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/*
* lbcd client-server routines.
*
* Obtains and sends polling information. Also acts as a test driver.
*
* Written by Larry Schwimmer
* Copyright 1996, 1997, 1998, 2004, 2006, 2012, 2013
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/socket.h>
#include <portable/system.h>
#include <time.h>
#include <server/internal.h>
#include <util/vector.h>
/*
* Set the waits and increments in the response.
*/
static void
lbcd_set_load(struct lbcd_reply *lb, struct vector *services)
{
int i, numserv;
/* Clear pad and set number of requested services */
lb->pad = 0;
lb->services = numserv = services->count;
/* Set default weight. */
lbcd_setweight(lb, 0, "default");
/* If the sentinel file exists, override the weight and set it to max. */
if (access(LBCD_SENTINEL_FILE, F_OK) == 0)
lb->weights[0].host_weight = (uint32_t) -1;
/* Convert to network byte order. */
lb->weights[0].host_weight = htonl(lb->weights[0].host_weight);
lb->weights[0].host_incr = htonl(lb->weights[0].host_incr);
/* Set requested services, if any */
for (i = 1; i <= numserv; i++) {
lbcd_setweight(lb, i, services->strings[i - 1]);
lb->weights[i].host_weight = htonl(lb->weights[i].host_weight);
lb->weights[i].host_incr = htonl(lb->weights[i].host_incr);
}
}
/*
* Convert a protocol 3 packet to a form a protocol 2 server will use
* properly.
*
* Version 2 of the protocol had no mechanism for client-computed load. To
* work around this problem, we just lie to the version 2 server such that the
* weight lbnamed will compute will be the weight we desire. Note that we
* have no control over the increment for version 2 lbnamed -- that value is
* hard-coded.
*/
static void
lbcd_proto2_convert(struct lbcd_reply *lb)
{
uint32_t weightval_i;
uint16_t weightval_s;
/* Convert host weight to a short, handling network byte order */
weightval_i = ntohl(lb->weights[0].host_weight);
if (weightval_i > (uint16_t) -1)
weightval_s = (uint16_t) -1;
else
weightval_s = weightval_i;
/*
* lbnamed v2 only used l1, tot_users, and uniq_users, although Rob thinks
* all the loads may be used, so set them all just in case.
*/
lb->l1 = htons(weightval_s);
lb->l5 = htons(weightval_s);
lb->l15 = htons(weightval_s);
lb->tot_users = 0;
lb->uniq_users = 0;
}
/*
* Obtain all of our response information and store it in the response struct.
*/
void
lbcd_pack_info(struct lbcd_reply *lb, unsigned int protocol,
struct vector *services, int simple)
{
double l1, l5, l15;
time_t bt, ct;
int tu, uu, oc;
time_t umtime;
/* Timestamps. */
kernel_getboottime(&bt);
lb->boot_time = htonl(bt);
time(&ct);
lb->current_time = htonl(ct);
/* Load. */
kernel_getload(&l1,&l5,&l15);
lb->l1 = htons((uint16_t) (l1 * 100));
lb->l5 = htons((uint16_t) (l5 * 100));
lb->l15 = htons((uint16_t) (l15 * 100));
/* Users. */
get_user_stats(&tu,&uu,&oc,&umtime);
lb->tot_users = htons(tu);
lb->uniq_users = htons(uu);
lb->on_console = oc;
lb->user_mtime = htonl(umtime);
/* Additional fields. */
lb->reserved = 0;
lb->tmp_full = tmp_full("/tmp");
#ifdef P_tmpdir
lb->tmpdir_full = tmp_full(P_tmpdir);
#else
lb->tmpdir_full = lb->tmp_full;
#endif
/* Weights and increments. */
lbcd_set_load(lb, services);
/* Backward compatibility. */
if (!simple && protocol < 3)
lbcd_proto2_convert(lb);
}
/*
* Test lbcd by looking for the same data that we would return over the
* network but print it to standard output instead. Takes the non-option
* arguments, which are taken to be a list of services whose weight modules
* should be run. The special module "v2" means to do protocol version 2
* instead of 3 (the default).
*/
void
lbcd_test(int argc, char *argv[])
{
struct lbcd_reply lb;
struct lbcd_request ph;
struct vector *services;
int i;
/* Create query packet. */
lb.h.version = ph.h.version = LBCD_VERSION;
lb.h.id = ph.h.id = 0;
lb.h.op = ph.h.op = LBCD_OP_LBINFO;
lb.h.status = ph.h.status = 0;
/* Handle version 2 option. */
if (argv[0] && strcmp(argv[0],"v2") == 0) {
argc--;
argv++;
lb.h.version = ph.h.version = 2;
}
/* Fill in service requests. */
services = vector_new();
if (argc > 0 && lb.h.version == 3) {
ph.h.status = argc > LBCD_MAX_SERVICES ? LBCD_MAX_SERVICES : argc;
for (i = 0; i < argc; i++) {
if (i >= LBCD_MAX_SERVICES)
break;
if (argv[i] == NULL)
break;
vector_add(services, argv[i]);
}
}
/* Fill reply. */
lbcd_pack_info(&lb, lb.h.version, services, 0);
/* Print results. */
printf("PROTOCOL %u\n", (unsigned int) lb.h.version);
printf("\n");
printf("MACHINE STATUS:\n");
printf("l1 = %u\n", (unsigned int) ntohs(lb.l1));
printf("l5 = %u\n", (unsigned int) ntohs(lb.l5));
printf("l15 = %u\n", (unsigned int) ntohs(lb.l15));
printf("current_time = %lu\n", (unsigned long) ntohl(lb.current_time));
printf("boot_time = %lu\n", (unsigned long) ntohl(lb.boot_time));
printf("user_mtime = %lu\n", (unsigned long) ntohl(lb.user_mtime));
printf("tot_users = %u\n", (unsigned int) ntohs(lb.tot_users));
printf("uniq_users = %u\n", (unsigned int) ntohs(lb.uniq_users));
printf("on_console = %u\n", (unsigned int) lb.on_console);
printf("tmp_full = %u\n", (unsigned int) lb.tmp_full);
printf("tmpdir_full = %u\n", (unsigned int) lb.tmpdir_full);
printf("\n");
printf("SERVICES: %u\n", (unsigned int) lb.services);
for (i = 0; i <= lb.services; i++)
printf("%d: weight %10lu increment %10lu name %s\n", i,
(unsigned long) ntohl(lb.weights[i].host_weight),
(unsigned long) ntohl(lb.weights[i].host_incr),
i ? ph.names[i - 1] : "default");
vector_free(services);
exit(0);
}
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