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clixon/lib/src/clixon_client.c
Olof hagsand 85e2945ec9 * Netconf message-id attribute changed from optional to mandatory 
* Made NETCONF message handling more strict according to RFC 6241
  * Set `CLICON_NETCONF_MESSAGE_ID_OPTIONAL` to true to accept omission of message-id attribute
* Fixed: [need make sure message-id exist in rpc validate #240](https://github.com/clicon/clixon/issues/240)
2021-06-30 10:59:10 +02:00

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/*
*
***** BEGIN LICENSE BLOCK *****
Copyright (C) 2020-2021 Olof Hagsand and Rubicon Communications, LLC(Netgate)
This file is part of CLIXON.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 3 or later (the "GPL"),
in which case the provisions of the GPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of the GPL, and not to allow others to
use your version of this file under the terms of Apache License version 2, indicate
your decision by deleting the provisions above and replace them with the
notice and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the Apache License version 2 or the GPL.
***** END LICENSE BLOCK *****
*
*/
#ifdef HAVE_CONFIG_H
#include "clixon_config.h" /* generated by config & autoconf */
#endif
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/stat.h>
#include <netinet/in.h>
/* cligen */
#include <cligen/cligen.h>
#include "clixon_queue.h"
#include "clixon_string.h"
#include "clixon_hash.h"
#include "clixon_handle.h"
#include "clixon_log.h"
#include "clixon_err.h"
#include "clixon_yang.h"
#include "clixon_options.h"
#include "clixon_proc.h"
#include "clixon_xml.h"
#include "clixon_xml_nsctx.h"
#include "clixon_xml_io.h"
#include "clixon_xpath_ctx.h"
#include "clixon_xpath.h"
#include "clixon_netconf_lib.h"
#include "clixon_proto.h"
#include "clixon_proto_client.h"
#include "clixon_client.h"
/*
* Constants
*/
/* Netconf binary default, override with environment variable: CLIXON_NETCONF_BIN
* Could try to get path from install/makefile data
*/
#define CLIXON_NETCONF_BIN "/usr/local/bin/clixon_netconf"
#define CLIXON_CLIENT_MAGIC 0x54fe649a
#define chandle(ch) (assert(clixon_client_handle_check(ch)==0),(struct clixon_client_handle *)(ch))
/*! Internal structure of clixon client handle.
*/
struct clixon_client_handle{
uint32_t cch_magic; /* magic number */
clixon_client_type cch_type; /* Clixon socket type */
int cch_socket; /* Input/output socket */
int cch_pid; /* Sub-process-id Only applies for NETCONF/SSH */
int cch_locked; /* State variable: 1 means locked */
};
/*! Check struct magic number for sanity checks
* @param[in] h Clicon client handle
* @retval 0 Sanity check OK
* @retval -1 Sanity check failed
*/
static int
clixon_client_handle_check(clixon_client_handle ch)
{
/* Dont use handle macro to avoid recursion */
struct clixon_client_handle *cch = (struct clixon_client_handle *)(ch);
return cch->cch_magic == CLIXON_CLIENT_MAGIC ? 0 : -1;
}
/*! Initialize Clixon client API
* @param[in] config_file Clixon configuration file, or NULL for default
* @retval h Clixon handler
* @retval NULL Error
* @see clixon_client_close
*/
clixon_handle
clixon_client_init(const char *config_file)
{
clicon_handle h;
clicon_debug(1, "%s", __FUNCTION__);
/* Initiate CLICON handle. CLIgen is also initialized */
if ((h = clicon_handle_init()) == NULL)
return NULL;
/* Set clixon config file - reuse the one in the main installation */
clicon_option_str_set(h, "CLICON_CONFIGFILE",
config_file?(char*)config_file:CLIXON_DEFAULT_CONFIG);
/* Find, read and parse configfile */
if (clicon_options_main(h) < 0)
return NULL;
return h;
}
/*! Deallocate everything from client_init
* @param[in] h Clixon handle
* @see clixon_client_init
*/
int
clixon_client_terminate(clicon_handle h)
{
clicon_debug(1, "%s", __FUNCTION__);
clicon_handle_exit(h);
return 0;
}
/*! Send a lock request (internal)
* @param[in] sock Open socket
* @param[in] lock 0: unlock, 1: lock
* @param[in] db Datastore name
* @retval 0 OK
* @retval -1 Error
*/
static int
clixon_client_lock(int sock,
const int lock,
const char *db)
{
int retval = -1;
cxobj *xret = NULL;
cxobj *xd;
cbuf *msg = NULL;
cbuf *msgret = NULL;
clicon_debug(1, "%s", __FUNCTION__);
if (db == NULL){
clicon_err(OE_XML, EINVAL, "Expected db");
goto done;
}
if ((msg = cbuf_new()) == NULL){
clicon_err(OE_PLUGIN, errno, "cbuf_new");
goto done;
}
if ((msgret = cbuf_new()) == NULL){
clicon_err(OE_PLUGIN, errno, "cbuf_new");
goto done;
}
cprintf(msg, "<rpc xmlns=\"%s\" %s>"
"<%slock><target><%s/></target></%slock></rpc>",
NETCONF_BASE_NAMESPACE,
NETCONF_MESSAGE_ID_ATTR,
lock?"":"un", db, lock?"":"un");
if (clicon_rpc1(sock, msg, msgret) < 0)
goto done;
if (clixon_xml_parse_string(cbuf_get(msgret), YB_NONE, NULL, &xret, NULL) < 0)
goto done;
if ((xd = xpath_first(xret, NULL, "/rpc-reply/rpc-error")) != NULL){
xd = xml_parent(xd); /* point to rpc-reply */
clixon_netconf_error(xd, "Get config", NULL);
goto done; /* Not fatal */
}
retval = 0;
done:
clicon_debug(1, "%s retval:%d", __FUNCTION__, retval);
if (xret)
xml_free(xret);
if (msg)
cbuf_free(msg);
if (msgret)
cbuf_free(msgret);
return retval;
}
/*! Internal function to construct the encoding and hello message
*
* @param[in] sock Socket
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @param[out] xdata XML data tree (may or may not include the intended data)
* @retval 0 OK
* @retval -1 Error
*/
static int
clixon_client_hello(int sock)
{
int retval = -1;
cbuf *msg = NULL;
clicon_debug(1, "%s", __FUNCTION__);
if ((msg = cbuf_new()) == NULL){
clicon_err(OE_PLUGIN, errno, "cbuf_new");
goto done;
}
cprintf(msg, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
cprintf(msg, "<hello xmlns=\"%s\">", NETCONF_BASE_NAMESPACE);
cprintf(msg, "<capabilities><capability>%s</capability></capabilities>", NETCONF_BASE_CAPABILITY_1_1);
cprintf(msg, "</hello>");
if (clicon_msg_send1(sock, msg) < 0)
goto done;
retval = 0;
done:
clicon_debug(1, "%s retval:%d", __FUNCTION__, retval);
if (msg)
cbuf_free(msg);
return retval;
}
/*! Connect client to clixon backend according to config and return a socket
* @param[in] h Clixon handle
* @param[in] socktype Type of socket, internal/external/netconf/ssh
* @retval ch Clixon session handler
* @retval NULL Error
* @see clixon_client_disconnect Close the socket returned here
*/
clixon_client_handle
clixon_client_connect(clicon_handle h,
clixon_client_type socktype)
{
struct clixon_client_handle *cch = NULL;
char **argv = NULL;
int nr;
int i;
char *netconf_bin = NULL;
struct stat st = {0,};
size_t sz = sizeof(struct clixon_client_handle);
char dbgstr[8];
clicon_debug(1, "%s", __FUNCTION__);
if ((cch = malloc(sz)) == NULL){
clicon_err(OE_NETCONF, errno, "malloc");
goto done;
}
memset(cch, 0, sz);
cch->cch_magic = CLIXON_CLIENT_MAGIC;
cch->cch_type = socktype;
switch (socktype){
case CLIXON_CLIENT_IPC:
if (clicon_rpc_connect(h, &cch->cch_socket) < 0)
goto err;
break;
case CLIXON_CLIENT_NETCONF:
nr = 7;
if (clicon_debug_get() != 0)
nr += 2;
if ((argv = calloc(nr, sizeof(char *))) == NULL){
clicon_err(OE_UNIX, errno, "calloc");
goto err;
}
i = 0;
if ((netconf_bin = getenv("CLIXON_NETCONF_BIN")) == NULL)
netconf_bin = CLIXON_NETCONF_BIN;
if (stat(netconf_bin, &st) < 0){
clicon_err(OE_NETCONF, errno, "netconf binary %s. Set with CLIXON_NETCONF_BIN=",
netconf_bin);
goto err;
}
argv[i++] = netconf_bin;
argv[i++] = "-q";
argv[i++] = "-f";
argv[i++] = clicon_option_str(h, "CLICON_CONFIGFILE");
argv[i++] = "-l"; /* log to syslog */
argv[i++] = "s";
if (clicon_debug_get() != 0){
argv[i++] = "-D";
snprintf(dbgstr, sizeof(dbgstr)-1, "%d", clicon_debug_get());
argv[i++] = dbgstr;
}
argv[i++] = NULL;
assert(i==nr);
if (clixon_proc_socket(argv, &cch->cch_pid, &cch->cch_socket) < 0){
goto err;
}
/* Start with encoding and hello message */
if (clixon_client_hello(cch->cch_socket) < 0)
goto err;
break;
case CLIXON_CLIENT_SSH:
break;
} /* switch */
/* lock */
if (clixon_client_lock(cch->cch_socket, 1, "running") < 0)
goto err;
cch->cch_locked = 1;
done:
clicon_debug(1, "%s retval:%p", __FUNCTION__, cch);
return cch;
err:
if (cch)
clixon_client_disconnect(cch);
cch = NULL;
goto done;
}
/*! Connect client to clixon backend according to config and return a socket
* @param[in] ch Clixon client session handle
* @see clixon_client_connect where the handle is created
* The handle is deallocated
*/
int
clixon_client_disconnect(clixon_client_handle ch)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
clicon_debug(1, "%s", __FUNCTION__);
if (cch == NULL){
clicon_err(OE_XML, EINVAL, "Expected cch handle");
goto done;
}
/* unlock (if locked) */
if (cch->cch_locked)
;// (void)clixon_client_lock(cch->cch_socket, 0, "running");
switch(cch->cch_type){
case CLIXON_CLIENT_IPC:
close(cch->cch_socket);
break;
case CLIXON_CLIENT_NETCONF:
if (clixon_proc_socket_close(cch->cch_pid,
cch->cch_socket) < 0)
goto done;
break;
case CLIXON_CLIENT_SSH:
break;
}
free(cch);
retval = 0;
done:
return retval;
}
/*! Get the bottom-most leaf in an xml tree being a result of xpath
* @param[in] xtop Pointer to XML top-of-tree
* @param[out] xbotp Pointer to XML bottom node
* @retval 0 OK
*/
static int
clixon_xml_bottom(cxobj *xtop,
cxobj **xbotp)
{
int retval = -1;
cxobj *x;
cxobj *xp;
cxobj *xc = NULL;
xp = xtop;
while (xp != NULL){
/* Find child, if many, one which is not a key, if any */
xc = NULL;
x = NULL;
while ((x = xml_child_each(xp, x, CX_ELMNT)) != NULL)
xc = x;
/* xc is last XXX */
if (xc == NULL)
break;
xp = xc;
}
retval = 0;
*xbotp = xp;
retval = 0;
// done:
return retval;
}
/*! Internal function to construct a get-config and query a value from the backend
*
* @param[in] sock Socket
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @param[out] xdata XML data tree (may or may not include the intended data)
* @retval 0 OK
* @retval -1 Error
*/
static int
clixon_client_get_xdata(int sock,
const char *namespace,
const char *xpath,
cxobj **xdata)
{
int retval = -1;
cxobj *xret = NULL;
cxobj *xd;
cbuf *msg = NULL;
cbuf *msgret = NULL;
const char *db = "running";
cvec *nsc = NULL;
clicon_debug(1, "%s", __FUNCTION__);
if ((msg = cbuf_new()) == NULL){
clicon_err(OE_PLUGIN, errno, "cbuf_new");
goto done;
}
if ((msgret = cbuf_new()) == NULL){
clicon_err(OE_PLUGIN, errno, "cbuf_new");
goto done;
}
cprintf(msg, "<rpc xmlns=\"%s\"", NETCONF_BASE_NAMESPACE);
cprintf(msg, " xmlns:%s=\"%s\"",
NETCONF_BASE_PREFIX, NETCONF_BASE_NAMESPACE);
cprintf(msg, " %s", NETCONF_MESSAGE_ID_ATTR);
cprintf(msg, "><get-config><source><%s/></source>", db);
if (xpath && strlen(xpath)){
cprintf(msg, "<%s:filter %s:type=\"xpath\" xmlns=\"%s\" %s:select=\"%s\"",
NETCONF_BASE_PREFIX,
NETCONF_BASE_PREFIX,
namespace,
NETCONF_BASE_PREFIX,
xpath);
if (xml_nsctx_cbuf(msg, nsc) < 0)
goto done;
cprintf(msg, "/>");
}
cprintf(msg, "</get-config></rpc>");
if (clicon_rpc1(sock, msg, msgret) < 0)
goto done;
if (clixon_xml_parse_string(cbuf_get(msgret), YB_NONE, NULL, &xret, NULL) < 0)
goto done;
if ((xd = xpath_first(xret, NULL, "/rpc-reply/rpc-error")) != NULL){
xd = xml_parent(xd); /* point to rpc-reply */
clixon_netconf_error(xd, "Get config", NULL);
goto done; /* Not fatal */
}
else if ((xd = xpath_first(xret, NULL, "/rpc-reply/data")) == NULL){
if ((xd = xml_new(NETCONF_OUTPUT_DATA, NULL, CX_ELMNT)) == NULL)
goto done;
}
else{
if (xml_rm(xd) < 0)
goto done;
}
*xdata = xd;
retval = 0;
done:
clicon_debug(1, "%s retval:%d", __FUNCTION__, retval);
if (xret)
xml_free(xret);
if (msg)
cbuf_free(msg);
if (msgret)
cbuf_free(msgret);
return retval;
}
/*! Generic get value of body
* @param[in] sock Open socket
* @param[in] namespace Default namespace used for non-prefixed entries in xpath.
* @param[in] xpath XPath
* @param[out] val Output value
* @retval 0 OK
* @retval -1 Error
*/
static int
clixon_client_get_body_val(int sock,
const char *namespace,
const char *xpath,
char **val)
{
int retval = -1;
cxobj *xdata = NULL;
cxobj *xobj = NULL;
clicon_debug(1, "%s", __FUNCTION__);
if (val == NULL){
clicon_err(OE_XML, EINVAL, "Expected val");
goto done;
}
if (clixon_client_get_xdata(sock, namespace, xpath, &xdata) < 0)
goto done;
if (xdata == NULL){
clicon_err(OE_XML, EINVAL, "No xml obj found");
goto done;
}
/* Is this an error, maybe an "unset" retval ? */
if (xml_child_nr_type(xdata, CX_ELMNT) == 0){
clicon_err(OE_XML, EINVAL, "Value not found");
goto done;
}
if (clixon_xml_bottom(xdata, &xobj) < 0)
goto done;
if (xobj == NULL){
clicon_err(OE_XML, EINVAL, "No xml value found");
goto done;
}
*val = xml_body(xobj);
retval = 0;
done:
clicon_debug(1, "%s retval:%d", __FUNCTION__, retval);
return retval;
}
/*! Client-api get boolean
* @param[in] ch Clixon client handle
* @param[out] rval Return value
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @retval 0 OK
* @retval -1 Error
*/
int
clixon_client_get_bool(clixon_client_handle ch,
int *rval,
const char *namespace,
const char *xpath)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
char *val = NULL;
char *reason = NULL;
int ret;
uint8_t val0=0;
clicon_debug(1, "%s", __FUNCTION__);
if (clixon_client_get_body_val(cch->cch_socket,
namespace, xpath, &val) < 0)
goto done;
if ((ret = parse_bool(val, &val0, &reason)) < 0){
clicon_err(OE_XML, errno, "parse_bool");
goto done;
}
if (ret == 0){
clicon_err(OE_XML, EINVAL, "%s", reason);
goto done;
}
*rval = (int)val0;
retval = 0;
done:
if (reason)
free(reason);
return retval;
}
/*! Client-api get string
* @param[in] ch Clixon client handle
* @param[out] rval Return value string
* @param[in] n Length of string
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @retval 0 OK
* @retval -1 Error
*/
int
clixon_client_get_str(clixon_client_handle ch,
char *rval,
int n,
const char *namespace,
const char *xpath)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
char *val = NULL;
clicon_debug(1, "%s", __FUNCTION__);
if (clixon_client_get_body_val(cch->cch_socket,
namespace, xpath, &val) < 0)
goto done;
strncpy(rval, val, n-1);
rval[n-1]= '\0';
retval = 0;
done:
return retval;
}
/*! Client-api get uint8
* @param[in] ch Clixon client handle
* @param[out] rval Return value
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @retval 0 OK
* @retval -1 Error
*/
int
clixon_client_get_uint8(clixon_client_handle ch,
uint8_t *rval,
const char *namespace,
const char *xpath)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
char *val = NULL;
char *reason = NULL;
int ret;
clicon_debug(1, "%s", __FUNCTION__);
if (clixon_client_get_body_val(cch->cch_socket,
namespace, xpath, &val) < 0)
goto done;
if ((ret = parse_uint8(val, rval, &reason)) < 0){
clicon_err(OE_XML, errno, "parse_bool");
goto done;
}
if (ret == 0){
clicon_err(OE_XML, EINVAL, "%s", reason);
goto done;
}
retval = 0;
done:
if (reason)
free(reason);
return retval;
}
/*! Client-api get uint16
* @param[in] ch Clixon client handle
* @param[out] rval Return value
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @retval 0 OK
* @retval -1 Error
*/
int
clixon_client_get_uint16(clixon_client_handle ch,
uint16_t *rval,
const char *namespace,
const char *xpath)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
char *val = NULL;
char *reason = NULL;
int ret;
clicon_debug(1, "%s", __FUNCTION__);
if (clixon_client_get_body_val(cch->cch_socket,
namespace, xpath, &val) < 0)
goto done;
if ((ret = parse_uint16(val, rval, &reason)) < 0){
clicon_err(OE_XML, errno, "parse_bool");
goto done;
}
if (ret == 0){
clicon_err(OE_XML, EINVAL, "%s", reason);
goto done;
}
retval = 0;
done:
if (reason)
free(reason);
return retval;
}
/*! Client-api get uint32
* @param[in] ch Clixon client handle
* @param[out] rval Return value
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @retval 0 OK
* @retval -1 Error
*/
int
clixon_client_get_uint32(clixon_client_handle ch,
uint32_t *rval,
const char *namespace,
const char *xpath)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
char *val = NULL;
char *reason = NULL;
int ret;
clicon_debug(1, "%s", __FUNCTION__);
if (clixon_client_get_body_val(cch->cch_socket,
namespace, xpath, &val) < 0)
goto done;
if (val == NULL){
clicon_err(OE_XML, EFAULT, "val is NULL");
goto done;
}
if ((ret = parse_uint32(val, rval, &reason)) < 0){
clicon_err(OE_XML, errno, "parse_bool");
goto done;
}
if (ret == 0){
clicon_err(OE_XML, EINVAL, "%s", reason);
goto done;
}
retval = 0;
done:
clicon_debug(1, "%s retval:%d", __FUNCTION__, retval);
if (reason)
free(reason);
return retval;
}
/*! Client-api get uint64
* @param[in] ch Clixon client handle
* @param[out] rval Return value
* @param[in] namespace Default namespace used for non-prefixed entries in xpath. (Alt use nsc)
* @param[in] xpath XPath
* @retval 0 OK
* @retval -1 Error
*/
int
clixon_client_get_uint64(clixon_client_handle ch,
uint64_t *rval,
const char *namespace,
const char *xpath)
{
int retval = -1;
struct clixon_client_handle *cch = chandle(ch);
char *val = NULL;
char *reason = NULL;
int ret;
clicon_debug(1, "%s", __FUNCTION__);
if (clixon_client_get_body_val(cch->cch_socket,
namespace, xpath, &val) < 0)
goto done;
if ((ret = parse_uint64(val, rval, &reason)) < 0){
clicon_err(OE_XML, errno, "parse_bool");
goto done;
}
if (ret == 0){
clicon_err(OE_XML, EINVAL, "%s", reason);
goto done;
}
retval = 0;
done:
if (reason)
free(reason);
return retval;
}
/* Access functions */
/*! Client-api get uint64
* @param[in] ch Clixon client handle
* @retval s Open socket
* @retval -1 No/closed socket
*/
int
clixon_client_socket_get(clixon_client_handle ch)
{
struct clixon_client_handle *cch = chandle(ch);
return cch->cch_socket;
}
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