Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/usr.sbin/inetd/parse.c

1377 lines
32 KiB
C
Raw Blame History

/* $NetBSD: parse.c,v 1.3 2022/05/22 11:27:37 andvar Exp $ */
/*-
* Copyright (c) 1998, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center and by Matthias Scheler.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1983, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94";
#else
__RCSID("$NetBSD: parse.c,v 1.3 2022/05/22 11:27:37 andvar Exp $");
#endif
#endif /* not lint */
/*
* This file contains code and state for loading and managing servtabs.
* The "positional" syntax parsing is performed in this file. See parse_v2.c
* for "key-values" syntax parsing.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "inetd.h"
static void config(void);
static void endconfig(void);
static struct servtab *enter(struct servtab *);
static struct servtab *getconfigent(char **);
#ifdef DEBUG_ENABLE
static void print_service(const char *, struct servtab *);
#endif
static struct servtab init_servtab(void);
static void include_configs(char *);
static int glob_error(const char *, int);
static void read_glob_configs(char *);
static void prepare_next_config(const char*);
static bool is_same_service(const struct servtab *, const struct servtab *);
static char *gen_file_pattern(const char *, const char *);
static bool check_no_reinclude(const char *);
static void include_matched_path(char *);
static void purge_unchecked(void);
static void freeconfig(struct servtab *);
static char *skip(char **);
size_t line_number;
FILE *fconfig;
/* Temporary storage for new servtab */
static struct servtab serv;
/* Current line from current config file */
static char line[LINE_MAX];
char *defhost;
#ifdef IPSEC
char *policy;
#endif
/*
* Recursively merge loaded service definitions with any defined
* in the current or included config files.
*/
static void
config(void)
{
struct servtab *sep, *cp;
/*
* Current position in line, used with key-values notation,
* saves cp across getconfigent calls.
*/
char *current_pos;
size_t n;
/* open config file from beginning */
fconfig = fopen(CONFIG, "r");
if (fconfig == NULL) {
DPRINTF("Could not open file \"%s\": %s",
CONFIG, strerror(errno));
syslog(LOG_ERR, "%s: %m", CONFIG);
return;
}
/* First call to nextline will advance line_number to 1 */
line_number = 0;
/* Start parsing at the beginning of the first line */
current_pos = nextline(fconfig);
while ((cp = getconfigent(&current_pos)) != NULL) {
/* Find an already existing service definition */
for (sep = servtab; sep != NULL; sep = sep->se_next)
if (is_same_service(sep, cp))
break;
if (sep != NULL) {
int i;
#define SWAP(type, a, b) {type c = a; a = b; b = c;}
/*
* 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 (cp->se_bi == 0 &&
(sep->se_wait == 1 || cp->se_wait == 0))
sep->se_wait = cp->se_wait;
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]);
#ifdef IPSEC
SWAP(char *, sep->se_policy, cp->se_policy);
#endif
SWAP(service_type, cp->se_type, sep->se_type);
SWAP(size_t, cp->se_service_max, sep->se_service_max);
SWAP(size_t, cp->se_ip_max, sep->se_ip_max);
#undef SWAP
if (isrpcservice(sep))
unregister_rpc(sep);
sep->se_rpcversl = cp->se_rpcversl;
sep->se_rpcversh = cp->se_rpcversh;
freeconfig(cp);
#ifdef DEBUG_ENABLE
if (debug)
print_service("REDO", sep);
#endif
} else {
sep = enter(cp);
#ifdef DEBUG_ENABLE
if (debug)
print_service("ADD ", sep);
#endif
}
sep->se_checked = 1;
/*
* Remainder of config(void) checks validity of servtab options
* and sets up the service by setting up sockets
* (in setup(servtab)).
*/
switch (sep->se_family) {
case AF_LOCAL:
if (sep->se_fd != -1)
break;
n = strlen(sep->se_service);
if (n >= sizeof(sep->se_ctrladdr_un.sun_path)) {
syslog(LOG_ERR, "%s/%s: address too long",
sep->se_service, sep->se_proto);
sep->se_checked = 0;
continue;
}
(void)unlink(sep->se_service);
strlcpy(sep->se_ctrladdr_un.sun_path,
sep->se_service, n + 1);
sep->se_ctrladdr_un.sun_family = AF_LOCAL;
sep->se_ctrladdr_size = (socklen_t)(n +
sizeof(sep->se_ctrladdr_un) -
sizeof(sep->se_ctrladdr_un.sun_path));
if (!ISMUX(sep))
setup(sep);
break;
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
{
struct addrinfo hints, *res;
char *host;
const char *port;
int error;
int s;
/* check if the family is supported */
s = socket(sep->se_family, SOCK_DGRAM, 0);
if (s < 0) {
syslog(LOG_WARNING,
"%s/%s: %s: the address family is not "
"supported by the kernel",
sep->se_service, sep->se_proto,
sep->se_hostaddr);
sep->se_checked = false;
continue;
}
close(s);
memset(&hints, 0, sizeof(hints));
hints.ai_family = sep->se_family;
hints.ai_socktype = sep->se_socktype;
hints.ai_flags = AI_PASSIVE;
if (strcmp(sep->se_hostaddr, "*") == 0)
host = NULL;
else
host = sep->se_hostaddr;
if (isrpcservice(sep) || ISMUX(sep))
port = "0";
else
port = sep->se_service;
error = getaddrinfo(host, port, &hints, &res);
if (error != 0) {
if (error == EAI_SERVICE) {
/* gai_strerror not friendly enough */
syslog(LOG_WARNING, SERV_FMT ": "
"unknown service",
SERV_PARAMS(sep));
} else {
syslog(LOG_ERR, SERV_FMT ": %s: %s",
SERV_PARAMS(sep),
sep->se_hostaddr,
gai_strerror(error));
}
sep->se_checked = false;
continue;
}
if (res->ai_next != NULL) {
syslog(LOG_ERR, SERV_FMT
": %s: resolved to multiple addr",
SERV_PARAMS(sep),
sep->se_hostaddr);
sep->se_checked = false;
freeaddrinfo(res);
continue;
}
memcpy(&sep->se_ctrladdr, res->ai_addr,
res->ai_addrlen);
if (ISMUX(sep)) {
sep->se_fd = -1;
freeaddrinfo(res);
continue;
}
sep->se_ctrladdr_size = res->ai_addrlen;
freeaddrinfo(res);
#ifdef 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) {
syslog(LOG_ERR,
SERV_FMT
": unknown service",
SERV_PARAMS(sep));
sep->se_checked = false;
continue;
}
sep->se_rpcprog = rp->r_number;
}
if (sep->se_fd == -1 && !ISMUX(sep))
setup(sep);
if (sep->se_fd != -1)
register_rpc(sep);
} else
#endif
{
if (sep->se_fd >= 0)
close_sep(sep);
if (sep->se_fd == -1 && !ISMUX(sep))
setup(sep);
}
}
}
}
endconfig();
}
static struct servtab *
enter(struct servtab *cp)
{
struct servtab *sep;
sep = malloc(sizeof (*sep));
if (sep == NULL) {
syslog(LOG_ERR, "Out of memory.");
exit(EXIT_FAILURE);
}
*sep = *cp;
sep->se_fd = -1;
sep->se_rpcprog = -1;
sep->se_next = servtab;
servtab = sep;
return (sep);
}
static void
endconfig(void)
{
if (fconfig != NULL) {
(void) fclose(fconfig);
fconfig = NULL;
}
if (defhost != NULL) {
free(defhost);
defhost = NULL;
}
#ifdef IPSEC
if (policy != NULL) {
free(policy);
policy = NULL;
}
#endif
}
#define LOG_EARLY_ENDCONF() \
ERR("Exiting %s early. Some services will be unavailable", CONFIG)
#define LOG_TOO_FEW_ARGS() \
ERR("Expected more arguments")
/* Parse the next service and apply any directives, and returns it as servtab */
static struct servtab *
getconfigent(char **current_pos)
{
struct servtab *sep = &serv;
int argc, val;
char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1;
static char TCPMUX_TOKEN[] = "tcpmux/";
#define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
char *hostdelim;
/*
* Pre-condition: current_pos points into line,
* line contains config line. Continue where the last getconfigent
* left off. Allows for multiple service definitions per line.
*/
cp = *current_pos;
if (/*CONSTCOND*/false) {
/*
* Go to the next line, but only after attempting to read the
* current one! Keep reading until we find a valid definition
* or EOF.
*/
more:
cp = nextline(fconfig);
}
if (cp == NULL) {
/* EOF or I/O error, let config() know to exit the file */
return NULL;
}
/* Comments and IPsec policies */
if (cp[0] == '#') {
#ifdef IPSEC
/* lines starting with #@ is not a comment, but the policy */
if (cp[1] == '@') {
char *p;
for (p = cp + 2; isspace((unsigned char)*p); p++)
;
if (*p == '\0') {
if (policy)
free(policy);
policy = NULL;
} else {
if (ipsecsetup_test(p) < 0) {
ERR("Invalid IPsec policy \"%s\"", p);
LOG_EARLY_ENDCONF();
/*
* Stop reading the current config to
* prevent services from being run
* without IPsec.
*/
return NULL;
} else {
if (policy)
free(policy);
policy = newstr(p);
}
}
}
#endif
goto more;
}
/* Parse next token: listen-addr/hostname, service-spec, .include */
arg = skip(&cp);
if (cp == NULL) {
goto more;
}
if (arg[0] == '.') {
if (strcmp(&arg[1], "include") == 0) {
/* include directive */
arg = skip(&cp);
if (arg == NULL) {
LOG_TOO_FEW_ARGS();
return NULL;
}
include_configs(arg);
goto more;
} else {
ERR("Unknown directive '%s'", &arg[1]);
goto more;
}
}
/* After this point, we might need to store data in a servtab */
*sep = init_servtab();
/* Check for a host name. */
hostdelim = strrchr(arg, ':');
if (hostdelim != NULL) {
*hostdelim = '\0';
if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') {
hostdelim[-1] = '\0';
sep->se_hostaddr = newstr(arg + 1);
} else
sep->se_hostaddr = newstr(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;
goto more;
}
}
} else {
/* No host address found, set it to NULL to indicate absence */
sep->se_hostaddr = NULL;
}
if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
char *c = arg + MUX_LEN;
if (*c == '+') {
sep->se_type = MUXPLUS_TYPE;
c++;
} else
sep->se_type = MUX_TYPE;
sep->se_service = newstr(c);
} else {
sep->se_service = newstr(arg);
sep->se_type = NORM_TYPE;
}
DPRINTCONF("Found service definition '%s'", sep->se_service);
/* on/off/socktype */
arg = skip(&cp);
if (arg == NULL) {
LOG_TOO_FEW_ARGS();
freeconfig(sep);
goto more;
}
/* Check for new v2 syntax */
if (strcmp(arg, "on") == 0 || strncmp(arg, "on#", 3) == 0) {
if (arg[2] == '#') {
cp = nextline(fconfig);
}
switch(parse_syntax_v2(sep, &cp)) {
case V2_SUCCESS:
*current_pos = cp;
return sep;
case V2_SKIP:
/*
* Skip invalid definitions, freeconfig is called in
* parse_v2.c
*/
*current_pos = cp;
freeconfig(sep);
goto more;
case V2_ERROR:
/*
* Unrecoverable error, stop reading. freeconfig
* is called in parse_v2.c
*/
LOG_EARLY_ENDCONF();
freeconfig(sep);
return NULL;
}
} else if (strcmp(arg, "off") == 0 || strncmp(arg, "off#", 4) == 0) {
if (arg[3] == '#') {
cp = nextline(fconfig);
}
/* Parse syntax the same as with 'on', but ignore the result */
switch(parse_syntax_v2(sep, &cp)) {
case V2_SUCCESS:
case V2_SKIP:
*current_pos = cp;
freeconfig(sep);
goto more;
case V2_ERROR:
/* Unrecoverable error, stop reading */
LOG_EARLY_ENDCONF();
freeconfig(sep);
return NULL;
}
} else {
/* continue parsing v1 */
parse_socktype(arg, sep);
if (sep->se_socktype == SOCK_STREAM) {
parse_accept_filter(arg, sep);
}
if (sep->se_hostaddr == NULL) {
/* Set host to current default */
sep->se_hostaddr = newstr(defhost);
}
}
/* protocol */
arg = skip(&cp);
if (arg == NULL) {
LOG_TOO_FEW_ARGS();
freeconfig(sep);
goto more;
}
if (sep->se_type == NORM_TYPE &&
strncmp(arg, "faith/", strlen("faith/")) == 0) {
arg += strlen("faith/");
sep->se_type = FAITH_TYPE;
}
sep->se_proto = newstr(arg);
#define MALFORMED(arg) \
do { \
ERR("%s: malformed buffer size option `%s'", \
sep->se_service, (arg)); \
freeconfig(sep); \
goto more; \
} while (false)
#define GETVAL(arg) \
do { \
if (!isdigit((unsigned char)*(arg))) \
MALFORMED(arg); \
val = (int)strtol((arg), &cp0, 10); \
if (cp0 != NULL) { \
if (cp0[1] != '\0') \
MALFORMED((arg)); \
if (cp0[0] == 'k') \
val *= 1024; \
if (cp0[0] == 'm') \
val *= 1024 * 1024; \
} \
if (val < 1) { \
ERR("%s: invalid buffer size `%s'", \
sep->se_service, (arg)); \
freeconfig(sep); \
goto more; \
} \
} while (false)
#define ASSIGN(arg) \
do { \
if (strcmp((arg), "sndbuf") == 0) \
sep->se_sndbuf = val; \
else if (strcmp((arg), "rcvbuf") == 0) \
sep->se_rcvbuf = val; \
else \
MALFORMED((arg)); \
} while (false)
/*
* Extract the send and receive buffer sizes before parsing
* the protocol.
*/
sep->se_sndbuf = sep->se_rcvbuf = 0;
buf0 = buf1 = sz0 = sz1 = NULL;
if ((buf0 = strchr(sep->se_proto, ',')) != NULL) {
/* Not meaningful for Tcpmux services. */
if (ISMUX(sep)) {
ERR("%s: can't specify buffer sizes for "
"tcpmux services", sep->se_service);
goto more;
}
/* Skip the , */
*buf0++ = '\0';
/* Check to see if another socket buffer size was specified. */
if ((buf1 = strchr(buf0, ',')) != NULL) {
/* Skip the , */
*buf1++ = '\0';
/* Make sure a 3rd one wasn't specified. */
if (strchr(buf1, ',') != NULL) {
ERR("%s: too many buffer sizes",
sep->se_service);
goto more;
}
/* Locate the size. */
if ((sz1 = strchr(buf1, '=')) == NULL)
MALFORMED(buf1);
/* Skip the = */
*sz1++ = '\0';
}
/* Locate the size. */
if ((sz0 = strchr(buf0, '=')) == NULL)
MALFORMED(buf0);
/* Skip the = */
*sz0++ = '\0';
GETVAL(sz0);
ASSIGN(buf0);
if (buf1 != NULL) {
GETVAL(sz1);
ASSIGN(buf1);
}
}
#undef ASSIGN
#undef GETVAL
#undef MALFORMED
if (parse_protocol(sep)) {
freeconfig(sep);
goto more;
}
/* wait/nowait:max */
arg = skip(&cp);
if (arg == NULL) {
LOG_TOO_FEW_ARGS();
freeconfig(sep);
goto more;
}
/* Rate limiting parsing */ {
char *cp1;
if ((cp1 = strchr(arg, ':')) == NULL)
cp1 = strchr(arg, '.');
if (cp1 != NULL) {
int rstatus;
*cp1++ = '\0';
sep->se_service_max = (size_t)strtou(cp1, NULL, 10, 0,
SERVTAB_COUNT_MAX, &rstatus);
if (rstatus != 0) {
if (rstatus != ERANGE) {
/* For compatibility w/ atoi parsing */
sep->se_service_max = 0;
}
WRN("Improper \"max\" value '%s', "
"using '%zu' instead: %s",
cp1,
sep->se_service_max,
strerror(rstatus));
}
} else
sep->se_service_max = TOOMANY;
}
if (parse_wait(sep, strcmp(arg, "wait") == 0)) {
freeconfig(sep);
goto more;
}
/* Parse user:group token */
arg = skip(&cp);
if (arg == NULL) {
LOG_TOO_FEW_ARGS();
freeconfig(sep);
goto more;
}
char* separator = strchr(arg, ':');
if (separator == NULL) {
/* Backwards compatibility, allow dot instead of colon */
separator = strchr(arg, '.');
}
if (separator == NULL) {
/* Only user was specified */
sep->se_group = NULL;
} else {
*separator = '\0';
sep->se_group = newstr(separator + 1);
}
sep->se_user = newstr(arg);
/* Parser server-program (path to binary or "internal") */
arg = skip(&cp);
if (arg == NULL) {
LOG_TOO_FEW_ARGS();
freeconfig(sep);
goto more;
}
if (parse_server(sep, arg)) {
freeconfig(sep);
goto more;
}
argc = 0;
for (arg = skip(&cp); cp != NULL; arg = skip(&cp)) {
if (argc < MAXARGV)
sep->se_argv[argc++] = newstr(arg);
}
while (argc <= MAXARGV)
sep->se_argv[argc++] = NULL;
#ifdef IPSEC
sep->se_policy = policy != NULL ? newstr(policy) : NULL;
#endif
/* getconfigent read a positional service def, move to next line */
*current_pos = nextline(fconfig);
return (sep);
}
void
freeconfig(struct servtab *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]);
#ifdef IPSEC
free(cp->se_policy);
#endif
}
/*
* Get next token *in the current service definition* from config file.
* Allows multi-line parse if single space or single tab-indented.
* Things in quotes are considered single token.
* Advances cp to next token.
*/
static char *
skip(char **cpp)
{
char *cp = *cpp;
char *start;
char quote;
if (*cpp == NULL)
return (NULL);
again:
while (*cp == ' ' || *cp == '\t')
cp++;
if (*cp == '\0') {
int c;
c = getc(fconfig);
(void) ungetc(c, fconfig);
if (c == ' ' || c == '\t')
if ((cp = nextline(fconfig)) != NULL)
goto again;
*cpp = NULL;
return (NULL);
}
start = cp;
/* Parse shell-style quotes */
quote = '\0';
while (*cp != '\0' && (quote != '\0' || (*cp != ' ' && *cp != '\t'))) {
if (*cp == '\'' || *cp == '"') {
if (quote != '\0' && *cp != quote)
cp++;
else {
if (quote != '\0')
quote = '\0';
else
quote = *cp;
memmove(cp, cp+1, strlen(cp));
}
} else
cp++;
}
if (*cp != '\0')
*cp++ = '\0';
*cpp = cp;
return (start);
}
char *
nextline(FILE *fd)
{
char *cp;
if (fgets(line, (int)sizeof(line), fd) == NULL) {
if (ferror(fd) != 0) {
ERR("Error when reading next line: %s",
strerror(errno));
}
return NULL;
}
cp = strchr(line, '\n');
if (cp != NULL)
*cp = '\0';
line_number++;
return line;
}
char *
newstr(const char *cp)
{
char *dp;
if ((dp = strdup((cp != NULL) ? cp : "")) != NULL)
return (dp);
syslog(LOG_ERR, "strdup: %m");
exit(EXIT_FAILURE);
/*NOTREACHED*/
}
#ifdef DEBUG_ENABLE
/*
* print_service:
* Dump relevant information to stderr
*/
static void
print_service(const char *action, struct servtab *sep)
{
if (isrpcservice(sep))
fprintf(stderr,
"%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, "
"wait.max=%d.%zu, "
"user:group=%s:%s builtin=%lx server=%s"
#ifdef IPSEC
" policy=\"%s\""
#endif
"\n",
action, sep->se_service,
sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl,
sep->se_proto, sep->se_wait, sep->se_service_max,
sep->se_user, sep->se_group,
(long)sep->se_bi, sep->se_server
#ifdef IPSEC
, (sep->se_policy != NULL ? sep->se_policy : "")
#endif
);
else
fprintf(stderr,
"%s: %s:%s proto=%s%s, wait.max=%d.%zu, user:group=%s:%s "
"builtin=%lx "
"server=%s"
#ifdef IPSEC
" policy=%s"
#endif
"\n",
action, sep->se_hostaddr, sep->se_service,
sep->se_type == FAITH_TYPE ? "faith/" : "",
sep->se_proto,
sep->se_wait, sep->se_service_max, sep->se_user,
sep->se_group, (long)sep->se_bi, sep->se_server
#ifdef IPSEC
, (sep->se_policy != NULL ? sep->se_policy : "")
#endif
);
}
#endif
void
config_root(void)
{
struct servtab *sep;
/* Uncheck services */
for (sep = servtab; sep != NULL; sep = sep->se_next) {
sep->se_checked = false;
}
defhost = newstr("*");
#ifdef IPSEC
policy = NULL;
#endif
fconfig = NULL;
config();
purge_unchecked();
}
static void
purge_unchecked(void)
{
struct servtab *sep, **sepp = &servtab;
int servtab_count = 0;
while ((sep = *sepp) != NULL) {
if (sep->se_checked) {
sepp = &sep->se_next;
servtab_count++;
continue;
}
*sepp = sep->se_next;
if (sep->se_fd >= 0)
close_sep(sep);
if (isrpcservice(sep))
unregister_rpc(sep);
if (sep->se_family == AF_LOCAL)
(void)unlink(sep->se_service);
#ifdef DEBUG_ENABLE
if (debug)
print_service("FREE", sep);
#endif
freeconfig(sep);
free(sep);
}
DPRINTF("%d service(s) loaded.", servtab_count);
}
static bool
is_same_service(const struct servtab *sep, const struct servtab *cp)
{
return
strcmp(sep->se_service, cp->se_service) == 0 &&
strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 &&
strcmp(sep->se_proto, cp->se_proto) == 0 &&
sep->se_family == cp->se_family &&
ISMUX(sep) == ISMUX(cp);
}
int
parse_protocol(struct servtab *sep)
{
int val;
if (strcmp(sep->se_proto, "unix") == 0) {
sep->se_family = AF_LOCAL;
} else {
val = (int)strlen(sep->se_proto);
if (val == 0) {
ERR("%s: invalid protocol specified",
sep->se_service);
return -1;
}
val = sep->se_proto[val - 1];
switch (val) {
case '4': /*tcp4 or udp4*/
sep->se_family = AF_INET;
break;
#ifdef INET6
case '6': /*tcp6 or udp6*/
sep->se_family = AF_INET6;
break;
#endif
default:
/*
* Use 'default' IP version which is IPv4, may
* eventually be changed to AF_INET6
*/
sep->se_family = AF_INET;
break;
}
if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
#ifdef RPC
char *cp1, *ccp;
cp1 = strchr(sep->se_service, '/');
if (cp1 == 0) {
ERR("%s: no rpc version",
sep->se_service);
return -1;
}
*cp1++ = '\0';
sep->se_rpcversl = sep->se_rpcversh =
(int)strtol(cp1, &ccp, 0);
if (ccp == cp1) {
badafterall:
ERR("%s/%s: bad rpc version",
sep->se_service, cp1);
return -1;
}
if (*ccp == '-') {
cp1 = ccp + 1;
sep->se_rpcversh = (int)strtol(cp1, &ccp, 0);
if (ccp == cp1)
goto badafterall;
}
#else
ERR("%s: rpc services not supported",
sep->se_service);
return -1;
#endif /* RPC */
}
}
return 0;
}
int
parse_wait(struct servtab *sep, int wait)
{
if (!ISMUX(sep)) {
sep->se_wait = wait;
return 0;
}
/*
* Silently enforce "nowait" for TCPMUX services since
* they don't have an assigned port to listen on.
*/
sep->se_wait = 0;
if (strncmp(sep->se_proto, "tcp", 3)) {
ERR("bad protocol for tcpmux service %s",
sep->se_service);
return -1;
}
if (sep->se_socktype != SOCK_STREAM) {
ERR("bad socket type for tcpmux service %s",
sep->se_service);
return -1;
}
return 0;
}
int
parse_server(struct servtab *sep, const char *arg)
{
sep->se_server = newstr(arg);
if (strcmp(sep->se_server, "internal") != 0) {
sep->se_bi = NULL;
return 0;
}
if (!try_biltin(sep)) {
ERR("Internal service %s unknown", sep->se_service);
return -1;
}
return 0;
}
/* TODO test to make sure accept filter still works */
void
parse_accept_filter(char *arg, struct servtab *sep)
{
char *accf, *accf_arg;
/* one and only one accept filter */
accf = strchr(arg, ':');
if (accf == NULL)
return;
if (accf != strrchr(arg, ':') || *(accf + 1) == '\0') {
/* more than one || nothing beyond */
sep->se_socktype = -1;
return;
}
accf++; /* skip delimiter */
strlcpy(sep->se_accf.af_name, accf, sizeof(sep->se_accf.af_name));
accf_arg = strchr(accf, ',');
if (accf_arg == NULL) /* zero or one arg, no more */
return;
if (strrchr(accf, ',') != accf_arg) {
sep->se_socktype = -1;
} else {
accf_arg++;
strlcpy(sep->se_accf.af_arg, accf_arg,
sizeof(sep->se_accf.af_arg));
}
}
void
parse_socktype(char* arg, struct servtab* sep)
{
/* stream socket may have an accept filter, only check first chars */
if (strncmp(arg, "stream", sizeof("stream") - 1) == 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;
}
static struct servtab
init_servtab(void)
{
/* This does not set every field to default. See enter() as well */
return (struct servtab) {
/*
* Set se_max to non-zero so uninitialized value is not
* a valid value. Useful in v2 syntax parsing.
*/
.se_service_max = SERVTAB_UNSPEC_SIZE_T,
.se_ip_max = SERVTAB_UNSPEC_SIZE_T,
.se_wait = SERVTAB_UNSPEC_VAL,
.se_socktype = SERVTAB_UNSPEC_VAL,
.se_rl_ip_list = SLIST_HEAD_INITIALIZER(se_ip_list_head)
/* All other fields initialized to 0 or null */
};
}
/* Include directives bookkeeping structure */
struct file_list {
/* Absolute path used for checking for circular references */
char *abs;
/* Pointer to the absolute path of the parent config file,
* on the stack */
struct file_list *next;
} *file_list_head;
static void
include_configs(char *pattern)
{
/* Allocate global per-config state on the thread stack */
const char* save_CONFIG;
FILE *save_fconfig;
size_t save_line_number;
char *save_defhost;
struct file_list new_file;
#ifdef IPSEC
char *save_policy;
#endif
/* Store current globals on the stack */
save_CONFIG = CONFIG;
save_fconfig = fconfig;
save_line_number = line_number;
save_defhost = defhost;
new_file.abs = realpath(CONFIG, NULL);
new_file.next = file_list_head;
#ifdef IPSEC
save_policy = policy;
#endif
/* Put new_file at the top of the config stack */
file_list_head = &new_file;
read_glob_configs(pattern);
free(new_file.abs);
/* Pop new_file off the stack */
file_list_head = new_file.next;
/* Restore global per-config state */
CONFIG = save_CONFIG;
fconfig = save_fconfig;
line_number = save_line_number;
defhost = save_defhost;
#ifdef IPSEC
policy = save_policy;
#endif
}
static void
prepare_next_config(const char *file_name)
{
/* Setup new state that is normally only done in main */
CONFIG = file_name;
/* Inherit default host and IPsec policy */
defhost = newstr(defhost);
#ifdef IPSEC
policy = (policy == NULL) ? NULL : newstr(policy);
#endif
}
static void
read_glob_configs(char *pattern)
{
glob_t results;
char *full_pattern;
int glob_result;
full_pattern = gen_file_pattern(CONFIG, pattern);
DPRINTCONF("Found include directive '%s'", full_pattern);
glob_result = glob(full_pattern, GLOB_NOSORT, glob_error, &results);
switch(glob_result) {
case 0:
/* No glob errors */
break;
case GLOB_ABORTED:
ERR("Error while searching for include files");
break;
case GLOB_NOMATCH:
/* It's fine if no files were matched. */
DPRINTCONF("No files matched pattern '%s'", full_pattern);
break;
case GLOB_NOSPACE:
ERR("Error when searching for include files: %s",
strerror(errno));
break;
default:
ERR("Unknown glob(3) error %d", errno);
break;
}
free(full_pattern);
for (size_t i = 0; i < results.gl_pathc; i++) {
include_matched_path(results.gl_pathv[i]);
}
globfree(&results);
}
static void
include_matched_path(char *glob_path)
{
struct stat sb;
char *tmp;
if (lstat(glob_path, &sb) != 0) {
ERR("Error calling stat on path '%s': %s", glob_path,
strerror(errno));
return;
}
if (!S_ISREG(sb.st_mode) && !S_ISLNK(sb.st_mode)) {
DPRINTCONF("'%s' is not a file.", glob_path);
ERR("The matched path '%s' is not a regular file", glob_path);
return;
}
DPRINTCONF("Include '%s'", glob_path);
if (S_ISLNK(sb.st_mode)) {
tmp = glob_path;
glob_path = realpath(tmp, NULL);
}
/* Ensure the file is not being reincluded .*/
if (check_no_reinclude(glob_path)) {
prepare_next_config(glob_path);
config();
} else {
DPRINTCONF("File '%s' already included in current include "
"chain", glob_path);
WRN("Including file '%s' would cause a circular "
"dependency", glob_path);
}
if (S_ISLNK(sb.st_mode)) {
free(glob_path);
glob_path = tmp;
}
}
static bool
check_no_reinclude(const char *glob_path)
{
struct file_list *cur = file_list_head;
char *abs_path = realpath(glob_path, NULL);
if (abs_path == NULL) {
ERR("Error checking real path for '%s': %s",
glob_path, strerror(errno));
return false;
}
DPRINTCONF("Absolute path '%s'", abs_path);
for (cur = file_list_head; cur != NULL; cur = cur->next) {
if (strcmp(cur->abs, abs_path) == 0) {
/* file included more than once */
/* TODO relative or abs path for logging error? */
free(abs_path);
return false;
}
}
free(abs_path);
return true;
}
/* Resolve the pattern relative to the config file the pattern is from */
static char *
gen_file_pattern(const char *cur_config, const char *pattern)
{
if (pattern[0] == '/') {
/* Absolute paths don't need any normalization */
return newstr(pattern);
}
/* pattern is relative */
/* Find the end of the file's directory */
size_t i, last = 0;
for (i = 0; cur_config[i] != '\0'; i++) {
if (cur_config[i] == '/') {
last = i;
}
}
if (last == 0) {
/* cur_config is just a filename, pattern already correct */
return newstr(pattern);
}
/* Relativize pattern to cur_config file's directory */
char *full_pattern = malloc(last + 1 + strlen(pattern) + 1);
if (full_pattern == NULL) {
syslog(LOG_ERR, "Out of memory.");
exit(EXIT_FAILURE);
}
memcpy(full_pattern, cur_config, last);
full_pattern[last] = '/';
strcpy(&full_pattern[last + 1], pattern);
return full_pattern;
}
static int
glob_error(const char *path, int error)
{
WRN("Error while resolving path '%s': %s", path, strerror(error));
return 0;
}
Reference in New Issue View Git Blame Copy Permalink