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ipc.c
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ipc.c
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/*
* Copyright 2004-2019 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#if defined(US_AUTH_PEERCRED_UCRED) || defined(US_AUTH_PEERCRED_SOCKPEERCRED)
# ifdef US_AUTH_PEERCRED_UCRED
# ifndef _GNU_SOURCE
# define _GNU_SOURCE
# endif
# endif
# include <sys/socket.h>
#elif defined(US_AUTH_GETPEERUCRED)
# include <ucred.h>
#endif
#include <sys/param.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <grp.h>
#include <errno.h>
#include <fcntl.h>
#include <bzlib.h>
#include <crm/crm.h> /* indirectly: pcmk_err_generic */
#include <crm/msg_xml.h>
#include <crm/common/ipc.h>
#include <crm/common/ipcs.h>
#include <crm/common/ipc_internal.h> /* PCMK__SPECIAL_PID* */
#define PCMK_IPC_VERSION 1
/* Evict clients whose event queue grows this large (by default) */
#define PCMK_IPC_DEFAULT_QUEUE_MAX 500
struct crm_ipc_response_header {
struct qb_ipc_response_header qb;
uint32_t size_uncompressed;
uint32_t size_compressed;
uint32_t flags;
uint8_t version; /* Protect against version changes for anyone that might bother to statically link us */
};
static int hdr_offset = 0;
static unsigned int ipc_buffer_max = 0;
static unsigned int pick_ipc_buffer(unsigned int max);
static inline void
crm_ipc_init(void)
{
if (hdr_offset == 0) {
hdr_offset = sizeof(struct crm_ipc_response_header);
}
if (ipc_buffer_max == 0) {
ipc_buffer_max = pick_ipc_buffer(0);
}
}
unsigned int
crm_ipc_default_buffer_size(void)
{
return pick_ipc_buffer(0);
}
static char *
generateReference(const char *custom1, const char *custom2)
{
static uint ref_counter = 0;
const char *local_cust1 = custom1;
const char *local_cust2 = custom2;
int reference_len = 4;
char *since_epoch = NULL;
reference_len += 20; /* too big */
reference_len += 40; /* too big */
if (local_cust1 == NULL) {
local_cust1 = "_empty_";
}
reference_len += strlen(local_cust1);
if (local_cust2 == NULL) {
local_cust2 = "_empty_";
}
reference_len += strlen(local_cust2);
since_epoch = calloc(1, reference_len);
if (since_epoch != NULL) {
sprintf(since_epoch, "%s-%s-%lu-%u",
local_cust1, local_cust2, (unsigned long)time(NULL), ref_counter++);
}
return since_epoch;
}
xmlNode *
create_request_adv(const char *task, xmlNode * msg_data,
const char *host_to, const char *sys_to,
const char *sys_from, const char *uuid_from, const char *origin)
{
char *true_from = NULL;
xmlNode *request = NULL;
char *reference = generateReference(task, sys_from);
if (uuid_from != NULL) {
true_from = generate_hash_key(sys_from, uuid_from);
} else if (sys_from != NULL) {
true_from = strdup(sys_from);
} else {
crm_err("No sys from specified");
}
/* host_from will get set for us if necessary by CRMd when routed */
request = create_xml_node(NULL, __FUNCTION__);
crm_xml_add(request, F_CRM_ORIGIN, origin);
crm_xml_add(request, F_TYPE, T_CRM);
crm_xml_add(request, F_CRM_VERSION, CRM_FEATURE_SET);
crm_xml_add(request, F_CRM_MSG_TYPE, XML_ATTR_REQUEST);
crm_xml_add(request, F_CRM_REFERENCE, reference);
crm_xml_add(request, F_CRM_TASK, task);
crm_xml_add(request, F_CRM_SYS_TO, sys_to);
crm_xml_add(request, F_CRM_SYS_FROM, true_from);
/* HOSTTO will be ignored if it is to the DC anyway. */
if (host_to != NULL && strlen(host_to) > 0) {
crm_xml_add(request, F_CRM_HOST_TO, host_to);
}
if (msg_data != NULL) {
add_message_xml(request, F_CRM_DATA, msg_data);
}
free(reference);
free(true_from);
return request;
}
/*
* This method adds a copy of xml_response_data
*/
xmlNode *
create_reply_adv(xmlNode * original_request, xmlNode * xml_response_data, const char *origin)
{
xmlNode *reply = NULL;
const char *host_from = crm_element_value(original_request, F_CRM_HOST_FROM);
const char *sys_from = crm_element_value(original_request, F_CRM_SYS_FROM);
const char *sys_to = crm_element_value(original_request, F_CRM_SYS_TO);
const char *type = crm_element_value(original_request, F_CRM_MSG_TYPE);
const char *operation = crm_element_value(original_request, F_CRM_TASK);
const char *crm_msg_reference = crm_element_value(original_request, F_CRM_REFERENCE);
if (type == NULL) {
crm_err("Cannot create new_message, no message type in original message");
CRM_ASSERT(type != NULL);
return NULL;
#if 0
} else if (strcasecmp(XML_ATTR_REQUEST, type) != 0) {
crm_err("Cannot create new_message, original message was not a request");
return NULL;
#endif
}
reply = create_xml_node(NULL, __FUNCTION__);
if (reply == NULL) {
crm_err("Cannot create new_message, malloc failed");
return NULL;
}
crm_xml_add(reply, F_CRM_ORIGIN, origin);
crm_xml_add(reply, F_TYPE, T_CRM);
crm_xml_add(reply, F_CRM_VERSION, CRM_FEATURE_SET);
crm_xml_add(reply, F_CRM_MSG_TYPE, XML_ATTR_RESPONSE);
crm_xml_add(reply, F_CRM_REFERENCE, crm_msg_reference);
crm_xml_add(reply, F_CRM_TASK, operation);
/* since this is a reply, we reverse the from and to */
crm_xml_add(reply, F_CRM_SYS_TO, sys_from);
crm_xml_add(reply, F_CRM_SYS_FROM, sys_to);
/* HOSTTO will be ignored if it is to the DC anyway. */
if (host_from != NULL && strlen(host_from) > 0) {
crm_xml_add(reply, F_CRM_HOST_TO, host_from);
}
if (xml_response_data != NULL) {
add_message_xml(reply, F_CRM_DATA, xml_response_data);
}
return reply;
}
/* Libqb based IPC */
/* Server... */
GHashTable *client_connections = NULL;
crm_client_t *
crm_client_get(qb_ipcs_connection_t * c)
{
if (client_connections) {
return g_hash_table_lookup(client_connections, c);
}
crm_trace("No client found for %p", c);
return NULL;
}
crm_client_t *
crm_client_get_by_id(const char *id)
{
gpointer key;
crm_client_t *client;
GHashTableIter iter;
if (client_connections && id) {
g_hash_table_iter_init(&iter, client_connections);
while (g_hash_table_iter_next(&iter, &key, (gpointer *) & client)) {
if (strcmp(client->id, id) == 0) {
return client;
}
}
}
crm_trace("No client found with id=%s", id);
return NULL;
}
const char *
crm_client_name(crm_client_t * c)
{
if (c == NULL) {
return "null";
} else if (c->name == NULL && c->id == NULL) {
return "unknown";
} else if (c->name == NULL) {
return c->id;
} else {
return c->name;
}
}
void
crm_client_init(void)
{
if (client_connections == NULL) {
crm_trace("Creating client hash table");
client_connections = g_hash_table_new(g_direct_hash, g_direct_equal);
}
}
void
crm_client_cleanup(void)
{
if (client_connections != NULL) {
int active = g_hash_table_size(client_connections);
if (active) {
crm_err("Exiting with %d active connections", active);
}
g_hash_table_destroy(client_connections); client_connections = NULL;
}
}
void
crm_client_disconnect_all(qb_ipcs_service_t *service)
{
qb_ipcs_connection_t *c = NULL;
if (service == NULL) {
return;
}
c = qb_ipcs_connection_first_get(service);
while (c != NULL) {
qb_ipcs_connection_t *last = c;
c = qb_ipcs_connection_next_get(service, last);
/* There really shouldn't be anyone connected at this point */
crm_notice("Disconnecting client %p, pid=%d...", last, crm_ipcs_client_pid(last));
qb_ipcs_disconnect(last);
qb_ipcs_connection_unref(last);
}
}
/*!
* \internal
* \brief Allocate a new crm_client_t object based on an IPC connection
*
* \param[in] c IPC connection (or NULL to allocate generic client)
* \param[in] key Connection table key (or NULL to use sane default)
* \param[in] uid_client UID corresponding to c (ignored if c is NULL)
*
* \return Pointer to new crm_client_t (or NULL on error)
*/
static crm_client_t *
client_from_connection(qb_ipcs_connection_t *c, void *key, uid_t uid_client)
{
crm_client_t *client = calloc(1, sizeof(crm_client_t));
if (client == NULL) {
crm_perror(LOG_ERR, "Allocating client");
return NULL;
}
if (c) {
#if ENABLE_ACL
client->user = uid2username(uid_client);
if (client->user == NULL) {
client->user = strdup("#unprivileged");
CRM_CHECK(client->user != NULL, free(client); return NULL);
crm_err("Unable to enforce ACLs for user ID %d, assuming unprivileged",
uid_client);
}
#endif
client->ipcs = c;
client->kind = CRM_CLIENT_IPC;
client->pid = crm_ipcs_client_pid(c);
if (key == NULL) {
key = c;
}
}
client->id = crm_generate_uuid();
if (client->id == NULL) {
crm_err("Could not generate UUID for client");
free(client->user);
free(client);
return NULL;
}
if (key == NULL) {
key = client->id;
}
g_hash_table_insert(client_connections, key, client);
return client;
}
/*!
* \brief Allocate a new crm_client_t object and generate its ID
*
* \param[in] key What to use as connections hash table key (NULL to use ID)
*
* \return Pointer to new crm_client_t (asserts on failure)
*/
crm_client_t *
crm_client_alloc(void *key)
{
crm_client_t *client = client_from_connection(NULL, key, 0);
CRM_ASSERT(client != NULL);
return client;
}
crm_client_t *
crm_client_new(qb_ipcs_connection_t * c, uid_t uid_client, gid_t gid_client)
{
static gid_t uid_cluster = 0;
static gid_t gid_cluster = 0;
crm_client_t *client = NULL;
CRM_CHECK(c != NULL, return NULL);
if (uid_cluster == 0) {
if (crm_user_lookup(CRM_DAEMON_USER, &uid_cluster, &gid_cluster) < 0) {
static bool need_log = TRUE;
if (need_log) {
crm_warn("Could not find user and group IDs for user %s",
CRM_DAEMON_USER);
need_log = FALSE;
}
}
}
if (uid_client != 0) {
crm_trace("Giving access to group %u", gid_cluster);
/* Passing -1 to chown(2) means don't change */
qb_ipcs_connection_auth_set(c, -1, gid_cluster, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
}
crm_client_init();
/* TODO: Do our own auth checking, return NULL if unauthorized */
client = client_from_connection(c, NULL, uid_client);
if (client == NULL) {
return NULL;
}
if ((uid_client == 0) || (uid_client == uid_cluster)) {
/* Remember when a connection came from root or hacluster */
set_bit(client->flags, crm_client_flag_ipc_privileged);
}
crm_debug("Connecting %p for uid=%d gid=%d pid=%u id=%s", c, uid_client, gid_client, client->pid, client->id);
return client;
}
void
crm_client_destroy(crm_client_t * c)
{
if (c == NULL) {
return;
}
if (client_connections) {
if (c->ipcs) {
crm_trace("Destroying %p/%p (%d remaining)",
c, c->ipcs, crm_hash_table_size(client_connections) - 1);
g_hash_table_remove(client_connections, c->ipcs);
} else {
crm_trace("Destroying remote connection %p (%d remaining)",
c, crm_hash_table_size(client_connections) - 1);
g_hash_table_remove(client_connections, c->id);
}
}
if (c->event_timer) {
g_source_remove(c->event_timer);
}
crm_debug("Destroying %d events", g_list_length(c->event_queue));
while (c->event_queue) {
struct iovec *event = c->event_queue->data;
c->event_queue = g_list_remove(c->event_queue, event);
free(event[0].iov_base);
free(event[1].iov_base);
free(event);
}
free(c->id);
free(c->name);
free(c->user);
if (c->remote) {
if (c->remote->auth_timeout) {
g_source_remove(c->remote->auth_timeout);
}
free(c->remote->buffer);
free(c->remote);
}
free(c);
}
/*!
* \brief Raise IPC eviction threshold for a client, if allowed
*
* \param[in,out] client Client to modify
* \param[in] queue_max New threshold (as string)
*
* \return TRUE if change was allowed, FALSE otherwise
*/
bool
crm_set_client_queue_max(crm_client_t *client, const char *qmax)
{
if (is_set(client->flags, crm_client_flag_ipc_privileged)) {
int qmax_int = crm_int_helper(qmax, NULL);
if ((errno == 0) && (qmax_int > 0)) {
client->queue_max = qmax_int;
return TRUE;
}
}
return FALSE;
}
int
crm_ipcs_client_pid(qb_ipcs_connection_t * c)
{
struct qb_ipcs_connection_stats stats;
stats.client_pid = 0;
qb_ipcs_connection_stats_get(c, &stats, 0);
return stats.client_pid;
}
xmlNode *
crm_ipcs_recv(crm_client_t * c, void *data, size_t size, uint32_t * id, uint32_t * flags)
{
xmlNode *xml = NULL;
char *uncompressed = NULL;
char *text = ((char *)data) + sizeof(struct crm_ipc_response_header);
struct crm_ipc_response_header *header = data;
if (id) {
*id = ((struct qb_ipc_response_header *)data)->id;
}
if (flags) {
*flags = header->flags;
}
if (is_set(header->flags, crm_ipc_proxied)) {
/* mark this client as being the endpoint of a proxy connection.
* Proxy connections responses are sent on the event channel to avoid
* blocking the proxy daemon (crmd) */
c->flags |= crm_client_flag_ipc_proxied;
}
if(header->version > PCMK_IPC_VERSION) {
crm_err("Filtering incompatible v%d IPC message, we only support versions <= %d",
header->version, PCMK_IPC_VERSION);
return NULL;
}
if (header->size_compressed) {
int rc = 0;
unsigned int size_u = 1 + header->size_uncompressed;
uncompressed = calloc(1, size_u);
crm_trace("Decompressing message data %u bytes into %u bytes",
header->size_compressed, size_u);
rc = BZ2_bzBuffToBuffDecompress(uncompressed, &size_u, text, header->size_compressed, 1, 0);
text = uncompressed;
if (rc != BZ_OK) {
crm_err("Decompression failed: %s (%d)", bz2_strerror(rc), rc);
free(uncompressed);
return NULL;
}
}
CRM_ASSERT(text[header->size_uncompressed - 1] == 0);
crm_trace("Received %.200s", text);
xml = string2xml(text);
free(uncompressed);
return xml;
}
ssize_t crm_ipcs_flush_events(crm_client_t * c);
static gboolean
crm_ipcs_flush_events_cb(gpointer data)
{
crm_client_t *c = data;
c->event_timer = 0;
crm_ipcs_flush_events(c);
return FALSE;
}
/*!
* \internal
* \brief Add progressive delay before next event queue flush
*
* \param[in,out] c Client connection to add delay to
* \param[in] queue_len Current event queue length
*/
static inline void
delay_next_flush(crm_client_t *c, unsigned int queue_len)
{
/* Delay a maximum of 5 seconds */
guint delay = (queue_len < 40)? (1000 + 100 * queue_len) : 5000;
c->event_timer = g_timeout_add(delay, crm_ipcs_flush_events_cb, c);
}
ssize_t
crm_ipcs_flush_events(crm_client_t * c)
{
ssize_t rc = 0;
unsigned int sent = 0;
unsigned int queue_len = 0;
if (c == NULL) {
return pcmk_ok;
} else if (c->event_timer) {
/* There is already a timer, wait until it goes off */
crm_trace("Timer active for %p - %d", c->ipcs, c->event_timer);
return pcmk_ok;
}
queue_len = g_list_length(c->event_queue);
while (c->event_queue && sent < 100) {
struct crm_ipc_response_header *header = NULL;
struct iovec *event = c->event_queue->data;
rc = qb_ipcs_event_sendv(c->ipcs, event, 2);
if (rc < 0) {
break;
}
sent++;
header = event[0].iov_base;
if (header->size_compressed) {
crm_trace("Event %d to %p[%d] (%lld compressed bytes) sent",
header->qb.id, c->ipcs, c->pid, (long long) rc);
} else {
crm_trace("Event %d to %p[%d] (%lld bytes) sent: %.120s",
header->qb.id, c->ipcs, c->pid, (long long) rc,
(char *) (event[1].iov_base));
}
c->event_queue = g_list_remove(c->event_queue, event);
free(event[0].iov_base);
free(event[1].iov_base);
free(event);
}
queue_len -= sent;
if (sent > 0 || queue_len) {
crm_trace("Sent %d events (%d remaining) for %p[%d]: %s (%lld)",
sent, queue_len, c->ipcs, c->pid,
pcmk_strerror(rc < 0 ? rc : 0), (long long) rc);
}
if (queue_len) {
/* Allow clients to briefly fall behind on processing incoming messages,
* but drop completely unresponsive clients so the connection doesn't
* consume resources indefinitely.
*/
if (queue_len > QB_MAX(c->queue_max, PCMK_IPC_DEFAULT_QUEUE_MAX)) {
if ((c->queue_backlog <= 1) || (queue_len < c->queue_backlog)) {
/* Don't evict for a new or shrinking backlog */
crm_warn("Client with process ID %u has a backlog of %u messages "
CRM_XS " %p", c->pid, queue_len, c->ipcs);
} else {
crm_err("Evicting client with process ID %u due to backlog of %u messages "
CRM_XS " %p", c->pid, queue_len, c->ipcs);
c->queue_backlog = 0;
qb_ipcs_disconnect(c->ipcs);
return rc;
}
}
c->queue_backlog = queue_len;
delay_next_flush(c, queue_len);
} else {
/* Event queue is empty, there is no backlog */
c->queue_backlog = 0;
}
return rc;
}
ssize_t
crm_ipc_prepare(uint32_t request, xmlNode * message, struct iovec ** result, uint32_t max_send_size)
{
static unsigned int biggest = 0;
struct iovec *iov;
unsigned int total = 0;
char *compressed = NULL;
char *buffer = dump_xml_unformatted(message);
struct crm_ipc_response_header *header = calloc(1, sizeof(struct crm_ipc_response_header));
CRM_ASSERT(result != NULL);
crm_ipc_init();
if (max_send_size == 0) {
max_send_size = ipc_buffer_max;
}
CRM_LOG_ASSERT(max_send_size != 0);
*result = NULL;
iov = calloc(2, sizeof(struct iovec));
iov[0].iov_len = hdr_offset;
iov[0].iov_base = header;
header->version = PCMK_IPC_VERSION;
header->size_uncompressed = 1 + strlen(buffer);
total = iov[0].iov_len + header->size_uncompressed;
if (total < max_send_size) {
iov[1].iov_base = buffer;
iov[1].iov_len = header->size_uncompressed;
} else {
unsigned int new_size = 0;
if (crm_compress_string
(buffer, header->size_uncompressed, max_send_size, &compressed, &new_size)) {
header->flags |= crm_ipc_compressed;
header->size_compressed = new_size;
iov[1].iov_len = header->size_compressed;
iov[1].iov_base = compressed;
free(buffer);
biggest = QB_MAX(header->size_compressed, biggest);
} else {
ssize_t rc = -EMSGSIZE;
crm_log_xml_trace(message, "EMSGSIZE");
biggest = QB_MAX(header->size_uncompressed, biggest);
crm_err
("Could not compress the message (%u bytes) into less than the configured ipc limit (%u bytes). "
"Set PCMK_ipc_buffer to a higher value (%u bytes suggested)",
header->size_uncompressed, max_send_size, 4 * biggest);
free(compressed);
free(buffer);
free(header);
free(iov);
return rc;
}
}
header->qb.size = iov[0].iov_len + iov[1].iov_len;
header->qb.id = (int32_t)request; /* Replying to a specific request */
*result = iov;
CRM_ASSERT(header->qb.size > 0);
return header->qb.size;
}
ssize_t
crm_ipcs_sendv(crm_client_t * c, struct iovec * iov, enum crm_ipc_flags flags)
{
ssize_t rc;
static uint32_t id = 1;
struct crm_ipc_response_header *header = iov[0].iov_base;
if (c->flags & crm_client_flag_ipc_proxied) {
/* _ALL_ replies to proxied connections need to be sent as events */
if (is_not_set(flags, crm_ipc_server_event)) {
flags |= crm_ipc_server_event;
/* this flag lets us know this was originally meant to be a response.
* even though we're sending it over the event channel. */
flags |= crm_ipc_proxied_relay_response;
}
}
header->flags |= flags;
if (flags & crm_ipc_server_event) {
header->qb.id = id++; /* We don't really use it, but doesn't hurt to set one */
if (flags & crm_ipc_server_free) {
crm_trace("Sending the original to %p[%d]", c->ipcs, c->pid);
c->event_queue = g_list_append(c->event_queue, iov);
} else {
struct iovec *iov_copy = calloc(2, sizeof(struct iovec));
crm_trace("Sending a copy to %p[%d]", c->ipcs, c->pid);
iov_copy[0].iov_len = iov[0].iov_len;
iov_copy[0].iov_base = malloc(iov[0].iov_len);
memcpy(iov_copy[0].iov_base, iov[0].iov_base, iov[0].iov_len);
iov_copy[1].iov_len = iov[1].iov_len;
iov_copy[1].iov_base = malloc(iov[1].iov_len);
memcpy(iov_copy[1].iov_base, iov[1].iov_base, iov[1].iov_len);
c->event_queue = g_list_append(c->event_queue, iov_copy);
}
} else {
CRM_LOG_ASSERT(header->qb.id != 0); /* Replying to a specific request */
rc = qb_ipcs_response_sendv(c->ipcs, iov, 2);
if (rc < header->qb.size) {
crm_notice("Response %d to %p[%d] (%u bytes) failed: %s (%d)",
header->qb.id, c->ipcs, c->pid, header->qb.size, pcmk_strerror(rc), rc);
} else {
crm_trace("Response %d sent, %lld bytes to %p[%d]",
header->qb.id, (long long) rc, c->ipcs, c->pid);
}
if (flags & crm_ipc_server_free) {
free(iov[0].iov_base);
free(iov[1].iov_base);
free(iov);
}
}
if (flags & crm_ipc_server_event) {
rc = crm_ipcs_flush_events(c);
} else {
crm_ipcs_flush_events(c);
}
if (rc == -EPIPE || rc == -ENOTCONN) {
crm_trace("Client %p disconnected", c->ipcs);
}
return rc;
}
ssize_t
crm_ipcs_send(crm_client_t * c, uint32_t request, xmlNode * message,
enum crm_ipc_flags flags)
{
struct iovec *iov = NULL;
ssize_t rc = 0;
if(c == NULL) {
return -EDESTADDRREQ;
}
crm_ipc_init();
rc = crm_ipc_prepare(request, message, &iov, ipc_buffer_max);
if (rc > 0) {
rc = crm_ipcs_sendv(c, iov, flags | crm_ipc_server_free);
} else {
free(iov);
crm_notice("Message to %p[%d] failed: %s (%d)",
c->ipcs, c->pid, pcmk_strerror(rc), rc);
}
return rc;
}
void
crm_ipcs_send_ack(crm_client_t * c, uint32_t request, uint32_t flags, const char *tag, const char *function,
int line)
{
if (flags & crm_ipc_client_response) {
xmlNode *ack = create_xml_node(NULL, tag);
crm_trace("Ack'ing msg from %s (%p)", crm_client_name(c), c);
c->request_id = 0;
crm_xml_add(ack, "function", function);
crm_xml_add_int(ack, "line", line);
crm_ipcs_send(c, request, ack, flags);
free_xml(ack);
}
}
/* Client... */
#define MIN_MSG_SIZE 12336 /* sizeof(struct qb_ipc_connection_response) */
#define MAX_MSG_SIZE 128*1024 /* 128k default */
struct crm_ipc_s {
struct pollfd pfd;
/* the max size we can send/receive over ipc */
unsigned int max_buf_size;
/* Size of the allocated 'buffer' */
unsigned int buf_size;
int msg_size;
int need_reply;
char *buffer;
char *name;
uint32_t buffer_flags;
qb_ipcc_connection_t *ipc;
};
static unsigned int
pick_ipc_buffer(unsigned int max)
{
static unsigned int global_max = 0;
if (global_max == 0) {
const char *env = getenv("PCMK_ipc_buffer");
if (env) {
int env_max = crm_parse_int(env, "0");
global_max = (env_max > 0)? QB_MAX(MIN_MSG_SIZE, env_max) : MAX_MSG_SIZE;
} else {
global_max = MAX_MSG_SIZE;
}
}
return QB_MAX(max, global_max);
}
crm_ipc_t *
crm_ipc_new(const char *name, size_t max_size)
{
crm_ipc_t *client = NULL;
client = calloc(1, sizeof(crm_ipc_t));
client->name = strdup(name);
client->buf_size = pick_ipc_buffer(max_size);
client->buffer = malloc(client->buf_size);
/* Clients initiating connection pick the max buf size */
client->max_buf_size = client->buf_size;
client->pfd.fd = -1;
client->pfd.events = POLLIN;
client->pfd.revents = 0;
return client;
}
/*!
* \brief Establish an IPC connection to a Pacemaker component
*
* \param[in] client Connection instance obtained from crm_ipc_new()
*
* \return TRUE on success, FALSE otherwise (in which case errno will be set;
* specifically, in case of discovering the remote side is not
* authentic, its value is set to ECONNABORTED).
*/
bool
crm_ipc_connect(crm_ipc_t * client)
{
static uid_t cl_uid = 0;
static gid_t cl_gid = 0;
pid_t found_pid = 0; uid_t found_uid = 0; gid_t found_gid = 0;
int rv;
client->need_reply = FALSE;
client->ipc = qb_ipcc_connect(client->name, client->buf_size);
if (client->ipc == NULL) {
crm_debug("Could not establish %s connection: %s (%d)", client->name, pcmk_strerror(errno), errno);
return FALSE;
}
client->pfd.fd = crm_ipc_get_fd(client);
if (client->pfd.fd < 0) {
rv = errno;
/* message already omitted */
crm_ipc_close(client);
errno = rv;
return FALSE;
}
if (!cl_uid && !cl_gid
&& (rv = crm_user_lookup(CRM_DAEMON_USER, &cl_uid, &cl_gid)) < 0) {
errno = -rv;
/* message already omitted */
crm_ipc_close(client);
errno = -rv;
return FALSE;
}
if (!(rv = crm_ipc_is_authentic_process(client->pfd.fd, cl_uid, cl_gid,
&found_pid, &found_uid,
&found_gid))) {
crm_err("Daemon (IPC %s) is not authentic:"
" process %lld (uid: %lld, gid: %lld)",
client->name, (long long) PCMK__SPECIAL_PID_AS_0(found_pid),
(long long) found_uid, (long long) found_gid);
crm_ipc_close(client);
errno = ECONNABORTED;
return FALSE;
} else if (rv < 0) {
errno = -rv;
crm_perror(LOG_ERR, "Could not verify authenticity of daemon (IPC %s)",
client->name);
crm_ipc_close(client);
errno = -rv;
return FALSE;
}
qb_ipcc_context_set(client->ipc, client);
#ifdef HAVE_IPCS_GET_BUFFER_SIZE
client->max_buf_size = qb_ipcc_get_buffer_size(client->ipc);
if (client->max_buf_size > client->buf_size) {
free(client->buffer);
client->buffer = calloc(1, client->max_buf_size);
client->buf_size = client->max_buf_size;
}
#endif
return TRUE;
}
void
crm_ipc_close(crm_ipc_t * client)
{
if (client) {
crm_trace("Disconnecting %s IPC connection %p (%p)", client->name, client, client->ipc);
if (client->ipc) {
qb_ipcc_connection_t *ipc = client->ipc;
client->ipc = NULL;