#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 char *pidfile = NULL;
+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;
+ 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);
+ }
+ bufadd(listeners, 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);
+ signal(SIGCHLD, SIG_IGN);
+ signal(SIGINT, sighandler);
+ signal(SIGTERM, sighandler);
+ if(daemonize) {
+ daemon(0, 0);
+ }
+ if(pidout != NULL) {
+ fprintf(pidout, "%i\n", getpid());
+ fclose(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");
+ } else {
+ d = 1;
+ }
+ break;
+ }
+ }
+ return(0);
}