[ashd.git] / src / accesslog.c

/*
    ashd - A Sane HTTP Daemon
    Copyright (C) 2008  Fredrik Tolf <fredrik@dolda2000.com>

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/poll.h>
#include <time.h>
#include <sys/time.h>
#include <signal.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/socket.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <utils.h>
#include <log.h>
#include <req.h>
#include <proc.h>
#include <mt.h>
#include <mtio.h>
#include <bufio.h>

#define DEFFORMAT "%{%Y-%m-%d %H:%M:%S}t %m %u %A \"%G\""

static struct logdata {
    struct hthead *req, *resp;
    struct timeval start, end;
    off_t bytesin, bytesout;
} defdata = {
    .bytesin = -1,
    .bytesout = -1,
};

static int ch, filter;
static char *outname = NULL;
static FILE *out;
static int flush = 1, locklog = 1;
static char *format;
static volatile int reopen = 0;

static void qputs(char *sp, FILE *o)
{
    unsigned char *s = (unsigned char *)sp;
    
    for(; *s; s++) {
	if(*s == '\"') {
	    fputs("\\\"", o);
	} else if(*s == '\\') {
	    fputs("\\\\", o);
	} else if(*s == '\n') {
	    fputs("\\n", o);
	} else if(*s == '\t') {
	    fputs("\\t", o);
	} else if((*s < 32) || (*s >= 128)) {
	    fprintf(o, "\\x%02x", (int)*s);
	} else {
	    fputc(*s, o);
	}
    }
}

static void logitem(struct logdata *data, char o, char *d)
{
    char *h, *p;
    char buf[1024];
    
    switch(o) {
    case '%':
	putc('%', out);
	break;
    case 'h':
	if((h = getheader(data->req, d)) == NULL) {
	    putc('-', out);
	} else {
	    qputs(h, out);
	}
	break;
    case 'u':
	qputs(data->req->url, out);
	break;
    case 'U':
	strncpy(buf, data->req->url, sizeof(buf));
	buf[sizeof(buf) - 1] = 0;
	if((p = strchr(buf, '?')) != NULL)
	    *p = 0;
	qputs(buf, out);
	break;
    case 'm':
	qputs(data->req->method, out);
	break;
    case 'r':
	qputs(data->req->rest, out);
	break;
    case 'v':
	qputs(data->req->ver, out);
	break;
    case 't':
	if(!*d)
	    d = "%a, %d %b %Y %H:%M:%S %z";
	strftime(buf, sizeof(buf), d, localtime(&data->start.tv_sec));
	qputs(buf, out);
	break;
    case 'T':
	if(!*d)
	    d = "%a, %d %b %Y %H:%M:%S %z";
	strftime(buf, sizeof(buf), d, gmtime(&data->start.tv_sec));
	qputs(buf, out);
	break;
    case 's':
	fprintf(out, "%06i", (int)data->start.tv_usec);
	break;
    case 'c':
	if(!data->resp)
	    putc('-', out);
	else
	    fprintf(out, "%i", data->resp->code);
	break;
    case 'i':
	if(data->bytesin < 0)
	    putc('-', out);
	else
	    fprintf(out, "%ji", (intmax_t)data->bytesin);
	break;
    case 'o':
	if(data->bytesout < 0)
	    putc('-', out);
	else
	    fprintf(out, "%ji", (intmax_t)data->bytesout);
	break;
    case 'd':
	if((data->end.tv_sec == 0) && (data->end.tv_usec == 0))
	    fputc('-', out);
	else
	    fprintf(out, "%.6f", (data->end.tv_sec - data->start.tv_sec) + ((data->end.tv_usec - data->start.tv_usec) / 1000000.0));
	break;
    case 'A':
	logitem(data, 'h', "X-Ash-Address");
	break;
    case 'H':
	logitem(data, 'h', "Host");
	break;
    case 'R':
	logitem(data, 'h', "Referer");
	break;
    case 'G':
	logitem(data, 'h', "User-Agent");
	break;
    }
}

static void logreq(struct logdata *data)
{
    char *p, *p2;
    char d[strlen(format)];
    char o;
    
    p = format;
    while(*p) {
	if(*p == '%') {
	    p++;
	    if(*p == '{') {
		p++;
		if((p2 = strchr(p, '}')) == NULL)
		    continue;
		memcpy(d, p, p2 - p);
		d[p2 - p] = 0;
		p = p2 + 1;
	    } else {
		d[0] = 0;
	    }
	    o = *p++;
	    if(o == 0)
		break;
	    logitem(data, o, d);
	} else {
	    fputc(*p++, out);
	}
    }
    fputc('\n', out);
    if(flush)
	fflush(out);
}

static void serve(struct hthead *req, int fd)
{
    struct logdata data;
    
    data = defdata;
    data.req = req;
    gettimeofday(&data.start, NULL);
    if(sendreq(ch, req, fd)) {
	flog(LOG_ERR, "accesslog: could not pass request to child: %s", strerror(errno));
	exit(1);
    }
    logreq(&data);
}

static int passdata(struct bufio *in, struct bufio *out, off_t *passed)
{
    ssize_t read;
    off_t total;
    
    total = 0;
    while(!bioeof(in)) {
	if((read = biordata(in)) > 0) {
	    if((read = biowritesome(out, in->rbuf.b + in->rh, read)) < 0)
		return(-1);
	    in->rh += read;
	    total += read;
	}
	if(biorspace(in) && (biofillsome(in) < 0))
	    return(-1);
    }
    if(passed)
	*passed = total;
    return(0);
}

static void filterreq(struct muth *mt, va_list args)
{
    vavar(struct hthead *, req);
    vavar(int, fd);
    int pfds[2];
    struct hthead *resp;
    struct bufio *cl, *hd;
    struct logdata data;
    
    hd = NULL;
    resp = NULL;
    data = defdata;
    data.req = req;
    gettimeofday(&data.start, NULL);
    cl = mtbioopen(fd, 1, 600, "r+", NULL);
    if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
	goto out;
    hd = mtbioopen(pfds[1], 1, 600, "r+", NULL);
    if(sendreq(ch, req, pfds[0])) {
	close(pfds[0]);
	goto out;
    }
    close(pfds[0]);
    
    if(passdata(cl, hd, &data.bytesin))
	goto out;
    if(bioflush(hd))
	goto out;
    shutdown(pfds[1], SHUT_WR);
    if((resp = parseresponseb(hd)) == NULL)
	goto out;
    data.resp = resp;
    writerespb(cl, resp);
    bioprintf(cl, "\r\n");
    if(passdata(hd, cl, &data.bytesout))
	goto out;
    gettimeofday(&data.end, NULL);
    
out:
    logreq(&data);
    
    freehthead(req);
    if(resp != NULL)
	freehthead(resp);
    bioclose(cl);
    if(hd != NULL)
	bioclose(hd);
}

static void sighandler(int sig)
{
    if(sig == SIGHUP) {
	if(filter)
	    exitioloop(2);
	else
	    reopen = 1;
    }
}

static int lockfile(FILE *file)
{
    struct flock ld;
    
    memset(&ld, 0, sizeof(ld));
    ld.l_type = F_WRLCK;
    ld.l_whence = SEEK_SET;
    ld.l_start = 0;
    ld.l_len = 0;
    return(fcntl(fileno(file), F_SETLK, &ld));
}

static void fetchpid(char *filename)
{
    int fd, ret;
    struct flock ld;
    
    if((fd = open(filename, O_WRONLY)) < 0) {
	fprintf(stderr, "accesslog: %s: %s\n", filename, strerror(errno));
	exit(1);
    }
    memset(&ld, 0, sizeof(ld));
    ld.l_type = F_WRLCK;
    ld.l_whence = SEEK_SET;
    ld.l_start = 0;
    ld.l_len = 0;
    ret = fcntl(fd, F_GETLK, &ld);
    close(fd);
    if(ret) {
	fprintf(stderr, "accesslog: %s: %s\n", filename, strerror(errno));
	exit(1);
    }
    if(ld.l_type == F_UNLCK) {
	fprintf(stderr, "accesslog: %s: not locked\n", filename);
	exit(1);
    }
    printf("%i\n", (int)ld.l_pid);
}

static void reopenlog(void)
{
    FILE *new;
    struct stat olds, news;
    
    if(outname == NULL) {
	flog(LOG_WARNING, "accesslog: received SIGHUP but logging to stdout, so ignoring");
	return;
    }
    if(locklog) {
	if(fstat(fileno(out), &olds)) {
	    flog(LOG_ERR, "accesslog: could not stat current logfile(?!): %s", strerror(errno));
	    return;
	}
	if(!stat(outname, &news)) {
	    if((olds.st_dev == news.st_dev) && (olds.st_ino == news.st_ino)) {
		/*
		 * This needs to be ignored, because if the same logfile
		 * is opened and then closed, the lock is lost. To quote
		 * the Linux fcntl(2) manpage: "This is bad." No kidding.
		 *
		 * Technically, there is a race condition here when the
		 * file has been stat'ed but not yet opened, where the old
		 * log file, having been previously renamed, changes name
		 * back to the name accesslog knows and is thus reopened
		 * regardlessly, but I think that might fit under the
		 * idiom "pathological case". It should, at least, not be
		 * a security problem.
		 */
		flog(LOG_INFO, "accesslog: received SIGHUP, but logfile has not changed, so ignoring");
		return;
	    }
	}
    }
    if((new = fopen(outname, "a")) == NULL) {
	flog(LOG_WARNING, "accesslog: could not reopen log file `%s' on SIGHUP: %s", outname, strerror(errno));
	return;
    }
    fcntl(fileno(new), F_SETFD, FD_CLOEXEC);
    if(locklog) {
	if(lockfile(new)) {
	    if((errno == EAGAIN) || (errno == EACCES)) {
		flog(LOG_ERR, "accesslog: logfile is already locked; reverting to current log", strerror(errno));
		fclose(new);
		return;
	    } else {
		flog(LOG_WARNING, "accesslog: could not lock logfile, so no lock will be held: %s", strerror(errno));
	    }
	}
    }
    fclose(out);
    out = new;
}

static void listenloop(struct muth *mt, va_list args)
{
    vavar(int, lfd);
    int fd;
    struct hthead *req;
    
    while(1) {
	block(lfd, EV_READ, 0);
	if((fd = recvreq(lfd, &req)) < 0) {
	    if(errno != 0)
		flog(LOG_ERR, "accesslog: error in recvreq: %s", strerror(errno));
	    exit(1);
	}
	mustart(filterreq, req, fd);
    }
}

static void chwatch(struct muth *mt, va_list args)
{
    vavar(int, cfd);
    
    block(cfd, EV_READ, 0);
    exitioloop(1);
}

static void floop(void)
{
    mustart(listenloop, 0);
    mustart(chwatch, ch);
    while(1) {
	switch(ioloop()) {
	case 0:
	case 1:
	    return;
	case 2:
	    reopenlog();
	    break;
	}
    }
}

static void sloop(void)
{
    int fd, ret;
    struct hthead *req;
    struct pollfd pfd[2];
    
    while(1) {
	if(reopen) {
	    reopenlog();
	    reopen = 0;
	}
	memset(pfd, 0, sizeof(pfd));
	pfd[0].fd = 0;
	pfd[0].events = POLLIN;
	pfd[1].fd = ch;
	pfd[1].events = POLLHUP;
	if((ret = poll(pfd, 2, -1)) < 0) {
	    if(errno != EINTR) {
		flog(LOG_ERR, "accesslog: error in poll: %s", strerror(errno));
		exit(1);
	    }
	}
	if(pfd[0].revents) {
	    if((fd = recvreq(0, &req)) < 0) {
		if(errno == 0)
		    return;
		flog(LOG_ERR, "accesslog: error in recvreq: %s", strerror(errno));
		exit(1);
	    }
	    serve(req, fd);
	    freehthead(req);
	    close(fd);
	}
	if(pfd[1].revents & POLLHUP)
	    return;
    }
}

static void usage(FILE *out)
{
    fprintf(out, "usage: accesslog [-hFaL] [-f FORMAT] [-p PIDFILE] OUTFILE CHILD [ARGS...]\n");
    fprintf(out, "       accesslog -P LOGFILE\n");
}

int main(int argc, char **argv)
{
    int c;
    char *pidfile;
    FILE *pidout;
    
    pidfile = NULL;
    while((c = getopt(argc, argv, "+hFaeLf:p:P:")) >= 0) {
	switch(c) {
	case 'h':
	    usage(stdout);
	    exit(0);
	case 'F':
	    flush = 0;
	    break;
	case 'L':
	    locklog = 0;
	    break;
	case 'e':
	    filter = 1;
	    break;
	case 'f':
	    format = optarg;
	    break;
	case 'P':
	    fetchpid(optarg);
	    exit(0);
	case 'p':
	    pidfile = optarg;
	    break;
	case 'a':
	    format = "%A - - [%{%d/%b/%Y:%H:%M:%S %z}t] \"%m %u %v\" %c %o \"%R\" \"%G\"";
	    break;
	default:
	    usage(stderr);
	    exit(1);
	}
    }
    if(argc - optind < 2) {
	usage(stderr);
	exit(1);
    }
    if(format == NULL)
	format = DEFFORMAT;
    if(!strcmp(argv[optind], "-"))
	outname = NULL;
    else
	outname = argv[optind];
    if(outname == NULL) {
	out = stdout;
	locklog = 0;
    } else {
	if((out = fopen(argv[optind], "a")) == NULL) {
	    flog(LOG_ERR, "accesslog: could not open %s for logging: %s", argv[optind], strerror(errno));
	    exit(1);
	}
	fcntl(fileno(out), F_SETFD, FD_CLOEXEC);
    }
    if(locklog) {
	if(lockfile(out)) {
	    if((errno == EAGAIN) || (errno == EACCES)) {
		flog(LOG_ERR, "accesslog: logfile is already locked", strerror(errno));
		exit(1);
	    } else {
		flog(LOG_WARNING, "accesslog: could not lock logfile: %s", strerror(errno));
	    }
	}
    }
    if((ch = stdmkchild(argv + optind + 1, NULL, NULL)) < 0) {
	flog(LOG_ERR, "accesslog: could not fork child: %s", strerror(errno));
	exit(1);
    }
    signal(SIGHUP, sighandler);
    if(pidfile) {
	if(!strcmp(pidfile, "-")) {
	    if(!outname) {
		flog(LOG_ERR, "accesslog: cannot derive PID file name without an output file");
		exit(1);
	    }
	    pidfile = sprintf2("%s.pid", outname);
	}
	if((pidout = fopen(pidfile, "w")) == NULL) {
	    flog(LOG_ERR, "accesslog: could not open PID file %s for writing: %s", pidfile);
	    exit(1);
	}
	fprintf(pidout, "%i\n", (int)getpid());
	fclose(pidout);
    }
    if(filter)
	floop();
    else
	sloop();
    fclose(out);
    if(pidfile != NULL)
	unlink(pidfile);
    return(0);
}
Commit	Line	Data
048ac115 FT	1	/*
	2	ashd - A Sane HTTP Daemon
	3	Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
	4
	5	This program is free software: you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation, either version 3 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18
	19	#include <stdlib.h>
	20	#include <stdio.h>
	21	#include <unistd.h>
	22	#include <string.h>
	23	#include <errno.h>
	24	#include <sys/poll.h>
	25	#include <time.h>
	26	#include <sys/time.h>
f99bcc64	27	#include <signal.h>
472abd3c	28	#include <fcntl.h>
5c805444	29	#include <stdint.h>
ca170d77	30	#include <sys/stat.h>
5c805444	31	#include <sys/socket.h>
048ac115 FT	32
	33	#ifdef HAVE_CONFIG_H
	34	#include <config.h>
	35	#endif
	36	#include <utils.h>
	37	#include <log.h>
	38	#include <req.h>
	39	#include <proc.h>
5c805444 FT	40	#include <mt.h>
5c805444 FT	41	#include <mtio.h>
b97cd36b	42	#include <bufio.h>
048ac115 FT	43
	44	#define DEFFORMAT "%{%Y-%m-%d %H:%M:%S}t %m %u %A \"%G\""
	45
5c805444 FT	46	static struct logdata {
	47	struct hthead req, resp;
	48	struct timeval start, end;
	49	off_t bytesin, bytesout;
	50	} defdata = {
	51	.bytesin = -1,
	52	.bytesout = -1,
	53	};
	54
	55	static int ch, filter;
f99bcc64	56	static char *outname = NULL;
048ac115	57	static FILE *out;
ca170d77	58	static int flush = 1, locklog = 1;
048ac115	59	static char *format;
f99bcc64	60	static volatile int reopen = 0;
048ac115	61
39522714	62	static void qputs(char sp, FILE o)
048ac115	63	{
39522714 FT	64	unsigned char s = (unsigned char )sp;
39522714 FT	65
048ac115 FT	66	for(; *s; s++) {
	67	if(*s == '\"') {
	68	fputs("\\\"", o);
	69	} else if(*s == '\\') {
	70	fputs("\\\\", o);
	71	} else if(*s == '\n') {
	72	fputs("\\n", o);
	73	} else if(*s == '\t') {
	74	fputs("\\t", o);
	75	} else if((s < 32) \|\| (s >= 128)) {
39522714	76	fprintf(o, "\\x%02x", (int)*s);
048ac115 FT	77	} else {
	78	fputc(*s, o);
	79	}
	80	}
	81	}
	82
5c805444	83	static void logitem(struct logdata data, char o, char d)
048ac115 FT	84	{
	85	char h, p;
	86	char buf[1024];
048ac115 FT	87
	88	switch(o) {
	89	case '%':
	90	putc('%', out);
	91	break;
	92	case 'h':
5c805444	93	if((h = getheader(data->req, d)) == NULL) {
048ac115 FT	94	putc('-', out);
	95	} else {
	96	qputs(h, out);
	97	}
	98	break;
	99	case 'u':
5c805444	100	qputs(data->req->url, out);
048ac115 FT	101	break;
048ac115 FT	102	case 'U':
5c805444 FT	103	strncpy(buf, data->req->url, sizeof(buf));
5c805444 FT	104	buf[sizeof(buf) - 1] = 0;
048ac115 FT	105	if((p = strchr(buf, '?')) != NULL)
	106	*p = 0;
	107	qputs(buf, out);
	108	break;
	109	case 'm':
5c805444	110	qputs(data->req->method, out);
048ac115 FT	111	break;
048ac115 FT	112	case 'r':
5c805444	113	qputs(data->req->rest, out);
048ac115 FT	114	break;
048ac115 FT	115	case 'v':
5c805444	116	qputs(data->req->ver, out);
048ac115 FT	117	break;
	118	case 't':
	119	if(!*d)
	120	d = "%a, %d %b %Y %H:%M:%S %z";
5c805444	121	strftime(buf, sizeof(buf), d, localtime(&data->start.tv_sec));
048ac115 FT	122	qputs(buf, out);
	123	break;
	124	case 'T':
	125	if(!*d)
	126	d = "%a, %d %b %Y %H:%M:%S %z";
5c805444	127	strftime(buf, sizeof(buf), d, gmtime(&data->start.tv_sec));
048ac115 FT	128	qputs(buf, out);
	129	break;
	130	case 's':
5c805444 FT	131	fprintf(out, "%06i", (int)data->start.tv_usec);
	132	break;
	133	case 'c':
	134	if(!data->resp)
	135	putc('-', out);
	136	else
	137	fprintf(out, "%i", data->resp->code);
	138	break;
	139	case 'i':
	140	if(data->bytesin < 0)
	141	putc('-', out);
	142	else
	143	fprintf(out, "%ji", (intmax_t)data->bytesin);
	144	break;
	145	case 'o':
	146	if(data->bytesout < 0)
	147	putc('-', out);
	148	else
	149	fprintf(out, "%ji", (intmax_t)data->bytesout);
	150	break;
	151	case 'd':
	152	if((data->end.tv_sec == 0) && (data->end.tv_usec == 0))
	153	fputc('-', out);
	154	else
	155	fprintf(out, "%.6f", (data->end.tv_sec - data->start.tv_sec) + ((data->end.tv_usec - data->start.tv_usec) / 1000000.0));
048ac115 FT	156	break;
048ac115 FT	157	case 'A':
5c805444	158	logitem(data, 'h', "X-Ash-Address");
048ac115 FT	159	break;
048ac115 FT	160	case 'H':
5c805444	161	logitem(data, 'h', "Host");
048ac115 FT	162	break;
048ac115 FT	163	case 'R':
5c805444	164	logitem(data, 'h', "Referer");
048ac115 FT	165	break;
048ac115 FT	166	case 'G':
5c805444	167	logitem(data, 'h', "User-Agent");
048ac115 FT	168	break;
	169	}
	170	}
	171
5c805444	172	static void logreq(struct logdata *data)
048ac115 FT	173	{
	174	char p, p2;
	175	char d[strlen(format)];
	176	char o;
	177
	178	p = format;
	179	while(*p) {
	180	if(*p == '%') {
	181	p++;
	182	if(*p == '{') {
	183	p++;
	184	if((p2 = strchr(p, '}')) == NULL)
	185	continue;
	186	memcpy(d, p, p2 - p);
	187	d[p2 - p] = 0;
	188	p = p2 + 1;
	189	} else {
	190	d[0] = 0;
	191	}
	192	o = *p++;
	193	if(o == 0)
	194	break;
5c805444	195	logitem(data, o, d);
048ac115 FT	196	} else {
	197	fputc(*p++, out);
	198	}
	199	}
	200	fputc('\n', out);
	201	if(flush)
	202	fflush(out);
	203	}
	204
	205	static void serve(struct hthead *req, int fd)
	206	{
5c805444 FT	207	struct logdata data;
	208
	209	data = defdata;
	210	data.req = req;
	211	gettimeofday(&data.start, NULL);
048ac115 FT	212	if(sendreq(ch, req, fd)) {
	213	flog(LOG_ERR, "accesslog: could not pass request to child: %s", strerror(errno));
	214	exit(1);
	215	}
5c805444 FT	216	logreq(&data);
	217	}
	218
b97cd36b	219	static int passdata(struct bufio in, struct bufio out, off_t *passed)
5c805444	220	{
b97cd36b	221	ssize_t read;
5c805444	222	off_t total;
5c805444 FT	223
5c805444 FT	224	total = 0;
b97cd36b	225	while(!bioeof(in)) {
417b376e FT	226	if((read = biordata(in)) > 0) {
	227	if((read = biowritesome(out, in->rbuf.b + in->rh, read)) < 0)
	228	return(-1);
	229	in->rh += read;
	230	total += read;
	231	}
b97cd36b FT	232	if(biorspace(in) && (biofillsome(in) < 0))
b97cd36b FT	233	return(-1);
5c805444 FT	234	}
	235	if(passed)
	236	*passed = total;
	237	return(0);
	238	}
	239
	240	static void filterreq(struct muth *mt, va_list args)
	241	{
	242	vavar(struct hthead *, req);
	243	vavar(int, fd);
	244	int pfds[2];
	245	struct hthead *resp;
b97cd36b	246	struct bufio cl, hd;
5c805444 FT	247	struct logdata data;
	248
	249	hd = NULL;
	250	resp = NULL;
	251	data = defdata;
	252	data.req = req;
	253	gettimeofday(&data.start, NULL);
b97cd36b	254	cl = mtbioopen(fd, 1, 600, "r+", NULL);
5c805444 FT	255	if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
5c805444 FT	256	goto out;
b97cd36b	257	hd = mtbioopen(pfds[1], 1, 600, "r+", NULL);
5c805444 FT	258	if(sendreq(ch, req, pfds[0])) {
	259	close(pfds[0]);
	260	goto out;
	261	}
	262	close(pfds[0]);
	263
	264	if(passdata(cl, hd, &data.bytesin))
	265	goto out;
b97cd36b	266	if(bioflush(hd))
ff28e3a5	267	goto out;
5c805444	268	shutdown(pfds[1], SHUT_WR);
b97cd36b	269	if((resp = parseresponseb(hd)) == NULL)
5c805444 FT	270	goto out;
5c805444 FT	271	data.resp = resp;
b97cd36b FT	272	writerespb(cl, resp);
b97cd36b FT	273	bioprintf(cl, "\r\n");
5c805444 FT	274	if(passdata(hd, cl, &data.bytesout))
	275	goto out;
	276	gettimeofday(&data.end, NULL);
	277
	278	out:
	279	logreq(&data);
	280
	281	freehthead(req);
	282	if(resp != NULL)
	283	freehthead(resp);
b97cd36b	284	bioclose(cl);
5c805444	285	if(hd != NULL)
b97cd36b	286	bioclose(hd);
048ac115 FT	287	}
048ac115 FT	288
f99bcc64 FT	289	static void sighandler(int sig)
f99bcc64 FT	290	{
5c805444 FT	291	if(sig == SIGHUP) {
	292	if(filter)
	293	exitioloop(2);
	294	else
	295	reopen = 1;
	296	}
f99bcc64 FT	297	}
f99bcc64 FT	298
ca170d77 FT	299	static int lockfile(FILE *file)
	300	{
	301	struct flock ld;
	302
	303	memset(&ld, 0, sizeof(ld));
	304	ld.l_type = F_WRLCK;
	305	ld.l_whence = SEEK_SET;
	306	ld.l_start = 0;
	307	ld.l_len = 0;
	308	return(fcntl(fileno(file), F_SETLK, &ld));
	309	}
	310
	311	static void fetchpid(char *filename)
	312	{
	313	int fd, ret;
	314	struct flock ld;
	315
	316	if((fd = open(filename, O_WRONLY)) < 0) {
	317	fprintf(stderr, "accesslog: %s: %s\n", filename, strerror(errno));
	318	exit(1);
	319	}
	320	memset(&ld, 0, sizeof(ld));
	321	ld.l_type = F_WRLCK;
	322	ld.l_whence = SEEK_SET;
	323	ld.l_start = 0;
	324	ld.l_len = 0;
	325	ret = fcntl(fd, F_GETLK, &ld);
	326	close(fd);
	327	if(ret) {
	328	fprintf(stderr, "accesslog: %s: %s\n", filename, strerror(errno));
	329	exit(1);
	330	}
	331	if(ld.l_type == F_UNLCK) {
	332	fprintf(stderr, "accesslog: %s: not locked\n", filename);
	333	exit(1);
	334	}
	335	printf("%i\n", (int)ld.l_pid);
	336	}
	337
f99bcc64 FT	338	static void reopenlog(void)
	339	{
	340	FILE *new;
ca170d77	341	struct stat olds, news;
f99bcc64 FT	342
	343	if(outname == NULL) {
	344	flog(LOG_WARNING, "accesslog: received SIGHUP but logging to stdout, so ignoring");
	345	return;
	346	}
ca170d77 FT	347	if(locklog) {
	348	if(fstat(fileno(out), &olds)) {
	349	flog(LOG_ERR, "accesslog: could not stat current logfile(?!): %s", strerror(errno));
	350	return;
	351	}
	352	if(!stat(outname, &news)) {
	353	if((olds.st_dev == news.st_dev) && (olds.st_ino == news.st_ino)) {
	354	/*
	355	* This needs to be ignored, because if the same logfile
	356	* is opened and then closed, the lock is lost. To quote
	357	* the Linux fcntl(2) manpage: "This is bad." No kidding.
	358	*
	359	* Technically, there is a race condition here when the
	360	* file has been stat'ed but not yet opened, where the old
	361	* log file, having been previously renamed, changes name
	362	* back to the name accesslog knows and is thus reopened
	363	* regardlessly, but I think that might fit under the
	364	* idiom "pathological case". It should, at least, not be
	365	* a security problem.
	366	*/
	367	flog(LOG_INFO, "accesslog: received SIGHUP, but logfile has not changed, so ignoring");
	368	return;
	369	}
	370	}
	371	}
f99bcc64 FT	372	if((new = fopen(outname, "a")) == NULL) {
	373	flog(LOG_WARNING, "accesslog: could not reopen log file `%s' on SIGHUP: %s", outname, strerror(errno));
	374	return;
	375	}
e09f3227	376	fcntl(fileno(new), F_SETFD, FD_CLOEXEC);
ca170d77 FT	377	if(locklog) {
	378	if(lockfile(new)) {
	379	if((errno == EAGAIN) \|\| (errno == EACCES)) {
	380	flog(LOG_ERR, "accesslog: logfile is already locked; reverting to current log", strerror(errno));
	381	fclose(new);
	382	return;
	383	} else {
	384	flog(LOG_WARNING, "accesslog: could not lock logfile, so no lock will be held: %s", strerror(errno));
	385	}
	386	}
	387	}
f99bcc64 FT	388	fclose(out);
	389	out = new;
	390	}
	391
5c805444 FT	392	static void listenloop(struct muth *mt, va_list args)
	393	{
	394	vavar(int, lfd);
	395	int fd;
	396	struct hthead *req;
	397
	398	while(1) {
	399	block(lfd, EV_READ, 0);
	400	if((fd = recvreq(lfd, &req)) < 0) {
	401	if(errno != 0)
	402	flog(LOG_ERR, "accesslog: error in recvreq: %s", strerror(errno));
	403	exit(1);
	404	}
	405	mustart(filterreq, req, fd);
	406	}
	407	}
	408
	409	static void chwatch(struct muth *mt, va_list args)
	410	{
	411	vavar(int, cfd);
	412
	413	block(cfd, EV_READ, 0);
	414	exitioloop(1);
	415	}
	416
	417	static void floop(void)
	418	{
	419	mustart(listenloop, 0);
	420	mustart(chwatch, ch);
	421	while(1) {
	422	switch(ioloop()) {
	423	case 0:
	424	case 1:
	425	return;
	426	case 2:
	427	reopenlog();
	428	break;
	429	}
	430	}
	431	}
	432
	433	static void sloop(void)
	434	{
	435	int fd, ret;
	436	struct hthead *req;
	437	struct pollfd pfd[2];
	438
	439	while(1) {
	440	if(reopen) {
	441	reopenlog();
	442	reopen = 0;
	443	}
	444	memset(pfd, 0, sizeof(pfd));
	445	pfd[0].fd = 0;
	446	pfd[0].events = POLLIN;
	447	pfd[1].fd = ch;
	448	pfd[1].events = POLLHUP;
	449	if((ret = poll(pfd, 2, -1)) < 0) {
	450	if(errno != EINTR) {
	451	flog(LOG_ERR, "accesslog: error in poll: %s", strerror(errno));
	452	exit(1);
	453	}
	454	}
	455	if(pfd[0].revents) {
456	if((fd = recvreq(0, &req)) < 0) {
457	if(errno == 0)
458	return;
459	flog(LOG_ERR, "accesslog: error in recvreq: %s", strerror(errno));
460	exit(1);
461	}
462	serve(req, fd);
463	freehthead(req);
464	close(fd);
465	}
466	if(pfd[1].revents & POLLHUP)
467	return;
468	}
469	}
470
048ac115 FT	471	static void usage(FILE *out)
048ac115 FT	472	{
ca170d77	473	fprintf(out, "usage: accesslog [-hFaL] [-f FORMAT] [-p PIDFILE] OUTFILE CHILD [ARGS...]\n");
e51483a1	474	fprintf(out, " accesslog -P LOGFILE\n");
048ac115 FT	475	}
	476
	477	int main(int argc, char **argv)
	478	{
5c805444	479	int c;
472abd3c FT	480	char *pidfile;
472abd3c FT	481	FILE *pidout;
048ac115	482
472abd3c	483	pidfile = NULL;
5c805444	484	while((c = getopt(argc, argv, "+hFaeLf:p:P:")) >= 0) {
048ac115 FT	485	switch(c) {
	486	case 'h':
	487	usage(stdout);
	488	exit(0);
048ac115 FT	489	case 'F':
	490	flush = 0;
	491	break;
ca170d77 FT	492	case 'L':
	493	locklog = 0;
	494	break;
5c805444 FT	495	case 'e':
	496	filter = 1;
	497	break;
048ac115 FT	498	case 'f':
	499	format = optarg;
	500	break;
ca170d77 FT	501	case 'P':
	502	fetchpid(optarg);
	503	exit(0);
472abd3c FT	504	case 'p':
	505	pidfile = optarg;
	506	break;
048ac115	507	case 'a':
5c805444	508	format = "%A - - [%{%d/%b/%Y:%H:%M:%S %z}t] \"%m %u %v\" %c %o \"%R\" \"%G\"";
048ac115 FT	509	break;
	510	default:
	511	usage(stderr);
	512	exit(1);
	513	}
	514	}
9701afc5	515	if(argc - optind < 2) {
048ac115 FT	516	usage(stderr);
	517	exit(1);
	518	}
	519	if(format == NULL)
	520	format = DEFFORMAT;
f99bcc64 FT	521	if(!strcmp(argv[optind], "-"))
	522	outname = NULL;
	523	else
	524	outname = argv[optind];
	525	if(outname == NULL) {
9701afc5	526	out = stdout;
e09f3227	527	locklog = 0;
9701afc5 FT	528	} else {
	529	if((out = fopen(argv[optind], "a")) == NULL) {
	530	flog(LOG_ERR, "accesslog: could not open %s for logging: %s", argv[optind], strerror(errno));
048ac115 FT	531	exit(1);
048ac115 FT	532	}
e09f3227	533	fcntl(fileno(out), F_SETFD, FD_CLOEXEC);
048ac115	534	}
ca170d77 FT	535	if(locklog) {
	536	if(lockfile(out)) {
	537	if((errno == EAGAIN) \|\| (errno == EACCES)) {
	538	flog(LOG_ERR, "accesslog: logfile is already locked", strerror(errno));
	539	exit(1);
	540	} else {
	541	flog(LOG_WARNING, "accesslog: could not lock logfile: %s", strerror(errno));
	542	}
	543	}
	544	}
9701afc5	545	if((ch = stdmkchild(argv + optind + 1, NULL, NULL)) < 0) {
e3f12675	546	flog(LOG_ERR, "accesslog: could not fork child: %s", strerror(errno));
048ac115 FT	547	exit(1);
048ac115 FT	548	}
f99bcc64	549	signal(SIGHUP, sighandler);
472abd3c FT	550	if(pidfile) {
	551	if(!strcmp(pidfile, "-")) {
	552	if(!outname) {
	553	flog(LOG_ERR, "accesslog: cannot derive PID file name without an output file");
	554	exit(1);
	555	}
	556	pidfile = sprintf2("%s.pid", outname);
	557	}
	558	if((pidout = fopen(pidfile, "w")) == NULL) {
	559	flog(LOG_ERR, "accesslog: could not open PID file %s for writing: %s", pidfile);
	560	exit(1);
	561	}
	562	fprintf(pidout, "%i\n", (int)getpid());
	563	fclose(pidout);
	564	}
5c805444 FT	565	if(filter)
	566	floop();
	567	else
	568	sloop();
f95bc205	569	fclose(out);
472abd3c FT	570	if(pidfile != NULL)
472abd3c FT	571	unlink(pidfile);
048ac115 FT	572	return(0);
048ac115 FT	573	}