X-Git-Url: http://dolda2000.com/gitweb/?a=blobdiff_plain;f=src%2Fhtparser.c;h=cec52dc3984d56488ee4fab84540993a1dd33fff;hb=2e535ab038ae310e167ca301fe4d4ffd542ced19;hp=0aa0032bee4634193dca1288666422f75f90d721;hpb=f0bbedf750f1530ec05bf2b8122479c924bbf2fe;p=ashd.git

diff --git a/src/htparser.c b/src/htparser.c
index 0aa0032..cec52dc 100644
--- a/src/htparser.c
+++ b/src/htparser.c
@@ -19,12 +19,421 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.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>
+
+static int plex;
+
+static int listensock4(int port)
+{
+    struct sockaddr_in name;
+    int fd;
+    int valbuf;
+    
+    memset(&name, 0, sizeof(name));
+    name.sin_family = AF_INET;
+    name.sin_port = htons(port);
+    if((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
+	return(-1);
+    valbuf = 1;
+    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &valbuf, sizeof(valbuf));
+    if(bind(fd, (struct sockaddr *)&name, sizeof(name))) {
+	close(fd);
+	return(-1);
+    }
+    if(listen(fd, 16) < 0) {
+	close(fd);
+	return(-1);
+    }
+    return(fd);
+}
+
+static int listensock6(int port)
+{
+    struct sockaddr_in6 name;
+    int fd;
+    int valbuf;
+    
+    memset(&name, 0, sizeof(name));
+    name.sin6_family = AF_INET6;
+    name.sin6_port = htons(port);
+    if((fd = socket(PF_INET6, SOCK_STREAM, 0)) < 0)
+	return(-1);
+    valbuf = 1;
+    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &valbuf, sizeof(valbuf));
+    if(bind(fd, (struct sockaddr *)&name, sizeof(name))) {
+	close(fd);
+	return(-1);
+    }
+    if(listen(fd, 16) < 0) {
+	close(fd);
+	return(-1);
+    }
+    return(fd);
+}
+
+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);
+	}
+    }
+    while(1) {
+	c = getc(in);
+	if(c == ' ') {
+	    break;
+	} else if((c == EOF) || (c < 32)) {
+	    goto fail;
+	} else {
+	    bufadd(url, c);
+	}
+    }
+    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);
+	}
+    }
+    bufadd(method, 0);
+    bufadd(url, 0);
+    bufadd(ver, 0);
+    req = mkreq(method.b, url.b, ver.b);
+    if(parseheaders(req, in))
+	goto fail;
+    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) && (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, "%x\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));
+}
+
+static void serve(struct muth *muth, va_list args)
+{
+    vavar(int, fd);
+    vavar(struct sockaddr_storage, name);
+    int pfds[2];
+    FILE *in, *out;
+    struct hthead *req, *resp;
+    char nmbuf[256];
+    char *hd, *p;
+    off_t dlen;
+    
+    in = mtstdopen(fd, 1, 60, "r+");
+    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(name.ss_family == AF_INET) {
+	    headappheader(req, "X-Ash-Address", inet_ntop(AF_INET, &((struct sockaddr_in *)&name)->sin_addr, nmbuf, sizeof(nmbuf)));
+	    headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&name)->sin_port)));
+	} else if(name.ss_family == AF_INET6) {
+	    headappheader(req, "X-Ash-Address", inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&name)->sin6_addr, nmbuf, sizeof(nmbuf)));
+	    headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&name)->sin6_port)));
+	}
+
+	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);
+	
+	resp = parseresp(out);
+	replstr(&resp->ver, req->ver);
+
+	if(!strcmp(req->ver, "HTTP/1.0")) {
+	    writeresp(in, resp);
+	    fprintf(in, "\r\n");
+	    if((hd = getheader(resp, "content-length")) != NULL) {
+		dlen = passdata(out, in, -1);
+		if(dlen != atoo(hd))
+		    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((hd = getheader(resp, "content-length")) != NULL) {
+		writeresp(in, resp);
+		fprintf(in, "\r\n");
+		dlen = passdata(out, in, -1);
+		if(dlen != atoo(hd))
+		    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 listenloop(struct muth *muth, va_list args)
+{
+    vavar(int, ss);
+    int ns;
+    struct sockaddr_storage name;
+    socklen_t namelen;
+    
+    while(1) {
+	namelen = sizeof(name);
+	block(ss, EV_READ, 0);
+	ns = accept(ss, (struct sockaddr *)&name, &namelen);
+	if(ns < 0) {
+	    flog(LOG_ERR, "accept: %s", strerror(errno));
+	    goto out;
+	}
+	mustart(serve, ns, name);
+    }
+    
+out:
+    close(ss);
+}
+
+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);
+    }
+}
 
 int main(int argc, char **argv)
 {
+    int fd;
+    
+    if(argc < 2) {
+	fprintf(stderr, "usage: htparser ROOT [ARGS...]\n");
+	exit(1);
+    }
+    if((plex = stdmkchild(argv + 1)) < 0) {
+	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
+	return(1);
+    }
+    if((fd = listensock6(8080)) < 0) {
+	flog(LOG_ERR, "could not listen on IPv6: %s", strerror(errno));
+	return(1);
+    }
+    mustart(listenloop, fd);
+    if((fd = listensock4(8080)) < 0) {
+	if(errno != EADDRINUSE) {
+	    flog(LOG_ERR, "could not listen on IPv4: %s", strerror(errno));
+	    return(1);
+	}
+    } else {
+	mustart(listenloop, fd);
+    }
+    mustart(plexwatch, plex);
+    ioloop();
+    return(0);
 }