wn/openbsd_snmpd_ntpd
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

initial

Browse Source
This commit is contained in:
Wolfgang Hottgenroth 2025-02-14 17:39:57 +01:00
commit f160c0f4e3
8 changed files with 1144 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Makefile Normal file
View File

@ -0,0 +1,15 @@
PROG= snmpd_ntpd
SRCS= mib.c log.c timer.c util.c
MAN=
CFLAGS+= -Wall -I${.CURDIR}
CFLAGS+= -Wstrict-prototypes -Wmissing-prototypes
CFLAGS+= -Wmissing-declarations
CFLAGS+= -Wshadow -Wpointer-arith -Wcast-qual
CFLAGS+= -Wsign-compare
LDADD= -lagentx -levent -lkvm
DPADD= ${LIBAGENTX} ${LIBEVENT} ${LIBKVM}
BINDIR= /usr/libexec/snmpd/
.include <bsd.prog.mk>

218
log.c Normal file
View File

@ -0,0 +1,218 @@
/* $OpenBSD: log.c,v 1.1.1.1 2022/09/01 14:20:34 martijn Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* 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 <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <time.h>
static int debug;
static int verbose;
const char *log_procname;
void log_init(int, int);
void log_procinit(const char *);
void log_setverbose(int);
int log_getverbose(void);
void log_warn(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_warnx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_info(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_debug(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void logit(int, const char *, ...)
__attribute__((__format__ (printf, 2, 3)));
void vlog(int, const char *, va_list)
__attribute__((__format__ (printf, 2, 0)));
__dead void fatal(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
__dead void fatalx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void
log_init(int n_debug, int facility)
{
extern char *__progname;
debug = n_debug;
verbose = n_debug;
log_procinit(__progname);
if (!debug)
openlog(__progname, LOG_PID | LOG_NDELAY, facility);
tzset();
}
void
log_procinit(const char *procname)
{
if (procname != NULL)
log_procname = procname;
}
void
log_setverbose(int v)
{
verbose = v;
}
int
log_getverbose(void)
{
return (verbose);
}
void
logit(int pri, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vlog(pri, fmt, ap);
va_end(ap);
}
void
vlog(int pri, const char *fmt, va_list ap)
{
char *nfmt;
int saved_errno = errno;
if (debug) {
/* best effort in out of mem situations */
if (asprintf(&nfmt, "%s\n", fmt) == -1) {
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
} else {
vfprintf(stderr, nfmt, ap);
free(nfmt);
}
fflush(stderr);
} else
vsyslog(pri, fmt, ap);
errno = saved_errno;
}
void
log_warn(const char *emsg, ...)
{
char *nfmt;
va_list ap;
int saved_errno = errno;
/* best effort to even work in out of memory situations */
if (emsg == NULL)
logit(LOG_ERR, "%s", strerror(saved_errno));
else {
va_start(ap, emsg);
if (asprintf(&nfmt, "%s: %s", emsg,
strerror(saved_errno)) == -1) {
/* we tried it... */
vlog(LOG_ERR, emsg, ap);
logit(LOG_ERR, "%s", strerror(saved_errno));
} else {
vlog(LOG_ERR, nfmt, ap);
free(nfmt);
}
va_end(ap);
}
errno = saved_errno;
}
void
log_warnx(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vlog(LOG_ERR, emsg, ap);
va_end(ap);
}
void
log_info(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vlog(LOG_INFO, emsg, ap);
va_end(ap);
}
void
log_debug(const char *emsg, ...)
{
va_list ap;
if (verbose > 1) {
va_start(ap, emsg);
vlog(LOG_DEBUG, emsg, ap);
va_end(ap);
}
}
static void
vfatalc(int code, const char *emsg, va_list ap)
{
static char s[BUFSIZ];
const char *sep;
if (emsg != NULL) {
(void)vsnprintf(s, sizeof(s), emsg, ap);
sep = ": ";
} else {
s[0] = '\0';
sep = "";
}
if (code)
logit(LOG_CRIT, "%s: %s%s%s",
log_procname, s, sep, strerror(code));
else
logit(LOG_CRIT, "%s%s%s", log_procname, sep, s);
}
void
fatal(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vfatalc(errno, emsg, ap);
va_end(ap);
exit(1);
}
void
fatalx(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vfatalc(0, emsg, ap);
va_end(ap);
exit(1);
}

40
log.h Normal file
View File

@ -0,0 +1,40 @@
/* $OpenBSD: log.h,v 1.1.1.1 2022/09/01 14:20:34 martijn Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* 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 <stdarg.h>
void log_init(int, int);
void log_procinit(const char *);
void log_setverbose(int);
int log_getverbose(void);
void log_warn(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_warnx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_info(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_debug(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void logit(int, const char *, ...)
__attribute__((__format__ (printf, 2, 3)));
void vlog(int, const char *, va_list)
__attribute__((__format__ (printf, 2, 0)));
__dead void fatal(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
__dead void fatalx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));

327
mib.c Normal file
View File

@ -0,0 +1,327 @@
/* $OpenBSD: mib.c,v 1.9 2024/05/22 08:44:02 martijn Exp $ */
/*
* Copyright (c) 2022 Martijn van Duren <martijn@openbsd.org>
* Copyright (c) 2012 Joel Knight <joel@openbsd.org>
* Copyright (c) 2007, 2008, 2012 Reyk Floeter <reyk@openbsd.org>
*
* 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/types.h>
#include <sys/signal.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/tree.h>
#include <sys/utsname.h>
#include <sys/sysctl.h>
#include <sys/sensors.h>
#include <sys/sched.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#include <sys/disk.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_carp.h>
#include <netinet/ip_var.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/pfvar.h>
#include <netinet/ip_ipsp.h>
#include <net/if_pfsync.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <libgen.h>
#include <limits.h>
#include <kvm.h>
#include "log.h"
#include "snmpd.h"
#include "mib.h"
struct event connev;
const char *agentxsocket = NULL;
int agentxfd = -1;
int pageshift;
#define pagetok(size) ((size) << pageshift)
void pageshift_init(void);
void snmp_connect(struct agentx *, void *, int);
void snmp_tryconnect(int, short, void *);
void snmp_read(int, short, void *);
struct agentx_context *sac;
struct snmpd *snmpd_env;
void mib_hrsystemuptime(struct agentx_varbind *);
void mib_hottisntpdcounter(struct agentx_varbind *);
void
mib_hrsystemuptime(struct agentx_varbind *vb)
{
struct timespec uptime;
long long ticks;
if (clock_gettime(CLOCK_BOOTTIME, &uptime) == -1) {
log_warn("clock_gettime");
agentx_varbind_error(vb);
return;
}
ticks = uptime.tv_sec * 100 + uptime.tv_nsec / 10000000;
agentx_varbind_timeticks(vb, ticks);
}
void
mib_hottisntpdcounter(struct agentx_varbind *vb)
{
long long ticks = 200169;
agentx_varbind_counter64(vb, ticks);
}
int
main(int argc, char *argv[])
{
static struct snmpd conf;
struct agentx *sa;
struct agentx_session *sas;
struct passwd *pw;
struct group *gr;
char agentxsocketdir[PATH_MAX];
int ch;
int verbose = 0, daemonize = 1, debug = 0;
char *context = NULL;
const char *errstr;
/* HOST-RESOURCES-MIB */
struct agentx_region *host;
struct agentx_object *hrSystemUptime;
struct agentx_region *hottis;
struct agentx_object *hottisNtpdCounter;
snmpd_env = &conf;
log_init(2, LOG_DAEMON);
agentx_log_fatal = fatalx;
agentx_log_warn = log_warnx;
agentx_log_info = log_info;
agentx_log_debug = log_debug;
while ((ch = getopt(argc, argv, "C:c:ds:vx:")) != -1) {
switch (ch) {
case 'C':
if (strcmp(optarg, "filter-routes") == 0) {
conf.sc_rtfilter = ROUTE_FILTER(RTM_NEWADDR) |
ROUTE_FILTER(RTM_DELADDR) |
ROUTE_FILTER(RTM_IFINFO) |
ROUTE_FILTER(RTM_IFANNOUNCE);
}
break;
case 'c':
context = optarg;
break;
case 'd':
daemonize = 0;
debug = 1;
break;
case 's':
if (optarg[0] != '/')
fatalx("agentx socket path must be absolute");
agentxsocket = optarg;
break;
case 'v':
verbose++;
break;
case 'x':
/* Undocumented flag for snmpd(8) spawning */
agentxfd = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
fatalx("invalid agentx fd: %s", errstr);
daemonize = 0;
break;
default:
fatalx("usage: snmpd_metrics [-dv] [-C option] "
"[-c context] [-s master]\n");
}
}
if (agentxfd != -1 && !debug)
/* Initialize syslog logging asap for snmpd */
log_init(0, LOG_DAEMON);
if ((pw = getpwnam("_snmpd")) == NULL)
fatal("can't find _snmpd user");
if ((gr = getgrnam("_agentx")) == NULL)
fatal("can't find _agentx group");
if (agentxfd != -1 && agentxsocket != NULL)
fatalx("-s and -x are mutually exclusive");
if (agentxfd == -1 && agentxsocket == NULL)
agentxsocket = AGENTX_MASTER_PATH;
event_init();
if ((sa = agentx(snmp_connect, NULL)) == NULL)
fatal("agentx");
if ((sas = agentx_session(sa, NULL, 0, "OpenSNMPd metrics", 0)) == NULL)
fatal("agentx_session");
if ((sac = agentx_context(sas, context)) == NULL)
fatal("agentx_context");
/* kr_init requires sac */
pageshift_init();
if (agentxsocket != NULL) {
if (strlcpy(agentxsocketdir, agentxsocket,
sizeof(agentxsocketdir)) >= sizeof(agentxsocketdir)) {
errno = ENAMETOOLONG;
fatal("-s");
}
if (unveil(dirname(agentxsocketdir), "r") == -1)
fatal("unveil");
}
/* Can't pledge: kvm_getfiles */
if (unveil(NULL, NULL) == -1)
fatal("unveil");
if (setgid(gr->gr_gid) == -1)
fatal("setgid");
if (setuid(pw->pw_uid) == -1)
fatal("setuid");
/* HOST-RESOURCES-MIB */
if ((host = agentx_region(sac, AGENTX_OID(HOST), 0)) == NULL)
fatal("agentx_region");
if ((hrSystemUptime = agentx_object(host, AGENTX_OID(HRSYSTEMUPTIME),
NULL, 0, 0, mib_hrsystemuptime)) == NULL)
fatal("agentx_object");
if ((hottis = agentx_region(sac, AGENTX_OID(HOTTIS_MIB), 0)) == NULL)
fatal("agentx_region");
if ((hottisNtpdCounter = agentx_object(hottis, AGENTX_OID(HOTTIS_NTPD_COUNTER),
NULL, 0, 0, mib_hottisntpdcounter)) == NULL)
fatal("agentx_object");
if (daemonize) {
log_init(0, LOG_DAEMON);
daemon(0, 0);
}
log_setverbose(verbose);
event_dispatch();
}
#define LOG1024 10
void
pageshift_init(void)
{
long pagesize;
if ((pagesize = sysconf(_SC_PAGESIZE)) == -1)
fatal("sysconf(_SC_PAGESIZE)");
while (pagesize > 1) {
pageshift++;
pagesize >>= 1;
}
/* we only need the amount of log(2)1024 for our conversion */
pageshift -= LOG1024;
}
void
snmp_connect(struct agentx *sa, void *cookie, int close)
{
static int init = 0;
if (close) {
event_del(&connev);
return;
}
if (agentxfd != -1) {
/* Exit if snmpd(8) leaves */
if (init)
exit(0);
agentx_connect(sa, agentxfd);
event_set(&connev, agentxfd, EV_READ | EV_PERSIST,
snmp_read, sa);
event_add(&connev, NULL);
init = 1;
} else
snmp_tryconnect(-1, 0, sa);
}
void
snmp_tryconnect(int fd, short event, void *cookie)
{
struct timeval timeout = {3, 0};
struct agentx *sa = cookie;
struct sockaddr_un sun;
sun.sun_len = sizeof(sun);
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, AGENTX_MASTER_PATH, sizeof(sun.sun_path));
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1 ||
connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
if (fd != -1)
close(fd);
log_warn("Failed to connect to snmpd");
evtimer_set(&connev, snmp_tryconnect, sa);
evtimer_add(&connev, &timeout);
return;
}
event_set(&connev, fd, EV_READ | EV_PERSIST, snmp_read, sa);
event_add(&connev, NULL);
agentx_connect(sa, fd);
}
void
snmp_read(int fd, short event, void *cookie)
{
struct agentx *sa = cookie;
agentx_read(sa);
}
u_long
smi_getticks(void)
{
return agentx_context_uptime(sac);
}

27
mib.h Normal file
View File

@ -0,0 +1,27 @@
/* $OpenBSD: mib.h,v 1.1.1.1 2022/09/01 14:20:34 martijn Exp $ */
/*
* Copyright (c) 2022 Martijn van Duren <martijn@openbsd.org>
*
* 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 <agentx.h>
#define HOST AGENTX_MIB2, 253
#define HRSYSTEM HOST, 1
#define HRSYSTEMUPTIME HRSYSTEM, 1
#define HOTTIS_MIB 1,3,6,1,4,1,9676
#define HOTTIS_NTPD HOTTIS_MIB, 1
#define HOTTIS_NTPD_COUNTER HOTTIS_NTPD, 1

119
snmpd.h Normal file
View File

@ -0,0 +1,119 @@
/* $OpenBSD: snmpd.h,v 1.1.1.1 2022/09/01 14:20:33 martijn Exp $ */
/*
* Copyright (c) 2007, 2008, 2012 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* 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.
*/
#ifndef SNMPD_H
#define SNMPD_H
#include <sys/tree.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <net/pfvar.h>
#include <net/route.h>
#include <ber.h>
#include <stdio.h>
#include <imsg.h>
#include "log.h"
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
/*
* common definitions for snmpd
*/
#define CONF_FILE "/etc/snmpd.conf"
#define SNMPD_SOCKET "/var/run/snmpd.sock"
#define SNMPD_USER "_snmpd"
#define SNMP_PORT "161"
#define SNMPTRAP_PORT "162"
#define SNMPD_MAXSTRLEN 484
#define SNMPD_MAXCOMMUNITYLEN SNMPD_MAXSTRLEN
#define SNMPD_MAXVARBIND 0x7fffffff
#define SNMPD_MAXVARBINDLEN 1210
#define SNMPD_MAXENGINEIDLEN 32
#define SNMPD_MAXUSERNAMELEN 32
#define SNMPD_MAXCONTEXNAMELEN 32
#define SNMP_USM_MAXDIGESTLEN 48
#define SNMP_USM_SALTLEN 8
#define SNMP_USM_KEYLEN 64
#define SNMP_CIPHER_KEYLEN 16
#define SMALL_READ_BUF_SIZE 1024
#define READ_BUF_SIZE 65535
#define RT_BUF_SIZE 16384
#define MAX_RTSOCK_BUF (2 * 1024 * 1024)
#define SNMP_ENGINEID_OLD 0x00
#define SNMP_ENGINEID_NEW 0x80 /* RFC3411 */
#define SNMP_ENGINEID_FMT_IPv4 1
#define SNMP_ENGINEID_FMT_IPv6 2
#define SNMP_ENGINEID_FMT_MAC 3
#define SNMP_ENGINEID_FMT_TEXT 4
#define SNMP_ENGINEID_FMT_OCT 5
#define SNMP_ENGINEID_FMT_HH 129
#define PEN_OPENBSD 30155
#if DEBUG
#define DPRINTF log_debug
#else
#define DPRINTF(x...) do {} while(0)
#endif
/*
* daemon structures
*/
struct snmpd {
int sc_ncpu;
int64_t *sc_cpustates;
int sc_rtfilter;
};
extern struct snmpd *snmpd_env;
/* mib.c */
u_long smi_getticks(void);
/* timer.c */
void timer_init(void);
/* util.c */
ssize_t sendtofrom(int, void *, size_t, int, struct sockaddr *,
socklen_t, struct sockaddr *, socklen_t);
ssize_t recvfromto(int, void *, size_t, int, struct sockaddr *,
socklen_t *, struct sockaddr *, socklen_t *);
const char *log_in6addr(const struct in6_addr *);
const char *print_host(struct sockaddr_storage *, char *, size_t);
char *tohexstr(u_int8_t *, int);
uint8_t *fromhexstr(uint8_t *, const char *, size_t);
#endif /* SNMPD_H */

169
timer.c Normal file
View File

@ -0,0 +1,169 @@
/* $OpenBSD: timer.c,v 1.1.1.1 2022/09/01 14:20:33 martijn Exp $ */
/*
* Copyright (c) 2008 Reyk Floeter <reyk@openbsd.org>
*
* 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/queue.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/sched.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include "snmpd.h"
#include "mib.h"
void timer_cpu(int, short, void *);
int percentages(int, int64_t *, int64_t *, int64_t *, int64_t *);
static int64_t **cp_time;
static int64_t **cp_old;
static int64_t **cp_diff;
struct event cpu_ev;
void
timer_cpu(int fd, short event, void *arg)
{
struct event *ev = (struct event *)arg;
struct timeval tv = { 60, 0 }; /* every 60 seconds */
int mib[3] = { CTL_KERN, KERN_CPTIME2, 0 }, n;
size_t len;
int64_t *cptime2;
len = CPUSTATES * sizeof(int64_t);
for (n = 0; n < snmpd_env->sc_ncpu; n++) {
mib[2] = n;
cptime2 = snmpd_env->sc_cpustates + (CPUSTATES * n);
if (sysctl(mib, 3, cp_time[n], &len, NULL, 0) == -1)
continue;
(void)percentages(CPUSTATES, cptime2, cp_time[n],
cp_old[n], cp_diff[n]);
#ifdef DEBUG
log_debug("timer_cpu: cpu%d %lld%% idle in %llds", n,
(cptime2[CP_IDLE] > 1000 ?
1000 : (cptime2[CP_IDLE] / 10)), (long long) tv.tv_sec);
#endif
}
evtimer_add(ev, &tv);
}
void
timer_init(void)
{
int mib[] = { CTL_HW, HW_NCPU }, i;
size_t len;
len = sizeof(snmpd_env->sc_ncpu);
if (sysctl(mib, 2, &snmpd_env->sc_ncpu, &len, NULL, 0) == -1)
fatal("sysctl");
snmpd_env->sc_cpustates = calloc(snmpd_env->sc_ncpu,
CPUSTATES * sizeof(int64_t));
cp_time = calloc(snmpd_env->sc_ncpu, sizeof(int64_t *));
cp_old = calloc(snmpd_env->sc_ncpu, sizeof(int64_t *));
cp_diff = calloc(snmpd_env->sc_ncpu, sizeof(int64_t *));
if (snmpd_env->sc_cpustates == NULL ||
cp_time == NULL || cp_old == NULL || cp_diff == NULL)
fatal("calloc");
for (i = 0; i < snmpd_env->sc_ncpu; i++) {
cp_time[i] = calloc(CPUSTATES, sizeof(int64_t));
cp_old[i] = calloc(CPUSTATES, sizeof(int64_t));
cp_diff[i] = calloc(CPUSTATES, sizeof(int64_t));
if (cp_time[i] == NULL || cp_old[i] == NULL ||
cp_diff[i] == NULL)
fatal("calloc");
}
evtimer_set(&cpu_ev, timer_cpu, &cpu_ev);
timer_cpu(0, EV_TIMEOUT, &cpu_ev);
}
/*
* percentages() function to calculate CPU utilization.
* Source code derived from the top(1) utility:
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*
* 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 AUTHOR ``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 AUTHOR OR HIS EMPLOYER 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.
*/
int
percentages(int cnt, int64_t *out, int64_t *new, int64_t *old, int64_t *diffs)
{
int64_t change, total_change, *dp, half_total;
int i;
/* initialization */
total_change = 0;
dp = diffs;
/* calculate changes for each state and the overall change */
for (i = 0; i < cnt; i++) {
if ((change = *new - *old) < 0) {
/* this only happens when the counter wraps */
change = (*new - *old);
}
total_change += (*dp++ = change);
*old++ = *new++;
}
/* avoid divide by zero potential */
if (total_change == 0)
total_change = 1;
/* calculate percentages based on overall change, rounding up */
half_total = total_change / 2l;
for (i = 0; i < cnt; i++)
*out++ = ((*diffs++ * 1000 + half_total) / total_change);
/* return the total in case the caller wants to use it */
return (total_change);
}

229
util.c Normal file
View File

@ -0,0 +1,229 @@
/* $OpenBSD: util.c,v 1.1.1.1 2022/09/01 14:20:33 martijn Exp $ */
/*
* Copyright (c) 2014 Bret Stephen Lambert <blambert@openbsd.org>
*
* 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/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <ber.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <event.h>
#include "snmpd.h"
ssize_t
sendtofrom(int s, void *buf, size_t len, int flags, struct sockaddr *to,
socklen_t tolen, struct sockaddr *from, socklen_t fromlen)
{
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct in6_pktinfo *pkt6;
struct sockaddr_in *in;
struct sockaddr_in6 *in6;
union {
struct cmsghdr hdr;
char inbuf[CMSG_SPACE(sizeof(struct in_addr))];
char in6buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
} cmsgbuf;
bzero(&msg, sizeof(msg));
bzero(&cmsgbuf, sizeof(cmsgbuf));
iov.iov_base = buf;
iov.iov_len = len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_name = to;
msg.msg_namelen = tolen;
msg.msg_control = &cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf);
cmsg = CMSG_FIRSTHDR(&msg);
switch (to->sa_family) {
case AF_INET:
msg.msg_controllen = sizeof(cmsgbuf.inbuf);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
cmsg->cmsg_level = IPPROTO_IP;
cmsg->cmsg_type = IP_SENDSRCADDR;
in = (struct sockaddr_in *)from;
memcpy(CMSG_DATA(cmsg), &in->sin_addr, sizeof(struct in_addr));
break;
case AF_INET6:
msg.msg_controllen = sizeof(cmsgbuf.in6buf);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
in6 = (struct sockaddr_in6 *)from;
pkt6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
pkt6->ipi6_addr = in6->sin6_addr;
break;
}
return sendmsg(s, &msg, flags);
}
ssize_t
recvfromto(int s, void *buf, size_t len, int flags, struct sockaddr *from,
socklen_t *fromlen, struct sockaddr *to, socklen_t *tolen)
{
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct in6_pktinfo *pkt6;
struct sockaddr_in *in;
struct sockaddr_in6 *in6;
ssize_t ret;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(struct sockaddr_storage))];
} cmsgbuf;
bzero(&msg, sizeof(msg));
bzero(&cmsgbuf.buf, sizeof(cmsgbuf.buf));
iov.iov_base = buf;
iov.iov_len = len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_name = from;
msg.msg_namelen = *fromlen;
msg.msg_control = &cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
if ((ret = recvmsg(s, &msg, flags)) == -1)
return (-1);
*fromlen = from->sa_len;
*tolen = 0;
if (getsockname(s, to, tolen) != 0)
*tolen = 0;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
switch (from->sa_family) {
case AF_INET:
if (cmsg->cmsg_level == IPPROTO_IP &&
cmsg->cmsg_type == IP_RECVDSTADDR) {
in = (struct sockaddr_in *)to;
in->sin_family = AF_INET;
in->sin_len = *tolen = sizeof(*in);
memcpy(&in->sin_addr, CMSG_DATA(cmsg),
sizeof(struct in_addr));
}
break;
case AF_INET6:
if (cmsg->cmsg_level == IPPROTO_IPV6 &&
cmsg->cmsg_type == IPV6_PKTINFO) {
in6 = (struct sockaddr_in6 *)to;
in6->sin6_family = AF_INET6;
in6->sin6_len = *tolen = sizeof(*in6);
pkt6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
memcpy(&in6->sin6_addr, &pkt6->ipi6_addr,
sizeof(struct in6_addr));
if (IN6_IS_ADDR_LINKLOCAL(&in6->sin6_addr))
in6->sin6_scope_id =
pkt6->ipi6_ifindex;
}
break;
}
}
return (ret);
}
const char *
log_in6addr(const struct in6_addr *addr)
{
static char buf[NI_MAXHOST];
struct sockaddr_in6 sa_in6;
u_int16_t tmp16;
bzero(&sa_in6, sizeof(sa_in6));
sa_in6.sin6_len = sizeof(sa_in6);
sa_in6.sin6_family = AF_INET6;
memcpy(&sa_in6.sin6_addr, addr, sizeof(sa_in6.sin6_addr));
/* XXX thanks, KAME, for this ugliness... adopted from route/show.c */
if (IN6_IS_ADDR_LINKLOCAL(&sa_in6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sa_in6.sin6_addr)) {
memcpy(&tmp16, &sa_in6.sin6_addr.s6_addr[2], sizeof(tmp16));
sa_in6.sin6_scope_id = ntohs(tmp16);
sa_in6.sin6_addr.s6_addr[2] = 0;
sa_in6.sin6_addr.s6_addr[3] = 0;
}
return (print_host((struct sockaddr_storage *)&sa_in6, buf,
NI_MAXHOST));
}
const char *
print_host(struct sockaddr_storage *ss, char *buf, size_t len)
{
if (getnameinfo((struct sockaddr *)ss, ss->ss_len,
buf, len, NULL, 0, NI_NUMERICHOST) != 0) {
buf[0] = '\0';
return (NULL);
}
return (buf);
}
char *
tohexstr(uint8_t *bstr, int len)
{
#define MAXHEXSTRLEN 256
static char hstr[2 * MAXHEXSTRLEN + 1];
static const char hex[] = "0123456789abcdef";
int i;
if (len > MAXHEXSTRLEN)
len = MAXHEXSTRLEN; /* truncate */
for (i = 0; i < len; i++) {
hstr[i + i] = hex[bstr[i] >> 4];
hstr[i + i + 1] = hex[bstr[i] & 0x0f];
}
hstr[i + i] = '\0';
return hstr;
}
uint8_t *
fromhexstr(uint8_t *bstr, const char *hstr, size_t len)
{
size_t i;
char hex[3];
if (len % 2 != 0)
return NULL;
hex[2] = '\0';
for (i = 0; i < len; i += 2) {
if (!isxdigit(hstr[i]) || !isxdigit(hstr[i + 1]))
return NULL;
hex[0] = hstr[i];
hex[1] = hstr[i + 1];
bstr[i / 2] = strtol(hex, NULL, 16);
}
return bstr;
}