL);

		/*
		 *	FIXME: Accounting packets are never retried!
		 *	The Acct-Delay-Time attribute is updated to
		 *	reflect the delay, and the packet is re-sent
		 *	from scratch!
		 */

		/*
		 *	Not time for a retry, do so.
		 */
		if ((now - radclient->timestamp) < timeout) {
			/*
			 *	When we walk over the tree sending
			 *	packets, we update the minimum time
			 *	required to sleep.
			 */
			if ((sleep_time == -1) ||
			    (sleep_time > (now - radclient->timestamp))) {
				sleep_time = now - radclient->timestamp;
			}
			return 0;
		}

		/*
		 *	We're not trying later, maybe the packet is done.
		 */
		if (radclient->tries == retries) {
			assert(radclient->request->id >= 0);

			/*
			 *	Delete the request from the tree of
			 *	outstanding requests.
			 */
			fr_packet_list_yank(pl, radclient->request);

			fprintf(stderr, "radclient: no response from server for ID %d socket %d\n", radclient->request->id, radclient->request->sockfd);
			deallocate_id(radclient);

			/*
			 *	Normally we mark it "done" when we've received
			 *	the response, but this is a special case.
			 */
			if (radclient->resend == resend_count) {
				radclient->done = 1;
			}
			totallost++;
			return -1;
		}

		/*
		 *	We are trying later.
		 */
		radclient->timestamp = now;
		radclient->tries++;
	}


	/*
	 *	Send the packet.
	 */
	if (rad_send(radclient->request, NULL, secret) < 0) {
		fprintf(stderr, "radclient: Failed to send packet for ID %d: %s\n",
			radclient->request->id, fr_strerror());
	}

	if (fr_debug_flag > 2) print_hex(radclient->request);

	return 0;
}

/*
 *	Receive one packet, maybe.
 */
static int recv_one_packet(int wait_time)
{
	fd_set		set;
	struct timeval  tv;
	radclient_t	*radclient;
	RADIUS_PACKET	*reply, **request_p;
	volatile int max_fd;

	/* And wait for reply, timing out as necessary */
	FD_ZERO(&set);

	max_fd = fr_packet_list_fd_set(pl, &set);
	if (max_fd < 0) exit(1); /* no sockets to listen on! */

	if (wait_time <= 0) {
		tv.tv_sec = 0;
	} else {
		tv.tv_sec = wait_time;
	}
	tv.tv_usec = 0;

	/*
	 *	No packet was received.
	 */
	if (select(max_fd, &set, NULL, NULL, &tv) <= 0) {
		return 0;
	}

	/*
	 *	Look for the packet.
	 */
	reply = fr_packet_list_recv(pl, &set);
	if (!reply) {
		fprintf(stderr, "radclient: received bad packet: %s\n",
			fr_strerror());
		return -1;	/* bad packet */
	}

	/*
	 *	udpfromto issues.  We may have bound to "*",
	 *	and we want to find the replies that are sent to
	 *	(say) 127.0.0.1.
	 */
	reply->dst_ipaddr = client_ipaddr;

	if (fr_debug_flag > 2) print_hex(reply);

	request_p = fr_packet_list_find_byreply(pl, reply);
	if (!request_p) {
		fprintf(stderr, "radclient: received response to request we did not send. (id=%d socket %d)\n", reply->id, reply->sockfd);
		rad_free(&reply);
		return -1;	/* got reply to packet we didn't send */
	}
	radclient = fr_packet2myptr(radclient_t, request, request_p);

	/*
	 *	Fails the signature validation: not a real reply.
	 *	FIXME: Silently drop it and listen for another packet.
	 */
	if (rad_verify(reply, radclient->request, secret) < 0) {
		fr_perror("rad_verify");
		totallost++;
		goto packet_done; /* shared secret is incorrect */
	}

	fr_packet_list_yank(pl, radclient->request);
	if (print_filename) printf("%s:%d %d\n",
				   radclient->filename,
				   radclient->packet_number,
				   reply->code);
	deallocate_id(radclient);
	radclient->reply = reply;
	reply = NULL;

	/*
	 *	If this fails, we're out of memory.
	 */
	if (rad_decode(radclient->reply, radclient->request, secret) != 0) {
		fr_perror("rad_decode");
		totallost++;
		goto packet_done;
	}

	/* libradius debug already prints out the value pairs for us */
	if (!fr_debug_flag && do_output) {
		printf("Received response ID %d, code %d, length = %d\n",
		       radclient->reply->id, radclient->reply->code,
		       radclient->reply->data_len);
		vp_printlist(stdout, radclient->reply->vps);
	}

	if ((radclient->reply->code == PW_AUTHENTICATION_ACK) ||
	    (radclient->reply->code == PW_ACCOUNTING_RESPONSE) ||
	    (radclient->reply->code == PW_COA_ACK) ||
	    (radclient->reply->code == PW_DISCONNECT_ACK)) {
		success = 1;		/* have a good response */
		totalapp++;
	} else {
		totaldeny++;
	}
	
	if (radclient->resend == resend_count) {
		radclient->done = 1;
	}

 packet_done:
	rad_free(&radclient->reply);
	rad_free(&reply);	/* may be NULL */

	return 0;
}


static int getport(const char *name)
{
	struct	servent		*svp;

	svp = getservbyname (name, "udp");
	if (!svp) {
		return 0;
	}

	return ntohs(svp->s_port);
}

int main(int argc, char **argv)
{
	char *p;
	int c;
	const char *radius_dir = RADDBDIR;
	char filesecret[256];
	FILE *fp;
	int do_summary = 0;
	int persec = 0;
	int parallel = 1;
	radclient_t	*this;
	int force_af = AF_UNSPEC;

	fr_debug_flag = 0;

	filename_tree = rbtree_create(filename_cmp, NULL, 0);
	if (!filename_tree) {
		fprintf(stderr, "radclient: Out of memory\n");
		exit(1);
	}

	while ((c = getopt(argc, argv, "46c:d:f:Fhi:n:p:qr:sS:t:vx")) != EOF) switch(c) {
		case '4':
			force_af = AF_INET;
			break;
		case '6':
			force_af = AF_INET6;
			break;
		case 'c':
			if (!isdigit((int) *optarg))
				usage();
			resend_count = atoi(optarg);
			break;
		case 'd':
			radius_dir = optarg;
			break;
		case 'f':
			rbtree_insert(filename_tree, optarg);
			break;
		case 'F':
			print_filename = 1;
			break;
		case 'i':	/* currently broken */
			if (!isdigit((int) *optarg))
				usage();
			last_used_id = atoi(optarg);
			if ((last_used_id < 0) || (last_used_id > 255)) {
				usage();
			}
			break;

		case 'n':
			persec = atoi(optarg);
			if (persec <= 0) usage();
			break;

			/*
			 *	Note that sending MANY requests in
			 *	parallel can over-run the kernel
			 *	queues, and Linux will happily discard
			 *	packets.  So even if the server responds,
			 *	the client may not see the response.
			 */
		case 'p':
			parallel = atoi(optarg);
			if (parallel <= 0) usage();
			break;

		case 'q':
			do_output = 0;
			fr_log_fp = NULL; /* no output from you, either! */
			break;
		case 'r':
			if (!isdigit((int) *optarg))
				usage();
			retries = atoi(optarg);
			if ((retries == 0) || (retries > 1000)) usage();
			break;
		case 's':
			do_summary = 1;
			break;
               case 'S':
		       fp = fopen(optarg, "r");
                       if (!fp) {
                               fprintf(stderr, "radclient: Error opening %s: %s\n",
                                       optarg, strerror(errno));
                               exit(1);
                       }
                       if (fgets(filesecret, sizeof(filesecret), fp) == NULL) {
                               fprintf(stderr, "radclient: Error reading %s: %s\n",
                                       optarg, strerror(errno));
                               exit(1);
                       }
		       fclose(fp);

                       /* truncate newline */
		       p = filesecret + strlen(filesecret) - 1;
		       while ((p >= filesecret) &&
			      (*p < ' ')) {
			       *p = '\0';
			       --p;
		       }

                       if (strlen(filesecret) < 2) {
                               fprintf(stderr, "radclient: Secret in %s is too short\n", optarg);
                               exit(1);
                       }
                       secret = filesecret;
		       break;
		case 't':
			if (!isdigit((int) *optarg))
				usage();
			timeout = atof(optarg);
			break;
		case 'v':
			printf("radclient: $Id$ built on " __DATE__ " at " __TIME__ "\n");
			exit(0);
			break;
		case 'x':
			fr_debug_flag++;
			fr_log_fp = stdout;
			break;
		case 'h':
		default:
			usage();
			break;
	}
	argc -= (optind - 1);
	argv += (optind - 1);

	if ((argc < 3)  ||
	    ((secret == NULL) && (argc < 4))) {
		usage();
	}

	if (dict_init(radius_dir, RADIUS_DICTIONARY) < 0) {
		fr_perror("radclient");
		return 1;
	}

	/*
	 *	Resolve hostname.
	 */
	server_ipaddr.af = force_af;
	if (strcmp(argv[1], "-") != 0) {
		const char *hostname = argv[1];
		const char *portname = argv[1];
		char buffer[256];

		if (*argv[1] == '[') { /* IPv6 URL encoded */
			p = strchr(argv[1], ']');
			if ((size_t) (p - argv[1]) >= sizeof(buffer)) {
				usage();
			}

			memcpy(buffer, argv[1] + 1, p - argv[1] - 1);
			buffer[p - argv[1] - 1] = '\0';

			hostname = buffer;
			portname = p + 1;

		}
		p = strchr(portname, ':');
		if (p && (strchr(p + 1, ':') == NULL)) {
			*p = '\0';
			portname = p + 1;
		} else {
			portname = NULL;
		}

		if (ip_hton(hostname, force_af, &server_ipaddr) < 0) {
			fprintf(stderr, "radclient: Failed to find IP address for host %s: %s\n", hostname, strerror(errno));
			exit(1);
		}

		/*
		 *	Strip port from hostname if needed.
		 */
		if (portname) server_port = atoi(portname);
	}

	/*
	 *	See what kind of request we want to send.
	 */
	if (strcmp(argv[2], "auth") == 0) {
		if (server_port == 0) server_port = getport("radius");
		if (server_port == 0) server_port = PW_AUTH_UDP_PORT;
		packet_code = PW_AUTHENTICATION_REQUEST;

	} else if (strcmp(argv[2], "challenge") == 0) {
		if (server_port == 0) server_port = getport("radius");
		if (server_port == 0) server_port = PW_AUTH_UDP_PORT;
		packet_code = PW_ACCESS_CHALLENGE;

	} else if (strcmp(argv[2], "acct") == 0) {
		if (server_port == 0) server_port = getport("radacct");
		if (server_port == 0) server_port = PW_ACCT_UDP_PORT;
		packet_code = PW_ACCOUNTING_REQUEST;
		do_summary = 0;

	} else if (strcmp(argv[2], "status") == 0) {
		if (server_port == 0) server_port = getport("radius");
		if (server_port == 0) server_port = PW_AUTH_UDP_PORT;
		packet_code = PW_STATUS_SERVER;

	} else if (strcmp(argv[2], "disconnect") == 0) {
		if (server_port == 0) server_port = PW_POD_UDP_PORT;
		packet_code = PW_DISCONNECT_REQUEST;

	} else if (strcmp(argv[2], "coa") == 0) {
		if (server_port == 0) server_port = PW_POD_UDP_PORT;
		packet_code = PW_COA_REQUEST;

	} else if (strcmp(argv[2], "auto") == 0) {
		packet_code = -1;

	} else if (isdigit((int) argv[2][0])) {
		if (server_port == 0) server_port = getport("radius");
		if (server_port == 0) server_port = PW_AUTH_UDP_PORT;
		packet_code = atoi(argv[2]);
	} else {
		usage();
	}

	/*
	 *	Add the secret.
	 */
	if (argv[3]) secret = argv[3];

	/*
	 *	If no '-f' is specified, we're reading from stdin.
	 */
	if (rbtree_num_elements(filename_tree) == 0) {
		rbtree_insert(filename_tree, "-");
	}

	/*
	 *	Walk over the list of filenames, creating the requests.
	 */
	if (rbtree_walk(filename_tree, InOrder, filename_walk, NULL) != 0) {
		exit(1);
	}

	/*
	 *	No packets read.  Die.
	 */
	if (!radclient_head) {
		fprintf(stderr, "radclient: Nothing to send.\n");
		exit(1);
	}

	/*
	 *	Bind to the first specified IP address and port.
	 *	This means we ignore later ones.
	 */
	if (radclient_head->request->src_ipaddr.af == AF_UNSPEC) {
		memset(&client_ipaddr, 0, sizeof(client_ipaddr));
		client_ipaddr.af = server_ipaddr.af;
		client_port = 0;
	} else {
		client_ipaddr = radclient_head->request->src_ipaddr;
		client_port = radclient_head->request->src_port;
	}
	sockfd = fr_socket(&client_ipaddr, client_port);
	if (sockfd < 0) {
		fprintf(stderr, "radclient: socket: %s\n", fr_strerror());
		exit(1);
	}

	pl = fr_packet_list_create(1);
	if (!pl) {
		fprintf(stderr, "radclient: Out of memory\n");
		exit(1);
	}

	if (!fr_packet_list_socket_add(pl, sockfd)) {
		fprintf(stderr, "radclient: Out of memory\n");
		exit(1);
	}

	/*
	 *	Walk over the list of packets, sanity checking
	 *	everything.
	 */
	for (this = radclient_head; this != NULL; this = this->next) {
		this->request->src_ipaddr = client_ipaddr;
		this->request->src_port = client_port;
		if (radclient_sane(this) != 0) {
			exit(1);
		}
	}

	/*
	 *	Walk over the packets to send, until
	 *	we're all done.
	 *
	 *	FIXME: This currently busy-loops until it receives
	 *	all of the packets.  It should really have some sort of
	 *	send packet, get time to wait, select for time, etc.
	 *	loop.
	 */
	do {
		int n = parallel;
		radclient_t *next;
		const char *filename = NULL;

		done = 1;
		sleep_time = -1;

		/*
		 *	Walk over the packets, sending them.
		 */

		for (this = radclient_head; this != NULL; this = next) {
			next = this->next;

			/*
			 *	If there's a packet to receive,
			 *	receive it, but don't wait for a
			 *	packet.
			 */
			recv_one_packet(0);

			/*
			 *	This packet is done.  Delete it.
			 */
			if (this->done) {
				radclient_free(this);
				continue;
			}

			/*
			 *	Packets from multiple '-f' are sent
			 *	in parallel.
			 *
			 *	Packets from one file are sent in
			 *	series, unless '-p' is specified, in
			 *	which case N packets from each file
			 *	are sent in parallel.
			 */
			if (this->filename != filename) {
				filename = this->filename;
				n = parallel;
			}

			if (n > 0) {
				n--;

				/*
				 *	Send the current packet.
				 */
				send_one_packet(this);

				/*
				 *	Wait a little before sending
				 *	the next packet, if told to.
				 */
				if (persec) {
					struct timeval tv;

					/*
					 *	Don't sleep elsewhere.
					 */
					sleep_time = 0;

					if (persec == 1) {
						tv.tv_sec = 1;
						tv.tv_usec = 0;
					} else {
						tv.tv_sec = 0;
						tv.tv_usec = 1000000/persec;
					}

					/*
					 *	Sleep for milliseconds,
					 *	portably.
					 *
					 *	If we get an error or
					 *	a signal, treat it like
					 *	a normal timeout.
					 */
					select(0, NULL, NULL, NULL, &tv);
				}

				/*
				 *	If we haven't sent this packet
				 *	often enough, we're not done,
				 *	and we shouldn't sleep.
				 */
				if (this->resend < resend_count) {
					done = 0;
					sleep_time = 0;
				}
			} else { /* haven't sent this packet, we're not done */
				assert(this->done == 0);
				assert(this->reply == NULL);
				done = 0;
			}
		}

		/*
		 *	Still have outstanding requests.
		 */
		if (fr_packet_list_num_elements(pl) > 0) {
			done = 0;
		} else {
			sleep_time = 0;
		}

		/*
		 *	Nothing to do until we receive a request, so
		 *	sleep until then.  Once we receive one packet,
		 *	we go back, and walk through the whole list again,
		 *	sending more packets (if necessary), and updating
		 *	the sleep time.
		 */
		if (!done && (sleep_time > 0)) {
			recv_one_packet(sleep_time);
		}
	} while (!done);

	rbtree_free(filename_tree);
	fr_packet_list_free(pl);
	while (radclient_head) radclient_free(radclient_head);
	dict_free();

	if (do_summary) {
		printf("\n\t   Total approved auths:  %d\n", totalapp);
		printf("\t     Total denied auths:  %d\n", totaldeny);
		printf("\t       Total lost auths:  %d\n", totallost);
	}

	if (success) return 0;

	return 1;
}
