File: [local] / src / usr.sbin / snmpd / parse.y (download)
Revision 1.90, Tue Feb 20 12:32:48 2024 UTC (3 months, 1 week ago) by martijn
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, HEAD
Changes since 1.89: +8 -4 lines
trap receiver is special in that the OID is optional. Make sure that we
accept a NULL descriptor, which results in an OID length of 0.
Found by and OK sthen@
|
/* $OpenBSD: parse.y,v 1.90 2024/02/20 12:32:48 martijn Exp $ */
/*
* Copyright (c) 2007, 2008, 2012 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
* Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
* Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
* Copyright (c) 2001 Theo de Raadt. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
%{
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <openssl/sha.h>
#include <ber.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <inttypes.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <strings.h>
#include <syslog.h>
#include <unistd.h>
#include "application.h"
#include "log.h"
#include "mib.h"
#include "snmpd.h"
#include "snmp.h"
TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
static struct file {
TAILQ_ENTRY(file) entry;
FILE *stream;
char *name;
size_t ungetpos;
size_t ungetsize;
u_char *ungetbuf;
int eof_reached;
int lineno;
int errors;
} *file, *topfile;
struct file *pushfile(const char *, int);
int popfile(void);
int check_file_secrecy(int, const char *);
int yyparse(void);
int yylex(void);
int yyerror(const char *, ...)
__attribute__((__format__ (printf, 1, 2)))
__attribute__((__nonnull__ (1)));
int kw_cmp(const void *, const void *);
int lookup(char *);
int igetc(void);
int lgetc(int);
void lungetc(int);
int findeol(void);
TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
struct sym {
TAILQ_ENTRY(sym) entry;
int used;
int persist;
char *nam;
char *val;
};
int symset(const char *, const char *, int);
char *symget(const char *);
struct oid_sym {
char *descriptor;
char file[PATH_MAX];
int lineno;
};
struct object_sym {
struct oid_sym oid;
char *name;
int isint;
union {
int32_t intval;
char *sval;
};
};
struct trapcmd_sym {
struct oid_sym oid;
struct trapcmd *cmd;
};
struct trapaddress_sym {
struct oid_sym oid;
struct trap_address *tr;
};
struct snmpd *conf = NULL;
static int errors = 0;
static struct usmuser *user = NULL;
static int mibparsed = 0;
static struct oid_sym *blocklist = NULL;
static size_t nblocklist = 0;
static struct oid_sym sysoid = {};
static struct object_sym *objects = NULL;
static size_t nobjects = 0;
static struct trapcmd_sym *trapcmds = NULL;
static size_t ntrapcmds = 0;
static struct trapaddress_sym *trapaddresses = NULL;
static size_t ntrapaddresses = 0;
static uint8_t engineid[SNMPD_MAXENGINEIDLEN];
static int32_t enginepen;
static size_t engineidlen;
int resolve_oid(struct ber_oid *, struct oid_sym *);
int resolve_oids(void);
int host(const char *, const char *, int, int,
struct sockaddr_storage *, int);
int listen_add(struct sockaddr_storage *, int, int);
typedef struct {
union {
int64_t number;
char *string;
struct host *host;
struct timeval tv;
struct oid_sym oid;
struct agentx_master ax;
struct {
int type;
void *data;
long long value;
} data;
enum usmauth auth;
enum usmpriv enc;
} v;
int lineno;
} YYSTYPE;
#define axm_opts axm_fd
#define AXM_PATH 1 << 0
#define AXM_OWNER 1 << 1
#define AXM_GROUP 1 << 2
#define AXM_MODE 1 << 3
%}
%token INCLUDE
%token LISTEN ON READ WRITE NOTIFY SNMPV1 SNMPV2 SNMPV3
%token AGENTX PATH OWNER GROUP MODE
%token ENGINEID PEN OPENBSD IP4 IP6 MAC TEXT OCTETS AGENTID HOSTHASH
%token SYSTEM CONTACT DESCR LOCATION NAME OBJECTID SERVICES RTFILTER
%token READONLY READWRITE OCTETSTRING INTEGER COMMUNITY TRAP RECEIVER
%token SECLEVEL NONE AUTH ENC USER AUTHKEY ENCKEY ERROR
%token HANDLE DEFAULT SRCADDR TCP UDP BLOCKLIST PORT
%token MIB DIRECTORY
%token <v.string> STRING
%token <v.number> NUMBER
%type <v.string> usmuser community optcommunity
%type <v.number> listenproto listenflag listenflags
%type <v.string> srcaddr port
%type <v.number> optwrite yesno seclevel
%type <v.data> cmd hostauth hostauthv3 usmauthopts usmauthopt
%type <v.oid> oid hostoid trapoid
%type <v.auth> auth
%type <v.enc> enc
%type <v.ax> agentxopts agentxopt
%%
grammar : /* empty */
| grammar include '\n'
| grammar '\n'
| grammar varset '\n'
| grammar main '\n'
| grammar system '\n'
| grammar object '\n'
| grammar mib '\n'
| grammar error '\n' { file->errors++; }
;
include : INCLUDE STRING {
struct file *nfile;
if ((nfile = pushfile($2, 0)) == NULL) {
yyerror("failed to include file %s", $2);
free($2);
YYERROR;
}
free($2);
file = nfile;
lungetc('\n');
}
;
varset : STRING '=' STRING {
char *s = $1;
while (*s++) {
if (isspace((unsigned char)*s)) {
yyerror("macro name cannot contain "
"whitespace");
free($1);
free($3);
YYERROR;
}
}
if (symset($1, $3, 0) == -1)
fatal("cannot store variable");
free($1);
free($3);
}
;
yesno : STRING {
if (!strcmp($1, "yes"))
$$ = 1;
else if (!strcmp($1, "no"))
$$ = 0;
else {
yyerror("syntax error, "
"either yes or no expected");
free($1);
YYERROR;
}
free($1);
}
;
main : LISTEN ON listen_udptcp
| AGENTX agentxopts {
struct agentx_master *master, *test;
struct group *grp;
if ((master = malloc(sizeof(*master))) == NULL) {
yyerror("malloc");
YYERROR;
}
master->axm_fd = -1;
master->axm_sun.sun_len = sizeof(master->axm_sun);
master->axm_sun.sun_family = AF_UNIX;
if ($2.axm_opts & AXM_PATH)
strlcpy(master->axm_sun.sun_path,
$2.axm_sun.sun_path,
sizeof(master->axm_sun.sun_path));
else
strlcpy(master->axm_sun.sun_path,
AGENTX_MASTER_PATH,
sizeof(master->axm_sun.sun_path));
master->axm_owner = $2.axm_opts & AXM_OWNER ?
$2.axm_owner : 0;
if ($2.axm_opts & AXM_GROUP)
master->axm_group = $2.axm_group;
else {
if ((grp = getgrnam(AGENTX_GROUP)) == NULL) {
yyerror("agentx: group %s not found",
AGENTX_GROUP);
YYERROR;
}
master->axm_group = grp->gr_gid;
}
master->axm_mode = $2.axm_opts & AXM_MODE ?
$2.axm_mode : 0660;
TAILQ_FOREACH(test, &conf->sc_agentx_masters,
axm_entry) {
if (strcmp(test->axm_sun.sun_path,
master->axm_sun.sun_path) == 0) {
yyerror("agentx: duplicate entry: %s",
test->axm_sun.sun_path);
YYERROR;
}
}
TAILQ_INSERT_TAIL(&conf->sc_agentx_masters, master,
axm_entry);
}
| engineid_local {
if (conf->sc_engineid_len != 0) {
yyerror("Redefinition of engineid");
YYERROR;
}
memcpy(conf->sc_engineid, engineid, engineidlen);
conf->sc_engineid_len = engineidlen;
}
| READONLY COMMUNITY STRING {
if (strlcpy(conf->sc_rdcommunity, $3,
sizeof(conf->sc_rdcommunity)) >=
sizeof(conf->sc_rdcommunity)) {
yyerror("r/o community name too long");
free($3);
YYERROR;
}
free($3);
}
| READWRITE COMMUNITY STRING {
if (strlcpy(conf->sc_rwcommunity, $3,
sizeof(conf->sc_rwcommunity)) >=
sizeof(conf->sc_rwcommunity)) {
yyerror("r/w community name too long");
free($3);
YYERROR;
}
free($3);
}
| TRAP COMMUNITY STRING {
if (strlcpy(conf->sc_trcommunity, $3,
sizeof(conf->sc_trcommunity)) >=
sizeof(conf->sc_trcommunity)) {
yyerror("trap community name too long");
free($3);
YYERROR;
}
free($3);
}
| TRAP RECEIVER host
| TRAP HANDLE trapoid cmd {
struct trapcmd_sym *ttrapcmds;
if ((ttrapcmds = recallocarray(trapcmds, ntrapcmds,
ntrapcmds + 1, sizeof(*trapcmds))) == NULL) {
yyerror("malloc");
free($3.descriptor);
free($4.data);
YYERROR;
}
trapcmds = ttrapcmds;
trapcmds[ntrapcmds].oid = $3;
trapcmds[ntrapcmds++].cmd = $4.data;
}
| BLOCKLIST oid {
struct oid_sym *tblocklist;
if ((tblocklist = recallocarray(blocklist, nblocklist,
nblocklist + 1, sizeof(*blocklist))) == NULL) {
yyerror("malloc");
free($2.descriptor);
YYERROR;
}
blocklist = tblocklist;
blocklist[nblocklist++] = $2;
}
| RTFILTER yesno {
conf->sc_rtfilter = $2;
}
| seclevel {
conf->sc_min_seclevel = $1;
}
| USER STRING {
const char *errstr;
user = usm_newuser($2, &errstr);
if (user == NULL) {
yyerror("%s", errstr);
free($2);
YYERROR;
}
} userspecs {
const char *errstr;
if (usm_checkuser(user, &errstr) < 0) {
yyerror("%s", errstr);
YYERROR;
}
user = NULL;
}
;
listenproto : /* empty */ { $$ = SOCK_DGRAM; }
| UDP { $$ = SOCK_DGRAM; }
| TCP { $$ = SOCK_STREAM; }
;
listenflags : /* empty */ { $$ = 0; }
| listenflags listenflag { $$ |= $2; }
;
listenflag : READ { $$ = ADDRESS_FLAG_READ; }
| WRITE { $$ = ADDRESS_FLAG_WRITE; }
| NOTIFY { $$ = ADDRESS_FLAG_NOTIFY; }
| SNMPV1 { $$ = ADDRESS_FLAG_SNMPV1; }
| SNMPV2 { $$ = ADDRESS_FLAG_SNMPV2; }
| SNMPV3 { $$ = ADDRESS_FLAG_SNMPV3; }
;
listen_udptcp : listenproto STRING port listenflags {
struct sockaddr_storage ss[16];
int nhosts, j;
char *address[2], *port = $3;
size_t addresslen = 1, i;
if (port == NULL) {
if (($4 & ADDRESS_FLAG_PERM) ==
ADDRESS_FLAG_NOTIFY)
port = SNMPTRAP_PORT;
else
port = SNMP_PORT;
}
if (strcmp($2, "any") == 0) {
addresslen = 2;
address[0] = "0.0.0.0";
address[1] = "::";
} else {
addresslen = 1;
address[0] = $2;
}
for (i = 0; i < addresslen; i++) {
if ((nhosts = host(address[i], port, AF_UNSPEC,
$1, ss, nitems(ss))) < 1) {
yyerror("invalid address: %s", $2);
free($2);
free($3);
YYERROR;
}
if (nhosts > (int)nitems(ss))
log_warn("%s:%s resolves to more than "
"%zu hosts", $2, port, nitems(ss));
for (j = 0; j < nhosts; j++) {
if (listen_add(&(ss[j]), $1, $4) == -1) {
yyerror("calloc");
YYERROR;
}
}
}
free($2);
free($3);
}
;
port : /* empty */ {
$$ = NULL;
}
| PORT STRING {
$$ = $2;
}
| PORT NUMBER {
char *number;
if ($2 > UINT16_MAX) {
yyerror("port number too large");
YYERROR;
}
if ($2 < 1) {
yyerror("port number too small");
YYERROR;
}
if (asprintf(&number, "%"PRId64, $2) == -1) {
yyerror("malloc");
YYERROR;
}
$$ = number;
}
;
agentxopt : PATH STRING {
if ($2[0] != '/') {
yyerror("agentx path: must be absolute");
YYERROR;
}
if (strlcpy($$.axm_sun.sun_path, $2,
sizeof($$.axm_sun.sun_path)) >=
sizeof($$.axm_sun.sun_path)) {
yyerror("agentx path: too long");
YYERROR;
}
$$.axm_opts = AXM_PATH;
}
| OWNER NUMBER {
if ($2 > UID_MAX) {
yyerror("agentx owner: too large");
YYERROR;
}
$$.axm_owner = $2;
$$.axm_opts = AXM_OWNER;
}
| OWNER STRING {
struct passwd *pw;
const char *errstr;
$$.axm_owner = strtonum($2, 0, UID_MAX, &errstr);
if (errstr != NULL && errno == ERANGE) {
yyerror("agentx owner: %s", errstr);
YYERROR;
}
if ((pw = getpwnam($2)) == NULL) {
yyerror("agentx owner: user not found");
YYERROR;
}
$$.axm_owner = pw->pw_uid;
$$.axm_opts = AXM_OWNER;
}
| GROUP NUMBER {
if ($2 > GID_MAX) {
yyerror("agentx group: too large");
YYERROR;
}
$$.axm_group = $2;
$$.axm_opts = AXM_GROUP;
}
| GROUP STRING {
struct group *gr;
const char *errstr;
$$.axm_group = strtonum($2, 0, GID_MAX, &errstr);
if (errstr != NULL && errno == ERANGE) {
yyerror("agentx group: %s", errstr);
YYERROR;
}
if ((gr = getgrnam($2)) == NULL) {
yyerror("agentx group: group not found");
YYERROR;
}
$$.axm_group = gr->gr_gid;
$$.axm_opts = AXM_GROUP;
}
| MODE NUMBER {
long mode;
char *endptr, str[21];
snprintf(str, sizeof(str), "%lld", $2);
errno = 0;
mode = strtol(str, &endptr, 8);
if (errno != 0 || endptr[0] != '\0' ||
mode <= 0 || mode > 0777) {
yyerror("agentx mode: invalid");
YYERROR;
}
$$.axm_mode = mode;
$$.axm_opts = AXM_MODE;
}
;
agentxopts : /* empty */ {
bzero(&$$, sizeof($$));
}
| agentxopts agentxopt {
if ($$.axm_opts & $2.axm_opts) {
yyerror("agentx: duplicate option");
YYERROR;
}
switch ($2.axm_opts) {
case AXM_PATH:
strlcpy($$.axm_sun.sun_path,
$2.axm_sun.sun_path,
sizeof($$.axm_sun.sun_path));
break;
case AXM_OWNER:
$$.axm_owner = $2.axm_owner;
break;
case AXM_GROUP:
$$.axm_group = $2.axm_group;
break;
case AXM_MODE:
$$.axm_mode = $2.axm_mode;
break;
}
$$.axm_opts |= $2.axm_opts;
}
;
enginefmt : IP4 STRING {
struct in_addr addr;
engineid[engineidlen++] = SNMP_ENGINEID_FMT_IPv4;
if (inet_pton(AF_INET, $2, &addr) != 1) {
yyerror("Invalid ipv4 address: %s", $2);
free($2);
YYERROR;
}
memcpy(engineid + engineidlen, &addr,
sizeof(engineid) - engineidlen);
engineid[0] |= SNMP_ENGINEID_NEW;
engineidlen += sizeof(addr);
free($2);
}
| IP6 STRING {
struct in6_addr addr;
engineid[engineidlen++] = SNMP_ENGINEID_FMT_IPv6;
if (inet_pton(AF_INET6, $2, &addr) != 1) {
yyerror("Invalid ipv6 address: %s", $2);
free($2);
YYERROR;
}
memcpy(engineid + engineidlen, &addr,
sizeof(engineid) - engineidlen);
engineid[0] |= SNMP_ENGINEID_NEW;
engineidlen += sizeof(addr);
free($2);
}
| MAC STRING {
size_t i;
if (strlen($2) != 5 * 3 + 2) {
yyerror("Invalid mac address: %s", $2);
free($2);
YYERROR;
}
engineid[engineidlen++] = SNMP_ENGINEID_FMT_MAC;
for (i = 0; i < 6; i++) {
if (fromhexstr(engineid + engineidlen + i,
$2 + (i * 3), 2) == NULL ||
$2[i * 3 + 2] != (i < 5 ? ':' : '\0')) {
yyerror("Invalid mac address: %s", $2);
free($2);
YYERROR;
}
}
engineid[0] |= SNMP_ENGINEID_NEW;
engineidlen += 6;
free($2);
}
| TEXT STRING {
size_t i, fmtstart;
engineid[engineidlen++] = SNMP_ENGINEID_FMT_TEXT;
for (i = 0, fmtstart = engineidlen;
i < sizeof(engineid) - engineidlen && $2[i] != '\0';
i++) {
if (!isprint($2[i])) {
yyerror("invalid text character");
free($2);
YYERROR;
}
engineid[fmtstart + i] = $2[i];
engineidlen++;
}
if (i == 0 || $2[i] != '\0') {
yyerror("Invalid text length: %s", $2);
free($2);
YYERROR;
}
engineid[0] |= SNMP_ENGINEID_NEW;
free($2);
}
| OCTETS STRING {
if (strlen($2) / 2 > sizeof(engineid) - 1) {
yyerror("Invalid octets length: %s", $2);
free($2);
YYERROR;
}
engineid[engineidlen++] = SNMP_ENGINEID_FMT_OCT;
if (fromhexstr(engineid + engineidlen, $2,
strlen($2)) == NULL) {
yyerror("Invalid octets: %s", $2);
free($2);
YYERROR;
}
engineidlen += strlen($2) / 2;
engineid[0] |= SNMP_ENGINEID_NEW;
free($2);
}
| AGENTID STRING {
if (strlen($2) / 2 != 8) {
yyerror("Invalid agentid length: %s", $2);
free($2);
YYERROR;
}
if (fromhexstr(engineid + engineidlen, $2,
strlen($2)) == NULL) {
yyerror("Invalid agentid: %s", $2);
free($2);
YYERROR;
}
engineidlen += 8;
engineid[0] |= SNMP_ENGINEID_OLD;
free($2);
}
| HOSTHASH STRING {
if (enginepen != PEN_OPENBSD) {
yyerror("hosthash only allowed for pen "
"openbsd");
YYERROR;
}
engineid[engineidlen++] = SNMP_ENGINEID_FMT_HH;
memcpy(engineid + engineidlen,
SHA256($2, strlen($2), NULL),
sizeof(engineid) - engineidlen);
engineidlen = sizeof(engineid);
engineid[0] |= SNMP_ENGINEID_NEW;
free($2);
}
| NUMBER STRING {
if (enginepen == PEN_OPENBSD) {
yyerror("%lld is only allowed when pen is not "
"openbsd", $1);
YYERROR;
}
if ($1 < 128 || $1 > 255) {
yyerror("Invalid format number: %lld\n", $1);
YYERROR;
}
if (strlen($2) / 2 > sizeof(engineid) - 1) {
yyerror("Invalid octets length: %s", $2);
free($2);
YYERROR;
}
engineid[engineidlen++] = (uint8_t)$1;
if (fromhexstr(engineid + engineidlen, $2,
strlen($2)) == NULL) {
yyerror("Invalid octets: %s", $2);
free($2);
YYERROR;
}
engineidlen += strlen($2) / 2;
engineid[0] |= SNMP_ENGINEID_NEW;
free($2);
}
;
enginefmt_local : enginefmt
| HOSTHASH {
char hostname[HOST_NAME_MAX + 1];
if (enginepen != PEN_OPENBSD) {
yyerror("hosthash only allowed for pen "
"openbsd");
YYERROR;
}
if (gethostname(hostname, sizeof(hostname)) == -1) {
yyerror("gethostname: %s", strerror(errno));
YYERROR;
}
engineid[engineidlen++] = SNMP_ENGINEID_FMT_HH;
memcpy(engineid + engineidlen,
SHA256(hostname, strlen(hostname), NULL),
sizeof(engineid) - engineidlen);
engineidlen = sizeof(engineid);
engineid[0] |= SNMP_ENGINEID_NEW;
}
;
pen : /* empty */ {
enginepen = PEN_OPENBSD;
}
| PEN NUMBER {
if ($2 > INT32_MAX) {
yyerror("pen number too large");
YYERROR;
}
if ($2 <= 0) {
yyerror("pen number too small");
YYERROR;
}
enginepen = $2;
}
| PEN OPENBSD {
enginepen = PEN_OPENBSD;
}
;
engineid_local : ENGINEID pen {
uint32_t npen = htonl(enginepen);
memcpy(engineid, &npen, sizeof(enginepen));
engineidlen = sizeof(enginepen);
} enginefmt_local
system : SYSTEM sysmib
;
sysmib : CONTACT STRING {
if (conf->sc_system.sys_contact[0] != '\0') {
yyerror("system contact already defined");
free($2);
YYERROR;
}
if (strlcpy(conf->sc_system.sys_contact, $2,
sizeof(conf->sc_system.sys_contact)) >=
sizeof(conf->sc_system.sys_contact)) {
yyerror("system contact too long");
free($2);
YYERROR;
}
free($2);
}
| DESCR STRING {
if (conf->sc_system.sys_descr[0] != '\0') {
yyerror("system description already defined");
free($2);
YYERROR;
}
if (strlcpy(conf->sc_system.sys_descr, $2,
sizeof(conf->sc_system.sys_descr)) >=
sizeof(conf->sc_system.sys_descr)) {
yyerror("system description too long");
free($2);
YYERROR;
}
free($2);
}
| LOCATION STRING {
if (conf->sc_system.sys_location[0] != '\0') {
yyerror("system location already defined");
free($2);
YYERROR;
}
if (strlcpy(conf->sc_system.sys_location, $2,
sizeof(conf->sc_system.sys_location)) >=
sizeof(conf->sc_system.sys_location)) {
yyerror("system location too long");
free($2);
YYERROR;
}
free($2);
}
| NAME STRING {
if (conf->sc_system.sys_name[0] != '\0') {
yyerror("system name already defined");
free($2);
YYERROR;
}
if (strlcpy(conf->sc_system.sys_name, $2,
sizeof(conf->sc_system.sys_name)) >=
sizeof(conf->sc_system.sys_name)) {
yyerror("system name too long");
free($2);
YYERROR;
}
free($2);
}
| OBJECTID oid {
if (sysoid.descriptor != NULL) {
yyerror("system oid already defined");
free($2.descriptor);
YYERROR;
}
sysoid = $2;
}
| SERVICES NUMBER {
if (conf->sc_system.sys_services != -1) {
yyerror("system services already defined");
YYERROR;
}
if ($2 < 0) {
yyerror("system services too small");
YYERROR;
} else if ($2 > 127) {
yyerror("system services too large");
YYERROR;
}
conf->sc_system.sys_services = $2;
}
;
object : OBJECTID oid NAME STRING optwrite {
struct object_sym *tobjects;
if ((tobjects = recallocarray(objects, nobjects,
nobjects + 1, sizeof(*objects))) == NULL) {
yyerror("malloc");
free($2.descriptor);
free($4);
}
objects = tobjects;
nobjects++;
objects[nobjects - 1].oid = $2;
objects[nobjects - 1].name = $4;
} objectvalue
;
objectvalue : INTEGER NUMBER {
if ($2 < INT32_MIN) {
yyerror("number too small");
YYERROR;
}
if ($2 > INT32_MAX) {
yyerror("number too large");
YYERROR;
}
objects[nobjects - 1].isint = 1;
objects[nobjects - 1].intval = $2;
}
| OCTETSTRING STRING {
objects[nobjects - 1].isint = 0;
objects[nobjects - 1].sval = $2;
}
;
optwrite : READONLY { $$ = 0; }
| READWRITE { $$ = 1; }
;
oid : STRING {
$$.descriptor = $1;
strlcpy($$.file, file->name, sizeof($$.file));
$$.lineno = file->lineno;
}
;
trapoid : oid { $$ = $1; }
| DEFAULT {
if (($$.descriptor = strdup("1.3")) == NULL) {
yyerror("malloc");
YYERROR;
}
strlcpy($$.file, file->name, sizeof($$.file));
$$.lineno = file->lineno;
}
;
hostoid : /* empty */ {
$$.descriptor = NULL;
strlcpy($$.file, file->name, sizeof($$.file));
$$.lineno = file->lineno;
}
| OBJECTID oid { $$ = $2; }
;
usmuser : USER STRING {
if (strlen($2) > SNMPD_MAXUSERNAMELEN) {
yyerror("User name too long: %s", $2);
free($2);
YYERROR;
}
$$ = $2;
}
;
community : COMMUNITY STRING {
if (strlen($2) > SNMPD_MAXCOMMUNITYLEN) {
yyerror("Community too long: %s", $2);
free($2);
YYERROR;
}
$$ = $2;
}
;
optcommunity : /* empty */ { $$ = NULL; }
| community { $$ = $1; }
;
usmauthopt : usmuser {
$$.data = $1;
$$.value = -1;
}
| seclevel {
$$.data = 0;
$$.value = $1;
}
;
usmauthopts : /* empty */ {
$$.data = NULL;
$$.value = -1;
}
| usmauthopts usmauthopt {
if ($2.data != NULL) {
if ($$.data != NULL) {
yyerror("user redefined");
free($2.data);
YYERROR;
}
$$.data = $2.data;
} else {
if ($$.value != -1) {
yyerror("seclevel redefined");
YYERROR;
}
$$.value = $2.value;
}
}
;
hostauthv3 : usmauthopts {
if ($1.data == NULL) {
yyerror("user missing");
YYERROR;
}
$$.data = $1.data;
$$.value = $1.value;
}
;
hostauth : hostauthv3 {
$$.type = SNMP_V3;
$$.data = $1.data;
$$.value = $1.value;
}
| SNMPV2 optcommunity {
$$.type = SNMP_V2;
$$.data = $2;
}
| SNMPV3 hostauthv3 {
$$.type = SNMP_V3;
$$.data = $2.data;
$$.value = $2.value;
}
;
srcaddr : /* empty */ { $$ = NULL; }
| SRCADDR STRING { $$ = $2; }
;
hostdef : STRING hostoid hostauth srcaddr {
struct sockaddr_storage ss, ssl = {};
struct trap_address *tr;
struct trapaddress_sym *ttrapaddresses;
if (host($1, SNMPTRAP_PORT, AF_UNSPEC, SOCK_DGRAM,
&ss, 1) <= 0) {
yyerror("invalid host: %s", $1);
free($1);
free($2.descriptor);
free($3.data);
free($4);
YYERROR;
}
free($1);
if ($4 != NULL) {
if (host($4, "0", ss.ss_family, SOCK_DGRAM,
&ss, 1) <= 0) {
yyerror("invalid source-address: %s",
$4);
free($2.descriptor);
free($3.data);
free($4);
YYERROR;
}
free($4);
}
ttrapaddresses = reallocarray(trapaddresses,
ntrapaddresses + 1, sizeof(*trapaddresses));
if (ttrapaddresses == NULL) {
yyerror("malloc");
free($2.descriptor);
free($3.data);
YYERROR;
}
trapaddresses = ttrapaddresses;
ntrapaddresses++;
if ((tr = calloc(1, sizeof(*tr))) == NULL) {
yyerror("calloc");
free($2.descriptor);
free($3.data);
ntrapaddresses--;
YYERROR;
}
tr->ta_ss = ss;
tr->ta_sslocal = ssl;
tr->ta_version = $3.type;
if ($3.type == SNMP_V2) {
(void)strlcpy(tr->ta_community, $3.data,
sizeof(tr->ta_community));
free($3.data);
} else {
tr->ta_usmusername = $3.data;
tr->ta_seclevel = $3.value;
}
trapaddresses[ntrapaddresses - 1].oid = $2;
trapaddresses[ntrapaddresses - 1].tr = tr;
}
;
hostlist : /* empty */
| hostlist comma hostdef
;
host : hostdef
| '{' hostlist '}'
;
comma : /* empty */
| ','
;
seclevel : SECLEVEL NONE { $$ = 0; }
| SECLEVEL AUTH { $$ = SNMP_MSGFLAG_AUTH; }
| SECLEVEL ENC { $$ = SNMP_MSGFLAG_AUTH | SNMP_MSGFLAG_PRIV; }
;
userspecs : /* empty */
| userspecs userspec
;
userspec : AUTHKEY STRING {
user->uu_authkey = $2;
}
| AUTH auth {
user->uu_auth = $2;
}
| ENCKEY STRING {
user->uu_privkey = $2;
}
| ENC enc {
user->uu_priv = $2;
}
;
auth : STRING {
if (strcasecmp($1, "hmac-md5") == 0 ||
strcasecmp($1, "hmac-md5-96") == 0)
$$ = AUTH_MD5;
else if (strcasecmp($1, "hmac-sha1") == 0 ||
strcasecmp($1, "hmac-sha1-96") == 0)
$$ = AUTH_SHA1;
else if (strcasecmp($1, "hmac-sha224") == 0 ||
strcasecmp($1, "usmHMAC128SHA224AuthProtocol") == 0)
$$ = AUTH_SHA224;
else if (strcasecmp($1, "hmac-sha256") == 0 ||
strcasecmp($1, "usmHMAC192SHA256AuthProtocol") == 0)
$$ = AUTH_SHA256;
else if (strcasecmp($1, "hmac-sha384") == 0 ||
strcasecmp($1, "usmHMAC256SHA384AuthProtocol") == 0)
$$ = AUTH_SHA384;
else if (strcasecmp($1, "hmac-sha512") == 0 ||
strcasecmp($1, "usmHMAC384SHA512AuthProtocol") == 0)
$$ = AUTH_SHA512;
else {
yyerror("syntax error, bad auth hmac");
free($1);
YYERROR;
}
free($1);
}
;
enc : STRING {
if (strcasecmp($1, "des") == 0 ||
strcasecmp($1, "cbc-des") == 0)
$$ = PRIV_DES;
else if (strcasecmp($1, "aes") == 0 ||
strcasecmp($1, "cfb128-aes-128") == 0)
$$ = PRIV_AES;
else {
yyerror("syntax error, bad encryption cipher");
free($1);
YYERROR;
}
free($1);
}
;
cmd : STRING {
struct trapcmd *cmd;
size_t span, limit;
char *pos, **args, **args2;
int nargs = 32; /* XXX */
if ((cmd = calloc(1, sizeof(*cmd))) == NULL ||
(args = calloc(nargs, sizeof(char *))) == NULL) {
free(cmd);
free($1);
YYERROR;
}
pos = $1;
limit = strlen($1);
while (pos < $1 + limit &&
(span = strcspn(pos, " \t")) != 0) {
pos[span] = '\0';
args[cmd->cmd_argc] = strdup(pos);
if (args[cmd->cmd_argc] == NULL) {
trapcmd_free(cmd);
free(args);
free($1);
YYERROR;
}
cmd->cmd_argc++;
if (cmd->cmd_argc >= nargs - 1) {
nargs *= 2;
args2 = calloc(nargs, sizeof(char *));
if (args2 == NULL) {
trapcmd_free(cmd);
free(args);
free($1);
YYERROR;
}
args = args2;
}
pos += span + 1;
}
free($1);
cmd->cmd_argv = args;
$$.data = cmd;
}
;
mib : MIB DIRECTORY STRING {
mib_parsedir($3);
mibparsed = 1;
}
;
%%
struct keywords {
const char *k_name;
int k_val;
};
int
yyerror(const char *fmt, ...)
{
va_list ap;
char *msg;
file->errors++;
va_start(ap, fmt);
if (vasprintf(&msg, fmt, ap) == -1)
fatalx("yyerror vasprintf");
va_end(ap);
logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
free(msg);
return (0);
}
int
kw_cmp(const void *k, const void *e)
{
return (strcmp(k, ((const struct keywords *)e)->k_name));
}
int
lookup(char *s)
{
/* this has to be sorted always */
static const struct keywords keywords[] = {
{ "agentid", AGENTID },
{ "agentx", AGENTX },
{ "auth", AUTH },
{ "authkey", AUTHKEY },
{ "blocklist", BLOCKLIST },
{ "community", COMMUNITY },
{ "contact", CONTACT },
{ "default", DEFAULT },
{ "description", DESCR },
{ "directory", DIRECTORY },
{ "enc", ENC },
{ "enckey", ENCKEY },
{ "engineid", ENGINEID },
{ "filter-routes", RTFILTER },
{ "group", GROUP },
{ "handle", HANDLE },
{ "hosthash", HOSTHASH },
{ "include", INCLUDE },
{ "integer", INTEGER },
{ "ipv4", IP4 },
{ "ipv6", IP6 },
{ "listen", LISTEN },
{ "location", LOCATION },
{ "mac", MAC },
{ "mib", MIB },
{ "mode", MODE },
{ "name", NAME },
{ "none", NONE },
{ "notify", NOTIFY },
{ "octets", OCTETS },
{ "oid", OBJECTID },
{ "on", ON },
{ "openbsd", OPENBSD },
{ "owner", OWNER },
{ "path", PATH },
{ "pen", PEN },
{ "port", PORT },
{ "read", READ },
{ "read-only", READONLY },
{ "read-write", READWRITE },
{ "receiver", RECEIVER },
{ "seclevel", SECLEVEL },
{ "services", SERVICES },
{ "snmpv1", SNMPV1 },
{ "snmpv2c", SNMPV2 },
{ "snmpv3", SNMPV3 },
{ "source-address", SRCADDR },
{ "string", OCTETSTRING },
{ "system", SYSTEM },
{ "tcp", TCP },
{ "text", TEXT },
{ "trap", TRAP },
{ "udp", UDP },
{ "user", USER },
{ "write", WRITE }
};
const struct keywords *p;
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p)
return (p->k_val);
else
return (STRING);
}
#define START_EXPAND 1
#define DONE_EXPAND 2
static int expanding;
int
igetc(void)
{
int c;
while (1) {
if (file->ungetpos > 0)
c = file->ungetbuf[--file->ungetpos];
else c = getc(file->stream);
if (c == START_EXPAND)
expanding = 1;
else if (c == DONE_EXPAND)
expanding = 0;
else
break;
}
return (c);
}
int
lgetc(int quotec)
{
int c, next;
if (quotec) {
if ((c = igetc()) == EOF) {
yyerror("reached end of file while parsing quoted string");
if (file == topfile || popfile() == EOF)
return (EOF);
return (quotec);
}
return (c);
}
while ((c = igetc()) == '\\') {
next = igetc();
if (next != '\n') {
c = next;
break;
}
yylval.lineno = file->lineno;
file->lineno++;
}
if (c == '\t' || c == ' ') {
/* Compress blanks to a single space. */
do {
c = getc(file->stream);
} while (c == '\t' || c == ' ');
ungetc(c, file->stream);
c = ' ';
}
if (c == EOF) {
/*
* Fake EOL when hit EOF for the first time. This gets line
* count right if last line in included file is syntactically
* invalid and has no newline.
*/
if (file->eof_reached == 0) {
file->eof_reached = 1;
return ('\n');
}
while (c == EOF) {
if (file == topfile || popfile() == EOF)
return (EOF);
c = igetc();
}
}
return (c);
}
void
lungetc(int c)
{
if (c == EOF)
return;
if (file->ungetpos >= file->ungetsize) {
void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
if (p == NULL)
err(1, "%s", __func__);
file->ungetbuf = p;
file->ungetsize *= 2;
}
file->ungetbuf[file->ungetpos++] = c;
}
int
findeol(void)
{
int c;
/* skip to either EOF or the first real EOL */
while (1) {
c = lgetc(0);
if (c == '\n') {
file->lineno++;
break;
}
if (c == EOF)
break;
}
return (ERROR);
}
int
yylex(void)
{
char buf[8096];
char *p, *val;
int quotec, next, c;
int token;
top:
p = buf;
while ((c = lgetc(0)) == ' ' || c == '\t')
; /* nothing */
yylval.lineno = file->lineno;
if (c == '#')
while ((c = lgetc(0)) != '\n' && c != EOF)
; /* nothing */
if (c == '$' && !expanding) {
while (1) {
if ((c = lgetc(0)) == EOF)
return (0);
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
if (isalnum(c) || c == '_') {
*p++ = c;
continue;
}
*p = '\0';
lungetc(c);
break;
}
val = symget(buf);
if (val == NULL) {
yyerror("macro '%s' not defined", buf);
return (findeol());
}
p = val + strlen(val) - 1;
lungetc(DONE_EXPAND);
while (p >= val) {
lungetc((unsigned char)*p);
p--;
}
lungetc(START_EXPAND);
goto top;
}
switch (c) {
case '\'':
case '"':
quotec = c;
while (1) {
if ((c = lgetc(quotec)) == EOF)
return (0);
if (c == '\n') {
file->lineno++;
continue;
} else if (c == '\\') {
if ((next = lgetc(quotec)) == EOF)
return (0);
if (next == quotec || next == ' ' ||
next == '\t')
c = next;
else if (next == '\n') {
file->lineno++;
continue;
} else
lungetc(next);
} else if (c == quotec) {
*p = '\0';
break;
} else if (c == '\0') {
yyerror("syntax error");
return (findeol());
}
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
*p++ = c;
}
yylval.v.string = strdup(buf);
if (yylval.v.string == NULL)
err(1, "%s", __func__);
return (STRING);
}
#define allowed_to_end_number(x) \
(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
if (c == '-' || isdigit(c)) {
do {
*p++ = c;
if ((size_t)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(0)) != EOF && isdigit(c));
lungetc(c);
if (p == buf + 1 && buf[0] == '-')
goto nodigits;
if (c == EOF || allowed_to_end_number(c)) {
const char *errstr = NULL;
*p = '\0';
yylval.v.number = strtonum(buf, LLONG_MIN,
LLONG_MAX, &errstr);
if (errstr) {
yyerror("\"%s\" invalid number: %s",
buf, errstr);
return (findeol());
}
return (NUMBER);
} else {
nodigits:
while (p > buf + 1)
lungetc((unsigned char)*--p);
c = (unsigned char)*--p;
if (c == '-')
return (c);
}
}
#define allowed_in_string(x) \
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
x != '{' && x != '}' && \
x != '!' && x != '=' && x != '#' && \
x != ','))
if (isalnum(c) || c == ':' || c == '_') {
do {
*p++ = c;
if ((size_t)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
lungetc(c);
*p = '\0';
if ((token = lookup(buf)) == STRING)
if ((yylval.v.string = strdup(buf)) == NULL)
err(1, "%s", __func__);
return (token);
}
if (c == '\n') {
yylval.lineno = file->lineno;
file->lineno++;
}
if (c == EOF)
return (0);
return (c);
}
int
check_file_secrecy(int fd, const char *fname)
{
struct stat st;
if (fstat(fd, &st)) {
log_warn("cannot stat %s", fname);
return (-1);
}
if (st.st_uid != 0 && st.st_uid != getuid()) {
log_warnx("%s: owner not root or current user", fname);
return (-1);
}
if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
log_warnx("%s: group writable or world read/writable", fname);
return (-1);
}
return (0);
}
struct file *
pushfile(const char *name, int secret)
{
struct file *nfile;
if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
log_warn("%s", __func__);
return (NULL);
}
if ((nfile->name = strdup(name)) == NULL) {
log_warn("%s", __func__);
free(nfile);
return (NULL);
}
if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
log_warn("%s: %s", __func__, nfile->name);
free(nfile->name);
free(nfile);
return (NULL);
} else if (secret &&
check_file_secrecy(fileno(nfile->stream), nfile->name)) {
fclose(nfile->stream);
free(nfile->name);
free(nfile);
return (NULL);
}
nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
nfile->ungetsize = 16;
nfile->ungetbuf = malloc(nfile->ungetsize);
if (nfile->ungetbuf == NULL) {
log_warn("%s", __func__);
fclose(nfile->stream);
free(nfile->name);
free(nfile);
return (NULL);
}
TAILQ_INSERT_TAIL(&files, nfile, entry);
return (nfile);
}
int
popfile(void)
{
struct file *prev;
if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
prev->errors += file->errors;
TAILQ_REMOVE(&files, file, entry);
fclose(file->stream);
free(file->name);
free(file->ungetbuf);
free(file);
file = prev;
return (file ? 0 : EOF);
}
int
resolve_oid(struct ber_oid *dst, struct oid_sym *src)
{
struct file f = { .name = src->file, };
const char *error;
file = &f;
yylval.lineno = src->lineno;
if ((error = mib_string2oid(src->descriptor, dst)) != NULL) {
if (smi_string2oid(src->descriptor, dst) == -1) {
yyerror("%s", error);
free(src->descriptor);
return -1;
}
yyerror("deprecated oid format");
}
free(src->descriptor);
return 0;
}
int
resolve_oids(void)
{
struct file f;
struct ber_oid oid;
const char *error;
size_t i;
conf->sc_blocklist = calloc(nblocklist, sizeof(*conf->sc_blocklist));
if (conf->sc_blocklist == NULL)
fatal("malloc");
conf->sc_nblocklist = nblocklist;
for (i = 0; i < nblocklist; i++) {
if (resolve_oid(&conf->sc_blocklist[i], &blocklist[i]) == -1)
return -1;
}
free(blocklist);
if (sysoid.descriptor != NULL) {
if (resolve_oid(&conf->sc_system.sys_oid, &sysoid) == -1)
return -1;
}
for (i = 0; i < nobjects; i++) {
if (resolve_oid(&oid, &objects[i].oid) == -1)
return -1;
file = &f;
f.name = objects[i].oid.file;
yylval.lineno = objects[i].oid.lineno;
if ((error = smi_insert(&oid, objects[i].name)) != NULL) {
yyerror("%s", error);
return -1;
}
if (objects[i].isint) {
if ((error = appl_internal_object_int(
&oid, objects[i].intval)) != NULL) {
yyerror("%s", error);
return -1;
}
} else {
if ((error = appl_internal_object_string(
&oid, objects[i].sval)) != NULL) {
yyerror("%s", error);
return -1;
}
}
free(objects[i].name);
}
free(objects);
for (i = 0; i < ntrapcmds; i++) {
if (resolve_oid(
&trapcmds[i].cmd->cmd_oid, &trapcmds[i].oid) == -1)
return -1;
f.name = trapcmds[i].oid.file;
yylval.lineno = trapcmds[i].oid.lineno;
file = &f;
if (trapcmd_add(trapcmds[i].cmd) != 0) {
yyerror("duplicate oid");
return -1;
}
}
free(trapcmds);
for (i = 0; i < ntrapaddresses; i++) {
if (trapaddresses[i].oid.descriptor == NULL)
trapaddresses[i].tr->ta_oid.bo_n = 0;
else {
if (resolve_oid(&trapaddresses[i].tr->ta_oid,
&trapaddresses[i].oid) == -1)
return -1;
}
TAILQ_INSERT_TAIL(&conf->sc_trapreceivers,
trapaddresses[i].tr, entry);
}
free(trapaddresses);
return 0;
}
struct snmpd *
parse_config(const char *filename, u_int flags)
{
struct sockaddr_storage ss;
struct utsname u;
struct sym *sym, *next;
struct address *h;
struct trap_address *tr;
const struct usmuser *up;
const char *errstr;
char hostname[HOST_NAME_MAX + 1];
int found;
uint32_t npen = htonl(PEN_OPENBSD);
if ((conf = calloc(1, sizeof(*conf))) == NULL) {
log_warn("%s", __func__);
return (NULL);
}
conf->sc_system.sys_services = -1;
conf->sc_flags = flags;
conf->sc_oidfmt =
flags & SNMPD_F_NONAMES ? MIB_OIDNUMERIC : MIB_OIDSYMBOLIC;
conf->sc_confpath = filename;
TAILQ_INIT(&conf->sc_addresses);
TAILQ_INIT(&conf->sc_agentx_masters);
TAILQ_INIT(&conf->sc_trapreceivers);
conf->sc_min_seclevel = SNMP_MSGFLAG_AUTH | SNMP_MSGFLAG_PRIV;
if ((file = pushfile(filename, 0)) == NULL) {
free(conf);
return (NULL);
}
topfile = file;
setservent(1);
yyparse();
errors = file->errors;
popfile();
endservent();
if (errors) {
free(conf);
return (NULL);
}
if (!mibparsed)
mib_parsedir("/usr/share/snmp/mibs");
mib_resolve();
if (resolve_oids() == -1) {
free(conf);
return NULL;
}
if (uname(&u) == -1)
fatal("uname");
if (conf->sc_system.sys_descr[0] == '\0')
snprintf(conf->sc_system.sys_descr,
sizeof(conf->sc_system.sys_descr), "%s %s %s %s %s",
u.sysname, u.nodename, u.release, u.version, u.machine);
if (conf->sc_system.sys_oid.bo_n == 0)
conf->sc_system.sys_oid = OID(MIB_SYSOID_DEFAULT);
if (conf->sc_system.sys_contact[0] == '\0')
snprintf(conf->sc_system.sys_contact,
sizeof(conf->sc_system.sys_contact), "root@%s", u.nodename);
if (conf->sc_system.sys_name[0] == '\0')
snprintf(conf->sc_system.sys_name,
sizeof(conf->sc_system.sys_name), "%s", u.nodename);
if (conf->sc_system.sys_services == -1)
conf->sc_system.sys_services = 0;
/* Must be identical to enginefmt_local:HOSTHASH */
if (conf->sc_engineid_len == 0) {
if (gethostname(hostname, sizeof(hostname)) == -1)
fatal("gethostname");
memcpy(conf->sc_engineid, &npen, sizeof(npen));
conf->sc_engineid_len += sizeof(npen);
conf->sc_engineid[conf->sc_engineid_len++] |=
SNMP_ENGINEID_FMT_HH;
memcpy(conf->sc_engineid + conf->sc_engineid_len,
SHA256(hostname, strlen(hostname), NULL),
sizeof(conf->sc_engineid) - conf->sc_engineid_len);
conf->sc_engineid_len = sizeof(conf->sc_engineid);
conf->sc_engineid[0] |= SNMP_ENGINEID_NEW;
}
/* Setup default listen addresses */
if (TAILQ_EMPTY(&conf->sc_addresses)) {
if (host("0.0.0.0", SNMP_PORT, AF_INET, SOCK_DGRAM,
&ss, 1) != 1)
fatal("Unexpected resolving of 0.0.0.0");
if (listen_add(&ss, SOCK_DGRAM, 0) == -1)
fatal("calloc");
if (host("::", SNMP_PORT, AF_INET6, SOCK_DGRAM, &ss, 1) != 1)
fatal("Unexpected resolving of ::");
if (listen_add(&ss, SOCK_DGRAM, 0) == -1)
fatal("calloc");
}
if ((up = usm_check_mincred(conf->sc_min_seclevel, &errstr)) != NULL)
fatalx("user '%s': %s", up->uu_name, errstr);
found = 0;
TAILQ_FOREACH(h, &conf->sc_addresses, entry) {
if (h->flags & ADDRESS_FLAG_NOTIFY)
found = 1;
}
if (ntrapcmds && !found) {
log_warnx("trap handler needs at least one notify listener");
free(conf);
return (NULL);
}
if (!ntrapcmds && found) {
log_warnx("notify listener needs at least one trap handler");
free(conf);
return (NULL);
}
TAILQ_FOREACH(tr, &conf->sc_trapreceivers, entry) {
if (tr->ta_version == SNMP_V2 &&
tr->ta_community[0] == '\0' &&
conf->sc_trcommunity[0] == '\0') {
log_warnx("trap receiver: missing community");
free(conf);
return (NULL);
}
if (tr->ta_version == SNMP_V3) {
tr->ta_usmuser = usm_finduser(tr->ta_usmusername);
if (tr->ta_usmuser == NULL) {
log_warnx("trap receiver: user not defined: %s",
tr->ta_usmusername);
free(conf);
return (NULL);
}
}
}
/* Free macros and check which have not been used. */
TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
if ((conf->sc_flags & SNMPD_F_VERBOSE) && !sym->used)
fprintf(stderr, "warning: macro '%s' not "
"used\n", sym->nam);
if (!sym->persist) {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entry);
free(sym);
}
}
return (conf);
}
int
symset(const char *nam, const char *val, int persist)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entry) {
if (strcmp(nam, sym->nam) == 0)
break;
}
if (sym != NULL) {
if (sym->persist == 1)
return (0);
else {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entry);
free(sym);
}
}
if ((sym = calloc(1, sizeof(*sym))) == NULL)
return (-1);
sym->nam = strdup(nam);
if (sym->nam == NULL) {
free(sym);
return (-1);
}
sym->val = strdup(val);
if (sym->val == NULL) {
free(sym->nam);
free(sym);
return (-1);
}
sym->used = 0;
sym->persist = persist;
TAILQ_INSERT_TAIL(&symhead, sym, entry);
return (0);
}
int
cmdline_symset(char *s)
{
char *sym, *val;
int ret;
if ((val = strrchr(s, '=')) == NULL)
return (-1);
sym = strndup(s, val - s);
if (sym == NULL)
errx(1, "%s: strndup", __func__);
ret = symset(sym, val + 1, 1);
free(sym);
return (ret);
}
char *
symget(const char *nam)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entry) {
if (strcmp(nam, sym->nam) == 0) {
sym->used = 1;
return (sym->val);
}
}
return (NULL);
}
int
host(const char *s, const char *port, int family, int type,
struct sockaddr_storage *ss, int max)
{
struct addrinfo hints, *res0, *res;
int error, i;
bzero(&hints, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = type;
/*
* Without AI_NUMERICHOST getaddrinfo might not resolve ip addresses
* for families not specified in the "family" statement in resolv.conf.
*/
hints.ai_flags = AI_NUMERICHOST;
error = getaddrinfo(s, port, &hints, &res0);
if (error == EAI_NONAME) {
hints.ai_flags = 0;
error = getaddrinfo(s, port, &hints, &res0);
}
if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
return 0;
if (error) {
log_warnx("Could not parse \"%s\": %s", s, gai_strerror(error));
return -1;
}
for (i = 0, res = res0; res; res = res->ai_next, i++) {
if (res->ai_family != AF_INET &&
res->ai_family != AF_INET6)
continue;
if (i >= max)
continue;
bcopy(res->ai_addr, &(ss[i]), res->ai_addrlen);
}
freeaddrinfo(res0);
return i;
}
int
listen_add(struct sockaddr_storage *ss, int type, int flags)
{
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
struct address *h;
if ((h = calloc(1, sizeof(*h))) == NULL)
return -1;
bcopy(ss, &(h->ss), sizeof(*ss));
if (ss->ss_family == AF_INET) {
sin = (struct sockaddr_in *)ss;
h->port = ntohs(sin->sin_port);
} else {
sin6 = (struct sockaddr_in6*)ss;
h->port = ntohs(sin6->sin6_port);
}
h->type = type;
if (((h->flags = flags) & ADDRESS_FLAG_PERM) == 0) {
if (h->port == 162)
h->flags |= ADDRESS_FLAG_NOTIFY;
else
h->flags |= ADDRESS_FLAG_READ | ADDRESS_FLAG_WRITE;
}
if ((h->flags & ADDRESS_FLAG_MPS) == 0)
h->flags |= ADDRESS_FLAG_SNMPV3;
TAILQ_INSERT_TAIL(&(conf->sc_addresses), h, entry);
return 0;
}
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