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main.c
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/*
* Copy me if you can.
* by 20h
*/
#include <unistd.h>
#include <dirent.h>
#include <memory.h>
#include <netdb.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <sys/time.h>
#ifdef ENABLE_TLS
#include <tls.h>
#endif /* ENABLE_TLS */
#include "ind.h"
#include "handlr.h"
#include "arg.h"
enum {
NOLOG = 0,
FILES = 1,
DIRS = 2,
HTTP = 4,
ERRORS = 8,
CONN = 16,
GPLUS = 32
};
int glfd = -1;
int loglvl = 47;
int *listfds = NULL;
int nlistfds = 0;
int revlookup = 1;
char *logfile = NULL;
char *argv0;
char stdbase[] = "/var/gopher";
char *stdport = "70";
char *indexf[] = {"/index.gph", "/index.cgi", "/index.dcgi", "/index.bin"};
char *nocgierr = "3Sorry, execution of the token '%s' was requested, but this "
"is disabled in the server configuration.\tErr"
"\tlocalhost\t70\r\n";
char *notfounderr = "3Sorry, but the requested token '%s' could not be found.\tErr"
"\tlocalhost\t70\r\n";
char *htredir = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
" \"DTD/xhtml-transitional.dtd\">\n"
"<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en\">\n"
" <head>\n"
" <title>gopher redirect</title>\n"
"\n"
" <meta http-equiv=\"Refresh\" content=\"1;url=%s\" />\n"
" </head>\n"
" <body>\n"
" This page is for redirecting you to: <a href=\"%s\">%s</a>.\n"
" </body>\n"
"</html>\n";
char *selinval ="3Happy helping ☃ here: "
"Sorry, your selector does not start with / or contains '..'. "
"That's illegal here.\tErr\tlocalhost\t70\r\n.\r\n\r\n";
int
dropprivileges(struct group *gr, struct passwd *pw)
{
if (gr != NULL)
if (setgroups(1, &gr->gr_gid) != 0 || setgid(gr->gr_gid) != 0)
return -1;
if (pw != NULL) {
if (gr == NULL) {
if (setgroups(1, &pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0)
return -1;
}
if (setuid(pw->pw_uid) != 0)
return -1;
}
return 0;
}
void
logentry(char *host, char *port, char *qry, char *status)
{
time_t tim;
struct tm *ptr;
char timstr[128], *ahost;
if (glfd >= 0) {
tim = time(0);
ptr = gmtime(&tim);
ahost = revlookup ? reverselookup(host) : host;
strftime(timstr, sizeof(timstr), "%F %T %z", ptr);
dprintf(glfd, "[%s|%s|%s|%s] %s\n",
timstr, ahost, port, status, qry);
if (revlookup)
free(ahost);
}
return;
}
void
handlerequest(int sock, char *req, int rlen, char *base, char *ohost,
char *port, char *clienth, char *clientp, int nocgi,
int istls)
{
struct stat dir;
char recvc[1025], recvb[1025], path[1025], *args = NULL, *sear, *c;
int len = 0, fd, i, maxrecv;
filetype *type;
memset(&dir, 0, sizeof(dir));
memset(recvb, 0, sizeof(recvb));
memset(recvc, 0, sizeof(recvc));
maxrecv = sizeof(recvb) - 1;
if (rlen > maxrecv || rlen < 0)
return;
memcpy(recvb, req, rlen);
c = strchr(recvb, '\r');
if (c)
c[0] = '\0';
c = strchr(recvb, '\n');
if (c)
c[0] = '\0';
sear = strchr(recvb, '\t');
if (sear != NULL) {
*sear++ = '\0';
/*
* This is a compatibility layer to geomyidae for users using
* the original gopher(1) client. Gopher+ is by default
* requesting the metadata. We are using a trick in the
* gopher(1) parsing code to jump back to gopher compatibility
* mode. DO NOT ADD ANY OTHER GOPHER+ SUPPORT. GOPHER+ IS
* CRAP.
*/
if (*sear == '+' || *sear == '$' || *sear == '!' || *sear == '\0') {
if (loglvl & GPLUS)
logentry(clienth, clientp, recvb, "gopher+ redirect");
dprintf(sock, "+-2\r\n");
dprintf(sock, "+INFO: 1gopher+\t\t%s\t%s\r\n",
ohost, port);
dprintf(sock, "+ADMIN:\r\n Admin: Me\r\n");
return;
}
}
memmove(recvc, recvb, rlen+1);
if (!strncmp(recvb, "URL:", 4)) {
len = snprintf(path, sizeof(path), htredir,
recvb + 4, recvb + 4, recvb + 4);
if (len > sizeof(path))
len = sizeof(path);
write(sock, path, len);
if (loglvl & HTTP)
logentry(clienth, clientp, recvc, "HTTP redirect");
return;
}
/*
* Valid cases in gopher we overwrite here, but could be used for
* other geomyidae features:
*
* request string = "?..." -> "/?..."
* request string = "" -> "/"
* request string = "somestring" -> "/somestring"
*
* Be careful, when you consider those special cases to be used
* for some feature. You can easily do good and bad.
*/
args = strchr(recvb, '?');
if (args != NULL)
*args++ = '\0';
if (recvb[0] == '\0') {
recvb[0] = '/';
recvb[1] = '\0';
}
if (recvb[0] != '/' || strstr(recvb, "..")){
dprintf(sock, "%s", selinval);
return;
}
snprintf(path, sizeof(path), "%s%s", base, recvb);
fd = -1;
if (stat(path, &dir) != -1 && S_ISDIR(dir.st_mode)) {
for (i = 0; i < sizeof(indexf)/sizeof(indexf[0]); i++) {
if (strlen(path) + strlen(indexf[i]) >= sizeof(path)) {
if (loglvl & ERRORS)
logentry(clienth, clientp, recvc,
"path truncation occurred");
return;
}
strncat(path, indexf[i], sizeof(path) - strlen(path) - 1);
fd = open(path, O_RDONLY);
if (fd >= 0)
break;
path[strlen(path)-strlen(indexf[i])] = '\0';
}
} else {
fd = open(path, O_RDONLY);
if (fd < 0) {
dprintf(sock, notfounderr, recvc);
if (loglvl & ERRORS)
logentry(clienth, clientp, recvc, strerror(errno));
return;
}
}
if (fd >= 0) {
close(fd);
if (loglvl & FILES)
logentry(clienth, clientp, recvc, "serving");
c = strrchr(path, '/');
if (c == NULL)
c = path;
type = gettype(c);
if (nocgi && (type->f == handledcgi || type->f == handlecgi)) {
dprintf(sock, nocgierr, recvc);
if (loglvl & ERRORS)
logentry(clienth, clientp, recvc, "nocgi error");
} else {
type->f(sock, path, port, base, args, sear, ohost,
clienth, istls);
}
} else {
if (S_ISDIR(dir.st_mode)) {
handledir(sock, path, port, base, args, sear, ohost,
clienth, istls);
if (loglvl & DIRS) {
logentry(clienth, clientp, recvc,
"dir listing");
}
return;
}
dprintf(sock, notfounderr, recvc);
if (loglvl & ERRORS)
logentry(clienth, clientp, recvc, "not found");
}
return;
}
void
sighandler(int sig)
{
int i;
switch (sig) {
case SIGCHLD:
while (waitpid(-1, NULL, WNOHANG) > 0);
break;
case SIGINT:
case SIGQUIT:
case SIGABRT:
case SIGTERM:
case SIGKILL:
if (logfile != NULL && glfd != -1) {
close(glfd);
glfd = -1;
}
for (i = 0; i < nlistfds; i++) {
shutdown(listfds[i], SHUT_RDWR);
close(listfds[i]);
}
free(listfds);
exit(0);
break;
default:
break;
}
}
void
initsignals(void)
{
signal(SIGCHLD, sighandler);
signal(SIGHUP, sighandler);
signal(SIGINT, sighandler);
signal(SIGQUIT, sighandler);
signal(SIGABRT, sighandler);
signal(SIGTERM, sighandler);
signal(SIGKILL, sighandler);
signal(SIGPIPE, SIG_IGN);
}
/*
* 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 *rlfdnum)
{
char addstr[INET6_ADDRSTRLEN];
struct addrinfo *ai, *rp;
void *sinaddr;
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));
exit(1);
}
*rlfdnum = 0;
listenfds = NULL;
on = 1;
for (rp = ai; rp != NULL; rp = rp->ai_next) {
listenfds = xrealloc(listenfds,
sizeof(*listenfds) * (++*rlfdnum));
listenfd = &listenfds[*rlfdnum-1];
*listenfd = socket(rp->ai_family, rp->ai_socktype,
rp->ai_protocol);
if (*listenfd < 0)
continue;
if (setsockopt(*listenfd, SOL_SOCKET, SO_REUSEADDR, &on,
sizeof(on)) < 0) {
close(*listenfd);
(*rlfdnum)--;
continue;
}
if (rp->ai_family == AF_INET6 && (setsockopt(*listenfd,
IPPROTO_IPV6, IPV6_V6ONLY, &on,
sizeof(on)) < 0)) {
close(*listenfd);
(*rlfdnum)--;
continue;
}
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 (loglvl & CONN && inet_ntop(rp->ai_family, sinaddr,
addstr, sizeof(addstr))) {
/* Do not revlookup here. */
on = revlookup;
revlookup = 0;
logentry(addstr, port, "-", "listening");
revlookup = on;
}
continue;
}
/* Save errno, because fprintf in logentry overwrites it. */
errno_save = errno;
close(*listenfd);
(*rlfdnum)--;
if (loglvl & CONN && inet_ntop(rp->ai_family, sinaddr,
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 (*rlfdnum < 1) {
free(listenfds);
return NULL;
}
return listenfds;
}
void
usage(void)
{
dprintf(2, "usage: %s [-46cden] [-l logfile] "
#ifdef ENABLE_TLS
"[-t keyfile certfile] "
#endif /* ENABLE_TLS */
"[-v loglvl] [-b base] [-p port] [-o sport] "
"[-u user] [-g group] [-h host] [-i interface ...]\n",
argv0);
exit(1);
}
int
main(int argc, char *argv[])
{
struct addrinfo hints;
struct sockaddr_storage clt;
struct linger lingerie;
socklen_t cltlen;
int sock, dofork = 1, inetf = AF_UNSPEC, usechroot = 0,
nocgi = 0, errno_save, nbindips = 0, i, j,
nlfdret, *lfdret, listfd, maxlfd, istls = 0,
#ifdef ENABLE_TLS
dotls = 0, tlspipe[2], shufbuf[1025],
shuflen, wlen, shufpos,
#endif /* ENABLE_TLS */
maxrecv, retl,
rlen = 0;
fd_set rfd;
char *port, *base, clienth[NI_MAXHOST], clientp[NI_MAXSERV],
*user = NULL, *group = NULL, **bindips = NULL,
*ohost = NULL, *sport = NULL, *p,
#ifdef ENABLE_TLS
*certfile = NULL, *keyfile = NULL,
#endif /* ENABLE_TLS */
byte0, recvb[1025];
struct passwd *us = NULL;
struct group *gr = NULL;
#ifdef ENABLE_TLS
struct tls_config *tlsconfig = NULL;
struct tls *tlsctx = NULL, *tlsclientctx;
#endif /* ENABLE_TLS */
base = stdbase;
port = stdport;
ARGBEGIN {
case '4':
inetf = AF_INET;
break;
case '6':
inetf = AF_INET6;
break;
case 'b':
base = EARGF(usage());
break;
case 'c':
usechroot = 1;
break;
case 'p':
port = EARGF(usage());
if (sport == NULL)
sport = port;
break;
case 'l':
logfile = EARGF(usage());
break;
case 'd':
dofork = 0;
break;
case 'e':
nocgi = 1;
break;
case 'v':
loglvl = atoi(EARGF(usage()));
break;
case 'u':
user = EARGF(usage());
break;
case 'g':
group = EARGF(usage());
break;
case 'i':
bindips = xrealloc(bindips, sizeof(*bindips) * (++nbindips));
bindips[nbindips-1] = EARGF(usage());
break;
case 'h':
ohost = EARGF(usage());
break;
case 'o':
sport = EARGF(usage());
break;
case 'n':
revlookup = 0;
break;
#ifdef ENABLE_TLS
case 't':
dotls = 1;
keyfile = EARGF(usage());
certfile = EARGF(usage());
break;
#endif /* ENABLE_TLS */
default:
usage();
} ARGEND;
if (sport == NULL)
sport = port;
if (argc != 0)
usage();
#ifdef ENABLE_TLS
if (dotls) {
if (tls_init() < 0) {
perror("tls_init");
return 1;
}
if ((tlsconfig = tls_config_new()) == NULL) {
perror("tls_config_new");
return 1;
}
if ((tlsctx = tls_server()) == NULL) {
perror("tls_server");
return 1;
}
if (tls_config_set_key_file(tlsconfig, keyfile) < 0) {
perror("tls_config_set_key_file");
return 1;
}
if (tls_config_set_cert_file(tlsconfig, certfile) < 0) {
perror("tls_config_set_cert_file");
return 1;
}
if (tls_configure(tlsctx, tlsconfig) < 0) {
perror("tls_configure");
return 1;
}
}
#endif /* ENABLE_TLS */
if (ohost == NULL) {
/* Do not use HOST_NAME_MAX, it is not defined on NetBSD. */
ohost = xcalloc(1, 256+1);
if (gethostname(ohost, 256) < 0) {
perror("gethostname");
free(ohost);
return 1;
}
} else {
ohost = xstrdup(ohost);
}
if (group != NULL) {
errno = 0;
if ((gr = getgrnam(group)) == NULL) {
if (errno == 0) {
fprintf(stderr, "no such group '%s'\n", group);
} else {
perror("getgrnam");
}
return 1;
}
}
if (user != NULL) {
errno = 0;
if ((us = getpwnam(user)) == NULL) {
if (errno == 0) {
fprintf(stderr, "no such user '%s'\n", user);
} else {
perror("getpwnam");
}
return 1;
}
}
if (dofork) {
switch (fork()) {
case -1:
perror("fork");
return 1;
case 0:
break;
default:
return 0;
}
}
if (logfile != NULL) {
glfd = open(logfile, O_APPEND | O_WRONLY | O_CREAT, 0644);
if (glfd < 0) {
perror("log");
return 1;
}
} else if (!dofork) {
glfd = 1;
}
if (bindips == NULL) {
if (inetf == AF_INET || inetf == AF_UNSPEC) {
bindips = xrealloc(bindips, sizeof(*bindips) * (++nbindips));
bindips[nbindips-1] = "0.0.0.0";
}
if (inetf == AF_INET6 || inetf == AF_UNSPEC) {
bindips = xrealloc(bindips, sizeof(*bindips) * (++nbindips));
bindips[nbindips-1] = "::";
}
}
for (i = 0; i < nbindips; i++) {
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");
}
for (j = 0; j < nlfdret; j++) {
if (listen(lfdret[j], 255) < 0) {
perror("listen");
close(lfdret[j]);
continue;
}
listfds = xrealloc(listfds,
sizeof(*listfds) * ++nlistfds);
listfds[nlistfds-1] = lfdret[j];
}
free(lfdret);
}
free(bindips);
if (nlistfds < 1)
return 1;
if (usechroot) {
if (chdir(base) < 0) {
perror("chdir");
return 1;
}
base = "";
if (chroot(".") < 0) {
perror("chroot");
return 1;
}
} else if (*base != '/' && !(base = realpath(base, NULL))) {
perror("realpath");
return 1;
}
/* strip / at the end, except if it is "/" */
for (p = base + strlen(base); p > base + 1 && p[-1] == '/'; --p)
p[-1] = '\0';
if (dropprivileges(gr, us) < 0) {
perror("dropprivileges");
for (i = 0; i < nlistfds; i++) {
shutdown(listfds[i], SHUT_RDWR);
close(listfds[i]);
}
free(listfds);
return 1;
}
initsignals();
#ifdef __OpenBSD__
char promises[31]; /* check the size needed in the fork too */
snprintf(promises, sizeof(promises), "rpath inet stdio proc exec %s",
revlookup ? "dns" : "");
if (pledge(promises, NULL) == -1) {
perror("pledge");
exit(1);
}
#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];
}
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);
sock = accept(listfd, (struct sockaddr *)&clt, &cltlen);
if (sock < 0) {
switch (errno) {
case ECONNABORTED:
case EINTR:
continue;
default:
perror("accept");
close(listfd);
return 1;
}
}
if (getnameinfo((struct sockaddr *)&clt, cltlen, clienth,
sizeof(clienth), clientp, sizeof(clientp),
NI_NUMERICHOST|NI_NUMERICSERV)) {
clienth[0] = clientp[0] = '\0';
}
if (!strncmp(clienth, "::ffff:", 7))
memmove(clienth, clienth+7, strlen(clienth)-6);
if (loglvl & CONN)
logentry(clienth, clientp, "-", "connected");
switch (fork()) {
case -1:
perror("fork");
shutdown(sock, SHUT_RDWR);
break;
case 0:
close(listfd);
signal(SIGHUP, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGALRM, SIG_DFL);
#ifdef __OpenBSD__
snprintf(promises, sizeof(promises),
"rpath inet stdio %s %s",
nocgi ? "" : "proc exec",
revlookup ? "dns" : "");
if (pledge(promises, NULL) == -1) {
perror("pledge");
exit(1);
}
#endif /* __OpenBSD__ */
if (recv(sock, &byte0, 1, MSG_PEEK) < 1)
return 1;
#ifdef ENABLE_TLS
/*
* First byte is 0x16 == 22, which is the TLS
* Handshake first byte.
*/
istls = 0;
if (byte0 == 0x16 && dotls) {
istls = 1;
if (tls_accept_socket(tlsctx, &tlsclientctx, sock) < 0)
return 1;
if (tls_handshake(tlsclientctx) < 0)
return 1;
}
#else /* ENABLE_TLS */
/*
* Some TLS request. Help them determine we only
* serve plaintext.
*/
if (byte0 == 0x16) {
if (loglvl & CONN) {
logentry(clienth, clientp, "-",
"disconnected");
}
shutdown(sock, SHUT_RDWR);
close(sock);
return 1;
}
#endif /* ENABLE_TLS */
maxrecv = sizeof(recvb) - 1;
do {
#ifdef ENABLE_TLS
if (istls) {
retl = tls_read(tlsclientctx,
recvb+rlen, sizeof(recvb)-1-rlen);
if (retl < 0)
fprintf(stderr, "tls_read failed: %s\n", tls_error(tlsclientctx));
} else
#endif /* ENABLE_TLS */
{
retl = read(sock, recvb+rlen,
sizeof(recvb)-1-rlen);
if (retl < 0)
perror("read");
}
if (retl <= 0)
break;
rlen += retl;
} while (recvb[rlen-1] != '\n'
&& --maxrecv > 0);
if (rlen <= 0)
return 1;
#ifdef ENABLE_TLS
if (istls) {
if (pipe(tlspipe) < 0) {
perror("tls_pipe");
return 1;
}
switch(fork()) {
case 0:
sock = tlspipe[1];
close(tlspipe[0]);
break;
case -1:
perror("fork");
return 1;
default:
close(tlspipe[1]);
do {
shuflen = read(tlspipe[0], shufbuf, sizeof(shufbuf)-1);
if (shuflen == -1 && errno == EINTR)
continue;
for (shufpos = 0; shufpos < shuflen; shufpos += wlen) {
wlen = tls_write(tlsclientctx, shufbuf+shufpos, shuflen-shufpos);
if (wlen < 0) {
fprintf(stderr, "tls_write failed: %s\n", tls_error(tlsclientctx));
return 1;
}
}
} while(shuflen > 0);
tls_close(tlsclientctx);
tls_free(tlsclientctx);
close(tlspipe[0]);
waitforpendingbytes(sock);
shutdown(sock, SHUT_RDWR);
close(sock);
return 0;
}
}
#endif /* ENABLE_TLS */
handlerequest(sock, recvb, rlen, base,
ohost, sport, clienth,
clientp, nocgi, istls);
if (!istls) {
/*
* On close only wait for at maximum 60
* seconds for all data to be transmitted
* before forcefully closing the
* connection.
*/
lingerie.l_onoff = 1;
lingerie.l_linger = 60;
setsockopt(sock, SOL_SOCKET, SO_LINGER,
&lingerie, sizeof(lingerie));
/*
* Force explict flush of buffers using
* TCP_NODELAY.
*/
j = 1;
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
&j, sizeof(int));
waitforpendingbytes(sock);
j = 0;
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
&j, sizeof(int));
shutdown(sock, SHUT_RDWR);
}
close(sock);
if (loglvl & CONN) {
logentry(clienth, clientp, "-",
"disconnected");
}
return 0;
default:
break;
}
close(sock);
}
if (logfile != NULL && glfd != -1) {
close(glfd);
glfd = -1;
}
free(ohost);
for (i = 0; i < nlistfds; i++) {
shutdown(listfds[i], SHUT_RDWR);
close(listfds[i]);
}
free(listfds);
#ifdef ENABLE_TLS
if (dotls) {
tls_close(tlsctx);
tls_free(tlsctx);
tls_config_free(tlsconfig);
}
#endif /* ENABLE_TLS */
return 0;
}