* service name must be in /etc/services
* socket type stream/dgram/raw/rdm/seqpacket
* protocol must be in /etc/protocols
+ * (usually "tcp" or "udp")
* wait/nowait[.max] single-threaded/multi-threaded, max #
* user[.group] or user[:group] user/group to run daemon as
* server program full path name
* For RPC services
* service name/version must be in /etc/rpc
* socket type stream/dgram/raw/rdm/seqpacket
- * protocol must be in /etc/protocols
+ * rpc/protocol "rpc/tcp" etc
* wait/nowait[.max] single-threaded/multi-threaded
* user[.group] or user[:group] user to run daemon as
* server program full path name
* It should fork, and the parent should then exit to allow inetd to check
* for new service requests to spawn new servers. Datagram servers which
* process all incoming datagrams on a socket and eventually time out are
- * said to be "single-threaded". The comsat(8), (biff(1)) and talkd(8)
+ * said to be "single-threaded". The comsat(8), biff(1) and talkd(8)
* utilities are both examples of the latter type of datagram server. The
* tftpd(8) utility is an example of a multi-threaded datagram server.
*
* connection requests until a timeout.
*/
-/* Here's the scoop concerning the user[.:]group feature:
- *
- * 1) set-group-option off.
- *
+/* Here's the scoop concerning the user[:group] feature:
+ * 1) group is not specified:
* a) user = root: NO setuid() or setgid() is done
- *
* b) other: setgid(primary group as found in passwd)
* initgroups(name, primary group)
* setuid()
- *
- * 2) set-group-option on.
- *
+ * 2) group is specified:
* a) user = root: setgid(specified group)
* NO initgroups()
* NO setuid()
- *
* b) other: setgid(specified group)
* initgroups(name, specified group)
* setuid()
*/
-#include "libbb.h"
#include <syslog.h>
#include <sys/un.h>
+#include "libbb.h"
-//#define ENABLE_FEATURE_INETD_RPC 1
-//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO 1
-//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD 1
-//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME 1
-//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME 1
-//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 1
-//#define ENABLE_FEATURE_IPV6 1
+#if !BB_MMU
+/* stream versions of these builtins are forking,
+ * can't do that (easily) on NOMMU */
+#undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
+#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD 0
+#undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
+#endif
#if ENABLE_FEATURE_INETD_RPC
#include <rpc/rpc.h>
#define _PATH_INETDPID "/var/run/inetd.pid"
-#define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
+#define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
#define RETRYTIME (60*10) /* retry after bind or server fail */
#ifndef RLIMIT_NOFILE
/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
#define FD_MARGIN 8
-/* Check unsupporting builtin */
-#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
-# define INETD_FEATURE_ENABLED
-#endif
-
-#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
-# define INETD_SETPROCTITLE
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
+# define INETD_BUILTINS_ENABLED
#endif
typedef struct servtab_t {
/* The most frequently referenced one: */
int se_fd; /* open descriptor */
/* NB: 'biggest fields last' saves on code size (~250 bytes) */
- char *se_hostaddr; /* host address to listen on */
- char *se_service; /* name of service */
- char *se_proto; /* protocol used */
+ /* [addr:]service socktype proto wait user[:group] prog [args] */
+ char *se_local_hostname; /* addr to listen on */
+ char *se_service; /* "80" or "www" or "mount/2[-3]" */
+ /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
+ char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
#if ENABLE_FEATURE_INETD_RPC
int se_rpcprog; /* rpc program number */
- int se_rpcversl; /* rpc program lowest version */
- int se_rpcversh; /* rpc program highest version */
-#define isrpcservice(sep) ((sep)->se_rpcversl != 0)
+ int se_rpcver_lo; /* rpc program lowest version */
+ int se_rpcver_hi; /* rpc program highest version */
+#define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
#else
-#define isrpcservice(sep) 0
+#define is_rpc_service(sep) 0
#endif
- pid_t se_wait; /* single threaded server */
- socktype_t se_socktype; /* type of socket to use */
- family_t se_family; /* address family */
+ pid_t se_wait; /* 0:"nowait", 1:"wait" */
+ socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
+ family_t se_family; /* AF_UNIX/INET[6] */
+ smallint se_proto_no; /* almost "getprotobyname(se_proto)" */
smallint se_checked; /* looked at during merge */
char *se_user; /* user name to run as */
- char *se_group; /* group name to run as */
-#ifdef INETD_FEATURE_ENABLED
- const struct builtin *se_bi; /* if built-in, description */
+ char *se_group; /* group name to run as, can be NULL */
+#ifdef INETD_BUILTINS_ENABLED
+ const struct builtin *se_builtin; /* if built-in, description */
#endif
- int se_ctrladdr_size;
- int se_max; /* max # of instances of this service */
- int se_count; /* number started since se_time */
+// TODO: wrong algorithm!!!
+ unsigned se_max; /* max # of instances of this service */
+ unsigned se_count; /* number started since se_time */
+ unsigned se_time; /* start of se_count */
struct servtab_t *se_next;
- struct timeval se_time; /* start of se_count */
- char *se_server; /* server program */
+ len_and_sockaddr *se_lsa;
+ char *se_program; /* server program */
#define MAXARGV 20
char *se_argv[MAXARGV + 1]; /* program arguments */
- union {
- struct sockaddr se_un_ctrladdr;
- struct sockaddr_in se_un_ctrladdr_in;
-#if ENABLE_FEATURE_IPV6
- struct sockaddr_in6 se_un_ctrladdr_in6;
-#endif
- struct sockaddr_un se_un_ctrladdr_un;
- } se_un; /* bound address */
-#define se_ctrladdr se_un.se_un_ctrladdr
-#define se_ctrladdr_in se_un.se_un_ctrladdr_in
-#define se_ctrladdr_in6 se_un.se_un_ctrladdr_in6
-#define se_ctrladdr_un se_un.se_un_ctrladdr_un
} servtab_t;
-#ifdef INETD_FEATURE_ENABLED
-struct builtin {
- const char *bi_service; /* internally provided service name */
- socktype_t bi_socktype; /* type of socket supported */
- uint8_t bi_fork; /* 1 if should fork before call */
-// Commented since it is always 0
-// uint8_t bi_wait; /* 1 if should wait for child */
- void (*bi_fn) (int, servtab_t *);
-};
-
+#ifdef INETD_BUILTINS_ENABLED
/* Echo received data */
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
static void echo_stream(int, servtab_t *);
static void chargen_dg(int, servtab_t *);
#endif
+struct builtin {
+ const char *bi_service; /* internally provided service name */
+ uint8_t bi_fork; /* 1 if stream fn should run in child */
+ /* All builtins are "nowait" */
+ /* uint8_t bi_wait; */ /* 1 if should wait for child */
+ void (*bi_stream_fn)(int, servtab_t *);
+ void (*bi_dgram_fn)(int, servtab_t *);
+};
+
static const struct builtin builtins[] = {
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
/* Echo received data */
- {"echo", SOCK_STREAM, 1, echo_stream,},
- {"echo", SOCK_DGRAM, 0, echo_dg,},
+ { "echo", 1, echo_stream, echo_dg },
#endif
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
/* Internet /dev/null */
- {"discard", SOCK_STREAM, 1, discard_stream,},
- {"discard", SOCK_DGRAM, 0, discard_dg,},
+ { "discard", 1, discard_stream, discard_dg },
+#endif
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+ /* Familiar character generator */
+ { "chargen", 1, chargen_stream, chargen_dg },
#endif
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
/* Return 32 bit time since 1900 */
- {"time", SOCK_STREAM, 0, machtime_stream,},
- {"time", SOCK_DGRAM, 0, machtime_dg,},
+ { "time", 0, machtime_stream, machtime_dg },
#endif
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
/* Return human-readable time */
- {"daytime", SOCK_STREAM, 0, daytime_stream,},
- {"daytime", SOCK_DGRAM, 0, daytime_dg,},
-#endif
-#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
- /* Familiar character generator */
- {"chargen", SOCK_STREAM, 1, chargen_stream,},
- {"chargen", SOCK_DGRAM, 0, chargen_dg,},
+ { "daytime", 0, daytime_stream, daytime_dg },
#endif
- { /* zero filled */ }
};
-#endif /* INETD_FEATURE_ENABLED */
+#endif /* INETD_BUILTINS_ENABLED */
struct globals {
rlim_t rlim_ofile_cur;
struct rlimit rlim_ofile;
- servtab_t *servtab;
+ servtab_t *serv_list;
int global_queuelen;
- int nsock;
+ int prev_maxsock;
int maxsock;
- int toomany;
- int timingout;
- struct servent *sp;
- uid_t uid;
+ unsigned max_concurrency;
+ smallint alarm_armed;
+ uid_t real_uid; /* user ID who ran us */
+ unsigned config_lineno;
const char *config_filename;
FILE *fconfig;
- char *defhost;
-#ifdef INETD_SETPROCTITLE
- char **Argv;
- char *LastArg;
-#endif
+ char *default_local_hostname;
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
char *endring;
char *ringpos;
char ring[128];
#endif
fd_set allsock;
- /* Used only in nextline() */
- char line[80]; /* at least 80, see LINE_SIZE */
+ /* Used in next_line(), and as scratch read buffer */
+ char line[256]; /* _at least_ 256, see LINE_SIZE */
};
#define G (*(struct globals*)&bb_common_bufsiz1)
enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
};
#define rlim_ofile_cur (G.rlim_ofile_cur )
#define rlim_ofile (G.rlim_ofile )
-#define servtab (G.servtab )
+#define serv_list (G.serv_list )
#define global_queuelen (G.global_queuelen)
-#define nsock (G.nsock )
+#define prev_maxsock (G.prev_maxsock )
#define maxsock (G.maxsock )
-#define toomany (G.toomany )
-#define timingout (G.timingout )
-#define sp (G.sp )
-#define uid (G.uid )
+#define max_concurrency (G.max_concurrency)
+#define alarm_armed (G.alarm_armed )
+#define real_uid (G.real_uid )
+#define config_lineno (G.config_lineno )
#define config_filename (G.config_filename)
#define fconfig (G.fconfig )
-#define defhost (G.defhost )
-#define Argv (G.Argv )
-#define LastArg (G.LastArg )
+#define default_local_hostname (G.default_local_hostname)
+#define first_ps_byte (G.first_ps_byte )
+#define last_ps_byte (G.last_ps_byte )
#define endring (G.endring )
#define ringpos (G.ringpos )
#define ring (G.ring )
config_filename = "/etc/inetd.conf"; \
} while (0)
-/* xstrdup(NULL) returns NULL, but this one
- * will return newly-allocated "" if called with NULL arg
- * TODO: audit whether this makes any real difference
- */
-static char *xxstrdup(char *cp)
+static void maybe_close(int fd)
{
- return xstrdup(cp ? cp : "");
+ if (fd >= 0)
+ close(fd);
}
-static int setconfig(void)
+// TODO: move to libbb?
+static len_and_sockaddr *xzalloc_lsa(int family)
{
- free(defhost);
- defhost = xstrdup("*");
- if (fconfig != NULL) {
- fseek(fconfig, 0L, SEEK_SET);
- return 1;
- }
- fconfig = fopen(config_filename, "r");
- return (fconfig != NULL);
+ len_and_sockaddr *lsa;
+ int sz;
+
+ sz = sizeof(struct sockaddr_in);
+#if ENABLE_FEATURE_IPV6
+ if (family == AF_INET6)
+ sz = sizeof(struct sockaddr_in6);
+#endif
+ lsa = xzalloc(LSA_LEN_SIZE + sz);
+ lsa->len = sz;
+ lsa->u.sa.sa_family = family;
+ return lsa;
}
-static void endconfig(void)
+
+static void rearm_alarm(void)
{
- if (fconfig) {
- (void) fclose(fconfig);
- fconfig = NULL;
+ if (!alarm_armed) {
+ alarm_armed = 1;
+ alarm(RETRYTIME);
}
- free(defhost);
- defhost = 0;
+}
+
+static void block_CHLD_HUP_ALRM(sigset_t *m)
+{
+ sigemptyset(m);
+ sigaddset(m, SIGCHLD);
+ sigaddset(m, SIGHUP);
+ sigaddset(m, SIGALRM);
+ sigprocmask(SIG_BLOCK, m, NULL);
+}
+
+static void unblock_sigs(sigset_t *m)
+{
+ sigprocmask(SIG_UNBLOCK, m, NULL);
}
#if ENABLE_FEATURE_INETD_RPC
{
int n;
struct sockaddr_in ir_sin;
- struct protoent *pp;
socklen_t size;
- pp = getprotobyname(sep->se_proto + 4);
- if (pp == NULL) {
- bb_perror_msg("%s: getproto", sep->se_proto);
- return;
- }
- size = sizeof ir_sin;
+ size = sizeof(ir_sin);
if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
- bb_perror_msg("%s/%s: getsockname",
- sep->se_service, sep->se_proto);
+ bb_perror_msg("getsockname");
return;
}
- for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
- (void) pmap_unset(sep->se_rpcprog, n);
- if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port)))
- bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
- sep->se_service, sep->se_proto,
- sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port));
+ for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
+ pmap_unset(sep->se_rpcprog, n);
+ if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
+ bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
+ sep->se_service, sep->se_proto,
+ sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
}
}
{
int n;
- for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
+ for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
if (!pmap_unset(sep->se_rpcprog, n))
- bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
+ bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
}
}
#endif /* FEATURE_INETD_RPC */
-static void freeconfig(servtab_t *cp)
-{
- int i;
-
- free(cp->se_hostaddr);
- free(cp->se_service);
- free(cp->se_proto);
- free(cp->se_user);
- free(cp->se_group);
- free(cp->se_server);
- for (i = 0; i < MAXARGV; i++)
- free(cp->se_argv[i]);
-}
-
-static int bump_nofile(void)
+static void bump_nofile(void)
{
-#define FD_CHUNK 32
-
+ enum { FD_CHUNK = 32 };
struct rlimit rl;
- if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
- bb_perror_msg("getrlimit");
- return -1;
- }
+ /* Never fails under Linux (except if you pass it bad arguments) */
+ getrlimit(RLIMIT_NOFILE, &rl);
rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
if (rl.rlim_cur <= rlim_ofile_cur) {
- bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
+ bb_error_msg("can't extend file limit, max = %d",
(int) rl.rlim_cur);
- return -1;
+ return;
}
if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
bb_perror_msg("setrlimit");
- return -1;
+ return;
}
rlim_ofile_cur = rl.rlim_cur;
- return 0;
}
-static void setup(servtab_t *sep)
+static void remove_fd_from_set(int fd)
+{
+ if (fd >= 0) {
+ FD_CLR(fd, &allsock);
+ maxsock = -1;
+ }
+}
+
+static void add_fd_to_set(int fd)
+{
+ if (fd >= 0) {
+ FD_SET(fd, &allsock);
+ if (maxsock >= 0 && fd > maxsock) {
+ prev_maxsock = maxsock = fd;
+ if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
+ bump_nofile();
+ }
+ }
+}
+
+static void recalculate_maxsock(void)
+{
+ int fd = 0;
+ while (fd <= prev_maxsock) {
+ if (FD_ISSET(fd, &allsock))
+ maxsock = fd;
+ fd++;
+ }
+ prev_maxsock = maxsock;
+ if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
+ bump_nofile();
+}
+
+static void prepare_socket_fd(servtab_t *sep)
{
- int r;
+ int r, fd;
- sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
- if (sep->se_fd < 0) {
- bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
+ fd = socket(sep->se_family, sep->se_socktype, 0);
+ if (fd < 0) {
+ bb_perror_msg("socket");
return;
}
- setsockopt_reuseaddr(sep->se_fd);
+ setsockopt_reuseaddr(fd);
#if ENABLE_FEATURE_INETD_RPC
- if (isrpcservice(sep)) {
+ if (is_rpc_service(sep)) {
struct passwd *pwd;
- /*
- * for RPC services, attempt to use a reserved port
- * if they are going to be running as root.
- *
- * Also, zero out the port for all RPC services; let bind()
- * find one.
- */
- sep->se_ctrladdr_in.sin_port = 0;
- if (sep->se_user && (pwd = getpwnam(sep->se_user)) &&
- pwd->pw_uid == 0 && uid == 0)
- r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in);
- else {
- r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
- if (r == 0) {
- socklen_t len = sep->se_ctrladdr_size;
- int saveerrno = errno;
-
- /* update se_ctrladdr_in.sin_port */
- r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len);
- if (r <= 0)
- errno = saveerrno;
- }
+ /* zero out the port for all RPC services; let bind()
+ * find one. */
+ set_nport(sep->se_lsa, 0);
+
+ /* for RPC services, attempt to use a reserved port
+ * if they are going to be running as root. */
+ if (real_uid == 0 && sep->se_family == AF_INET
+ && (pwd = getpwnam(sep->se_user)) != NULL
+ && pwd->pw_uid == 0
+ ) {
+ r = bindresvport(fd, &sep->se_lsa->u.sin);
+ } else {
+ r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
+ }
+ if (r == 0) {
+ int saveerrno = errno;
+ /* update lsa with port# */
+ getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
+ errno = saveerrno;
}
} else
#endif
- r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
- if (r < 0) {
- bb_perror_msg("%s/%s (%d): bind",
- sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
- close(sep->se_fd);
- sep->se_fd = -1;
- if (!timingout) {
- timingout = 1;
- alarm(RETRYTIME);
+ {
+ if (sep->se_family == AF_UNIX) {
+ struct sockaddr_un *sun;
+ sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
+ unlink(sun->sun_path);
}
+ r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
+ }
+ if (r < 0) {
+ bb_perror_msg("%s/%s: bind",
+ sep->se_service, sep->se_proto);
+ close(fd);
+ rearm_alarm();
return;
}
if (sep->se_socktype == SOCK_STREAM)
- listen(sep->se_fd, global_queuelen);
-
- FD_SET(sep->se_fd, &allsock);
- nsock++;
- if (sep->se_fd > maxsock) {
- maxsock = sep->se_fd;
- if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
- bump_nofile();
+ listen(fd, global_queuelen);
+
+ add_fd_to_set(fd);
+ sep->se_fd = fd;
+}
+
+static int reopen_config_file(void)
+{
+ free(default_local_hostname);
+ default_local_hostname = xstrdup("*");
+ if (fconfig != NULL)
+ fclose(fconfig);
+ config_lineno = 0;
+ fconfig = fopen_or_warn(config_filename, "r");
+ return (fconfig != NULL);
+}
+
+static void close_config_file(void)
+{
+ if (fconfig) {
+ fclose(fconfig);
+ fconfig = NULL;
}
}
-static char *nextline(void)
+static char *next_line(void)
{
if (fgets(line, LINE_SIZE, fconfig) == NULL)
return NULL;
+ config_lineno++;
*strchrnul(line, '\n') = '\0';
return line;
}
-static char *skip(char **cpp) /* int report; */
+static char *next_word(char **cpp)
{
- char *cp = *cpp;
char *start;
+ char *cp = *cpp;
-/* erp: */
- if (cp == NULL) {
- /* if (report) */
- /* bb_error_msg("syntax error in inetd config file"); */
+ if (cp == NULL)
return NULL;
- }
-
again:
while (*cp == ' ' || *cp == '\t')
cp++;
int c = getc(fconfig);
ungetc(c, fconfig);
if (c == ' ' || c == '\t') {
- cp = nextline();
+ cp = next_line();
if (cp)
goto again;
}
return start;
}
+static void free_servtab_strings(servtab_t *cp)
+{
+ int i;
+
+ free(cp->se_local_hostname);
+ free(cp->se_service);
+ free(cp->se_proto);
+ free(cp->se_user);
+ free(cp->se_group);
+ free(cp->se_lsa); /* not a string in fact */
+ free(cp->se_program);
+ for (i = 0; i < MAXARGV; i++)
+ free(cp->se_argv[i]);
+}
+
static servtab_t *new_servtab(void)
{
- return xzalloc(sizeof(servtab_t));
+ servtab_t *newtab = xzalloc(sizeof(servtab_t));
+ newtab->se_fd = -1; /* paranoia */
+ return newtab;
}
-static servtab_t *dupconfig(servtab_t *sep)
+static servtab_t *dup_servtab(servtab_t *sep)
{
servtab_t *newtab;
int argc;
newtab = new_servtab();
- newtab->se_service = xstrdup(sep->se_service);
- newtab->se_socktype = sep->se_socktype;
- newtab->se_family = sep->se_family;
- newtab->se_proto = xstrdup(sep->se_proto);
-#if ENABLE_FEATURE_INETD_RPC
- newtab->se_rpcprog = sep->se_rpcprog;
- newtab->se_rpcversl = sep->se_rpcversl;
- newtab->se_rpcversh = sep->se_rpcversh;
-#endif
- newtab->se_wait = sep->se_wait;
- newtab->se_user = xstrdup(sep->se_user);
- newtab->se_group = xstrdup(sep->se_group);
-#ifdef INETD_FEATURE_ENABLED
- newtab->se_bi = sep->se_bi;
-#endif
- newtab->se_server = xstrdup(sep->se_server);
-
+ *newtab = *sep; /* struct copy */
+ /* deep-copying strings */
+ newtab->se_service = xstrdup(newtab->se_service);
+ newtab->se_proto = xstrdup(newtab->se_proto);
+ newtab->se_user = xstrdup(newtab->se_user);
+ newtab->se_group = xstrdup(newtab->se_group);
+ newtab->se_program = xstrdup(newtab->se_program);
for (argc = 0; argc <= MAXARGV; argc++)
- newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
- newtab->se_max = sep->se_max;
+ newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
+ /* NB: se_fd, se_hostaddr and se_next are always
+ * overwrittend by callers, so we don't bother resetting them
+ * to NULL/0/-1 etc */
return newtab;
}
-static servtab_t *getconfigent(void)
+/* gcc generates much more code if this is inlined */
+static NOINLINE servtab_t *parse_one_line(void)
{
- servtab_t *sep;
int argc;
- char *cp, *arg;
+ char *p, *cp, *arg;
char *hostdelim;
+ servtab_t *sep;
servtab_t *nsep;
- servtab_t *psep;
-
+ new:
sep = new_servtab();
-
more:
- while ((cp = nextline()) && *cp == '#')
+ while ((cp = next_line()) && *cp == '#')
continue; /* skip comment lines */
if (cp == NULL) {
free(sep);
return NULL;
}
- arg = skip(&cp);
+ arg = next_word(&cp);
if (arg == NULL) {
/* A blank line. */
goto more;
}
- /* Check for a host name. */
+ /* [host:]service socktype proto wait user[:group] prog [args] */
+ /* Check for "host:...." line */
hostdelim = strrchr(arg, ':');
if (hostdelim) {
*hostdelim = '\0';
- sep->se_hostaddr = xstrdup(arg);
+ sep->se_local_hostname = xstrdup(arg);
arg = hostdelim + 1;
- /*
- * If the line is of the form `host:', then just change the
- * default host for the following lines.
- */
if (*arg == '\0') {
- arg = skip(&cp);
- if (cp == NULL) {
- free(defhost);
- defhost = sep->se_hostaddr;
+ arg = next_word(&cp);
+ if (arg == NULL) {
+ /* Line has just "host:", change the
+ * default host for the following lines. */
+ free(default_local_hostname);
+ default_local_hostname = sep->se_local_hostname;
goto more;
}
}
} else
- sep->se_hostaddr = xxstrdup(defhost);
-
- sep->se_service = xxstrdup(arg);
- arg = skip(&cp);
+ sep->se_local_hostname = xstrdup(default_local_hostname);
+ /* service socktype proto wait user[:group] prog [args] */
+ sep->se_service = xstrdup(arg);
+ /* socktype proto wait user[:group] prog [args] */
+ arg = next_word(&cp);
+ if (arg == NULL) {
+ parse_err:
+ bb_error_msg("parse error on line %u, line is ignored",
+ config_lineno);
+ free_servtab_strings(sep);
+ /* Just "goto more" can make sep to carry over e.g.
+ * "rpc"-ness (by having se_rpcver_lo != 0).
+ * We will be more paranoid: */
+ free(sep);
+ goto new;
+ }
{
static int8_t SOCK_xxx[] ALIGN1 = {
-1,
, arg)];
}
- sep->se_proto = xxstrdup(skip(&cp));
-
- if (strcmp(sep->se_proto, "unix") == 0) {
+ /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
+ sep->se_proto = arg = xstrdup(next_word(&cp));
+ if (arg == NULL)
+ goto parse_err;
+ if (strcmp(arg, "unix") == 0) {
sep->se_family = AF_UNIX;
} else {
+ char *six;
sep->se_family = AF_INET;
- if (sep->se_proto[strlen(sep->se_proto) - 1] == '6')
+ six = last_char_is(arg, '6');
+ if (six) {
#if ENABLE_FEATURE_IPV6
+ *six = '\0';
sep->se_family = AF_INET6;
#else
- bb_error_msg("%s: IPV6 not supported", sep->se_proto);
+ bb_error_msg("%s: no support for IPv6", sep->se_proto);
+ goto parse_err;
#endif
- if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
+ }
+ if (strncmp(arg, "rpc/", 4) == 0) {
#if ENABLE_FEATURE_INETD_RPC
- char *p, *ccp;
- long l;
-
+ unsigned n;
+ arg += 4;
p = strchr(sep->se_service, '/');
- if (p == 0) {
- bb_error_msg("%s: no rpc version", sep->se_service);
- goto more;
+ if (p == NULL) {
+ bb_error_msg("no rpc version: '%s'", sep->se_service);
+ goto parse_err;
}
*p++ = '\0';
- l = strtol(p, &ccp, 0);
- if (ccp == p || l < 0 || l > INT_MAX) {
- badafterall:
- bb_error_msg("%s/%s: bad rpc version", sep->se_service, p);
- goto more;
+ n = bb_strtou(p, &p, 10);
+ if (n > INT_MAX) {
+ bad_ver_spec:
+ bb_error_msg("bad rpc version");
+ goto parse_err;
}
- sep->se_rpcversl = sep->se_rpcversh = l;
- if (*ccp == '-') {
- p = ccp + 1;
- l = strtol(p, &ccp, 0);
- if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
- goto badafterall;
- sep->se_rpcversh = l;
- } else if (*ccp != '\0')
- goto badafterall;
+ sep->se_rpcver_lo = sep->se_rpcver_hi = n;
+ if (*p == '-') {
+ p++;
+ n = bb_strtou(p, &p, 10);
+ if (n > INT_MAX || n < sep->se_rpcver_lo)
+ goto bad_ver_spec;
+ sep->se_rpcver_hi = n;
+ }
+ if (*p != '\0')
+ goto bad_ver_spec;
#else
- bb_error_msg("%s: rpc services not supported", sep->se_service);
+ bb_error_msg("no support for rpc services");
+ goto parse_err;
#endif
}
+ /* we don't really need getprotobyname()! */
+ if (strcmp(arg, "tcp") == 0)
+ sep->se_proto_no = 6;
+ if (strcmp(arg, "udp") == 0)
+ sep->se_proto_no = 17;
+ if (six)
+ *six = '6';
+ if (!sep->se_proto_no) /* not tcp/udp?? */
+ goto parse_err;
}
- arg = skip(&cp);
- if (arg == NULL)
- goto more;
- {
- char *s = strchr(arg, '.');
- if (s) {
- *s++ = '\0';
- sep->se_max = xatoi(s);
- } else
- sep->se_max = toomany;
+ /* [no]wait[.max] user[:group] prog [args] */
+ arg = next_word(&cp);
+ if (arg == NULL)
+ goto parse_err;
+ sep->se_max = max_concurrency;
+ p = strchr(arg, '.');
+ if (p) {
+ *p++ = '\0';
+ sep->se_max = bb_strtou(p, NULL, 10);
+ if (errno)
+ goto parse_err;
}
sep->se_wait = (strcmp(arg, "wait") == 0);
- sep->se_user = xxstrdup(skip(&cp));
+
+ /* user[:group] prog [args] */
+ sep->se_user = xstrdup(next_word(&cp));
+ if (sep->se_user == NULL)
+ goto parse_err;
arg = strchr(sep->se_user, '.');
if (arg == NULL)
arg = strchr(sep->se_user, ':');
sep->se_group = xstrdup(arg);
}
- sep->se_server = xxstrdup(skip(&cp));
-#ifdef INETD_FEATURE_ENABLED
- /* sep->se_bi = NULL; - done by new_servtab() */
- if (strcmp(sep->se_server, "internal") == 0) {
- const struct builtin *bi;
-
- for (bi = builtins; 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) {
- bb_error_msg("internal service %s unknown", sep->se_service);
- goto more;
- }
- sep->se_bi = bi;
- sep->se_wait = 0; /* = bi->bi_wait; - always 0 */
+ /* prog [args] */
+ sep->se_program = xstrdup(next_word(&cp));
+ if (sep->se_program == NULL)
+ goto parse_err;
+#ifdef INETD_BUILTINS_ENABLED
+ /* sep->se_builtin = NULL; - done by new_servtab() */
+ if (strcmp(sep->se_program, "internal") == 0
+ && (sep->se_socktype == SOCK_STREAM
+ || sep->se_socktype == SOCK_DGRAM)
+ ) {
+ int i;
+ for (i = 0; i < ARRAY_SIZE(builtins); i++)
+ if (strcmp(builtins[i].bi_service, sep->se_service) == 0)
+ goto found_bi;
+ bb_error_msg("unknown internal service %s", sep->se_service);
+ goto parse_err;
+ found_bi:
+ sep->se_builtin = &builtins[i];
+ sep->se_wait = 0; /* = builtins[i].bi_wait; - always 0 */
}
#endif
argc = 0;
- while ((arg = skip(&cp)) != NULL && argc < MAXARGV) {
- sep->se_argv[argc++] = xxstrdup(arg);
+ while ((arg = next_word(&cp)) != NULL && argc < MAXARGV) {
+ sep->se_argv[argc++] = xstrdup(arg);
}
/* while (argc <= MAXARGV) */
/* sep->se_argv[argc++] = NULL; - done by new_servtab() */
* specifier was a comma separated list of hostnames. If so
* we'll make new entries for each address.
*/
- while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) {
- nsep = dupconfig(sep);
-
+ while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
+ nsep = dup_servtab(sep);
/*
- * NULL terminate the hostname field of the existing entry,
+ * NUL terminate the hostname field of the existing entry,
* and make a dup for the new entry.
*/
*hostdelim++ = '\0';
- nsep->se_hostaddr = xstrdup(hostdelim);
-
+ nsep->se_local_hostname = xstrdup(hostdelim);
nsep->se_next = sep->se_next;
sep->se_next = nsep;
}
- nsep = sep;
- while (nsep != NULL) {
- nsep->se_checked = 1;
- if (nsep->se_family == AF_INET) {
- if (LONE_CHAR(nsep->se_hostaddr, '*'))
- nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
- else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
- int i;
- struct hostent *hp;
-
- hp = gethostbyname(nsep->se_hostaddr);
- if (hp == NULL) {
- bb_error_msg("%s: unknown host", nsep->se_hostaddr);
- nsep->se_checked = 0;
- goto skip;
- }
- if (hp->h_addrtype != AF_INET) {
- bb_error_msg("%s: address isn't an Internet "
- "address", nsep->se_hostaddr);
- nsep->se_checked = 0;
- goto skip;
- }
- i = 1;
- memmove(&nsep->se_ctrladdr_in.sin_addr,
- hp->h_addr_list[0], sizeof(struct in_addr));
- while (hp->h_addr_list[i] != NULL) {
- psep = dupconfig(nsep);
- psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
- psep->se_checked = 1;
- memmove(&psep->se_ctrladdr_in.sin_addr,
- hp->h_addr_list[i], sizeof(struct in_addr));
- psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
- i++;
- /* Prepend to list, don't want to look up */
- /* its hostname again. */
- psep->se_next = sep;
- sep = psep;
- }
- }
- }
-/* XXX BUG?: is this skip: label supposed to remain? */
- skip:
- nsep = nsep->se_next;
- }
-
- /*
- * Finally, free any entries which failed the gethostbyname
- * check.
- */
- psep = NULL;
- nsep = sep;
- while (nsep != NULL) {
- servtab_t *tsep;
-
- if (nsep->se_checked == 0) {
- tsep = nsep;
- if (psep == NULL) {
- sep = nsep->se_next;
- nsep = sep;
- } else {
- nsep = nsep->se_next;
- psep->se_next = nsep;
- }
- freeconfig(tsep);
- } else {
- nsep->se_checked = 0;
- psep = nsep;
- nsep = nsep->se_next;
- }
- }
+ /* Was doing it here: */
+ /* DNS resolution, create copies for each IP address */
return sep;
}
-#define Block_Using_Signals(m) do { \
- sigemptyset(&m); \
- sigaddset(&m, SIGCHLD); \
- sigaddset(&m, SIGHUP); \
- sigaddset(&m, SIGALRM); \
- sigprocmask(SIG_BLOCK, &m, NULL); \
-} while (0)
-
-static servtab_t *enter(servtab_t *cp)
+static servtab_t *insert_in_servlist(servtab_t *cp)
{
servtab_t *sep;
sigset_t omask;
sep = new_servtab();
- *sep = *cp;
+ *sep = *cp; /* struct copy */
sep->se_fd = -1;
#if ENABLE_FEATURE_INETD_RPC
sep->se_rpcprog = -1;
#endif
- Block_Using_Signals(omask);
- sep->se_next = servtab;
- servtab = sep;
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
+ block_CHLD_HUP_ALRM(&omask);
+ sep->se_next = serv_list;
+ serv_list = sep;
+ unblock_sigs(&omask);
return sep;
}
-static int matchconf(servtab_t *old, servtab_t *new)
+static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
{
- if (strcmp(old->se_service, new->se_service) != 0)
+ if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
return 0;
-
- if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0)
+ if (strcmp(old->se_service, new->se_service) != 0)
return 0;
-
if (strcmp(old->se_proto, new->se_proto) != 0)
return 0;
-
- /*
- * If the new servtab is bound to a specific address, check that the
- * old servtab is bound to the same entry. If the new service is not
- * bound to a specific address then the check of se_hostaddr above
- * is sufficient.
- */
-
- if (old->se_family == AF_INET && new->se_family == AF_INET &&
- memcmp(&old->se_ctrladdr_in.sin_addr,
- &new->se_ctrladdr_in.sin_addr,
- sizeof(new->se_ctrladdr_in.sin_addr)) != 0)
- return 0;
-
-#if ENABLE_FEATURE_IPV6
- if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
- memcmp(&old->se_ctrladdr_in6.sin6_addr,
- &new->se_ctrladdr_in6.sin6_addr,
- sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
- return 0;
-#endif
return 1;
}
-static void config(int sig ATTRIBUTE_UNUSED)
+static void reread_config_file(int sig ATTRIBUTE_UNUSED)
{
servtab_t *sep, *cp, **sepp;
+ len_and_sockaddr *lsa;
sigset_t omask;
- size_t n;
- char protoname[10];
+ unsigned n;
+ uint16_t port;
- if (!setconfig()) {
- bb_simple_perror_msg(config_filename);
+ if (!reopen_config_file())
return;
- }
- for (sep = servtab; sep; sep = sep->se_next)
+ for (sep = serv_list; sep; sep = sep->se_next)
sep->se_checked = 0;
- cp = getconfigent();
- while (cp != NULL) {
- for (sep = servtab; sep; sep = sep->se_next)
- if (matchconf(sep, cp))
- break;
- if (sep != 0) {
+ goto first_line;
+ while (1) {
+ if (cp == NULL) {
+ first_line:
+ cp = parse_one_line();
+ if (cp == NULL)
+ break;
+ }
+ for (sep = serv_list; sep; sep = sep->se_next)
+ if (same_serv_addr_proto(sep, cp))
+ goto equal_servtab;
+ /* not an "equal" servtab */
+ sep = insert_in_servlist(cp);
+ goto after_check;
+ equal_servtab:
+ {
int i;
-#define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
-
- Block_Using_Signals(omask);
- /*
- * sep->se_wait may be holding the pid of a daemon
- * that we're waiting for. If so, don't overwrite
- * it unless the config file explicitly says don't
- * wait.
- */
- if (
-#ifdef INETD_FEATURE_ENABLED
- cp->se_bi == 0 &&
-#endif
- (sep->se_wait == 1 || cp->se_wait == 0))
- sep->se_wait = cp->se_wait;
- SWAP(int, cp->se_max, sep->se_max);
- SWAP(char *, sep->se_user, cp->se_user);
- SWAP(char *, sep->se_group, cp->se_group);
- SWAP(char *, sep->se_server, cp->se_server);
- for (i = 0; i < MAXARGV; i++)
- SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
-#undef SWAP
-
+ block_CHLD_HUP_ALRM(&omask);
#if ENABLE_FEATURE_INETD_RPC
- if (isrpcservice(sep))
+ if (is_rpc_service(sep))
unregister_rpc(sep);
- sep->se_rpcversl = cp->se_rpcversl;
- sep->se_rpcversh = cp->se_rpcversh;
+ sep->se_rpcver_lo = cp->se_rpcver_lo;
+ sep->se_rpcver_hi = cp->se_rpcver_hi;
#endif
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- freeconfig(cp);
- } else {
- sep = enter(cp);
+ if (cp->se_wait == 0) {
+ /* New config says "nowait". If old one
+ * was "wait", we currently may be waiting
+ * for a child (and not accepting connects).
+ * Stop waiting, start listening again.
+ * (if it's not true, this op is harmless) */
+ add_fd_to_set(sep->se_fd);
+ }
+ sep->se_wait = cp->se_wait;
+ sep->se_max = cp->se_max;
+ /* string fields need more love - we don't want to leak them */
+#define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
+ SWAP(char*, sep->se_user, cp->se_user);
+ SWAP(char*, sep->se_group, cp->se_group);
+ SWAP(char*, sep->se_program, cp->se_program);
+ for (i = 0; i < MAXARGV; i++)
+ SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
+#undef SWAP
+ unblock_sigs(&omask);
+ free_servtab_strings(cp);
}
+ after_check:
+ /* cp->string_fields are consumed by insert_in_servlist()
+ * or freed at this point, cp itself is not yet freed. */
sep->se_checked = 1;
+ /* create new len_and_sockaddr */
switch (sep->se_family) {
+ struct sockaddr_un *sun;
case AF_UNIX:
- if (sep->se_fd != -1)
- break;
- (void) unlink(sep->se_service);
+ /* we have poor infrastructure for AF_UNIX... */
n = strlen(sep->se_service);
- if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
- n = sizeof sep->se_ctrladdr_un.sun_path - 1;
- safe_strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
- sep->se_ctrladdr_un.sun_family = AF_UNIX;
- sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family;
- setup(sep);
+ if (n > sizeof(sun->sun_path) - 1)
+ n = sizeof(sun->sun_path) - 1;
+ lsa = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
+ lsa->len = sizeof(struct sockaddr_un);
+ sun = (struct sockaddr_un*)&lsa->u.sa;
+ sun->sun_family = AF_UNIX;
+ strncpy(sun->sun_path, sep->se_service, n);
break;
- case AF_INET:
- sep->se_ctrladdr_in.sin_family = AF_INET;
- /* se_ctrladdr_in was set in getconfigent */
- sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
+ default: /* case AF_INET, case AF_INET6 */
+ n = bb_strtou(sep->se_service, NULL, 10);
#if ENABLE_FEATURE_INETD_RPC
- if (isrpcservice(sep)) {
- struct rpcent *rp;
- // FIXME: atoi_or_else(str, 0) would be handy here
- sep->se_rpcprog = atoi(sep->se_service);
- if (sep->se_rpcprog == 0) {
- rp = getrpcbyname(sep->se_service);
- if (rp == 0) {
+ if (is_rpc_service(sep)) {
+ sep->se_rpcprog = n;
+ if (errno) { /* se_service is not numeric */
+ struct rpcent *rp = getrpcbyname(sep->se_service);
+ if (rp == NULL) {
bb_error_msg("%s: unknown rpc service", sep->se_service);
- goto serv_unknown;
+ goto next_cp;
}
sep->se_rpcprog = rp->r_number;
}
if (sep->se_fd == -1)
- setup(sep);
+ prepare_socket_fd(sep);
if (sep->se_fd != -1)
register_rpc(sep);
- } else
-#endif
- {
- uint16_t port = htons(atoi(sep->se_service));
- // FIXME: atoi_or_else(str, 0) would be handy here
- if (!port) {
- /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
- if (isdigit(protoname[strlen(protoname) - 1]))
- protoname[strlen(protoname) - 1] = '\0';
- sp = getservbyname(sep->se_service, protoname);
- if (sp == 0) {
- bb_error_msg("%s/%s: unknown service",
- sep->se_service, sep->se_proto);
- goto serv_unknown;
- }
- port = sp->s_port;
- }
- if (port != sep->se_ctrladdr_in.sin_port) {
- sep->se_ctrladdr_in.sin_port = port;
- if (sep->se_fd != -1) {
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
- (void) close(sep->se_fd);
- }
- sep->se_fd = -1;
- }
- if (sep->se_fd == -1)
- setup(sep);
+ goto next_cp;
}
- break;
-#if ENABLE_FEATURE_IPV6
- case AF_INET6:
- sep->se_ctrladdr_in6.sin6_family = AF_INET6;
- /* se_ctrladdr_in was set in getconfigent */
- sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
-
-#if ENABLE_FEATURE_INETD_RPC
- if (isrpcservice(sep)) {
- struct rpcent *rp;
-
- sep->se_rpcprog = atoi(sep->se_service);
- if (sep->se_rpcprog == 0) {
- rp = getrpcbyname(sep->se_service);
- if (rp == 0) {
- bb_error_msg("%s: unknown rpc service", sep->se_service);
- goto serv_unknown;
- }
- sep->se_rpcprog = rp->r_number;
- }
- if (sep->se_fd == -1)
- setup(sep);
- if (sep->se_fd != -1)
- register_rpc(sep);
- } else
#endif
- {
- uint16_t port = htons(atoi(sep->se_service));
-
- if (!port) {
- /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
- if (isdigit(protoname[strlen(protoname) - 1]))
- protoname[strlen(protoname) - 1] = '\0';
- sp = getservbyname(sep->se_service, protoname);
- if (sp == 0) {
- bb_error_msg("%s/%s: unknown service",
- sep->se_service, sep->se_proto);
- goto serv_unknown;
- }
- port = sp->s_port;
+ /* what port to listen on? */
+ port = htons(n);
+ if (errno || n > 0xffff) { /* se_service is not numeric */
+ char protoname[4];
+ struct servent *sp;
+ /* can result only in "tcp" or "udp": */
+ safe_strncpy(protoname, sep->se_proto, 4);
+ sp = getservbyname(sep->se_service, protoname);
+ if (sp == NULL) {
+ bb_error_msg("%s/%s: unknown service",
+ sep->se_service, sep->se_proto);
+ goto next_cp;
}
- if (port != sep->se_ctrladdr_in6.sin6_port) {
- sep->se_ctrladdr_in6.sin6_port = port;
- if (sep->se_fd != -1) {
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
- (void) close(sep->se_fd);
- }
- sep->se_fd = -1;
+ port = sp->s_port;
+ }
+ if (LONE_CHAR(sep->se_local_hostname, '*')) {
+ lsa = xzalloc_lsa(sep->se_family);
+ set_nport(lsa, port);
+ } else {
+ lsa = host_and_af2sockaddr(sep->se_local_hostname,
+ ntohs(port), sep->se_family);
+ if (!lsa) {
+ bb_error_msg("%s/%s: unknown host '%s'",
+ sep->se_service, sep->se_proto,
+ sep->se_local_hostname);
+ goto next_cp;
}
- if (sep->se_fd == -1)
- setup(sep);
}
break;
-#endif /* FEATURE_IPV6 */
- }
- serv_unknown:
- if (cp->se_next != NULL) {
- servtab_t *tmp = cp;
-
- cp = cp->se_next;
- free(tmp);
+ } /* end of "switch (sep->se_family)" */
+
+ /* did lsa change? Then close/open */
+ if (sep->se_lsa == NULL
+ || lsa->len != sep->se_lsa->len
+ || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
+ ) {
+ remove_fd_from_set(sep->se_fd);
+ maybe_close(sep->se_fd);
+ free(sep->se_lsa);
+ sep->se_lsa = lsa;
+ sep->se_fd = -1;
} else {
- free(cp);
- cp = getconfigent();
+ free(lsa);
}
- }
- endconfig();
- /*
- * Purge anything not looked at above.
- */
- Block_Using_Signals(omask);
- sepp = &servtab;
+ if (sep->se_fd == -1)
+ prepare_socket_fd(sep);
+ next_cp:
+ sep = cp->se_next;
+ free(cp);
+ cp = sep;
+ } /* end of "while (1) parse lines" */
+ close_config_file();
+
+ /* Purge anything not looked at above - these are stale entries,
+ * new config file doesnt have them. */
+ block_CHLD_HUP_ALRM(&omask);
+ sepp = &serv_list;
while ((sep = *sepp)) {
if (sep->se_checked) {
sepp = &sep->se_next;
continue;
}
*sepp = sep->se_next;
- if (sep->se_fd != -1) {
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
- (void) close(sep->se_fd);
- }
+ remove_fd_from_set(sep->se_fd);
+ maybe_close(sep->se_fd);
#if ENABLE_FEATURE_INETD_RPC
- if (isrpcservice(sep))
+ if (is_rpc_service(sep))
unregister_rpc(sep);
#endif
if (sep->se_family == AF_UNIX)
- (void) unlink(sep->se_service);
- freeconfig(sep);
+ unlink(sep->se_service);
+ free_servtab_strings(sep);
free(sep);
}
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
+ unblock_sigs(&omask);
}
-
-static void reapchild(int sig ATTRIBUTE_UNUSED)
+static void reap_child(int sig ATTRIBUTE_UNUSED)
{
pid_t pid;
- int save_errno = errno, status;
+ int status;
servtab_t *sep;
+ int save_errno = errno;
for (;;) {
pid = wait_any_nohang(&status);
if (pid <= 0)
break;
- for (sep = servtab; sep; sep = sep->se_next)
+ for (sep = serv_list; sep; sep = sep->se_next)
if (sep->se_wait == pid) {
+ /* One of our "wait" services */
if (WIFEXITED(status) && WEXITSTATUS(status))
bb_error_msg("%s: exit status 0x%x",
- sep->se_server, WEXITSTATUS(status));
+ sep->se_program, WEXITSTATUS(status));
else if (WIFSIGNALED(status))
bb_error_msg("%s: exit signal 0x%x",
- sep->se_server, WTERMSIG(status));
+ sep->se_program, WTERMSIG(status));
sep->se_wait = 1;
- FD_SET(sep->se_fd, &allsock);
- nsock++;
+ add_fd_to_set(sep->se_fd);
}
}
errno = save_errno;
}
-static void retry(int sig ATTRIBUTE_UNUSED)
+static void retry_network_setup(int sig ATTRIBUTE_UNUSED)
{
servtab_t *sep;
- timingout = 0;
- for (sep = servtab; sep; sep = sep->se_next) {
+ alarm_armed = 0;
+ for (sep = serv_list; sep; sep = sep->se_next) {
if (sep->se_fd == -1) {
- switch (sep->se_family) {
- case AF_UNIX:
- case AF_INET:
-#if ENABLE_FEATURE_IPV6
- case AF_INET6:
-#endif
- setup(sep);
+ prepare_socket_fd(sep);
#if ENABLE_FEATURE_INETD_RPC
- if (sep->se_fd != -1 && isrpcservice(sep))
- register_rpc(sep);
+ if (sep->se_fd != -1 && is_rpc_service(sep))
+ register_rpc(sep);
#endif
- break;
- }
}
}
}
-static void goaway(int sig ATTRIBUTE_UNUSED)
+static void clean_up_and_exit(int sig ATTRIBUTE_UNUSED)
{
servtab_t *sep;
/* XXX signal race walking sep list */
- for (sep = servtab; sep; sep = sep->se_next) {
+ for (sep = serv_list; sep; sep = sep->se_next) {
if (sep->se_fd == -1)
continue;
switch (sep->se_family) {
case AF_UNIX:
- (void) unlink(sep->se_service);
+ unlink(sep->se_service);
break;
- case AF_INET:
-#if ENABLE_FEATURE_IPV6
- case AF_INET6:
-#endif
+ default: /* case AF_INET, AF_INET6 */
#if ENABLE_FEATURE_INETD_RPC
- if (sep->se_wait == 1 && isrpcservice(sep))
+ if (sep->se_wait == 1 && is_rpc_service(sep))
unregister_rpc(sep); /* XXX signal race */
#endif
break;
}
- (void) close(sep->se_fd);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(sep->se_fd);
}
remove_pidfile(_PATH_INETDPID);
exit(0);
}
-
-#ifdef INETD_SETPROCTITLE
-
-static void
-inetd_setproctitle(char *a, int s)
-{
- socklen_t size;
- char *cp;
- struct sockaddr_in prt_sin;
- char buf[80];
-
- cp = Argv[0];
- size = sizeof(prt_sin);
- (void) snprintf(buf, sizeof buf, "-%s", a);
- if (getpeername(s, (struct sockaddr *) &prt_sin, &size) == 0) {
- char *sa = inet_ntoa(prt_sin.sin_addr);
-
- buf[sizeof(buf) - 1 - strlen(sa) - 3] = '\0';
- strcat(buf, " [");
- strcat(buf, sa);
- strcat(buf, "]");
- }
- strncpy(cp, buf, LastArg - cp);
- cp += strlen(cp);
- while (cp < LastArg)
- *cp++ = ' ';
-}
-#endif
-
-
int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int inetd_main(int argc, char **argv)
{
- servtab_t *sep;
+ struct sigaction sa, saved_pipe_handler;
+ servtab_t *sep, *sep2;
struct passwd *pwd;
- struct group *grp = NULL;
- int tmpint;
- struct sigaction sa, sapipe;
+ struct group *grp = grp; /* for compiler */
int opt;
pid_t pid;
- char buf[50];
- char *stoomany;
- sigset_t omask, wait_mask;
-#ifdef INETD_SETPROCTITLE
- char **envp;
-#endif
+ sigset_t omask;
INIT_G();
-#ifdef INETD_SETPROCTITLE
- envp = environ;
- Argv = argv;
- if (envp == 0 || *envp == 0)
- envp = argv;
- while (*envp)
- envp++;
- LastArg = envp[-1] + strlen(envp[-1]);
-#endif
-
- uid = getuid();
- if (uid != 0)
+ real_uid = getuid();
+ if (real_uid != 0) /* run by non-root user */
config_filename = NULL;
- opt = getopt32(argv, "R:f", &stoomany);
- if (opt & 1)
- toomany = xatoi_u(stoomany);
+ opt_complementary = "R+:q+"; /* -q N, -R N */
+ opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
argv += optind;
- argc -= optind;
- if (argc)
+ //argc -= optind;
+ if (argv[0])
config_filename = argv[0];
if (config_filename == NULL)
- bb_error_msg_and_die("non-root must specify a config file");
-
+ bb_error_msg_and_die("non-root must specify config file");
if (!(opt & 2))
bb_daemonize_or_rexec(0, argv - optind);
else
bb_sanitize_stdio();
- openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
- logmode = LOGMODE_SYSLOG;
+ if (!(opt & 4)) {
+ openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
+ logmode = LOGMODE_SYSLOG;
+ }
- if (uid == 0) {
- /* If run by hand, ensure groups vector gets trashed */
+ if (real_uid == 0) {
+ /* run by root, ensure groups vector gets trashed */
gid_t gid = getgid();
setgroups(1, &gid);
}
write_pidfile(_PATH_INETDPID);
- if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
- bb_perror_msg("getrlimit");
- } else {
- rlim_ofile_cur = rlim_ofile.rlim_cur;
- if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
- rlim_ofile_cur = OPEN_MAX;
- }
+ /* never fails under Linux (except if you pass it bad arguments) */
+ getrlimit(RLIMIT_NOFILE, &rlim_ofile);
+ rlim_ofile_cur = rlim_ofile.rlim_cur;
+ if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
+ rlim_ofile_cur = OPEN_MAX;
- memset((char *) &sa, 0, sizeof(sa));
+ memset(&sa, 0, sizeof(sa));
/*sigemptyset(&sa.sa_mask); - memset did it */
sigaddset(&sa.sa_mask, SIGALRM);
sigaddset(&sa.sa_mask, SIGCHLD);
sigaddset(&sa.sa_mask, SIGHUP);
- sa.sa_handler = retry;
+ sa.sa_handler = retry_network_setup;
sigaction(SIGALRM, &sa, NULL);
- config(SIGHUP);
- sa.sa_handler = config;
+ sa.sa_handler = reread_config_file;
sigaction(SIGHUP, &sa, NULL);
- sa.sa_handler = reapchild;
+ sa.sa_handler = reap_child;
sigaction(SIGCHLD, &sa, NULL);
- sa.sa_handler = goaway;
+ sa.sa_handler = clean_up_and_exit;
sigaction(SIGTERM, &sa, NULL);
- sa.sa_handler = goaway;
+ sa.sa_handler = clean_up_and_exit;
sigaction(SIGINT, &sa, NULL);
sa.sa_handler = SIG_IGN;
- sigaction(SIGPIPE, &sa, &sapipe);
- memset(&wait_mask, 0, sizeof(wait_mask));
- {
- /* space for daemons to overwrite environment for ps */
-#define DUMMYSIZE 100
- char dummy[DUMMYSIZE];
+ sigaction(SIGPIPE, &sa, &saved_pipe_handler);
- (void) memset(dummy, 'x', DUMMYSIZE - 1);
- dummy[DUMMYSIZE - 1] = '\0';
-
- (void) setenv("inetd_dummy", dummy, 1);
- }
+ reread_config_file(SIGHUP); /* load config from file */
for (;;) {
- int n, ctrl = -1;
+ int ready_fd_cnt;
+ int ctrl, accepted_fd;
fd_set readable;
- if (nsock == 0) {
- Block_Using_Signals(omask);
- while (nsock == 0)
- sigsuspend(&wait_mask);
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- }
+ if (maxsock < 0)
+ recalculate_maxsock();
- readable = allsock;
- n = select(maxsock + 1, &readable, NULL, NULL, NULL);
- if (n <= 0) {
- if (n < 0 && errno != EINTR) {
+ readable = allsock; /* struct copy */
+ /* if there are no fds to wait on, we will block
+ * until signal wakes us up */
+ ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
+ if (ready_fd_cnt < 0) {
+ if (errno != EINTR) {
bb_perror_msg("select");
sleep(1);
}
continue;
}
- for (sep = servtab; n && sep; sep = sep->se_next) {
+ for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
continue;
- n--;
+ ready_fd_cnt--;
+ ctrl = sep->se_fd;
+ accepted_fd = -1;
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
- ctrl = accept(sep->se_fd, NULL, NULL);
+ ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
if (ctrl < 0) {
- if (errno == EINTR)
- continue;
- bb_perror_msg("accept (for %s)", sep->se_service);
+ if (errno != EINTR)
+ bb_perror_msg("accept (for %s)", sep->se_service);
continue;
}
- if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
- struct sockaddr_in peer;
- socklen_t plen = sizeof(peer);
-
- if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
- bb_error_msg("cannot getpeername");
- close(ctrl);
- continue;
- }
- if (ntohs(peer.sin_port) == 20) {
- /* XXX ftp bounce */
- close(ctrl);
- continue;
- }
- }
- } else
- ctrl = sep->se_fd;
+ }
- Block_Using_Signals(omask);
+ block_CHLD_HUP_ALRM(&omask);
pid = 0;
-#ifdef INETD_FEATURE_ENABLED
- if (sep->se_bi == 0 || sep->se_bi->bi_fork)
+#ifdef INETD_BUILTINS_ENABLED
+ /* do we need to fork? */
+ if (sep->se_builtin == NULL
+ || (sep->se_socktype == SOCK_STREAM
+ && sep->se_builtin->bi_fork))
#endif
{
- if (sep->se_count++ == 0)
- (void) gettimeofday(&sep->se_time, NULL);
- else if (toomany > 0 && sep->se_count >= sep->se_max) {
- struct timeval now;
-
- (void) gettimeofday(&now, NULL);
- if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
- sep->se_time = now;
- sep->se_count = 1;
- } else {
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- if (sep->se_family == AF_INET &&
- ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
- /*
- * Cannot close it -- there are
- * thieves on the system.
- * Simply ignore the connection.
- */
- --sep->se_count;
- continue;
+ if (sep->se_max != 0) {
+ if (++sep->se_count == 1)
+ sep->se_time = monotonic_sec();
+ else if (sep->se_count >= sep->se_max) {
+ unsigned now = monotonic_sec();
+ /* did we accumulate se_max connects too quickly? */
+ if (now - sep->se_time <= CNT_INTERVAL) {
+ bb_error_msg("%s/%s: too many connections, pausing",
+ sep->se_service, sep->se_proto);
+ remove_fd_from_set(sep->se_fd);
+ close(sep->se_fd);
+ sep->se_fd = -1;
+ sep->se_count = 0;
+ rearm_alarm(); /* will revive it in RETRYTIME sec */
+ unblock_sigs(&omask);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
}
- bb_error_msg("%s/%s server failing (looping), service terminated",
- sep->se_service, sep->se_proto);
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- FD_CLR(sep->se_fd, &allsock);
- (void) close(sep->se_fd);
- sep->se_fd = -1;
sep->se_count = 0;
- nsock--;
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- if (!timingout) {
- timingout = 1;
- alarm(RETRYTIME);
- }
- continue;
}
}
- pid = fork();
+ /* on NOMMU, streamed echo, chargen and discard
+ * builtins wouldn't work, but they are
+ * not allowed on NOMMU (ifdefed out) */
+#ifdef INETD_BUILTINS_ENABLED
+ if (BB_MMU && sep->se_builtin)
+ pid = fork();
+ else
+#endif
+ pid = vfork();
+
+ if (pid < 0) { /* fork error */
+ bb_perror_msg("fork");
+ sleep(1);
+ unblock_sigs(&omask);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
+ }
+ if (pid == 0)
+ pid--; /* -1: "we did fork and we are child" */
}
- if (pid < 0) {
- bb_perror_msg("fork");
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- sleep(1);
- continue;
+ /* if pid == 0 here, we never forked */
+
+ if (pid > 0) { /* parent */
+ if (sep->se_wait) {
+ sep->se_wait = pid;
+ remove_fd_from_set(sep->se_fd);
+ /* we passed listening socket to child,
+ * will wait for child to terminate */
+ }
+ unblock_sigs(&omask);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
}
- if (pid && sep->se_wait) {
- sep->se_wait = pid;
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
+
+ /* we are either child or didn't fork at all */
+#ifdef INETD_BUILTINS_ENABLED
+ if (sep->se_builtin) {
+ if (pid) { /* "pid" is -1: we did fork */
+ close(sep->se_fd); /* listening socket */
+ logmode = 0; /* make xwrite etc silent */
+ }
+ unblock_sigs(&omask);
+ if (sep->se_socktype == SOCK_STREAM)
+ sep->se_builtin->bi_stream_fn(ctrl, sep);
+ else
+ sep->se_builtin->bi_dgram_fn(ctrl, sep);
+ if (pid) /* we did fork */
+ _exit(0);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
}
- sigprocmask(SIG_UNBLOCK, &omask, NULL);
- if (pid == 0) {
-#ifdef INETD_FEATURE_ENABLED
- if (sep->se_bi) {
- (*sep->se_bi->bi_fn)(ctrl, sep);
- } else
#endif
- {
- pwd = getpwnam(sep->se_user);
- if (pwd == NULL) {
- bb_error_msg("getpwnam: %s: no such user", sep->se_user);
- goto do_exit1;
- }
- if (setsid() < 0)
- bb_perror_msg("%s: setsid", sep->se_service);
- if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
- bb_error_msg("getgrnam: %s: no such group", sep->se_group);
- goto do_exit1;
- }
- if (uid != 0) {
- /* a user running private inetd */
- if (uid != pwd->pw_uid)
- _exit(1);
- } else if (pwd->pw_uid) {
- if (sep->se_group)
- pwd->pw_gid = grp->gr_gid;
- xsetgid((gid_t) pwd->pw_gid);
- initgroups(pwd->pw_name, pwd->pw_gid);
- xsetuid((uid_t) pwd->pw_uid);
- } else if (sep->se_group) {
- xsetgid(grp->gr_gid);
- setgroups(1, &grp->gr_gid);
- }
- dup2(ctrl, 0);
- if (ctrl) close(ctrl);
- dup2(0, 1);
- dup2(0, 2);
- if (rlim_ofile.rlim_cur != rlim_ofile_cur)
- if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
- bb_perror_msg("setrlimit");
- closelog();
- for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
- (void) close(tmpint);
- sigaction(SIGPIPE, &sapipe, NULL);
- execv(sep->se_server, sep->se_argv);
- bb_perror_msg("execv %s", sep->se_server);
- do_exit1:
- if (sep->se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof(buf), 0);
- _exit(1);
- }
+ /* child. prepare env and exec program */
+ setsid();
+ pwd = getpwnam(sep->se_user);
+ if (pwd == NULL) {
+ bb_error_msg("%s: no such user", sep->se_user);
+ goto do_exit1;
+ }
+ if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
+ bb_error_msg("%s: no such group", sep->se_group);
+ goto do_exit1;
+ }
+ if (real_uid != 0 && real_uid != pwd->pw_uid) {
+ /* a user running private inetd */
+ bb_error_msg("non-root must run services as himself");
+ goto do_exit1;
+ }
+ if (pwd->pw_uid) {
+ if (sep->se_group)
+ pwd->pw_gid = grp->gr_gid;
+ xsetgid(pwd->pw_gid);
+ initgroups(pwd->pw_name, pwd->pw_gid);
+ xsetuid(pwd->pw_uid);
+ } else if (sep->se_group) {
+ xsetgid(grp->gr_gid);
+ setgroups(1, &grp->gr_gid);
}
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
+ if (rlim_ofile.rlim_cur != rlim_ofile_cur)
+ if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
+ bb_perror_msg("setrlimit");
+ closelog();
+ xmove_fd(ctrl, 0);
+ dup2(0, 1);
+ dup2(0, 2);
+ /* NB: among others, this loop closes listening socket
+ * for nowait stream children */
+ for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
+ maybe_close(sep2->se_fd);
+ sigaction(SIGPIPE, &saved_pipe_handler, NULL);
+ unblock_sigs(&omask);
+ BB_EXECVP(sep->se_program, sep->se_argv);
+ bb_perror_msg("exec %s", sep->se_program);
+ do_exit1:
+ /* eat packet in udp case */
+ if (sep->se_socktype != SOCK_STREAM)
+ recv(0, line, LINE_SIZE, MSG_DONTWAIT);
+ _exit(1);
} /* for (sep = servtab...) */
} /* for (;;) */
}
/*
* Internet services provided internally by inetd:
*/
-#define BUFSIZE 4096
-
-#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN || \
- ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
-static int dg_badinput(struct sockaddr_in *dg_sin)
-{
- if (ntohs(dg_sin->sin_port) < IPPORT_RESERVED)
- return 1;
- if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST))
- return 1;
- /* XXX compare against broadcast addresses in SIOCGIFCONF list? */
- return 0;
-}
-#endif
-
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
-/* Echo service -- echo data back */
+/* Echo service -- echo data back. */
/* ARGSUSED */
-static void
-echo_stream(int s, servtab_t *sep)
+static void echo_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[BUFSIZE];
- int i;
-
- inetd_setproctitle(sep->se_service, s);
+#if BB_MMU
while (1) {
- i = read(s, buffer, sizeof(buffer));
- if (i <= 0) break;
- /* FIXME: this isnt correct - safe_write()? */
- if (write(s, buffer, i) <= 0) break;
+ ssize_t sz = safe_read(s, line, LINE_SIZE);
+ if (sz <= 0)
+ break;
+ xwrite(s, line, sz);
}
- exit(0);
+#else
+ static const char *const args[] = { "cat", NULL };
+ BB_EXECVP("cat", (char**)args);
+ _exit(1);
+#endif
}
-
-/* Echo service -- echo data back */
-/* ARGSUSED */
-static void
-echo_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+static void echo_dg(int s, servtab_t *sep)
{
- char buffer[BUFSIZE];
- int i;
- socklen_t size;
- /* struct sockaddr_storage ss; */
- struct sockaddr sa;
-
- size = sizeof(sa);
- i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
- if (i < 0)
- return;
- if (dg_badinput((struct sockaddr_in *) &sa))
- return;
- (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
+ enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
+ char *buf = xmalloc(BUFSIZE); /* too big for stack */
+ int sz;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
+
+ lsa->len = sep->se_lsa->len;
+ /* dgram builtins are non-forking - DONT BLOCK! */
+ sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
+ if (sz > 0)
+ sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
+ free(buf);
}
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
+
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
-/* Discard service -- ignore data */
+/* Discard service -- ignore data. MMU arches only. */
/* ARGSUSED */
-static void
-discard_stream(int s, servtab_t *sep)
+static void discard_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[BUFSIZE];
-
- inetd_setproctitle(sep->se_service, s);
- while (1) {
- if (safe_read(s, buffer, sizeof(buffer)) <= 0)
- exit(0);
- }
+ while (safe_read(s, line, LINE_SIZE) > 0)
+ continue;
}
-
-/* Discard service -- ignore data */
/* ARGSUSED */
-static void
-discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+static void discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[BUFSIZE];
-
- (void) read(s, buffer, sizeof(buffer));
+ /* dgram builtins are non-forking - DONT BLOCK! */
+ recv(s, line, LINE_SIZE, MSG_DONTWAIT);
}
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
#define LINESIZ 72
-
-static void
-initring(void)
+static void initring(void)
{
int i;
if (isprint(i))
*endring++ = i;
}
-
-/* Character generator */
+/* Character generator. MMU arches only. */
/* ARGSUSED */
-static void
-chargen_stream(int s, servtab_t *sep)
+static void chargen_stream(int s, servtab_t *sep)
{
char *rs;
int len;
char text[LINESIZ + 2];
- inetd_setproctitle(sep->se_service, s);
-
if (!endring) {
initring();
rs = ring;
}
if (++rs == endring)
rs = ring;
- if (write(s, text, sizeof(text)) != sizeof(text))
- break;
+ xwrite(s, text, sizeof(text));
}
- exit(0);
}
-
-/* Character generator */
/* ARGSUSED */
-static void
-chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+static void chargen_dg(int s, servtab_t *sep)
{
- /* struct sockaddr_storage ss; */
- struct sockaddr sa;
int len;
char text[LINESIZ + 2];
- socklen_t size;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
+
+ /* Eat UDP packet which started it all */
+ /* dgram builtins are non-forking - DONT BLOCK! */
+ lsa->len = sep->se_lsa->len;
+ if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
+ return;
if (!endring) {
initring();
ringpos = ring;
}
- size = sizeof(sa);
- if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
- return;
- if (dg_badinput((struct sockaddr_in *) &sa))
- return;
-
len = endring - ringpos;
if (len >= LINESIZ)
memmove(text, ringpos, LINESIZ);
ringpos = ring;
text[LINESIZ] = '\r';
text[LINESIZ + 1] = '\n';
- (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
+ sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
}
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
* we must add 2208988800 seconds to this figure to make up for
* some seventy years Bell Labs was asleep.
*/
-
static unsigned machtime(void)
{
struct timeval tv;
- if (gettimeofday(&tv, NULL) < 0) {
- fprintf(stderr, "Unable to get time of day\n");
- return 0L;
- }
- return htonl((unsigned) tv.tv_sec + 2208988800UL);
+ gettimeofday(&tv, NULL);
+ return htonl((uint32_t)(tv.tv_sec + 2208988800));
}
-
/* ARGSUSED */
-static void
-machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+static void machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- unsigned result;
+ uint32_t result;
result = machtime();
- (void) write(s, (char *) &result, sizeof(result));
+ full_write(s, &result, sizeof(result));
}
-
-/* ARGSUSED */
-static void
-machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+static void machtime_dg(int s, servtab_t *sep)
{
- unsigned result;
- /* struct sockaddr_storage ss; */
- struct sockaddr sa;
- struct sockaddr_in *dg_sin;
- socklen_t size;
+ uint32_t result;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
- size = sizeof(sa);
- if (recvfrom(s, (char *) &result, sizeof(result), 0, &sa, &size) < 0)
- return;
- /* if (dg_badinput((struct sockaddr *)&ss)) */
- dg_sin = (struct sockaddr_in *) &sa;
- if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
- ntohs(dg_sin->sin_port) < IPPORT_RESERVED / 2)
+ lsa->len = sep->se_lsa->len;
+ if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
return;
+
result = machtime();
- (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
+ sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
}
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
/* ARGSUSED */
static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[32];
time_t t;
t = time(NULL);
-
-// fdprintf instead?
- (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
- (void) write(s, buffer, strlen(buffer));
+ fdprintf(s, "%.24s\r\n", ctime(&t));
}
-
-/* Return human-readable time of day */
-/* ARGSUSED */
-void
-daytime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+static void daytime_dg(int s, servtab_t *sep)
{
- char buffer[256];
time_t t;
- /* struct sockaddr_storage ss; */
- struct sockaddr sa;
- socklen_t size;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
- t = time(NULL);
-
- size = sizeof(sa);
- if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
- return;
- if (dg_badinput((struct sockaddr_in *) &sa))
+ lsa->len = sep->se_lsa->len;
+ if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
return;
- (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
- (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
+
+ t = time(NULL);
+ sprintf(line, "%.24s\r\n", ctime(&t));
+ sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
}
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */
projects / oweals / busybox.git / commitdiff