/*
* Fake identd server.
*
- * Copyright (C) 2007 Denis Vlasenko
+ * Copyright (C) 2007 Denys Vlasenko
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+//usage:#define fakeidentd_trivial_usage
+//usage: "[-fiw] [-b ADDR] [STRING]"
+//usage:#define fakeidentd_full_usage "\n\n"
+//usage: "Provide fake ident (auth) service\n"
+//usage: "\n -f Run in foreground"
+//usage: "\n -i Inetd mode"
+//usage: "\n -w Inetd 'wait' mode"
+//usage: "\n -b ADDR Bind to specified address"
+//usage: "\n STRING Ident answer string (default: nobody)"
+
+#include "libbb.h"
#include <syslog.h>
-#include "busybox.h"
#include "isrv.h"
enum { TIMEOUT = 20 };
-/* Why use alarm(TIMEOUT-1)?
- * isrv's internal select() will run with timeout=TIMEOUT.
- * If nothing happens during TIMEOUT-1 seconds (no accept/read),
- * then ALL sessions timed out by now. Instead of closing them one-by-one
- * (isrv calls do_timeout for each 'stale' session),
- * SIGALRM triggered by alarm(TIMEOUT-1) will kill us, terminating them all.
- */
-
typedef struct identd_buf_t {
int pos;
int fd_flag;
char buf[64 - 2*sizeof(int)];
} identd_buf_t;
-static const char *bogouser = "nobody";
+#define bogouser bb_common_bufsiz1
static int new_peer(isrv_state_t *state, int fd)
{
int peer;
identd_buf_t *buf = xzalloc(sizeof(*buf));
- alarm(TIMEOUT - 1);
-
peer = isrv_register_peer(state, buf);
if (peer < 0)
return 0; /* failure */
if (isrv_register_fd(state, peer, fd) < 0)
return peer; /* failure, unregister peer */
- buf->fd_flag = fcntl(fd, F_GETFL, 0) | O_NONBLOCK;
+ buf->fd_flag = fcntl(fd, F_GETFL) | O_NONBLOCK;
isrv_want_rd(state, fd);
return 0;
}
{
identd_buf_t *buf = *paramp;
char *cur, *p;
+ int retval = 0; /* session is ok (so far) */
int sz;
- alarm(TIMEOUT - 1);
-
cur = buf->buf + buf->pos;
- fcntl(fd, F_SETFL, buf->fd_flag | O_NONBLOCK);
+ if (buf->fd_flag & O_NONBLOCK)
+ fcntl(fd, F_SETFL, buf->fd_flag);
sz = safe_read(fd, cur, sizeof(buf->buf) - buf->pos);
if (sz < 0) {
p = strpbrk(cur, "\r\n");
if (p)
*p = '\0';
- if (p || !sz || buf->pos == sizeof(buf->buf)) {
- /* fd is still in nonblocking mode - we never block here */
- fdprintf(fd, "%s : USERID : UNIX : %s\r\n", buf->buf, bogouser);
- goto term;
- }
- ok:
- fcntl(fd, F_SETFL, buf->fd_flag & ~O_NONBLOCK);
- return 0;
+ if (!p && sz && buf->pos <= (int)sizeof(buf->buf))
+ goto ok;
+ /* Terminate session. If we are in server mode, then
+ * fd is still in nonblocking mode - we never block here */
+ if (fd == 0) fd++; /* inetd mode? then write to fd 1 */
+ fdprintf(fd, "%s : USERID : UNIX : %s\r\n", buf->buf, bogouser);
term:
- fcntl(fd, F_SETFL, buf->fd_flag & ~O_NONBLOCK);
free(buf);
- return 1;
+ retval = 1; /* terminate */
+ ok:
+ if (buf->fd_flag & O_NONBLOCK)
+ fcntl(fd, F_SETFL, buf->fd_flag & ~O_NONBLOCK);
+ return retval;
}
-static int do_timeout(void **paramp)
+static int do_timeout(void **paramp UNUSED_PARAM)
{
return 1; /* terminate session */
}
static void inetd_mode(void)
{
identd_buf_t *buf = xzalloc(sizeof(*buf));
+ /* buf->pos = 0; - xzalloc did it */
/* We do NOT want nonblocking I/O here! */
- buf->fd_flag = fcntl(0, F_GETFL, 0);
- while (do_rd(0, (void*)&buf) == 0) /* repeat */;
+ /* buf->fd_flag = 0; - xzalloc did it */
+ do
+ alarm(TIMEOUT);
+ while (do_rd(0, (void*)&buf) == 0);
}
-int fakeidentd_main(int argc, char **argv)
+int fakeidentd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int fakeidentd_main(int argc UNUSED_PARAM, char **argv)
{
enum {
OPT_foreground = 0x1,
OPT_inetd = 0x2,
OPT_inetdwait = 0x4,
- OPT_nodeamon = 0x7,
+ OPT_fiw = 0x7,
OPT_bindaddr = 0x8,
};
unsigned opt;
int fd;
- opt = getopt32(argc, argv, "fiwb:", &bind_address);
- if (optind < argc)
- bogouser = argv[optind];
-
- /* Daemonize if no -f or -i or -w */
- bb_sanitize_stdio(!(opt & OPT_nodeamon));
- if (!(opt & OPT_nodeamon)) {
- openlog(applet_name, 0, LOG_DAEMON);
+ opt = getopt32(argv, "fiwb:", &bind_address);
+ strcpy(bogouser, "nobody");
+ if (argv[optind])
+ strncpy(bogouser, argv[optind], sizeof(bogouser));
+
+ /* Daemonize if no -f and no -i and no -w */
+ if (!(opt & OPT_fiw))
+ bb_daemonize_or_rexec(0, argv);
+
+ /* Where to log in inetd modes? "Classic" inetd
+ * probably has its stderr /dev/null'ed (we need log to syslog?),
+ * but daemontools-like utilities usually expect that children
+ * log to stderr. I like daemontools more. Go their way.
+ * (Or maybe we need yet another option "log to syslog") */
+ if (!(opt & OPT_fiw) /* || (opt & OPT_syslog) */) {
+ openlog(applet_name, LOG_PID, LOG_DAEMON);
logmode = LOGMODE_SYSLOG;
}
/* Ignore closed connections when writing */
signal(SIGPIPE, SIG_IGN);
- if (opt & OPT_inetdwait) {
- fd = 0;
- } else {
+ fd = 0;
+ if (!(opt & OPT_inetdwait)) {
fd = create_and_bind_stream_or_die(bind_address,
bb_lookup_port("identd", "tcp", 113));
xlisten(fd, 5);
}
- isrv_run(fd, new_peer, do_rd, NULL, do_timeout, TIMEOUT, 1);
+ isrv_run(fd, new_peer, do_rd, /*do_wr:*/ NULL, do_timeout,
+ TIMEOUT, (opt & OPT_inetdwait) ? TIMEOUT : 0);
return 0;
}
projects / oweals / busybox.git / blobdiff