First version of multi listen. - geomyidae - A small C-based gopherd.
(HTM) git clone git://bitreich.org/geomyidae/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/geomyidae/
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---
(DIR) commit 60f33bbe3b6c58d451dad69933c1eb8b36cf3997
(DIR) parent 3c940036398f0c5cb4b3822cb6f8ea1a76e2c968
(HTM) Author: Christoph Lohmann <20h@r-36.net>
Date: Sun, 11 Nov 2018 13:02:32 +0100
First version of multi listen.
Diffstat:
M main.c | 212 +++++++++++++++++++++++--------
1 file changed, 156 insertions(+), 56 deletions(-)
---
(DIR) diff --git a/main.c b/main.c
@@ -24,6 +24,8 @@
#include <errno.h>
#include <arpa/inet.h>
#include <limits.h>
+#include <sys/select.h>
+#include <sys/time.h>
#include "ind.h"
#include "handlr.h"
@@ -40,7 +42,8 @@ enum {
int glfd = -1;
int loglvl = 15;
-int listfd = -1;
+int *listfds = NULL;
+int nlistfds = 0;
int revlookup = 1;
char *logfile = NULL;
@@ -253,6 +256,8 @@ handlerequest(int sock, char *base, char *ohost, char *port, char *clienth,
void
sighandler(int sig)
{
+ int i;
+
switch (sig) {
case SIGCHLD:
while (waitpid(-1, NULL, WNOHANG) > 0);
@@ -266,9 +271,13 @@ sighandler(int sig)
close(glfd);
glfd = -1;
}
- if (listfd >= 0) {
- shutdown(listfd, SHUT_RDWR);
- close(listfd);
+ if (listfds != NULL) {
+ for (i = 0; i < nlistfds; i++) {
+ if (listfds[i] >= 0) {
+ shutdown(listfds[i], SHUT_RDWR);
+ close(listfds[i]);
+ }
+ }
}
exit(0);
break;
@@ -295,60 +304,89 @@ initsignals(void)
* TODO: Move Linux and BSD to Plan 9 socket and bind handling, so we do not
* need the inconsistent return and exit on getaddrinfo.
*/
-int
-getlistenfd(struct addrinfo *hints, char *bindip, char *port)
+int *
+getlistenfd(struct addrinfo *hints, char *bindip, char *port, int *rlfdnum)
{
char addstr[INET6_ADDRSTRLEN];
struct addrinfo *ai, *rp;
void *sinaddr;
- int on, listenfd, aierr, errno_save;
+ int on, *listenfds, *listenfd, aierr, errno_save;
if ((aierr = getaddrinfo(bindip, port, hints, &ai)) || ai == NULL) {
fprintf(stderr, "getaddrinfo (%s:%s): %s\n", bindip, port,
- gai_strerror(aierr));
+ gai_strerror(aierr));
exit(1);
}
- listenfd = -1;
+ *rlfdnum = 0;
+ listenfds = NULL;
on = 1;
for (rp = ai; rp != NULL; rp = rp->ai_next) {
- listenfd = socket(rp->ai_family, rp->ai_socktype,
+ printf("getaddrinfo result: %s:%d\n", rp->ai_canonname,
+ rp->ai_protocol);
+ listenfds = xrealloc(listenfds,
+ sizeof(*listenfds) * (++*rlfdnum));
+ listenfd = &listenfds[*rlfdnum-1];
+
+ *listenfd = socket(rp->ai_family, rp->ai_socktype,
rp->ai_protocol);
- if (listenfd < 0)
+ printf("*listenfd = %d\n", *listenfd);
+ if (*listenfd < 0)
+ continue;
+ if (setsockopt(*listenfd, SOL_SOCKET, SO_REUSEADDR, &on,
+ sizeof(on)) < 0) {
+ printf("setsockopt failed\n");
+ close(*listenfd);
+ (*rlfdnum)--;
+ continue;
+ }
+
+ if (rp->ai_family == AF_INET6 && (setsockopt(*listenfd,
+ IPPROTO_IPV6, IPV6_V6ONLY, &on,
+ sizeof(on)) < 0)) {
+ printf("ipv6 only failed\n");
+ close(*listenfd);
+ (*rlfdnum)--;
continue;
- if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on,
- sizeof(on)) < 0) {
- close(listenfd);
- listenfd = -1;
- break;
}
sinaddr = (rp->ai_family == AF_INET) ?
(void *)&((struct sockaddr_in *)rp->ai_addr)->sin_addr :
(void *)&((struct sockaddr_in6 *)rp->ai_addr)->sin6_addr;
- if (bind(listenfd, rp->ai_addr, rp->ai_addrlen) == 0) {
+ if (bind(*listenfd, rp->ai_addr, rp->ai_addrlen) == 0) {
if (loglvl & CONN && inet_ntop(rp->ai_family, sinaddr,
- addstr, sizeof(addstr))) {
+ addstr, sizeof(addstr))) {
+ /* Do not revlookup here. */
+ on = revlookup;
+ revlookup = 0;
logentry(addstr, port, "-", "listening");
+ revlookup = on;
}
- break;
+ continue;
}
/* Save errno, because fprintf in logentry overwrites it. */
errno_save = errno;
- close(listenfd);
+ close(*listenfd);
+ (*rlfdnum)--;
if (loglvl & CONN && inet_ntop(rp->ai_family, sinaddr,
- addstr, sizeof(addstr))) {
+ addstr, sizeof(addstr))) {
+ /* Do not revlookup here. */
+ on = revlookup;
+ revlookup = 0;
logentry(addstr, port, "-", "could not bind");
+ revlookup = on;
}
errno = errno_save;
}
freeaddrinfo(ai);
- if (rp == NULL)
- return -1;
+ if (*rlfdnum < 1) {
+ free(listenfds);
+ return NULL;
+ }
- return listenfd;
+ return listenfds;
}
void
@@ -367,11 +405,13 @@ main(int argc, char *argv[])
struct addrinfo hints;
struct sockaddr_storage clt;
socklen_t cltlen;
- int sock, dofork, inetf, usechroot, nocgi, errno_save;
+ int sock, dofork, inetf, usechroot, nocgi, errno_save, nbindips, i, j,
+ nlfdret, *lfdret, listfd, maxlfd;
char *port, *base, clienth[NI_MAXHOST], clientp[NI_MAXSERV];
- char *user, *group, *bindip, *ohost, *sport, *p;
+ char *user, *group, **bindips, *ohost, *sport, *p;
struct passwd *us;
struct group *gr;
+ fd_set rfd;
base = stdbase;
port = stdport;
@@ -380,7 +420,8 @@ main(int argc, char *argv[])
group = NULL;
us = NULL;
gr = NULL;
- bindip = NULL;
+ bindips = NULL;
+ nbindips = 0;
ohost = NULL;
sport = NULL;
inetf = AF_UNSPEC;
@@ -424,7 +465,8 @@ main(int argc, char *argv[])
group = EARGF(usage());
break;
case 'i':
- bindip = EARGF(usage());
+ bindips = xrealloc(bindips, sizeof(*bindips) * (++nbindips));
+ bindips[nbindips-1] = EARGF(usage());
break;
case 'h':
ohost = EARGF(usage());
@@ -502,34 +544,50 @@ main(int argc, char *argv[])
glfd = 1;
}
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = inetf;
- hints.ai_flags = AI_PASSIVE;
- hints.ai_socktype = SOCK_STREAM;
- if (bindip)
- hints.ai_flags |= AI_CANONNAME;
-
- if ((listfd = getlistenfd(&hints, bindip, port)) < 0) {
- if (inetf == AF_UNSPEC) {
- hints.ai_family = AF_INET;
- listfd = getlistenfd(&hints, bindip, port);
- }
- /* Save errno because of fprintf to stderr. */
- errno_save = errno;
- }
- if (listfd < 0) {
- fprintf(stderr, "Unable to get a binding socket. "
- "Look at bindip and the tcp port.\n");
- errno = errno_save;
- perror("getlistenfd");
- return 1;
+ if (bindips == NULL) {
+ bindips = xrealloc(bindips, sizeof(*bindips) * (++nbindips));
+ bindips[nbindips-1] = "0.0.0.0";
+ bindips = xrealloc(bindips, sizeof(*bindips) * (++nbindips));
+ bindips[nbindips-1] = "::";
}
- if (listen(listfd, 255)) {
- perror("listen");
- close(listfd);
- return 1;
+ for (i = 0; i < nbindips; i++) {
+ printf("binding %s:%s\n", bindips[i], port);
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = inetf;
+ hints.ai_flags = AI_PASSIVE;
+ hints.ai_socktype = SOCK_STREAM;
+ if (bindips[i])
+ hints.ai_flags |= AI_CANONNAME;
+
+ nlfdret = 0;
+ lfdret = getlistenfd(&hints, bindips[i], port, &nlfdret);
+ if (nlfdret < 1) {
+ errno_save = errno;
+ fprintf(stderr, "Unable to get a binding socket for "
+ "%s:%s\n", bindips[i], port);
+ errno = errno_save;
+ perror("getlistenfd");
+ }
+
+ printf("nlfdret = %d\n", nlfdret);
+ for (j = 0; j < nlfdret; j++) {
+ printf("lfdret[%d] = %d\n", j, lfdret[j]);
+ if (listen(lfdret[j], 255) < 0) {
+ perror("listen");
+ close(lfdret[j]);
+ continue;
+ }
+ listfds = xrealloc(listfds,
+ sizeof(*listfds) * ++nlistfds);
+ listfds[nlistfds-1] = lfdret[j];
+ }
+ if (lfdret != NULL)
+ free(lfdret);
}
+ if (nlistfds < 1)
+ return 1;
if (usechroot) {
if (chdir(base) < 0) {
@@ -552,7 +610,15 @@ main(int argc, char *argv[])
if (dropprivileges(gr, us) < 0) {
perror("dropprivileges");
- close(listfd);
+ if (listfds != NULL) {
+ for (i = 0; i < nlistfds; i++) {
+ if (listfds[i] >= 0) {
+ shutdown(listfds[i], SHUT_RDWR);
+ close(listfds[i]);
+ }
+ }
+ free(listfds);
+ }
return 1;
}
@@ -569,7 +635,34 @@ main(int argc, char *argv[])
#endif /* __OpenBSD__ */
while (1) {
+ FD_ZERO(&rfd);
+ maxlfd = 0;
+ for (i = 0; i < nlistfds; i++) {
+ FD_SET(listfds[i], &rfd);
+ if (listfds[i] > maxlfd)
+ maxlfd = listfds[i];
+ }
+
+ printf("pselect\n");
+ if (pselect(maxlfd+1, &rfd, NULL, NULL, NULL, NULL) < 0) {
+ if (errno == EINTR)
+ continue;
+ perror("pselect");
+ break;
+ }
+
+ listfd = -1;
+ for (i = 0; i < nlistfds; i++) {
+ if (FD_ISSET(listfds[i], &rfd)) {
+ listfd = listfds[i];
+ break;
+ }
+ }
+ if (listfd < 0)
+ continue;
+
cltlen = sizeof(clt);
+ printf("accept on %d\n", listfd);
sock = accept(listfd, (struct sockaddr *)&clt, &cltlen);
if (sock < 0) {
switch (errno) {
@@ -638,8 +731,15 @@ main(int argc, char *argv[])
close(sock);
}
- shutdown(listfd, SHUT_RDWR);
- close(listfd);
+ if (listfds != NULL) {
+ for (i = 0; i < nlistfds; i++) {
+ if (listfds[i] >= 0) {
+ shutdown(listfds[i], SHUT_RDWR);
+ close(listfds[i]);
+ }
+ }
+ free(listfds);
+ }
if (logfile != NULL && glfd != -1) {
close(glfd);
glfd = -1;