main.c
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main.c
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	/*
	* Copyright (C) 2011 Jiaju Zhang <jjzhang@suse.de>
	*
	* 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 2.1 of the License, or (at your option) any later version.
	*
	* This software 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 library; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <stdio.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <sched.h>
	#include <errno.h>
	#include <limits.h>
	#include <sys/file.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/mman.h>
	#include <sys/time.h>
	#include <sys/resource.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#include <sys/poll.h>
	#include <fcntl.h>
	#include <string.h>
	#include "log.h"
	#include "booth.h"
	#include "config.h"
	#include "transport.h"
	#include "timer.h"
	#include "pacemaker.h"
	#include "ticket.h"

	#define RELEASE_VERSION "1.0"

	#define CLIENT_NALLOC 32

	int log_logfile_priority = LOG_INFO;
	int log_syslog_priority = LOG_ERR;
	int log_stderr_priority = LOG_ERR;

	static int client_maxi;
	static int client_size = 0;
	struct client *client = NULL;
	struct pollfd *pollfd = NULL;

	int poll_timeout = -1;

	typedef enum {
	ACT_ARBITRATOR = 1,
	ACT_SITE,
	ACT_CLIENT,
	} booth_role_t;

	typedef enum {
	OP_LIST = 1,
	OP_GRANT,
	OP_REVOKE,
	} operation_t;

	struct command_line {
	int type; /* ACT_ */
	int op; /* OP_ */
	int debug;
	int force;
	int expiry;
	char site[BOOTH_NAME_LEN];
	char ticket[BOOTH_NAME_LEN];
	};

	static struct command_line cl;

	int do_read(int fd, void *buf, size_t count)
	{
	int rv, off = 0;

	while (off < count) {
	rv = read(fd, (char *)buf + off, count - off);
	if (rv == 0)
	return -1;
	if (rv == -1 && errno == EINTR)
	continue;
	if (rv == -1)
	return -1;
	off += rv;
	}
	return 0;
	}

	int do_write(int fd, void *buf, size_t count)
	{
	int rv, off = 0;

	retry:
	rv = write(fd, (char *)buf + off, count);
	if (rv == -1 && errno == EINTR)
	goto retry;
	if (rv < 0) {
	log_error("write errno %d", errno);
	return rv;
	}

	if (rv != count) {
	count -= rv;
	off += rv;
	goto retry;
	}
	return 0;
	}

	static int do_connect(const char *sock_path)
	{
	struct sockaddr_un sun;
	socklen_t addrlen;
	int rv, fd;

	fd = socket(PF_UNIX, SOCK_STREAM, 0);
	if (fd < 0)
	goto out;

	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_UNIX;
	strcpy(&sun.sun_path[1], sock_path);
	addrlen = sizeof(sa_family_t) + strlen(sun.sun_path+1) + 1;

	rv = connect(fd, (struct sockaddr *) &sun, addrlen);
	if (rv < 0) {
	close(fd);
	fd = rv;
	}
	out:
	return fd;
	}

	static void init_header(struct boothc_header *h, int cmd, int option,
	int expiry, int result, int data_len)
	{
	memset(h, 0, sizeof(struct boothc_header));

	h->magic = BOOTHC_MAGIC;
	h->version = BOOTHC_VERSION;
	h->len = data_len;
	h->cmd = cmd;
	h->option = option;
	h->expiry = expiry;
	h->result = result;
	}

	static void client_alloc(void)
	{
	int i;

	if (!client) {
	client = malloc(CLIENT_NALLOC * sizeof(struct client));
	pollfd = malloc(CLIENT_NALLOC * sizeof(struct pollfd));
	} else {
	client = realloc(client, (client_size + CLIENT_NALLOC) *
	sizeof(struct client));
	pollfd = realloc(pollfd, (client_size + CLIENT_NALLOC) *
	sizeof(struct pollfd));
	if (!pollfd)
	log_error("can't alloc for pollfd");
	}
	if (!client \|\| !pollfd)
	log_error("can't alloc for client array");

	for (i = client_size; i < client_size + CLIENT_NALLOC; i++) {
	client[i].workfn = NULL;
	client[i].deadfn = NULL;
	client[i].fd = -1;
	pollfd[i].fd = -1;
	pollfd[i].revents = 0;
	}
	client_size += CLIENT_NALLOC;
	}

	static void client_dead(int ci)
	{
	close(client[ci].fd);
	client[ci].workfn = NULL;
	client[ci].fd = -1;
	pollfd[ci].fd = -1;
	}

	int client_add(int fd, void (workfn)(int ci), void (deadfn)(int ci))
	{
	int i;

	if (!client)
	client_alloc();
	again:
	for (i = 0; i < client_size; i++) {
	if (client[i].fd == -1) {
	client[i].workfn = workfn;
	if (deadfn)
	client[i].deadfn = deadfn;
	else
	client[i].deadfn = client_dead;
	client[i].fd = fd;
	pollfd[i].fd = fd;
	pollfd[i].events = POLLIN;
	if (i > client_maxi)
	client_maxi = i;
	return i;
	}
	}

	client_alloc();
	goto again;
	}

	static int setup_listener(const char *sock_path)
	{
	struct sockaddr_un addr;
	socklen_t addrlen;
	int rv, s;

	s = socket(AF_LOCAL, SOCK_STREAM, 0);
	if (s < 0) {
	log_error("socket error %d %d", s, errno);
	return s;
	}

	memset(&addr, 0, sizeof(addr));

	addr.sun_family = AF_LOCAL;
	strcpy(&addr.sun_path[1], sock_path);
	addrlen = sizeof(sa_family_t) + strlen(addr.sun_path+1) + 1;

	rv = bind(s, (struct sockaddr *) &addr, addrlen);
	if (rv < 0) {
	log_error("bind error %d %d", rv, errno);
	close(s);
	return rv;
	}

	rv = listen(s, 5);
	if (rv < 0) {
	log_error("listen error %d %d", rv, errno);
	close(s);
	return rv;
	}
	return s;
	}

	void process_connection(int ci)
	{
	struct boothc_header h;
	char *data = NULL;
	char site, ticket;
	int local, rv;

	rv = do_read(client[ci].fd, &h, sizeof(h));
	if (rv < 0) {
	log_error("connection %d read error %d", ci, rv);
	return;
	}
	if (h.magic != BOOTHC_MAGIC) {
	log_error("connection %d magic error %x", ci, h.magic);
	return;
	}
	if (h.version != BOOTHC_VERSION) {
	log_error("connection %d version error %x", ci, h.version);
	return;
	}

	if (h.len) {
	data = malloc(h.len);
	if (!data) {
	log_error("process_connection no mem %u", h.len);
	return;
	}
	memset(data, 0, h.len);

	rv = do_read(client[ci].fd, data, h.len);
	if (rv < 0) {
	log_error("connection %d read data error %d", ci, rv);
	goto out;
	}
	}

	switch (h.cmd) {
	case BOOTHC_CMD_LIST:
	break;

	case BOOTHC_CMD_GRANT:
	site = data;
	ticket = data + BOOTH_NAME_LEN;
	if (!check_ticket(ticket)) {
	h.result = BOOTHC_RLT_INVALID_ARG;
	goto reply;
	}
	if (!check_site(site, &local)) {
	h.result = BOOTHC_RLT_INVALID_ARG;
	goto reply;
	}
	if (local)
	h.result = grant_ticket(ticket, h.option, h.expiry);
	else
	h.result = BOOTHC_RLT_REMOTE_OP;
	break;

	case BOOTHC_CMD_REVOKE:
	break;

	default:
	log_error("connection %d cmd %x unknown", ci, h.cmd);
	break;
	}

	reply:
	rv = do_write(client[ci].fd, &h, sizeof(h));
	if (rv < 0)
	log_error("connection %d write error %d", ci, rv);
	out:
	free(data);
	}

	static void process_listener(int ci)
	{
	int fd, i;

	fd = accept(client[ci].fd, NULL, NULL);
	if (fd < 0) {
	log_error("process_listener: accept error %d %d", fd, errno);
	return;
	}

	i = client_add(fd, process_connection, NULL);

	log_debug("client connection %d fd %d", i, fd);
	}

	static int setup_config(int type)
	{
	int rv;

	rv = read_config(BOOTH_DEFAULT_CONF);
	if (rv < 0)
	goto out;

	rv = check_config(type);
	if (rv < 0)
	goto out;

	out:
	return rv;
	}

	static int setup_transport(void)
	{
	int rv;

	rv = booth_transport[booth_conf->proto].init(ticket_recv);
	if (rv < 0)
	goto out;

	rv = booth_transport[TCP].init(NULL);
	if (rv < 0)
	goto out;

	out:
	return rv;
	}

	static int setup_timer(void)
	{
	return timerlist_init();
	}

	static void loop(int type)
	{
	void (*workfn) (int ci);
	void (*deadfn) (int ci);
	int rv, i;

	rv = setup_config(type);
	if (rv < 0)
	goto out;

	rv = setup_timer();
	if (rv < 0)
	goto out;

	rv = setup_transport();
	if (rv < 0)
	goto out;

	rv = setup_ticket();
	if (rv < 0)
	goto out;

	rv = setup_listener(BOOTHC_SOCK_PATH);
	if (rv < 0)
	goto out;
	client_add(rv, process_listener, NULL);

	while (1) {
	rv = poll(pollfd, client_maxi + 1, poll_timeout);
	if (rv == -1 && errno == EINTR)
	continue;
	if (rv < 0) {
	log_error("poll errno %d", errno);
	goto out;
	}

	for (i = 0; i <= client_maxi; i++) {
	if (client[i].fd < 0)
	continue;
	if (pollfd[i].revents & POLLIN) {
	workfn = client[i].workfn;
	if (workfn)
	workfn(i);
	}
	if (pollfd[i].revents &
	(POLLERR \| POLLHUP \| POLLNVAL)) {
	deadfn = client[i].deadfn;
	if (deadfn)
	deadfn(i);
	}
	}

	process_timerlist();
	}

	out:
	return;
	}

	static int do_list(void)
	{
	struct boothc_header h, *rh;
	char reply = NULL, data;
	int data_len;
	int fd, rv;

	init_header(&h, BOOTHC_CMD_LIST, 0, 0, 0, 0);

	fd = do_connect(BOOTHC_SOCK_PATH);
	if (fd < 0) {
	rv = fd;
	goto out;
	}

	rv = do_write(fd, &h, sizeof(h));
	if (rv < 0)
	goto out_close;

	reply = malloc(sizeof(struct boothc_header));
	if (!reply) {
	rv = -ENOMEM;
	goto out_close;
	}

	rv = do_read(fd, reply, sizeof(struct boothc_header));
	if (rv < 0)
	goto out_free;

	rh = (struct boothc_header *)reply;
	data_len = rh->len;

	reply = realloc(reply, sizeof(struct boothc_header) + data_len);
	if (!reply) {
	rv = -ENOMEM;
	goto out_free;
	}
	data = reply + sizeof(struct boothc_header);
	rv = do_read(fd, data, data_len);
	if (rv < 0)
	goto out_free;

	do_write(STDOUT_FILENO, data, data_len);
	rv = 0;

	out_free:
	free(reply);
	out_close:
	close(fd);
	out:
	return rv;
	}

	static int do_grant(void)
	{
	char *buf;
	struct boothc_header *h, reply;
	int buflen;
	uint32_t force = 0;
	int fd, rv;

	buflen = sizeof(struct boothc_header) +
	sizeof(cl.site) + sizeof(cl.ticket);
	buf = malloc(buflen);
	if (!buf) {
	rv = -ENOMEM;
	goto out;
	}
	h = (struct boothc_header *)buf;
	if (cl.force)
	force = BOOTHC_OPT_FORCE;
	init_header(h, BOOTHC_CMD_GRANT, force, cl.expiry, 0,
	sizeof(cl.site) + sizeof(cl.ticket));
	strcpy(buf + sizeof(struct boothc_header), cl.site);
	strcpy(buf + sizeof(struct boothc_header) + sizeof(cl.site), cl.ticket);

	fd = do_connect(BOOTHC_SOCK_PATH);
	if (fd < 0) {
	rv = fd;
	goto out_free;
	}

	rv = do_write(fd, buf, buflen);
	if (rv < 0)
	goto out_close;

	rv = do_read(fd, &reply, sizeof(struct boothc_header));
	if (rv < 0)
	goto out_close;

	if (reply.result == BOOTHC_RLT_INVALID_ARG) {
	log_info("invalid argument!");
	rv = -1;
	goto out_close;
	}

	if (reply.result == BOOTHC_RLT_REMOTE_OP) {
	struct booth_node to;
	int s;

	memset(&to, 0, sizeof(struct booth_node));
	to.family = BOOTH_PROTO_FAMILY;
	strcpy(to.addr, cl.site);

	s = booth_transport[TCP].open(&to);
	if (s < 0)
	goto out_close;

	rv = booth_transport[TCP].send(s, buf, buflen);
	if (rv < 0) {
	booth_transport[TCP].close(s);
	goto out_close;
	}
	rv = booth_transport[TCP].recv(s, &reply,
	sizeof(struct boothc_header));
	if (rv < 0) {
	booth_transport[TCP].close(s);
	goto out_close;
	}
	booth_transport[TCP].close(s);
	}

	if (reply.result == BOOTHC_RLT_ASYNC) {
	log_info("grant command sent, but result is async.");
	rv = 0;
	} else if (reply.result == BOOTHC_RLT_SYNC_SUCC) {
	log_info("grant succeeded!");
	rv = 0;
	} else if (reply.result == BOOTHC_RLT_SYNC_FAIL) {
	log_info("grant failed!");
	rv = 0;
	} else {
	log_error("internal error!");
	rv = -1;
	}

	out_close:
	close(fd);
	out_free:
	free(buf);
	out:
	return rv;
	}

	static int do_revoke(void)
	{
	char *buf;
	struct boothc_header *h, reply;
	int buflen;
	int fd, rv;

	buflen = sizeof(struct boothc_header) + sizeof(cl.ticket);
	buf = malloc(buflen);
	if (!buf) {
	rv = -ENOMEM;
	goto out;
	}
	h = (struct boothc_header *)buf;
	init_header(h, BOOTHC_CMD_REVOKE, 0, 0, 0, sizeof(cl.ticket));
	strcpy(buf + sizeof(struct boothc_header), cl.ticket);

	fd = do_connect(BOOTHC_SOCK_PATH);
	if (fd < 0) {
	rv = fd;
	goto out_free;
	}

	rv = do_write(fd, buf, buflen);
	if (rv < 0)
	goto out_close;

	rv = do_read(fd, &reply, sizeof(struct boothc_header));
	if (rv < 0)
	goto out_close;
	if (reply.result == BOOTHC_RLT_ASYNC) {
	log_info("revoke command sent, but result is async.");
	rv = 0;
	} else if (reply.result == BOOTHC_RLT_SYNC_SUCC) {
	log_info("revoke succeeded!");
	rv = 0;
	} else if (reply.result == BOOTHC_RLT_SYNC_FAIL) {
	log_info("revoke failed!");
	rv = 0;
	} else {
	log_error("internal error!");
	rv = -1;
	}

	out_close:
	close(fd);
	out_free:
	free(buf);
	out:
	return rv;
	}

	static int lockfile(void)
	{
	char path[PATH_MAX];
	char buf[16];
	struct flock lock;
	int fd, rv;

	snprintf(path, PATH_MAX, "%s/%s", BOOTH_RUN_DIR, BOOTH_LOCKFILE_NAME);

	fd = open(path, O_CREAT\|O_WRONLY, 0666);
	if (fd < 0) {
	log_error("lockfile open error %s: %s",
	path, strerror(errno));
	return -1;
	}

	lock.l_type = F_WRLCK;
	lock.l_start = 0;
	lock.l_whence = SEEK_SET;
	lock.l_len = 0;

	rv = fcntl(fd, F_SETLK, &lock);
	if (rv < 0) {
	log_error("lockfile setlk error %s: %s",
	path, strerror(errno));
	goto fail;
	}

	rv = ftruncate(fd, 0);
	if (rv < 0) {
	log_error("lockfile truncate error %s: %s",
	path, strerror(errno));
	goto fail;
	}

	memset(buf, 0, sizeof(buf));
	snprintf(buf, sizeof(buf), "%d\n", getpid());

	rv = write(fd, buf, strlen(buf));
	if (rv <= 0) {
	log_error("lockfile write error %s: %s",
	path, strerror(errno));
	goto fail;
	}

	return fd;
	fail:
	close(fd);
	return -1;
	}

	static void unlink_lockfile(int fd)
	{
	char path[PATH_MAX];

	snprintf(path, PATH_MAX, "%s/%s", BOOTH_RUN_DIR, BOOTH_LOCKFILE_NAME);
	unlink(path);
	close(fd);
	}

	static void print_usage(void)
	{
	printf("Usage:\n");
	printf("booth <type> <operation> [options]\n");
	printf("\n");
	printf("Types:\n");
	printf(" arbitrator: daemon running on arbitrator\n");
	printf(" site: daemon running on cluster site\n");
	printf(" client: command running from client\n");
	printf("\n");
	printf("Operations:\n");
	printf("Please note that operations are valid iff type is client!\n");
	printf("list: List all the tickets\n");
	printf("grant: Grant ticket T(-t T) to site S(-s S)\n");
	printf("revoke: Revoke ticket T(-t T) from local site\n");
	printf("\n");
	printf("Options:\n");
	printf(" -D Enable debugging to stderr and don't fork\n");
	printf(" -t ticket name\n");
	printf(" -s site name\n");
	printf(" -f ticket attribute: force, only valid when "
	"granting\n");
	printf(" -e ticket will failover after the expiry time if "
	"not being renewed,\n\t\tset it while "
	"granting. default: 600sec\n");
	printf(" -h Print this help, then exit\n");
	}

	#define OPTION_STRING "Dt:s:fe:h"

	static int read_arguments(int argc, char **argv)
	{
	int optchar;
	char *arg1 = argv[1];
	char *op;

	if (argc < 2 \|\| !strcmp(arg1, "help") \|\| !strcmp(arg1, "--help") \|\|
	!strcmp(arg1, "-h")) {
	print_usage();
	exit(EXIT_SUCCESS);
	}

	if (!strcmp(arg1, "version") \|\| !strcmp(arg1, "--version") \|\|
	!strcmp(arg1, "-V")) {
	printf("%s %s (built %s %s)\n",
	argv[0], RELEASE_VERSION, __DATE__, __TIME__);
	exit(EXIT_SUCCESS);
	}

	if (!strcmp(arg1, "arbitrator")) {
	cl.type = ACT_ARBITRATOR;
	optind = 2;
	} else if (!strcmp(arg1, "site")) {
	cl.type = ACT_SITE;
	optind = 2;
	} else if (!strcmp(arg1, "client")) {
	cl.type = ACT_CLIENT;
	if (argc < 3) {
	print_usage();
	exit(EXIT_FAILURE);
	}
	op = argv[2];
	optind = 3;
	} else {
	cl.type = ACT_CLIENT;
	op = argv[1];
	optind = 2;
	}

	switch (cl.type) {
	case ACT_ARBITRATOR:
	break;

	case ACT_SITE:
	break;

	case ACT_CLIENT:
	if (!strcmp(op, "list"))
	cl.op = OP_LIST;
	else if (!strcmp(op, "grant"))
	cl.op = OP_GRANT;
	else if (!strcmp(op, "revoke"))
	cl.op = OP_REVOKE;
	else {
	fprintf(stderr, "client operation \"%s\" is unknown\n",
	op);
	exit(EXIT_FAILURE);
	}
	break;
	}

	while (optind < argc) {
	optchar = getopt(argc, argv, OPTION_STRING);

	switch (optchar) {
	case 'D':
	cl.debug = 1;
	log_logfile_priority = LOG_DEBUG;
	log_syslog_priority = LOG_DEBUG;
	break;

	case 't':
	if (cl.op == OP_GRANT \|\| cl.op == OP_REVOKE)
	strcpy(cl.ticket, optarg);
	else {
	print_usage();
	exit(EXIT_FAILURE);
	}
	break;

	case 's':
	if (cl.op == OP_GRANT \|\| cl.op == OP_REVOKE)
	strcpy(cl.site, optarg);
	else {
	print_usage();
	exit(EXIT_FAILURE);
	}
	break;

	case 'f':
	if (cl.op == OP_GRANT)
	cl.force = 1;
	else {
	print_usage();
	exit(EXIT_FAILURE);
	}
	break;

	case 'e':
	if (cl.op == OP_GRANT)
	cl.expiry = atoi(optarg);
	else {
	print_usage();
	exit(EXIT_FAILURE);
	}
	break;

	case 'h':
	print_usage();
	exit(EXIT_SUCCESS);
	break;

	case ':':
	case '?':
	fprintf(stderr, "Please use '-h' for usage.\n");
	exit(EXIT_FAILURE);
	break;

	default:
	fprintf(stderr, "unknown option: %c\n", optchar);
	exit(EXIT_FAILURE);
	break;
	};
	}

	return 0;
	}

	static void set_scheduler(void)
	{
	struct sched_param sched_param;
	struct rlimit rlimit;
	int rv;

	rlimit.rlim_cur = RLIM_INFINITY;
	rlimit.rlim_max = RLIM_INFINITY;
	setrlimit(RLIMIT_MEMLOCK, &rlimit);
	rv = mlockall(MCL_CURRENT \| MCL_FUTURE);
	if (rv < 0) {
	log_error("mlockall failed");
	}

	rv = sched_get_priority_max(SCHED_RR);
	if (rv != -1) {
	sched_param.sched_priority = rv;
	rv = sched_setscheduler(0, SCHED_RR, &sched_param);
	if (rv == -1)
	log_error("could not set SCHED_RR priority %d err %d",
	sched_param.sched_priority, errno);
	} else {
	log_error("could not get maximum scheduler priority err %d",
	errno);
	}
	}

	static void set_oom_adj(int val)
	{
	FILE *fp;

	fp = fopen("/proc/self/oom_adj", "w");
	if (!fp)
	return;

	fprintf(fp, "%i", val);
	fclose(fp);
	}

	static int do_arbitrator(void)
	{
	int fd;

	if (!cl.debug) {
	if (daemon(0, 0) < 0) {
	perror("daemon error");
	exit(EXIT_FAILURE);
	}
	}

	setup_logging();
	fd = lockfile();
	if (fd < 0)
	return fd;

	log_info("BOOTH arbitrator daemon started");
	set_scheduler();
	set_oom_adj(-16);

	loop(ARBITRATOR);

	unlink_lockfile(fd);
	close_logging();

	return 0;
	}

	static int do_site(void)
	{
	int fd;

	if (!cl.debug) {
	if (daemon(0, 0) < 0) {
	perror("daemon error");
	exit(EXIT_FAILURE);
	}
	}

	setup_logging();
	fd = lockfile();
	if (fd < 0)
	return fd;

	log_info("BOOTH cluster site daemon started");
	set_scheduler();
	set_oom_adj(-16);

	loop(SITE);

	unlink_lockfile(fd);
	close_logging();

	return 0;
	}

	static int do_client(void)
	{
	int rv = -1;

	setup_logging();

	switch (cl.op) {
	case OP_LIST:
	rv = do_list();
	break;

	case OP_GRANT:
	rv = do_grant();
	break;

	case OP_REVOKE:
	rv = do_revoke();
	break;
	}

	close_logging();

	return rv;
	}

	int main(int argc, char *argv[])
	{
	int rv;

	memset(&cl, 0, sizeof(cl));

	rv = read_arguments(argc, argv);
	if (rv < 0)
	goto out;

	switch (cl.type) {
	case ACT_ARBITRATOR:
	rv = do_arbitrator();
	break;

	case ACT_SITE:
	rv = do_site();
	break;

	case ACT_CLIENT:
	rv = do_client();
	break;
	}

	out:
	return rv;
	}

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