+#include <mt.h>
+#include <mtio.h>
+#include <log.h>
+#include <req.h>
+#include <proc.h>
+
+#include "htparser.h"
+
+static int plex;
+
+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) && ((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(!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 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 usage(FILE *out)
+{
+ fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] PORTSPEC... -- ROOT [ARGS...]\n");
+ fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
+ fprintf(out, "\tavailable handlers are `plain'.\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);
+ } else {
+ flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
+ exit(1);
+ }
+
+ buffree(pars);
+ buffree(vals);
+}