tmcc.c 6.14 KB
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#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <errno.h>
#include <syslog.h>
#include <unistd.h>
#include <signal.h>
#include <stdarg.h>
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#include <stdlib.h>
#include <string.h>
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#include <sys/time.h>
#include <time.h>
#include <assert.h>
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#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
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#include "decls.h"
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#include "config.h"
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#undef BOSSNODE
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#ifdef BOSSNODE
#define DEFAULT_BOSSNODE BOSSNODE
#else
#define DEFAULT_BOSSNODE NULL
#endif
#define BOSSNODEFILE	 "/usr/local/etc/bossnode"
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void		sigcatcher(int foo);
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char		*getbossnode(void);
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#ifdef UDP
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void		doudp(int, char **, int, struct in_addr, int);
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#endif

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char *usagestr = 
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 "usage: tmcc [-u] [-v versnum] [-p #] [-s server] <command>\n"
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 " -s server	   Specify a tmcd server to connect to\n"
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 " -p portnum	   Specify a port number to connect to\n"
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 " -v versnum	   Specify a version number for tmcd\n"
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 " -u		   Use UDP instead of TCP\n"
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 "\n";

void
usage()
{
	fprintf(stderr, usagestr);
	exit(1);
}


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int
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main(int argc, char **argv)
{
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	int			sock, data, n, cc, ch, portnum;
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	struct sockaddr_in	name;
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	struct hostent		*he;
	struct in_addr		serverip;
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	char			buf[MYBUFSIZE], *bp, *response = "";
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	char			*bossnode = DEFAULT_BOSSNODE;
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	int			version = CURRENT_VERSION;
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#ifdef UDP
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	int			useudp = 0;
#endif
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	portnum = TBSERVER_PORT;

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	while ((ch = getopt(argc, argv, "v:s:p:u")) != -1)
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		switch(ch) {
		case 'p':
			portnum = atoi(optarg);
			break;
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		case 's':
			bossnode = optarg;
			break;
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		case 'v':
			version = atoi(optarg);
			break;
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#ifdef UDP
		case 'u':
			useudp = 1;
			break;
#endif
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		default:
			usage();
		}

	argc -= optind;
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	if (argc < 1 || argc > 3) {
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		usage();
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	}
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	argv += optind;
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	/*
	 * How do we find our bossnode?
	 *
	 * 1. Command line.
	 * 2. Compiled in.
	 * 3. /usr/local/etc/bossnode
	 * 4. nameserver goo below.
	 */
	if (!bossnode) {
		FILE	*fp;
		
		if ((fp = fopen(BOSSNODEFILE, "r")) != NULL) {
			if (fgets(buf, sizeof(buf), fp)) {
				if ((bp = strchr(buf, '\n')))
					*bp = (char) NULL;
				bossnode = strdup(buf);
			}
			fclose(fp);
		}
	}
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	if (!bossnode)
		bossnode = getbossnode();
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	he = gethostbyname(bossnode);
	if (he)
		memcpy((char *)&serverip, he->h_addr, he->h_length);
	else {
		fprintf(stderr, "gethostbyname(%s) failed\n", bossnode); 
		exit(1);
	}

	/*
	 * Handle built-in "bossinfo" command
	 */
	if (strcmp(argv[0], "bossinfo") == 0) {
		printf("%s %s\n", bossnode, inet_ntoa(serverip));
		exit(0);
	}

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#ifdef UDP
	if (useudp) {
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		doudp(argc, argv, version, serverip, portnum);
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		/*
		 * Never returns.
		 */
		abort();
	}
#endif

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	while (1) {
		/* Create socket from which to read. */
		sock = socket(AF_INET, SOCK_STREAM, 0);
		if (sock < 0) {
			perror("creating stream socket:");
			exit(1);
		}

		/* Create name. */
		name.sin_family = AF_INET;
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		name.sin_addr   = serverip;
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		name.sin_port = htons(portnum);
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		if (connect(sock,
			    (struct sockaddr *) &name, sizeof(name)) == 0) {
			break;
		}
		if (errno == ECONNREFUSED) {
			fprintf(stderr, "Connection to TMCD refused "
				"Sleeping a little while ...\n");
			sleep(10);
		}
		else {
			perror("connecting stream socket");
			exit(1);
		}
		close(sock);
	}

	data = 1;
	if (setsockopt(sock, SOL_SOCKET,
		       SO_KEEPALIVE, &data, sizeof(data)) < 0) {
		perror("setsockopt SO_KEEPALIVE");
		close(sock);
		exit(1);
	}
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	/* Start with version number */
	sprintf(buf, "VERSION=%d ", version);

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	/*
	 * Since we've gone through a getopt() pass, argv[0] is now the
	 * first argument
	 */
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	n = strlen(buf);
	while (argc && n < sizeof(buf)) {
		n += snprintf(&buf[n], sizeof(buf) - n, "%s ", argv[0]);
		argc--;
		argv++;
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	}
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	if (n >= sizeof(buf)) {
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		fprintf(stderr, "Command too large!\n");
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		exit(1);
	}

	/*
	 * Write the command to the socket and wait for the response
	 */
	bp = buf;
	while (n) {
		if ((cc = write(sock, bp, n)) <= 0) {
			if (cc < 0) {
				perror("Writing to socket:");
				exit(1);
			}
			fprintf(stderr, "write aborted");
			exit(1);
		}
		bp += cc;
		n  -= cc;
	}

	while (1) {
		if ((cc = read(sock, buf, sizeof(buf))) <= 0) {
			if (cc < 0) {
				perror("Reading from socket:");
				exit(1);
			}
			break;
		}
		buf[cc] = '\0';
		bp = (char *) malloc(strlen(response) + cc + 1);
		assert(bp);
		strcpy(bp, response);
		strcat(bp, buf);
		response = bp;
	}
	printf("%s", response);

	close(sock);
	exit(0);
}

void
sigcatcher(int foo)
{
}

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#ifndef BOSSNODE
#include <resolv.h>
#endif

char *
getbossnode(void)
{
#ifdef BOSSNODE
	return strdup(BOSSNODE);
#else
	struct hostent *he;

	res_init();
	he = gethostbyaddr((char *)&_res.nsaddr.sin_addr,
			   sizeof(struct in_addr), AF_INET);
	if (he && he->h_name)
		return strdup(he->h_name);
	return("UNKNOWN");
#endif
}

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#ifdef UDP
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/*
 * Not very robust, send a single request, read a single reply. 
 */
void
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doudp(int argc, char **argv, int vers, struct in_addr serverip, int portnum)
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{
	int			sock, length, n, cc;
	struct sockaddr_in	name, client;
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	char			buf[MYBUFSIZE], *bp, *response = "";
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	/* Create socket from which to read. */
	sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (sock < 0) {
		perror("creating dgram socket:");
		exit(1);
	}

	/* Create name. */
	name.sin_family = AF_INET;
	name.sin_addr   = serverip;
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	name.sin_port = htons(portnum);
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	sprintf(buf, "VERSION=%d ", vers);

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	/*
	 * Since we've gone through a getopt() pass, argv[0] is now the
	 * first argument
	 */
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	n = strlen(buf);
	while (argc && n < sizeof(buf)) {
		n += snprintf(&buf[n], sizeof(buf) - n, "%s ", argv[0]);
		argc--;
		argv++;
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	}
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	if (n >= sizeof(buf)) {
		fprintf(stderr, "Command too large!\n");
		exit(1);
	}

	/*
	 * Write the command to the socket and wait for the response
	 */
	cc = sendto(sock, buf, n, 0, (struct sockaddr *)&name, sizeof(name));
	if (cc != n) {
		if (cc < 0) {
			perror("Writing to socket:");
			exit(1);
		}
		fprintf(stderr, "short write (%d != %d)\n", cc, n);
		exit(1);
	}

	cc = recvfrom(sock, buf, sizeof(buf), 0,
		      (struct sockaddr *)&client, &length);
	if (cc < 0) {
		perror("Reading from socket:");
		exit(1);
	}
	buf[cc] = '\0';
	bp = (char *) malloc(strlen(response) + cc + 1);
	assert(bp);
	strcpy(bp, response);
	strcat(bp, buf);
	response = bp;
	printf("%s", response);

	close(sock);
	exit(0);
}
#endif