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rrd_client.c
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/**
* RRDtool - src/rrd_client.c
* Copyright (C) 2008-2013 Florian octo Forster
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Florian octo Forster <octo at verplant.org>
* Sebastian tokkee Harl <sh at tokkee.org>
**/
#ifdef _WIN32
#include <ws2tcpip.h> // contain #include <winsock2.h>
#ifdef _MSC_VER
// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")
#endif
#include <time.h>
#include <io.h>
#include <fcntl.h>
#include <tchar.h>
#include <locale.h>
#endif
#ifdef __MINGW32__
#define realpath(N,R) _fullpath((R),(N),_MAX_PATH)
#endif
#include "rrd_strtod.h"
#include "rrd.h"
#include "rrd_tool.h"
#include "rrd_client.h"
#include "mutex.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#ifndef _WIN32
#include <strings.h>
#include <pthread.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <locale.h>
#endif
#include <sys/types.h>
#include <limits.h>
struct rrdc_response_s {
int status;
char *message;
char **lines;
size_t lines_num;
};
typedef struct rrdc_response_s rrdc_response_t;
struct rrd_client {
int sd;
char *sd_path;
char _inbuf[RRD_CMD_MAX];
char *inbuf;
size_t inbuf_used;
};
static rrd_client_t default_client = { -1, NULL, {0}, NULL, 0 };
static mutex_t lock = MUTEX_INITIALIZER;
static int reconnect(
rrd_client_t *client);
/* get_path: Return a path name appropriate to be sent to the daemon.
*
* When talking to a local daemon (thru a UNIX socket), relative path names
* are resolved to absolute path names to allow for transparent integration
* into existing solutions (as requested by Tobi). Else, absolute path names
* are not allowed, since path name translation is done by the server.
*
* The caller must call free() on the returned value.
*
* One must hold `lock' when calling this function with `default_client'. */
static char *get_path(
rrd_client_t *client,
const char *path)
{ /* {{{ */
char *ret = NULL;
const char *strip = getenv(ENV_RRDCACHED_STRIPPATH);
size_t len;
int is_unix = 0;
if ((client == NULL) || (path == NULL) || (client->sd_path == NULL))
return (NULL);
if ((*client->sd_path == '/')
|| (strncmp("unix:", client->sd_path, strlen("unix:")) == 0))
is_unix = 1;
if (is_unix) {
if (path == NULL || strlen(path) == 0)
return NULL;
ret = realpath(path, NULL);
if (ret == NULL) {
/* this may happen, because the file DOES NOT YET EXIST (as would be
* the case for rrdcreate) - retry by stripping the last path element,
* resolving the directory and re-concatenate them.... */
char *dir_path;
char *lastslash = strrchr(path, '/');
char *dir = (lastslash == NULL
|| lastslash == path) ? strdup(".")
#ifdef HAVE_STRNDUP
: strndup(path, lastslash - path);
#else
: strdup(path);
if (lastslash && lastslash != path) {
dir[lastslash - path] = '\0';
}
#endif
if (dir != NULL) {
dir_path = realpath(dir, NULL);
free(dir);
if (dir_path == NULL) {
rrd_set_error("realpath(%s): %s", path,
rrd_strerror(errno));
return NULL;
}
ret = malloc(strlen(dir_path)
+ (lastslash ? strlen(lastslash) : 1 +
strlen(path)) + 1);
if (ret == NULL) {
rrd_set_error("cannot allocate memory");
free(dir_path);
return NULL;
}
strcpy(ret, dir_path);
if (lastslash != NULL) {
strcat(ret, lastslash);
} else {
strcat(ret, "/");
strcat(ret, path);
}
free(dir_path);
} else {
// out of memory
rrd_set_error("cannot allocate memory");
ret = NULL; // redundant, but make intention clear
}
}
return ret;
} else {
if (*path == '/') { /* absolute path */
/* if we are stripping, then check and remove the head */
if (strip) {
len = strlen(strip);
if (strncmp(path, strip, len) == 0) {
path += len;
while (*path == '/')
path++;
return strdup(path);
}
} else
rrd_set_error("absolute path names not allowed when talking "
"to a remote daemon");
return NULL;
}
}
return strdup(path);
} /* }}} char *get_path */
static size_t strsplit(
char *string,
char **fields,
size_t size)
{ /* {{{ */
size_t i;
char *ptr;
char *saveptr;
i = 0;
ptr = string;
saveptr = NULL;
while ((fields[i] = strtok_r(ptr, " \t\r\n", &saveptr)) != NULL) {
ptr = NULL;
i++;
if (i >= size)
break;
}
return (i);
} /* }}} size_t strsplit */
static int parse_header(
char *line, /* {{{ */
char **ret_key,
char **ret_value)
{
char *tmp;
*ret_key = line;
tmp = strchr(line, ':');
if (tmp == NULL)
return (-1);
do {
*tmp = 0;
tmp++;
}
while ((tmp[0] == ' ') || (tmp[0] == '\t'));
if (*tmp == 0)
return (-1);
*ret_value = tmp;
return (0);
} /* }}} int parse_header */
static int parse_ulong_header(
char *line, /* {{{ */
char **ret_key,
unsigned long *ret_value)
{
char *str_value;
char *endptr;
int status;
str_value = NULL;
status = parse_header(line, ret_key, &str_value);
if (status != 0)
return (status);
endptr = NULL;
errno = 0;
*ret_value = (unsigned long) strtol(str_value, &endptr, /* base = */ 0);
if ((endptr == str_value) || (errno != 0))
return (-1);
return (0);
} /* }}} int parse_ulong_header */
static int parse_char_array_header(
char *line, /* {{{ */
char **ret_key,
char **array,
size_t array_len,
int alloc)
{
char **tmp_array;
char *value;
size_t num;
int status;
if ((tmp_array = (char **) malloc(array_len * sizeof(char *))) == NULL)
return (-1);
value = NULL;
status = parse_header(line, ret_key, &value);
if (status != 0) {
free(tmp_array);
return (-1);
}
num = strsplit(value, tmp_array, array_len);
if (num != array_len) {
free(tmp_array);
return (-1);
}
if (alloc == 0) {
memcpy(array, tmp_array, array_len * sizeof(char *));
} else {
size_t i;
for (i = 0; i < array_len; i++)
array[i] = strdup(tmp_array[i]);
}
free(tmp_array);
return (0);
} /* }}} int parse_char_array_header */
static int parse_value_array_header(
char *line, /* {{{ */
time_t *ret_time,
rrd_value_t *array,
size_t array_len)
{
char *str_key;
char **str_array;
char *endptr;
int status;
size_t i;
double tmp;
if ((str_array = (char **) malloc(array_len * sizeof(char *))) == NULL)
return (-1);
str_key = NULL;
status = parse_char_array_header(line, &str_key,
str_array, array_len, /* alloc = */ 0);
if (status != 0) {
free(str_array);
return (-1);
}
errno = 0;
endptr = NULL;
*ret_time = (time_t) strtol(str_key, &endptr, /* base = */ 10);
if ((endptr == str_key) || (errno != 0)) {
free(str_array);
return (-1);
}
/* Enforce the "C" locale so that parsing of the response is not dependent on
* the locale. For example, when using a German locale the strtod() function
* will expect a comma as the decimal separator, i.e. "42,77". */
for (i = 0; i < array_len; i++) {
if (rrd_strtodbl(str_array[i], 0, &tmp, "parse_value_array_header") ==
2) {
array[i] = (rrd_value_t) tmp;
} else {
free(str_array);
return (-1);
}
}
free(str_array);
return (0);
} /* }}} int parse_value_array_header */
static void close_socket(
rrd_client_t *client)
{
if (client->sd >= 0) {
#ifdef _WIN32
closesocket(client->sd);
WSACleanup();
#else
close(client->sd);
#endif
}
client->sd = -1;
client->inbuf = NULL;
client->inbuf_used = 0;
}
static void close_connection(
rrd_client_t *client)
{ /* {{{ */
if (client == NULL)
return;
close_socket(client);
if (client->sd_path != NULL)
free(client->sd_path);
client->sd_path = NULL;
} /* }}} void close_connection */
static int buffer_add_string(
const char *str, /* {{{ */
char **buffer_ret,
size_t *buffer_size_ret)
{
char *buffer;
size_t buffer_size;
size_t buffer_pos;
size_t i;
int status;
buffer = *buffer_ret;
buffer_size = *buffer_size_ret;
buffer_pos = 0;
i = 0;
status = -1;
while (buffer_pos < buffer_size) {
if (str[i] == 0) {
buffer[buffer_pos] = ' ';
buffer_pos++;
status = 0;
break;
} else if ((str[i] == ' ') || (str[i] == '\\')) {
if (buffer_pos >= (buffer_size - 1))
break;
buffer[buffer_pos] = '\\';
buffer_pos++;
buffer[buffer_pos] = str[i];
buffer_pos++;
} else {
buffer[buffer_pos] = str[i];
buffer_pos++;
}
i++;
} /* while (buffer_pos < buffer_size) */
if (status != 0)
return (-1);
*buffer_ret = buffer + buffer_pos;
*buffer_size_ret = buffer_size - buffer_pos;
return (0);
} /* }}} int buffer_add_string */
static int buffer_add_value(
const char *value, /* {{{ */
char **buffer_ret,
size_t *buffer_size_ret)
{
char temp[RRD_CMD_MAX];
if (strncmp(value, "N:", 2) == 0)
snprintf(temp, sizeof(temp), "%lu:%s",
(unsigned long) time(NULL), value + 2);
else
strncpy(temp, value, sizeof(temp));
temp[sizeof(temp) - 1] = 0;
return (buffer_add_string(temp, buffer_ret, buffer_size_ret));
} /* }}} int buffer_add_value */
static int buffer_add_ulong(
const unsigned long value, /* {{{ */
char **buffer_ret,
size_t *buffer_size_ret)
{
char temp[RRD_CMD_MAX];
snprintf(temp, sizeof(temp), "%lu", value);
temp[sizeof(temp) - 1] = 0;
return (buffer_add_string(temp, buffer_ret, buffer_size_ret));
} /* }}} int buffer_add_ulong */
/* Remove trailing newline (NL) and carriage return (CR) characters. Similar to
* the Perl function `chomp'. Returns the number of characters that have been
* removed. */
static int chomp(
char *str)
{ /* {{{ */
size_t len;
int removed;
if (str == NULL)
return (-1);
len = strlen(str);
removed = 0;
while ((len > 0) && ((str[len - 1] == '\n') || (str[len - 1] == '\r'))) {
str[len - 1] = 0;
len--;
removed++;
}
return (removed);
} /* }}} int chomp */
static void response_free(
rrdc_response_t *res)
{ /* {{{ */
if (res == NULL)
return;
if (res->lines != NULL) {
size_t i;
for (i = 0; i < res->lines_num; i++)
if (res->lines[i] != NULL)
free(res->lines[i]);
free(res->lines);
}
if (res->message != NULL)
free(res->message);
free(res);
} /* }}} void response_free */
static int recvline(
rrd_client_t *client,
char *buf,
size_t n)
{ /* {{{ */
size_t len;
char *s, *p, *t;
/* Sanity check */
if ((client == NULL) || (n <= 0))
return (-1);
s = buf;
n--; /* leave space for the NULL */
while (n != 0) {
/*
* If the buffer is empty, refill it.
*/
if (((len = client->inbuf_used) <= 0) || (client->inbuf == NULL)) {
client->inbuf = client->_inbuf;
client->inbuf_used =
recv(client->sd, client->inbuf, RRD_CMD_MAX, 0);
if (client->inbuf_used <= 0) {
if (s == buf) {
/* EOF/error: stop with partial or no line */
return (-1);
}
}
len = client->inbuf_used;
}
p = client->inbuf;
/*
* Scan through at most n bytes of the current buffer,
* looking for '\n'. If found, copy up to and including
* newline, and stop. Otherwise, copy entire chunk
* and loop.
*/
if (len > n)
len = n;
t = (char *) memchr((void *) p, '\n', len);
if (t != NULL) {
len = ++t - p;
client->inbuf_used -= len;
client->inbuf = t;
(void) memcpy((void *) s, (void *) p, len);
s[len] = 0;
return (1);
}
client->inbuf_used -= len;
client->inbuf += len;
(void) memcpy((void *) s, (void *) p, len);
s += len;
n -= len;
}
*s = 0;
return (1);
} /* }}} int recvline */
static int response_read(
rrd_client_t *client,
rrdc_response_t **ret_response)
{ /* {{{ */
rrdc_response_t *ret = NULL;
int status = 0;
char buffer[RRD_CMD_MAX];
char *message_ptr;
size_t i;
#define DIE(code) do { status = code; goto err_out; } while(0)
if ((client == NULL) || (client->sd == -1))
DIE(-1);
ret = (rrdc_response_t *) malloc(sizeof(rrdc_response_t));
if (ret == NULL)
DIE(-2);
memset(ret, 0, sizeof(*ret));
ret->message = NULL;
ret->lines = NULL;
ret->lines_num = 0;
if (recvline(client, buffer, sizeof(buffer)) == -1)
DIE(-3);
chomp(buffer);
ret->status = strtol(buffer, &message_ptr, 0);
if (buffer == message_ptr)
DIE(-4);
/* Skip leading whitespace of the status message */
message_ptr += strspn(message_ptr, " \t");
ret->message = strdup(message_ptr);
if (ret->message == NULL)
DIE(-5);
if (ret->status <= 0) {
if (ret->status < 0)
rrd_set_error("rrdcached@%s: %s", client->sd_path, ret->message);
goto out;
}
ret->lines = (char **) malloc(sizeof(char *) * ret->status);
if (ret->lines == NULL)
DIE(-6);
memset(ret->lines, 0, sizeof(char *) * ret->status);
ret->lines_num = (size_t) ret->status;
for (i = 0; i < ret->lines_num; i++) {
if (recvline(client, buffer, sizeof(buffer)) == -1)
DIE(-7);
chomp(buffer);
ret->lines[i] = strdup(buffer);
if (ret->lines[i] == NULL)
DIE(-8);
}
out:
*ret_response = ret;
return (status);
err_out:
response_free(ret);
close_connection(client);
return (status);
#undef DIE
} /* }}} rrdc_response_t *response_read */
static int sendall(
rrd_client_t *client, /* {{{ */
const char *msg,
size_t len,
int allow_retry)
{
int ret = 0;
char *bufp = (char *) msg;
if (client == NULL)
return -1;
while (ret != -1 && len > 0) {
ret = send(client->sd, msg, len, 0);
if (ret > 0) {
bufp += ret;
len -= ret;
}
}
if ((ret < 0) && allow_retry) {
/* Try to reconnect and start over.
* Don't further allow retries to avoid endless loops. */
if (reconnect(client) == 0)
return sendall(client, msg, len, 0);
}
return ret;
} /* }}} int sendall */
static int request(
rrd_client_t *client,
const char *buffer,
size_t buffer_size, /* {{{ */
rrdc_response_t **ret_response)
{
int status;
rrdc_response_t *res;
if ((client == NULL) || (client->sd == -1))
return (ENOTCONN);
status = sendall(client, buffer, buffer_size, 1);
if (status == -1) {
close_connection(client);
rrd_set_error("request: socket error (%d) while talking to rrdcached",
status);
return (-1);
}
res = NULL;
status = response_read(client, &res);
if (status != 0) {
if (status < 0)
rrd_set_error
("request: internal error while talking to rrdcached");
return (status);
}
*ret_response = res;
return (0);
} /* }}} int request */
int rrd_client_is_connected(
rrd_client_t *client)
{ /* {{{ */
return (client != NULL) && (client->sd >= 0);
} /* }}} rrd_client_is_connected */
const char *rrd_client_address(
rrd_client_t *client)
{ /* {{{ */
if (!client)
return NULL;
return client->sd_path;
} /* }}} rrd_client_address */
/* determine whether we are connected to the specified daemon_addr if
* NULL, return whether we are connected at all
*/
int rrdc_is_connected(
const char *daemon_addr)
{ /* {{{ */
if (default_client.sd < 0)
return 0;
else if (daemon_addr == NULL) {
char *addr = getenv(ENV_RRDCACHED_ADDRESS);
/* here we have to handle the case i.e.
* UPDATE --daemon ...; UPDATEV (no --daemon) ...
* In other words: we have a cached connection,
* but it is not specified in the current command.
* Daemon is only implied in this case if set in ENV
*/
if (addr != NULL && strcmp(addr, "") != 0)
return 1;
else
return 0;
} else if (strcmp(daemon_addr, default_client.sd_path) == 0)
return 1;
else
return 0;
} /* }}} int rrdc_is_connected */
/* determine whether we are connected to any daemon */
int rrdc_is_any_connected(
void)
{
return default_client.sd >= 0;
}
int rrd_client_ping(
rrd_client_t *client)
{ /* {{{ */
int status;
rrdc_response_t *res = NULL;
status = request(client, "PING\n", strlen("PING\n"), &res);
if (status != 0)
return 0;
status = res->status;
response_free(res);
return status == 0;
} /* }}} int rrd_client_ping */
int rrdc_ping(
void)
{ /* {{{ */
int status;
mutex_lock(&lock);
status = rrd_client_ping(&default_client);
mutex_unlock(&lock);
return status;
} /* }}} int rrdc_ping */
static int connect_unix(
rrd_client_t *client,
const char *path)
{ /* {{{ */
#ifdef _WIN32
/* Silence unused parameter compiler warnings */
(void) client;
(void) path;
return (WSAEPROTONOSUPPORT);
#else
struct sockaddr_un sa;
int status;
assert(path != NULL);
assert(client->sd == -1);
client->sd = socket(PF_UNIX, SOCK_STREAM, /* protocol = */ 0);
if (client->sd < 0) {
status = errno;
return (status);
}
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_UNIX;
strncpy(sa.sun_path, path, sizeof(sa.sun_path) - 1);
status = connect(client->sd, (struct sockaddr *) &sa, sizeof(sa));
if (status != 0) {
status = errno;
close_connection(client);
return (status);
}
return (0);
#endif
} /* }}} int connect_unix */
static int connect_network(
rrd_client_t *client,
const char *addr_orig)
{ /* {{{ */
struct addrinfo ai_hints;
struct addrinfo *ai_res;
struct addrinfo *ai_ptr;
char addr_copy[NI_MAXHOST];
char *addr;
char *port;
assert(addr_orig != NULL);
assert(client->sd == -1);
strncpy(addr_copy, addr_orig, sizeof(addr_copy));
addr_copy[sizeof(addr_copy) - 1] = '\0';
addr = addr_copy;
int status;
memset(&ai_hints, 0, sizeof(ai_hints));
ai_hints.ai_flags = 0;
#ifdef AI_ADDRCONFIG
ai_hints.ai_flags |= AI_ADDRCONFIG;
#endif
ai_hints.ai_family = AF_UNSPEC;
ai_hints.ai_socktype = SOCK_STREAM;
port = NULL;
if (*addr == '[') { /* IPv6+port format */
/* `addr' is something like "[2001:780:104:2:211:24ff:feab:26f8]:12345" */
addr++;
port = strchr(addr, ']');
if (port == NULL) {
rrd_set_error("malformed address: %s", addr_orig);
return (-1);
}
*port = 0;
port++;
if (*port == ':')
port++;
else if (*port == 0)
port = NULL;
else {
rrd_set_error("garbage after address: %s", port);
return (-1);
}
} /* if (*addr == '[') */
else {
port = strrchr(addr, ':');
if (port != NULL) {
*port = 0;
port++;
}
}
#ifdef _WIN32
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(2, 0);
status = WSAStartup(wVersionRequested, &wsaData);
if (status != 0) {
rrd_set_error("failed to initialize socket library %d", status);
return (-1);
}
#endif
ai_res = NULL;
status = getaddrinfo(addr,
port == NULL ? RRDCACHED_DEFAULT_PORT : port,
&ai_hints, &ai_res);
if (status != 0) {
rrd_set_error("failed to resolve address '%s' (port %s): %s (%d)",
addr, port == NULL ? RRDCACHED_DEFAULT_PORT : port,
gai_strerror(status), status);
return (-1);
}
for (ai_ptr = ai_res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) {
client->sd =
socket(ai_ptr->ai_family, ai_ptr->ai_socktype,
ai_ptr->ai_protocol);
if (client->sd < 0) {
status = errno;
client->sd = -1;
continue;
}
status = connect(client->sd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
if (status != 0) {
status = errno;
close_connection(client);
continue;
}
assert(status == 0);
break;
} /* for (ai_ptr) */
freeaddrinfo(ai_res);
return (status);
} /* }}} int connect_network */
static int client_connect(
rrd_client_t *client,
const char *addr)
{ /* {{{ */
rrd_clear_error();
if (strncmp("unix:", addr, strlen("unix:")) == 0)
return connect_unix(client, addr + strlen("unix:"));
else if (addr[0] == '/')
return connect_unix(client, addr);
return connect_network(client, addr);
} /* }}} int client_connect */
static int reconnect(
rrd_client_t *client)
{ /* {{{ */
if ((client == NULL) || (client->sd_path == NULL))
return -1;
close_socket(client);
return client_connect(client, client->sd_path);
} /* }}} int reconnect */
int rrd_client_connect(
rrd_client_t *client,
const char *addr)
{ /* {{{ */
int status = 0;
if (addr == NULL) {
addr = getenv(ENV_RRDCACHED_ADDRESS);
}
if ((client == NULL) || (addr == NULL) || (strcmp(addr, "") == 0)) {
return 0;
}
if ((client->sd >= 0) && (client->sd_path != NULL)
&& (strcmp(addr, client->sd_path) == 0)) {
/* connection to the same daemon; use existing connection */
return (0);
} else {
close_connection(client);
}
status = client_connect(client, addr);
if ((status == 0) && (client->sd >= 0))
client->sd_path = strdup(addr);
else {
char *err = rrd_test_error()? rrd_get_error() : "Internal error";
/* err points the string that gets written to by rrd_set_error(), thus we
* cannot pass it to that function */
err = strdup(err);
rrd_set_error("Unable to connect to rrdcached: %s", (status < 0)
? (err ? err : "Internal error")
: rrd_strerror(status));
if (err != NULL)
free(err);
}
return (status);
} /* }}} rrd_client_connect */
int rrdc_connect(
const char *addr)
{ /* {{{ */
int status;
mutex_lock(&lock);
status = rrd_client_connect(&default_client, addr);
mutex_unlock(&lock);
return status;
} /* }}} int rrdc_connect */
int rrdc_disconnect(
void)
{ /* {{{ */