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Arquivotheca.SunOS-4.1.4/etc/inetd.c
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2021-10-11 18:37:13 -03:00

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/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint
#ifndef lint
static char sccsid[] = "@(#)inetd.c 1.1 94/10/31 SMI"; /* from UCB 5.7 8/19/86 */
#endif not lint
/*
* Inetd - Internet super-server
*
* This program invokes all internet services as needed.
* connection-oriented services are invoked each time a
* connection is made, by creating a process. This process
* is passed the connection as file descriptor 0 and is
* expected to do a getpeername to find out the source host
* and port.
*
* Datagram oriented services are invoked when a datagram
* arrives; a process is created and passed a pending message
* on file descriptor 0. Datagram servers may either connect
* to their peer, freeing up the original socket for inetd
* to receive further messages on, or ``take over the socket'',
* processing all arriving datagrams and, eventually, timing
* out. The first type of server is said to be ``multi-threaded'';
* the second type of server ``single-threaded''.
*
* Inetd uses a configuration file which is read at startup
* and, possibly, at some later time in response to a hangup signal.
* The configuration file is ``free format'' with fields given in the
* order shown below. Continuation lines for an entry must being with
* a space or tab. All fields must be present in each entry.
*
* service name must be in /etc/services
* socket type stream/dgram/raw/rdm/seqpacket
* protocol must be in /etc/protocols
* wait/nowait single-threaded/multi-threaded
* user user to run daemon as
* server program full path name
* server program arguments maximum of MAXARGS (5)
*
* for rpc services:
* service name/version must be in /etc/rpc with version = 1-x
* socket type stream/dgram/raw/rdm/seqpacket
* protocol of the form rpc/protocol
* wait/nowait single-threaded/multi-threaded
* user user to run daemon as
* server program full path name
* server program arguments maximum of MAXARGS (5)
*
* Comment lines are indicated by a `#' in column 1.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <netdb.h>
#include <syslog.h>
#include <pwd.h>
#define TOOMANY 40 /* don't start more than TOOMANY */
#define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
#define RETRYTIME (60*10) /* retry after bind or server fail */
#define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
extern int errno;
void reapchild(), retry(), config();
void termserv();
void unregister();
char *index();
char *malloc();
long strtol();
int debug = 0;
int ndescriptors;
int nsock, maxsock;
fd_set allsock;
int options;
int timingout;
int nservers = 0;
int maxservers;
struct servent *sp;
/*
* Each service requires one file descriptor for the socket we listen on
* for requests for that service. We don't allow more services than
* we can allocate file descriptors for. OTHERDESCRIPTORS is the number
* of descriptors needed for other purposes; this number was determined
* experimentally.
*/
#define OTHERDESCRIPTORS 8
/*
* Additional information carried in various fields:
*
* If "se_wait" is neither 0 nor 1, it's the PID of the server process
* currently running for that service.
* If "se_fd" is -1, it means that the service could not be set up,
* e.g. the entry for that service couldn't be found in "/etc/services".
*/
struct servtab {
char *se_service; /* name of service */
int se_socktype; /* type of socket to use */
char *se_proto; /* protocol used */
char se_isrpc; /* service is RPC-based */
char se_checked; /* looked at during merge */
short se_wait; /* single threaded server */
char *se_user; /* user name to run as */
struct biltin *se_bi; /* if built-in, description */
char *se_server; /* server program */
#define MAXARGV 5
char *se_argv[MAXARGV+1]; /* program arguments */
int se_fd; /* open descriptor */
union {
struct sockaddr_in ctrladdr; /* bound address */
struct {
unsigned prog; /* program number */
unsigned lowvers; /* lowest version supported */
unsigned highvers; /* highest version supported */
} rpcnum;
} se_un;
int se_count; /* number started since se_time */
struct timeval se_time; /* start of se_count */
struct servtab *se_next;
} *servtab;
#define se_ctrladdr se_un.ctrladdr
#define se_rpc se_un.rpcnum
int echo_stream(), discard_stream(), machtime_stream();
int daytime_stream(), chargen_stream();
int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg();
struct biltin {
char *bi_service; /* internally provided service name */
int bi_socktype; /* type of socket supported */
short bi_fork; /* 1 if should fork before call */
short bi_wait; /* 1 if should wait for child */
int (*bi_fn)(); /* function which performs it */
} biltins[] = {
/* Echo received data */
"echo", SOCK_STREAM, 1, 0, echo_stream,
"echo", SOCK_DGRAM, 0, 0, echo_dg,
/* Internet /dev/null */
"discard", SOCK_STREAM, 1, 0, discard_stream,
"discard", SOCK_DGRAM, 0, 0, discard_dg,
/* Return 32 bit time since 1970 */
"time", SOCK_STREAM, 0, 0, machtime_stream,
"time", SOCK_DGRAM, 0, 0, machtime_dg,
/* Return human-readable time */
"daytime", SOCK_STREAM, 0, 0, daytime_stream,
"daytime", SOCK_DGRAM, 0, 0, daytime_dg,
/* Familiar character generator */
"chargen", SOCK_STREAM, 1, 0, chargen_stream,
"chargen", SOCK_DGRAM, 0, 0, chargen_dg,
0
};
#define NUMINT (sizeof(intab) / sizeof(struct inent))
char *CONFIG = "/etc/inetd.conf";
char **Argv;
char *LastArg;
main(argc, argv, envp)
int argc;
char *argv[], *envp[];
{
register struct servtab *sep;
register struct passwd *pwd;
char *cp, buf[50];
int pid, i, dofork;
struct sigvec sv;
struct rlimit rlimit;
Argv = argv;
if (envp == 0 || *envp == 0)
envp = argv;
while (*envp)
envp++;
LastArg = envp[-1] + strlen(envp[-1]);
argc--, argv++;
while (argc > 0 && *argv[0] == '-') {
for (cp = &argv[0][1]; *cp; cp++) switch (*cp) {
case 'd':
debug = 1;
options |= SO_DEBUG;
break;
default:
fprintf(stderr,
"inetd: Unknown flag -%c ignored.\n", *cp);
break;
}
argc--, argv++;
}
if (argc > 0)
CONFIG = argv[0];
if (getrlimit(RLIMIT_NOFILE, &rlimit) == 0)
{
rlimit.rlim_cur = rlimit.rlim_max;
setrlimit(RLIMIT_NOFILE, &rlimit);
}
ndescriptors = getdtablesize();
maxservers = ndescriptors - OTHERDESCRIPTORS;
#ifndef DEBUG
if (fork())
exit(0);
{ int s;
for (s = 0; s < ndescriptors; s++)
(void) close(s);
}
(void) open("/", O_RDONLY);
(void) dup2(0, 1);
(void) dup2(0, 2);
{ int tt = open("/dev/tty", O_RDWR);
if (tt > 0) {
ioctl(tt, TIOCNOTTY, (char *)0);
(void) close(tt);
}
}
#else
{ int s;
for (s = 3; s < ndescriptors; s++)
(void) close(s);
}
#endif
openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
bzero((char *)&sv, sizeof(sv));
sv.sv_mask = SIGBLOCK;
sv.sv_handler = retry;
sigvec(SIGALRM, &sv, (struct sigvec *)0);
config();
sv.sv_handler = config;
sigvec(SIGHUP, &sv, (struct sigvec *)0);
sv.sv_handler = reapchild;
sigvec(SIGCHLD, &sv, (struct sigvec *)0);
for (;;) {
int ctrl, n;
fd_set readable;
struct sockaddr_in his_addr;
int hisaddrlen = sizeof (his_addr);
while (nsock == 0)
sigpause(0);
readable = allsock;
if ((n = select(maxsock + 1, &readable, (fd_set *)0,
(fd_set *)0, (struct timeval *)0)) <= 0) {
if (n < 0 && errno != EINTR)
syslog(LOG_WARNING, "select: %m\n");
sleep(1);
continue;
}
for (sep = servtab; n && sep; sep = sep->se_next)
if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
n--;
if (debug)
fprintf(stderr, "someone wants %s\n", sep->se_service);
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
ctrl = accept(sep->se_fd, &his_addr, &hisaddrlen);
if (debug)
fprintf(stderr, "accept, ctrl %d\n", ctrl);
if (ctrl < 0) {
if (errno == EINTR)
continue;
syslog(LOG_WARNING, "accept: %m");
continue;
}
} else
ctrl = sep->se_fd;
(void) sigblock(SIGBLOCK);
pid = 0;
dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork);
if (dofork) {
if (sep->se_count++ == 0)
(void)gettimeofday(&sep->se_time,
(struct timezone *)0);
else if (sep->se_count >= TOOMANY) {
struct timeval now;
(void)gettimeofday(&now, (struct timezone *)0);
if (now.tv_sec - sep->se_time.tv_sec >
CNT_INTVL) {
sep->se_time = now;
sep->se_count = 1;
} else {
syslog(LOG_ERR,
"%s/%s server failing (looping), service terminated",
sep->se_service, sep->se_proto);
termserv(sep);
sep->se_count = 0;
sigsetmask(0);
if (!timingout) {
timingout = 1;
alarm(RETRYTIME);
}
continue;
}
}
pid = fork();
}
if (pid < 0) {
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
(void) close(ctrl);
sigsetmask(0);
sleep(1);
continue;
}
if (pid && sep->se_wait) {
sep->se_wait = pid;
FD_CLR(sep->se_fd, &allsock);
nsock--;
}
sigsetmask(0);
if (pid == 0) {
char addrbuf[32];
#ifdef DEBUG
int tt;
if (dofork && (tt = open("/dev/tty", O_RDWR)) > 0) {
ioctl(tt, TIOCNOTTY, 0);
(void) close(tt);
}
#endif
sprintf(addrbuf, "%x.%d", ntohl(his_addr.sin_addr.s_addr),
ntohs(his_addr.sin_port));
if (dofork)
for (i = ndescriptors; --i > 2; )
if (i != ctrl)
(void) close(i);
if (sep->se_bi)
(*sep->se_bi->bi_fn)(ctrl, sep);
else {
setsid();
(void) dup2(ctrl, 0);
(void) close(ctrl);
(void) dup2(0, 1);
(void) dup2(0, 2);
if ((pwd = getpwnam(sep->se_user)) == NULL) {
syslog(LOG_ERR,
"getpwnam: %s: No such user",
sep->se_user);
if (sep->se_socktype != SOCK_STREAM)
recv(0, buf, sizeof (buf), 0);
_exit(1);
}
if (pwd->pw_uid) {
if (setgid((gid_t)pwd->pw_gid) == -1) {
syslog(LOG_ERR,
"setgid(%d): %m",
pwd->pw_gid);
if (sep->se_socktype !=
SOCK_STREAM)
recv(0, buf,
sizeof (buf), 0);
_exit(1);
}
initgroups(pwd->pw_name, pwd->pw_gid);
if (setuid((uid_t)pwd->pw_uid) == -1) {
syslog(LOG_ERR,
"setuid(%d): %m",
pwd->pw_uid);
if (sep->se_socktype !=
SOCK_STREAM)
recv(0, buf,
sizeof (buf), 0);
_exit(1);
}
}
if (debug)
fprintf(stderr, "%d execl %s\n",
getpid(), sep->se_server);
if (sep->se_argv[0] != NULL) {
if (!strcmp(sep->se_argv[0], "%A"))
execl(sep->se_server,
rindex(sep->se_server, '/')+1,
sep->se_socktype == SOCK_DGRAM
? (char *)0 : addrbuf, (char *)0);
else
execv(sep->se_server, sep->se_argv);
} else
execv(sep->se_server, sep->se_argv);
if (sep->se_socktype != SOCK_STREAM)
recv(0, buf, sizeof (buf), 0);
syslog(LOG_ERR, "execv %s: %m", sep->se_server);
_exit(1);
}
}
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
(void) close(ctrl);
}
}
}
void
reapchild()
{
union wait status;
int pid;
register struct servtab *sep;
extern char *sys_siglist[];
for (;;) {
pid = wait3(&status, WNOHANG, (struct rusage *)0);
if (pid <= 0)
break;
if (debug)
fprintf(stderr, "%d reaped\n", pid);
for (sep = servtab; sep; sep = sep->se_next)
if (sep->se_wait == pid) {
if (status.w_status) {
if (status.w_termsig) {
if (status.w_termsig > NSIG)
syslog(LOG_WARNING,
"%s: Signal %d%s",
sep->se_server,
status.w_termsig,
(status.w_coredump?
" - core dumped" :
""));
else
syslog(LOG_WARNING,
"%s: %s%s",
sep->se_server,
sys_siglist[status.w_termsig],
(status.w_coredump?
" - core dumped" :
""));
} else {
syslog(LOG_WARNING,
"%s: exit status %d",
sep->se_server,
status.w_retcode);
}
}
if (debug)
fprintf(stderr, "restored %s, fd %d\n",
sep->se_service, sep->se_fd);
FD_SET(sep->se_fd, &allsock);
nsock++;
sep->se_wait = 1;
}
}
}
void
config()
{
register struct servtab *sep, *cp, **sepp;
struct servtab *getconfigent(), *enter();
int omask;
if (!setconfig()) {
syslog(LOG_ERR, "%s: %m", CONFIG);
return;
}
for (sep = servtab; sep; sep = sep->se_next)
sep->se_checked = 0;
while (cp = getconfigent()) {
for (sep = servtab; sep; sep = sep->se_next) {
if (sep->se_isrpc) {
if (cp->se_isrpc
&& sep->se_rpc.prog == cp->se_rpc.prog
&& strcmp(sep->se_proto, cp->se_proto) == 0)
break;
} else {
if (!cp->se_isrpc
&& strcmp(sep->se_service, cp->se_service) == 0
&& strcmp(sep->se_proto, cp->se_proto) == 0)
break;
}
}
if (sep != 0) {
int i;
omask = sigblock(SIGBLOCK);
/*
* Don't touch se_wait if it's recording the
* pid for an outstanding daemon process.
*/
if (cp->se_bi == 0 && (sep->se_wait <= 1))
sep->se_wait = cp->se_wait;
#define SWAP(a, b) { char *c = a; a = b; b = c; }
if (cp->se_user)
SWAP(sep->se_user, cp->se_user);
if (cp->se_server)
SWAP(sep->se_server, cp->se_server);
for (i = 0; i < MAXARGV; i++)
SWAP(sep->se_argv[i], cp->se_argv[i]);
sigsetmask(omask);
freeconfig(cp);
if (debug)
print_service("REDO", sep);
} else {
sep = enter(cp);
if (debug)
print_service("ADD ", sep);
}
sep->se_checked = 1;
if (sep->se_isrpc) {
if (sep->se_fd != -1)
termserv(sep);
else
unregister(sep); /* just in case */
if (nservers >= maxservers) {
syslog(LOG_ERR, "%s/%s: too many services (max %d)",
sep->se_service, sep->se_proto,
maxservers);
sep->se_fd = -1;
continue;
}
setuprpc(sep);
} else {
sp = getservbyname(sep->se_service, sep->se_proto);
if (sp == NULL) {
syslog(LOG_ERR, "%s/%s: unknown service",
sep->se_service, sep->se_proto);
if (sep->se_fd != -1)
termserv(sep);
continue;
}
if (sp->s_port != sep->se_ctrladdr.sin_port) {
sep->se_ctrladdr.sin_port = sp->s_port;
if (sep->se_fd != -1)
termserv(sep);
}
if (sep->se_fd == -1) {
if (nservers >= maxservers) {
syslog(LOG_ERR, "%s/%s: too many services (max %d)",
sep->se_service, sep->se_proto,
maxservers);
sep->se_fd = -1;
continue;
}
setup(sep);
}
}
}
endconfig();
/*
* Purge anything not looked at above.
* XXX - if we add a service and delete one, the new service
* will be added to the count of services before the deleted one
* is subtracted. This means you may run out of services if this
* happens; however, we can't do much about that, since we get
* the socket for the new one before we close the one for the
* deleted service, and if we allowed that extra service we might
* run out of descriptors.
*/
omask = sigblock(SIGBLOCK);
sepp = &servtab;
while (sep = *sepp) {
if (sep->se_checked) {
sepp = &sep->se_next;
continue;
}
*sepp = sep->se_next;
if (sep->se_fd != -1)
termserv(sep);
if (debug)
print_service("FREE", sep);
freeconfig(sep);
free((char *)sep);
}
(void) sigsetmask(omask);
}
/*
* Try again to establish sockets on which to listen for requests
* for non-RPC-based services (if the attempt failed before, it was either
* because a socket could not be created, or more likely because the socket
* could not be bound to the service's address - probably because there was
* already a daemon out there with a socket bound to that address).
*/
void
retry()
{
register struct servtab *sep;
timingout = 0;
for (sep = servtab; sep; sep = sep->se_next) {
if (sep->se_fd == -1 && !sep->se_isrpc) {
if (nservers < maxservers)
setup(sep);
}
}
}
/*
* Set up to accept requests for a non-RPC-based service. Create a socket
* to listen for connections or datagrams, bind it to the address of that
* service, add its socket descriptor to the list of descriptors to poll,
* and increment the number of socket descriptors and active services.
*/
setup(sep)
register struct servtab *sep;
{
int on = 1;
if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) {
syslog(LOG_ERR, "%s/%s: socket: %m",
sep->se_service, sep->se_proto);
return;
}
#define turnon(fd, opt) \
setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
turnon(sep->se_fd, SO_DEBUG) < 0)
syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
#undef turnon
if (bind(sep->se_fd, &sep->se_ctrladdr,
sizeof (sep->se_ctrladdr)) < 0) {
syslog(LOG_ERR, "%s/%s: bind: %m",
sep->se_service, sep->se_proto);
(void) close(sep->se_fd);
sep->se_fd = -1;
if (!timingout) {
timingout = 1;
alarm(RETRYTIME);
}
return;
}
if (sep->se_socktype == SOCK_STREAM)
listen(sep->se_fd, 10);
FD_SET(sep->se_fd, &allsock);
nsock++;
if (sep->se_fd > maxsock)
maxsock = sep->se_fd;
nservers++;
}
/*
* Set up to accept requests for an RPC-based service. Create a socket
* to listen for connections or datagrams, bind it to a system-chosen
* address, register it with the portmapper under that address, add its
* socket descriptor to the list of descriptors to poll, and increment
* the number of socket descriptors and active services.
*/
setuprpc(sep)
register struct servtab *sep;
{
register int i;
struct sockaddr_in addr;
int len = sizeof(struct sockaddr_in);
if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) {
syslog(LOG_ERR, "%s/%s: socket: %m",
sep->se_service, sep->se_proto);
return;
}
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(sep->se_fd, &addr, sizeof(addr)) < 0) {
syslog(LOG_ERR, "%s/%s: bind: %m",
sep->se_service, sep->se_proto);
(void) close(sep->se_fd);
sep->se_fd = -1;
return;
}
if (getsockname(sep->se_fd, &addr, &len) != 0) {
syslog(LOG_ERR, "%s/%s: getsockname: %m",
sep->se_service, sep->se_proto);
(void) close(sep->se_fd);
sep->se_fd = -1;
return;
}
for (i = sep->se_rpc.lowvers; i <= sep->se_rpc.highvers; i++) {
pmap_set(sep->se_rpc.prog, i, (sep->se_socktype == SOCK_DGRAM) ?
IPPROTO_UDP : IPPROTO_TCP, ntohs(addr.sin_port));
}
if (sep->se_socktype == SOCK_STREAM)
listen(sep->se_fd, 10);
FD_SET(sep->se_fd, &allsock);
nsock++;
if (sep->se_fd > maxsock)
maxsock = sep->se_fd;
nservers++;
}
/*
* Shut down a service. Unregister it if it's an RPC service, remove
* its socket descriptor from the list of descriptors to poll, close
* that socket descriptor, set it to -1 (to indicate that it's shut down),
* and decrement the number of socket descriptors and active services.
*/
void
termserv(sep)
register struct servtab *sep;
{
if (sep->se_isrpc) {
/*
* Have to do this here because there might be multiple
* registers of the same prognum.
*/
unregister(sep);
}
FD_CLR(sep->se_fd, &allsock);
nsock--;
(void) close(sep->se_fd);
sep->se_fd = -1;
nservers--;
}
/*
* Unregister an RPC service.
*/
void
unregister(sep)
register struct servtab *sep;
{
register int i;
register struct servtab *s;
unsigned prog;
/*
* Unregister the service only if there were no rpc programnum
* earlier, because then you would pmap_unset that too!
* Added to support multiple transports for the same prognum.
*/
prog = sep->se_rpc.prog;
for (s = servtab; s; s = s->se_next) {
if (s == sep) /* Ignore this one */
continue;
if ((s->se_checked == 0) || !s->se_isrpc ||
(prog != s->se_rpc.prog))
continue;
/* Found an existing entry for that prog number */
return;
}
for (i = sep->se_rpc.lowvers; i <= sep->se_rpc.highvers; i++)
pmap_unset(sep->se_rpc.prog, i);
}
struct servtab *
enter(cp)
struct servtab *cp;
{
register struct servtab *sep;
int omask;
char *strdup();
sep = (struct servtab *)malloc(sizeof (*sep));
if (sep == (struct servtab *)0) {
syslog(LOG_ERR, "Out of memory.");
exit(-1);
}
*sep = *cp;
sep->se_fd = -1;
omask = sigblock(SIGBLOCK);
sep->se_next = servtab;
servtab = sep;
sigsetmask(omask);
return (sep);
}
FILE *fconfig = NULL;
struct servtab serv;
char line[256];
char *skip(), *nextline();
setconfig()
{
if (fconfig != NULL) {
fseek(fconfig, 0L, L_SET);
return (1);
}
fconfig = fopen(CONFIG, "r");
return (fconfig != NULL);
}
endconfig()
{
if (fconfig == NULL)
return;
fclose(fconfig);
fconfig = NULL;
}
#define LINEBUF 80
struct servtab *
getconfigent()
{
register struct servtab *sep = &serv;
char *cp, *arg, *tp, *strp;
int argc;
struct rpcent *rpc;
more:
bzero((char *) sep, sizeof(struct servtab));
/* skip over comment lines and blank lines */
while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0'))
;
if (cp == NULL)
return ((struct servtab *)0);
sep->se_service = strdup(skip(&cp));
arg = skip(&cp);
if (strcmp(arg, "stream") == 0)
sep->se_socktype = SOCK_STREAM;
else if (strcmp(arg, "dgram") == 0)
sep->se_socktype = SOCK_DGRAM;
else if (strcmp(arg, "rdm") == 0)
sep->se_socktype = SOCK_RDM;
else if (strcmp(arg, "seqpacket") == 0)
sep->se_socktype = SOCK_SEQPACKET;
else if (strcmp(arg, "raw") == 0)
sep->se_socktype = SOCK_RAW;
else
sep->se_socktype = -1;
sep->se_proto = strdup(skip(&cp));
if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
sep->se_isrpc = 1;
sep->se_rpc.lowvers = 0;
sep->se_rpc.highvers = 0;
tp = sep->se_service;
while (*tp != '/') {
if (*tp == '\0') {
sep->se_rpc.lowvers = 1;
sep->se_rpc.highvers = 1;
break;
} else
tp++;
}
*tp = '\0';
if ((rpc = getrpcbyname(sep->se_service)) != NULL)
sep->se_rpc.prog = rpc->r_number;
else {
strp = sep->se_service;
sep->se_rpc.prog = strtol(strp, &strp, 10);
if (strp != tp) {
/*
* Service name isn't all-numeric, so
* since we didn't find it it must not
* be known.
*/
syslog(LOG_ERR, "%s/%s: unknown service",
sep->se_service, sep->se_proto);
freeconfig(sep);
goto more;
}
}
if (sep->se_rpc.lowvers == 0) {
/*
* The service name ended with a slash, so the
* version number(s) are explicitly specified.
*/
tp++;
strp = tp;
sep->se_rpc.lowvers = strtol(tp, &strp, 10);
tp = strp;
if (*tp == '-') {
tp++;
strp = tp;
sep->se_rpc.highvers = strtol(tp, &strp, 10);
if (*strp != '\0') {
syslog(LOG_ERR, "%s/%s: bad high version number",
sep->se_service, sep->se_proto);
freeconfig(sep);
goto more;
}
} else if (*tp == '\0')
sep->se_rpc.highvers = sep->se_rpc.lowvers;
else {
syslog(LOG_ERR, "%s/%s: bad version number",
sep->se_service, sep->se_proto);
freeconfig(sep);
goto more;
}
}
} else
sep->se_isrpc = 0;
arg = skip(&cp);
sep->se_wait = strcmp(arg, "wait") == 0;
sep->se_user = strdup(skip(&cp));
sep->se_server = strdup(skip(&cp));
if (strcmp(sep->se_server, "internal") == 0) {
register struct biltin *bi;
for (bi = biltins; bi->bi_service; bi++)
if (bi->bi_socktype == sep->se_socktype &&
strcmp(bi->bi_service, sep->se_service) == 0)
break;
if (bi->bi_service == 0) {
syslog(LOG_ERR, "internal service %s/%s unknown",
sep->se_service, sep->se_proto);
freeconfig(sep);
goto more;
}
sep->se_bi = bi;
sep->se_wait = bi->bi_wait;
} else
sep->se_bi = NULL;
argc = 0;
for (arg = skip(&cp); cp; arg = skip(&cp))
if (argc < MAXARGV)
sep->se_argv[argc++] = strdup(arg);
while (argc <= MAXARGV)
sep->se_argv[argc++] = NULL;
return (sep);
}
freeconfig(cp)
register struct servtab *cp;
{
int i;
if (cp->se_service)
free(cp->se_service);
if (cp->se_proto)
free(cp->se_proto);
if (cp->se_user)
free(cp->se_user);
if (cp->se_server)
free(cp->se_server);
for (i = 0; i < MAXARGV; i++)
if (cp->se_argv[i])
free(cp->se_argv[i]);
}
char *
skip(cpp)
char **cpp;
{
register char *cp = *cpp;
char *start;
static char nullstring[1] = "";
if (cp == (char *) 0)
return(nullstring);
again:
while (*cp == ' ' || *cp == '\t')
cp++;
if (*cp == '\0') {
int i;
if ((i = getc(fconfig)) != EOF) {
char c = (char) i;
ungetc(c, fconfig);
/*
* A config line can be continued on subsequent
* indented lines.
*/
if (c == ' ' || c == '\t')
if (cp = nextline(fconfig))
goto again;
}
/*
* Signal end of line or file. We can't just return the
* null pointer, though. If the end occured in the middle
* of parsing a config line we have to continue returning valid
* string pointers for the benefit of code that might
* do strdup()'s or strcmp()'s against them.
*/
*cpp = 0;
return(nullstring);
}
start = cp;
while (*cp && *cp != ' ' && *cp != '\t')
cp++;
if (*cp != '\0')
*cp++ = '\0';
*cpp = cp;
return (start);
}
char *
nextline(fd)
FILE *fd;
{
char *cp;
if (fgets(line, sizeof (line), fd) == NULL)
return ((char *)0);
cp = index(line, '\n');
if (cp)
*cp = '\0';
return (line);
}
char *
strdup(cp)
char *cp;
{
char *new;
if (cp == NULL)
cp = "";
new = malloc((unsigned)(strlen(cp) + 1));
if (new == (char *)0) {
syslog(LOG_ERR, "Out of memory.");
exit(-1);
}
strcpy(new, cp);
return (new);
}
setproctitle(a, s)
char *a;
int s;
{
int size;
register char *cp;
struct sockaddr_in sin;
char buf[80];
cp = Argv[0];
size = sizeof(sin);
if (getpeername(s, &sin, &size) == 0)
sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr));
else
sprintf(buf, "-%s", a);
strncpy(cp, buf, LastArg - cp);
cp += strlen(cp);
while (cp < LastArg)
*cp++ = ' ';
}
/*
* Internet services provided internally by inetd:
*/
/* ARGSUSED */
echo_stream(s, sep) /* Echo service -- echo data back */
int s;
struct servtab *sep;
{
char buffer[BUFSIZ];
int i;
setproctitle("echo", s);
while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
write(s, buffer, i) > 0)
;
exit(0);
}
/* ARGSUSED */
echo_dg(s, sep) /* Echo service -- echo data back */
int s;
struct servtab *sep;
{
char buffer[BUFSIZ];
int i, size;
struct sockaddr sa;
size = sizeof(sa);
if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0)
return;
(void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
}
/* ARGSUSED */
discard_stream(s, sep) /* Discard service -- ignore data */
int s;
struct servtab *sep;
{
char buffer[BUFSIZ];
setproctitle("discard", s);
while (1) {
while (read(s, buffer, sizeof(buffer)) > 0)
;
if (errno != EINTR)
break;
}
exit(0);
}
/* ARGSUSED */
discard_dg(s, sep) /* Discard service -- ignore data */
int s;
struct servtab *sep;
{
char buffer[BUFSIZ];
(void) read(s, buffer, sizeof(buffer));
}
#include <ctype.h>
#define LINESIZ 72
char ring[128];
char *endring;
initring()
{
register int i;
endring = ring;
for (i = 0; i <= 128; ++i)
if (isprint(i))
*endring++ = i;
}
/* ARGSUSED */
chargen_stream(s, sep) /* Character generator */
int s;
struct servtab *sep;
{
char text[LINESIZ+2];
register int i;
register char *rp, *rs, *dp;
setproctitle("discard", s);
if (endring == 0)
initring();
for (rs = ring; ; ++rs) {
if (rs >= endring)
rs = ring;
rp = rs;
dp = text;
i = MIN(LINESIZ, endring - rp);
bcopy(rp, dp, i);
dp += i;
if ((rp += i) >= endring)
rp = ring;
if (i < LINESIZ) {
i = LINESIZ - i;
bcopy(rp, dp, i);
dp += i;
if ((rp += i) >= endring)
rp = ring;
}
*dp++ = '\r';
*dp++ = '\n';
if (write(s, text, dp - text) != dp - text)
break;
}
exit(0);
}
/* ARGSUSED */
chargen_dg(s, sep) /* Character generator */
int s;
struct servtab *sep;
{
char text[LINESIZ+2];
register int i;
register char *rp;
static char *rs = ring;
struct sockaddr sa;
int size;
if (endring == 0)
initring();
size = sizeof(sa);
if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
return;
rp = rs;
if (rs++ >= endring)
rs = ring;
i = MIN(LINESIZ - 2, endring - rp);
bcopy(rp, text, i);
if ((rp += i) >= endring)
rp = ring;
if (i < LINESIZ - 2) {
bcopy(rp, text, i);
if ((rp += i) >= endring)
rp = ring;
}
text[LINESIZ - 2] = '\r';
text[LINESIZ - 1] = '\n';
(void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
}
/*
* Return a machine readable date and time, in the form of the
* number of seconds since midnight, Jan 1, 1900. Since gettimeofday
* returns the number of seconds since midnight, Jan 1, 1970,
* we must add 2208988800 seconds to this figure to make up for
* some seventy years Bell Labs was asleep.
*/
long
machtime()
{
struct timeval tv;
if (gettimeofday(&tv, (struct timezone *)0) < 0) {
fprintf(stderr, "Unable to get time of day\n");
return (0L);
}
return (htonl((long)tv.tv_sec + 2208988800));
}
/* ARGSUSED */
machtime_stream(s, sep)
int s;
struct servtab *sep;
{
long result;
result = machtime();
(void) write(s, (char *) &result, sizeof(result));
}
/* ARGSUSED */
machtime_dg(s, sep)
int s;
struct servtab *sep;
{
long result;
struct sockaddr sa;
int size;
size = sizeof(sa);
if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0)
return;
result = machtime();
(void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
}
/* ARGSUSED */
daytime_stream(s, sep) /* Return human-readable time of day */
int s;
struct servtab *sep;
{
char buffer[256];
time_t time(), clock;
char *ctime();
clock = time((time_t *) 0);
sprintf(buffer, "%s\r", ctime(&clock));
(void) write(s, buffer, strlen(buffer));
}
/* ARGSUSED */
daytime_dg(s, sep) /* Return human-readable time of day */
int s;
struct servtab *sep;
{
char buffer[256];
time_t time(), clock;
struct sockaddr sa;
int size;
char *ctime();
clock = time((time_t *) 0);
size = sizeof(sa);
if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
return;
sprintf(buffer, "%s\r", ctime(&clock));
(void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
}
/*
* print_service:
* Dump relevant information to stderr
*/
print_service(action, sep)
char *action;
struct servtab *sep;
{
fprintf(stderr,
"%s: %s proto=%s, wait=%d, user=%s builtin=%x server=%s\n",
action, sep->se_service, sep->se_proto,
sep->se_wait, sep->se_user, sep->se_bi, sep->se_server);
}
#define NO_SETSID
#ifdef NO_SETSID
#include <sys/syscall.h>
/*
* BSD setpgrp(0,0) turns into a setsid() anyway and this will
* also behave nicely in 4.0 kernels.
*/
setsid()
{
return syscall(SYS_setpgrp, 0, 0);
}
#endif
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