X-Git-Url: http://www.dolda2000.com/gitweb/?p=ashd.git;a=blobdiff_plain;f=src%2Fhtparser.c;h=1ed91754f78f36d62c6de672fb7c1a06a9a3fff8;hp=0aa0032bee4634193dca1288666422f75f90d721;hb=90b0ba0f9d93e454cc08a566b718abdcbfd0d9f6;hpb=f0bbedf750f1530ec05bf2b8122479c924bbf2fe

diff --git a/src/htparser.c b/src/htparser.c
index 0aa0032..1ed9175 100644
--- a/src/htparser.c
+++ b/src/htparser.c
@@ -19,12 +19,515 @@
 #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 "htparser.h"
+
+static int plex;
+static char *pidfile = NULL;
+static int daemonize, usesyslog;
+
+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(FILE *in)
+{
+    struct hthead *req;
+    struct charbuf method, url, ver;
+    int c;
+    
+    req = NULL;
+    bufinit(method);
+    bufinit(url);
+    bufinit(ver);
+    while(1) {
+	c = getc(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 = getc(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 = getc(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(parseheaders(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 struct hthead *parseresp(FILE *in)
+{
+    struct hthead *req;
+    int code;
+    struct charbuf ver, msg;
+    int c;
+    
+    req = NULL;
+    bufinit(ver);
+    bufinit(msg);
+    code = 0;
+    while(1) {
+	c = getc(in);
+	if(c == ' ') {
+	    break;
+	} else if((c == EOF) || (c < 32) || (c >= 128)) {
+	    goto fail;
+	} else {
+	    bufadd(ver, c);
+	}
+    }
+    while(1) {
+	c = getc(in);
+	if(c == ' ') {
+	    break;
+	} else if((c == EOF) || (c < '0') || (c > '9')) {
+	    goto fail;
+	} else {
+	    code = (code * 10) + (c - '0');
+	}
+    }
+    while(1) {
+	c = getc(in);
+	if(c == 10) {
+	    break;
+	} else if(c == 13) {
+	} else if((c == EOF) || (c < 32)) {
+	    goto fail;
+	} else {
+	    bufadd(msg, c);
+	}
+    }
+    bufadd(msg, 0);
+    bufadd(ver, 0);
+    req = mkresp(code, msg.b, ver.b);
+    if(parseheaders(req, in))
+	goto fail;
+    goto out;
+    
+fail:
+    if(req != NULL) {
+	freehthead(req);
+	req = NULL;
+    }
+out:
+    buffree(msg);
+    buffree(ver);
+    return(req);
+}
+
+static off_t passdata(FILE *in, FILE *out, off_t max)
+{
+    size_t read;
+    off_t total;
+    char buf[8192];
+    
+    total = 0;
+    while(!feof(in) && ((max < 0) || (total < max))) {
+	read = sizeof(buf);
+	if(max >= 0)
+	    read = min(max - total, read);
+	read = fread(buf, 1, read, in);
+	if(ferror(in))
+	    return(-1);
+	if(fwrite(buf, 1, read, out) != read)
+	    return(-1);
+	total += read;
+    }
+    return(total);
+}
+
+static int passchunks(FILE *in, FILE *out)
+{
+    char buf[8192];
+    size_t read;
+    
+    do {
+	read = fread(buf, 1, sizeof(buf), in);
+	if(ferror(in))
+	    return(-1);
+	fprintf(out, "%zx\r\n", read);
+	if(fwrite(buf, 1, read, out) != read)
+	    return(-1);
+	fprintf(out, "\r\n");
+    } while(read > 0);
+    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));
+}
+
+void serve(FILE *in, struct conn *conn)
+{
+    int pfds[2];
+    FILE *out;
+    struct hthead *req, *resp;
+    char *hd, *p;
+    off_t dlen;
+    
+    out = NULL;
+    req = resp = NULL;
+    while(1) {
+	if((req = parsereq(in)) == NULL)
+	    break;
+	replrest(req, req->url);
+	if(req->rest[0] == '/')
+	    replrest(req, req->rest + 1);
+	if((p = strchr(req->rest, '?')) != NULL)
+	    *p = 0;
+	
+	if((conn->initreq != NULL) && conn->initreq(conn, req))
+	    break;
+	
+	if(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 = mtstdopen(pfds[1], 1, 600, "r+");
+
+	if((hd = getheader(req, "content-length")) != NULL) {
+	    dlen = atoo(hd);
+	    if(dlen > 0) {
+		if(passdata(in, out, dlen) != dlen)
+		    break;
+	    }
+	}
+	if(fflush(out))
+	    break;
+	/* Make sure to send EOF */
+	shutdown(pfds[1], SHUT_WR);
+	
+	if((resp = parseresp(out)) == NULL)
+	    break;
+	replstr(&resp->ver, req->ver);
+	
+	if(!getheader(resp, "server"))
+	    headappheader(resp, "Server", sprintf3("ashd/%s", VERSION));
+
+	if(!strcmp(req->ver, "HTTP/1.0")) {
+	    writeresp(in, resp);
+	    fprintf(in, "\r\n");
+	    if(!strcasecmp(req->method, "head")) {
+		if(!hasheader(req, "connection", "keep-alive"))
+		    break;
+	    } else if((hd = getheader(resp, "content-length")) != NULL) {
+		dlen = atoo(hd);
+		if(passdata(out, in, dlen) != dlen)
+		    break;
+		if(!hasheader(req, "connection", "keep-alive"))
+		    break;
+	    } else {
+		passdata(out, in, -1);
+		break;
+	    }
+	    if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
+		break;
+	} else if(!strcmp(req->ver, "HTTP/1.1")) {
+	    if(!strcasecmp(req->method, "head")) {
+		writeresp(in, resp);
+		fprintf(in, "\r\n");
+	    } else if((hd = getheader(resp, "content-length")) != NULL) {
+		writeresp(in, resp);
+		fprintf(in, "\r\n");
+		dlen = atoo(hd);
+		if(passdata(out, in, dlen) != dlen)
+		    break;
+	    } else if(!getheader(resp, "transfer-encoding")) {
+		headappheader(resp, "Transfer-Encoding", "chunked");
+		writeresp(in, resp);
+		fprintf(in, "\r\n");
+		if(passchunks(out, in))
+		    break;
+	    } else {
+		writeresp(in, resp);
+		fprintf(in, "\r\n");
+		passdata(out, in, -1);
+		break;
+	    }
+	    if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
+		break;
+	} else {
+	    break;
+	}
+
+	fclose(out);
+	out = NULL;
+	freehthead(req);
+	freehthead(resp);
+	req = resp = NULL;
+    }
+    
+    if(out != NULL)
+	fclose(out);
+    if(req != NULL)
+	freehthead(req);
+    if(resp != NULL)
+	freehthead(resp);
+    fclose(in);
+}
+
+static void plexwatch(struct muth *muth, va_list args)
+{
+    vavar(int, fd);
+    char *buf;
+    int ret;
+    
+    while(1) {
+	block(fd, EV_READ, 0);
+	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) {
+	    exit(0);
+	}
+	/* Maybe I'd like to implement some protocol in this direction
+	 * some day... */
+	free(buf);
+    }
+}
+
+static void initroot(void *uu)
+{
+    int fd;
+    
+    if(daemonize) {
+	setsid();
+	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);
+}
 
 int main(int argc, char **argv)
 {
+    int c;
+    int i, s1;
+    char *root;
+    FILE *pidout;
+    struct passwd *pwent;
+    
+    daemonize = usesyslog = 0;
+    root = 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((pwent = getpwnam(optarg)) == NULL) {
+		flog(LOG_ERR, "could not find user %s", optarg);
+		exit(1);
+	    }
+	    break;
+	case 'r':
+	    root = optarg;
+	    break;
+	case 'p':
+	    pidfile = optarg;
+	    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);
+    }
+    mustart(plexwatch, plex);
+    pidout = NULL;
+    if(pidfile != NULL) {
+	if((pidout = fopen(pidfile, "w")) == NULL) {
+	    flog(LOG_ERR, "could not open %s for writing: %s", pidfile, strerror(errno));
+	    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);
+    if(daemonize) {
+	daemon(0, 0);
+    }
+    if(pidout != NULL) {
+	fprintf(pidout, "%i\n", getpid());
+	fclose(pidout);
+    }
+    ioloop();
+    return(0);
 }