X-Git-Url: http://www.dolda2000.com/gitweb/?a=blobdiff_plain;f=src%2Fhtparser.c;h=e281abd85701d9b11bea7e9aa7bd9323b6b0d2ff;hb=7d1e14f405f389656604c68e18a381feabcd3d4a;hp=0aa0032bee4634193dca1288666422f75f90d721;hpb=f0bbedf750f1530ec05bf2b8122479c924bbf2fe;p=ashd.git

diff --git a/src/htparser.c b/src/htparser.c
index 0aa0032..e281abd 100644
--- a/src/htparser.c
+++ b/src/htparser.c
@@ -19,12 +19,704 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <pwd.h>
+#include <sys/signal.h>
+#include <errno.h>
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
 #include <utils.h>
+#include <mt.h>
+#include <mtio.h>
+#include <log.h>
+#include <req.h>
+#include <proc.h>
+#include <bufio.h>
+
+#include "htparser.h"
+
+static int plex;
+static int daemonize, usesyslog;
+struct mtbuf listeners;
+
+static void trimx(struct hthead *req)
+{
+    int i;
+    
+    i = 0;
+    while(i < req->noheaders) {
+	if(!strncasecmp(req->headers[i][0], "x-ash-", 6)) {
+	    free(req->headers[i][0]);
+	    free(req->headers[i][1]);
+	    free(req->headers[i]);
+	    memmove(req->headers + i, req->headers + i + 1, sizeof(*req->headers) * (--req->noheaders - i));
+	} else {
+	    i++;
+	}
+    }
+}
+
+static struct hthead *parsereq(struct bufio *in)
+{
+    struct hthead *req;
+    struct charbuf method, url, ver;
+    int c;
+    
+    req = NULL;
+    bufinit(method);
+    bufinit(url);
+    bufinit(ver);
+    while(1) {
+	c = biogetc(in);
+	if(c == ' ') {
+	    break;
+	} else if((c == EOF) || (c < 32) || (c >= 128)) {
+	    goto fail;
+	} else {
+	    bufadd(method, c);
+	    if(method.d >= 128)
+		goto fail;
+	}
+    }
+    while(1) {
+	c = biogetc(in);
+	if(c == ' ') {
+	    break;
+	} else if((c == EOF) || (c < 32)) {
+	    goto fail;
+	} else {
+	    bufadd(url, c);
+	    if(url.d >= 65536)
+		goto fail;
+	}
+    }
+    while(1) {
+	c = biogetc(in);
+	if(c == 10) {
+	    break;
+	} else if(c == 13) {
+	} else if((c == EOF) || (c < 32) || (c >= 128)) {
+	    goto fail;
+	} else {
+	    bufadd(ver, c);
+	    if(ver.d >= 128)
+		goto fail;
+	}
+    }
+    bufadd(method, 0);
+    bufadd(url, 0);
+    bufadd(ver, 0);
+    req = mkreq(method.b, url.b, ver.b);
+    if(parseheadersb(req, in))
+	goto fail;
+    trimx(req);
+    goto out;
+    
+fail:
+    if(req != NULL) {
+	freehthead(req);
+	req = NULL;
+    }
+out:
+    buffree(method);
+    buffree(url);
+    buffree(ver);
+    return(req);
+}
+
+static off_t passdata(struct bufio *in, struct bufio *out, off_t max)
+{
+    ssize_t read;
+    off_t total;
+    
+    total = 0;
+    while(!bioeof(in) && ((max < 0) || (total < max))) {
+	if((read = biordata(in)) > 0) {
+	    if(max >= 0)
+		read = min(max - total, read);
+	    if((read = biowritesome(out, in->rbuf.b + in->rh, read)) < 0)
+		return(-1);
+	    in->rh += read;
+	    total += read;
+	}
+	if(biorspace(in) && ((max < 0) || (biordata(in) < max - total)) && (biofillsome(in) < 0))
+	    return(-1);
+    }
+    return(total);
+}
+
+static int recvchunks(struct bufio *in, struct bufio *out)
+{
+    ssize_t read, chlen;
+    int c, r;
+    
+    while(1) {
+	chlen = 0;
+	r = 0;
+	while(1) {
+	    c = biogetc(in);
+	    if(c == 10) {
+		if(!r)
+		    return(-1);
+		break;
+	    } else if(c == 13) {
+	    } else if((c >= '0') && (c <= '9')) {
+		chlen = (chlen << 4) + (c - '0');
+		r = 1;
+	    } else if((c >= 'A') && (c <= 'F')) {
+		chlen = (chlen << 4) + (c + 10 - 'A');
+		r = 1;
+	    } else if((c >= 'a') && (c <= 'f')) {
+		chlen = (chlen << 4) + (c + 10 - 'a');
+		r = 1;
+	    } else {
+		/* XXX: Technically, there may be chunk extensions to
+		 * be read, but since that will likely never actually
+		 * happen in practice, I can just as well add support
+		 * for that if it actually does become relevant. */
+		return(-1);
+	    }
+	}
+	if(chlen == 0)
+	    break;
+	while(chlen > 0) {
+	    if((read = biordata(in)) > 0) {
+		if((read = biowritesome(out, in->rbuf.b + in->rh, min(read, chlen))) < 0)
+		    return(-1);
+		in->rh += read;
+		chlen -= read;
+	    }
+	    if(biorspace(in) && (biordata(in) < chlen) && (biofillsome(in) <= 0))
+		return(-1);
+	}
+	if((biogetc(in) != 13) || (biogetc(in) != 10))
+	    return(-1);
+    }
+    /* XXX: Technically, there may be trailers to be read, but that's
+     * just about as likely as chunk extensions. */
+    if((biogetc(in) != 13) || (biogetc(in) != 10))
+	return(-1);
+    return(0);
+}
+
+static int passchunks(struct bufio *in, struct bufio *out)
+{
+    size_t read;
+    
+    while(!bioeof(in)) {
+	if((read = biordata(in)) > 0) {
+	    bioprintf(out, "%zx\r\n", read);
+	    if(biowrite(out, in->rbuf.b + in->rh, read) != read)
+		return(-1);
+	    in->rh += read;
+	    bioprintf(out, "\r\n");
+	    if(bioflush(out) < 0)
+		return(-1);
+	}
+	if(biorspace(in) && (biofillsome(in) < 0))
+	    return(-1);
+    }
+    bioprintf(out, "0\r\n\r\n");
+    return(0);
+}
+
+static int hasheader(struct hthead *head, char *name, char *val)
+{
+    char *hd;
+    
+    if((hd = getheader(head, name)) == NULL)
+	return(0);
+    return(!strcasecmp(hd, val));
+}
+
+static int canonreq(struct hthead *req)
+{
+    char *p, *p2, *r;
+    int n;
+
+    if(req->url[0] == '/') {
+	replrest(req, req->url + 1);
+	if((p = strchr(req->rest, '?')) != NULL)
+	    *p = 0;
+	return(1);
+    }
+    if((p = strstr(req->url, "://")) != NULL) {
+	n = p - req->url;
+	if(((n == 4) && !strncasecmp(req->url, "http", 4)) ||
+	   ((n == 5) && !strncasecmp(req->url, "https", 5))) {
+	    if(getheader(req, "host"))
+		return(0);
+	    p += 3;
+	    if((p2 = strchr(p, '/')) == NULL) {
+		headappheader(req, "Host", p);
+		free(req->url);
+		req->url = sstrdup("/");
+	    } else {
+		r = sstrdup(p2);
+		*(p2++) = 0;
+		headappheader(req, "Host", p);
+		free(req->url);
+		req->url = r;
+	    }
+	    replrest(req, req->url + 1);
+	    if((p = strchr(req->rest, '?')) != NULL)
+		*p = 0;
+	    return(1);
+	}
+    }
+    return(0);
+}
+
+static int http10keep(struct hthead *req, struct hthead *resp)
+{
+    int fc;
+    
+    fc = hasheader(resp, "connection", "close");
+    headrmheader(resp, "connection");
+    if(!fc && hasheader(req, "connection", "keep-alive")) {
+	headappheader(resp, "Connection", "Keep-Alive");
+	return(1);
+    } else {
+	return(0);
+    }
+}
+
+static char *connid(void)
+{
+    static struct charbuf cur;
+    int i;
+    char *ret;
+    
+    for(i = 0; i < cur.d; i++) {
+	if((++cur.b[i]) > 'Z')
+	    cur.b[i] = 'A';
+	else
+	    goto done;
+    }
+    bufadd(cur, 'A');
+done:
+    ret = memcpy(smalloc(cur.d + 1), cur.b, cur.d);
+    ret[cur.d] = 0;
+    return(ret);
+}
+
+static void passduplex(struct bufio *a, int afd, struct bufio *b, int bfd)
+{
+    struct selected pfd[4], sel;
+    struct bufio *sio;
+    int n, ev;
+    
+    while(!bioeof(a) && !bioeof(b)) {
+	biocopybuf(b, a);
+	biocopybuf(a, b);
+	n = 0;
+	if(!a->eof) {
+	    ev = 0;
+	    if(biorspace(a))
+		ev |= EV_READ;
+	    if(biowdata(a))
+		ev |= EV_WRITE;
+	    if(ev)
+		pfd[n++] = (struct selected){.fd = afd, .ev = ev};
+	}
+	if(!b->eof) {
+	    ev = 0;
+	    if(!b->eof && biorspace(b))
+		ev |= EV_READ;
+	    if(biowdata(b))
+		ev |= EV_WRITE;
+	    if(ev)
+		pfd[n++] = (struct selected){.fd = bfd, .ev = ev};
+	}
+	if((sel = mblock(600, n, pfd)).ev == 0)
+	    break;
+	if(sel.fd == afd)
+	    sio = a;
+	else if(sel.fd == bfd)
+	    sio = b;
+	else
+	    break;
+	if((sel.ev & EV_READ) && (biofillsome(sio) < 0))
+	    break;
+	if((sel.ev & EV_WRITE) && (bioflushsome(sio) < 0))
+	    break;
+    }
+}
+
+void serve(struct bufio *in, int infd, struct conn *conn)
+{
+    int pfds[2];
+    struct bufio *out, *dout;
+    struct stdiofd *outi;
+    struct hthead *req, *resp;
+    char *hd, *id;
+    off_t dlen;
+    int keep, duplex;
+    
+    id = connid();
+    out = NULL;
+    req = resp = NULL;
+    while(plex >= 0) {
+	bioflush(in);
+	if((req = parsereq(in)) == NULL)
+	    break;
+	if(!canonreq(req))
+	    break;
+	
+	headappheader(req, "X-Ash-Connection-ID", id);
+	if((conn->initreq != NULL) && conn->initreq(conn, req))
+	    break;
+	
+	if((plex < 0) || block(plex, EV_WRITE, 60) <= 0)
+	    break;
+	if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
+	    break;
+	if(sendreq(plex, req, pfds[0]))
+	    break;
+	close(pfds[0]);
+	out = mtbioopen(pfds[1], 1, 600, "r+", &outi);
+
+	if(getheader(req, "content-type") != NULL) {
+	    if((hd = getheader(req, "content-length")) != NULL) {
+		dlen = atoo(hd);
+		if(dlen > 0) {
+		    if(passdata(in, out, dlen) != dlen)
+			break;
+		}
+	    } else if(((hd = getheader(req, "transfer-encoding")) != NULL) && !strcasecmp(hd, "chunked")) {
+		if(recvchunks(in, out))
+		    break;
+	    } else {
+		/* Ignore rather than abort, to be kinder to broken clients. */
+		headrmheader(req, "content-type");
+	    }
+	}
+	if(bioflush(out))
+	    break;
+	/* Make sure to send EOF */
+	shutdown(pfds[1], SHUT_WR);
+	
+	if((resp = parseresponseb(out)) == NULL)
+	    break;
+	replstr(&resp->ver, req->ver);
+	
+	if(!getheader(resp, "server"))
+	    headappheader(resp, "Server", sprintf3("ashd/%s", VERSION));
+	duplex = hasheader(resp, "x-ash-switch", "duplex");
+	trimx(resp);
+
+	if(duplex) {
+	    if(outi->rights < 0)
+		break;
+	    writerespb(in, resp);
+	    bioprintf(in, "\r\n");
+	    dout = mtbioopen(outi->rights, 1, 600, "r+", NULL);
+	    passduplex(in, infd, dout, outi->rights);
+	    outi->rights = -1;
+	    bioclose(dout);
+	    break;
+	} else if(!strcasecmp(req->ver, "HTTP/1.0")) {
+	    if(!strcasecmp(req->method, "head")) {
+		keep = http10keep(req, resp);
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+	    } else if((hd = getheader(resp, "content-length")) != NULL) {
+		keep = http10keep(req, resp);
+		dlen = atoo(hd);
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+		if(passdata(out, in, dlen) != dlen)
+		    break;
+	    } else {
+		headrmheader(resp, "connection");
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+		passdata(out, in, -1);
+		break;
+	    }
+	    if(!keep)
+		break;
+	} else if(!strcasecmp(req->ver, "HTTP/1.1")) {
+	    if(!strcasecmp(req->method, "head")) {
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+	    } else if((hd = getheader(resp, "content-length")) != NULL) {
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+		dlen = atoo(hd);
+		if(passdata(out, in, dlen) != dlen)
+		    break;
+	    } else if(!getheader(resp, "transfer-encoding")) {
+		headappheader(resp, "Transfer-Encoding", "chunked");
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+		if(passchunks(out, in))
+		    break;
+	    } else {
+		writerespb(in, resp);
+		bioprintf(in, "\r\n");
+		passdata(out, in, -1);
+		break;
+	    }
+	    if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
+		break;
+	} else {
+	    break;
+	}
+
+	bioclose(out);
+	out = NULL;
+	freehthead(req);
+	freehthead(resp);
+	req = resp = NULL;
+    }
+    
+    if(out != NULL)
+	bioclose(out);
+    if(req != NULL)
+	freehthead(req);
+    if(resp != NULL)
+	freehthead(resp);
+    bioclose(in);
+    free(id);
+}
+
+static void plexwatch(struct muth *muth, va_list args)
+{
+    vavar(int, fd);
+    char *buf;
+    int i, s, ret;
+    
+    s = 0;
+    while(1) {
+	if(block(fd, EV_READ, 0) == 0)
+	    break;
+	buf = smalloc(65536);
+	ret = recv(fd, buf, 65536, 0);
+	if(ret < 0) {
+	    flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno));
+	    exit(1);
+	} else if(ret == 0) {
+	    s = 1;
+	    free(buf);
+	    break;
+	}
+	/* Maybe I'd like to implement some protocol in this direction
+	 * some day... */
+	free(buf);
+    }
+    shutdown(plex, SHUT_RDWR);
+    for(i = 0; i < listeners.d; i++) {
+	if(listeners.b[i] == muth)
+	    bufdel(listeners, i);
+    }
+    if(s) {
+	flog(LOG_INFO, "root handler exited, so shutting down listening...");
+	while(listeners.d > 0)
+	    resume(listeners.b[0], 0);
+    }
+}
+
+static void initroot(void *uu)
+{
+    int fd;
+    
+    setsid();
+    if(daemonize) {
+	chdir("/");
+	if((fd = open("/dev/null", O_RDWR)) >= 0) {
+	    dup2(fd, 0);
+	    dup2(fd, 1);
+	    dup2(fd, 2);
+	    close(fd);
+	}
+    }
+    if(usesyslog)
+	putenv("ASHD_USESYSLOG=1");
+    else
+	unsetenv("ASHD_USESYSLOG");
+}
+
+static void usage(FILE *out)
+{
+    fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] [-p PIDFILE] PORTSPEC... -- ROOT [ARGS...]\n");
+    fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
+    fprintf(out, "\tavailable handlers are `plain' and `ssl'.\n");
+}
+
+static void addport(char *spec)
+{
+    char *nm, *p, *p2, *n;
+    struct charvbuf pars, vals;
+    
+    bufinit(pars);
+    bufinit(vals);
+    if((p = strchr(spec, ':')) == NULL) {
+	nm = spec;
+    } else {
+	nm = spec;
+	*(p++) = 0;
+	do {
+	    if((n = strchr(p, ',')) != NULL)
+		*(n++) = 0;
+	    if((p2 = strchr(p, '=')) != NULL)
+		*(p2++) = 0;
+	    if(!*p) {
+		usage(stderr);
+		exit(1);
+	    }
+	    bufadd(pars, p);
+	    if(p2)
+		bufadd(vals, p2);
+	    else
+		bufadd(vals, "");
+	} while((p = n) != NULL);
+    }
+    
+    /* XXX: It would be nice to decentralize this, but, meh... */
+    if(!strcmp(nm, "plain")) {
+	handleplain(pars.d, pars.b, vals.b);
+#ifdef HAVE_GNUTLS
+    } else if(!strcmp(nm, "ssl")) {
+	handlegnussl(pars.d, pars.b, vals.b);
+#endif
+    } else {
+	flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
+	exit(1);
+    }
+    
+    buffree(pars);
+    buffree(vals);
+}
+
+static void sighandler(int sig)
+{
+    exitioloop(1);
+}
 
 int main(int argc, char **argv)
 {
+    int c, d;
+    int i, s1;
+    char *root, *pidfile, *pidtmp;
+    FILE *pidout;
+    struct passwd *pwent;
+    
+    daemonize = usesyslog = 0;
+    root = pidfile = NULL;
+    pwent = NULL;
+    while((c = getopt(argc, argv, "+hSfu:r:p:")) >= 0) {
+	switch(c) {
+	case 'h':
+	    usage(stdout);
+	    exit(0);
+	case 'f':
+	    daemonize = 1;
+	    break;
+	case 'S':
+	    usesyslog = 1;
+	    break;
+	case 'u':
+	    if(optarg[0] && ((pwent = getpwnam(optarg)) == NULL)) {
+		flog(LOG_ERR, "could not find user %s", optarg);
+		exit(1);
+	    }
+	    break;
+	case 'r':
+	    root = optarg[0] ? optarg : NULL;
+	    break;
+	case 'p':
+	    pidfile = optarg[0] ? optarg : NULL;
+	    break;
+	default:
+	    usage(stderr);
+	    exit(1);
+	}
+    }
+    s1 = 0;
+    for(i = optind; i < argc; i++) {
+	if(!strcmp(argv[i], "--"))
+	    break;
+	s1 = 1;
+	addport(argv[i]);
+    }
+    if(!s1 || (i == argc)) {
+	usage(stderr);
+	exit(1);
+    }
+    if((plex = stdmkchild(argv + ++i, initroot, NULL)) < 0) {
+	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
+	return(1);
+    }
+    bufadd(listeners, mustart(plexwatch, plex));
+    pidout = NULL;
+    if(pidfile != NULL) {
+	pidtmp = sprintf3("%s.new", pidfile);
+	if((pidout = fopen(pidtmp, "w")) == NULL) {
+	    flog(LOG_ERR, "could not open %s for writing: %s", pidtmp, strerror(errno));
+	    return(1);
+	}
+	if(rename(pidtmp, pidfile)) {
+	    flog(LOG_ERR, "could not overwrite %s: %s", pidfile, strerror(errno));
+	    unlink(pidtmp);
+	    return(1);
+	}
+    }
+    if(usesyslog)
+	opensyslog();
+    if(root) {
+	if(chdir(root) || chroot(root)) {
+	    flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno));
+	    exit(1);
+	}
+    }
+    if(pwent) {
+	if(setgid(pwent->pw_gid)) {
+	    flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno));
+	    exit(1);
+	}
+	if(setuid(pwent->pw_uid)) {
+	    flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno));
+	    exit(1);
+	}
+    }
+    signal(SIGPIPE, SIG_IGN);
+    signal(SIGCHLD, SIG_IGN);
+    signal(SIGINT, sighandler);
+    signal(SIGTERM, sighandler);
+    if(daemonize) {
+	daemon(0, 0);
+    }
+    if(pidout != NULL) {
+	fprintf(pidout, "%i\n", getpid());
+	fflush(pidout);
+    }
+    d = 0;
+    while(!d) {
+	switch(ioloop()) {
+	case 0:
+	    d = 1;
+	    break;
+	case 1:
+	    if(listeners.d > 0) {
+		while(listeners.d > 0)
+		    resume(listeners.b[0], 0);
+		flog(LOG_INFO, "no longer listening");
+		if(pidout != NULL) {
+		    putc('\n', pidout);
+		    fflush(pidout);
+		}
+	    } else {
+		d = 1;
+	    }
+	    break;
+	}
+    }
+    if(pidout != NULL)
+	ftruncate(fileno(pidout), 0);
+    return(0);
 }