netopeer2开发(一)

netopeer网络管理浅析简单介绍了基于netconf协议的netopeer项目是如何对实际设备进行管理的，基于对netopeer的学习，本节着手于对第二代netopeer2的研究，主要介绍netopeer2如何对实际设备进行管理，首先介绍如何读取当前linux系统的端口配置信息，实现类似于netopeer/transAPI/cfginterfaces/cfginterfaces-init的功能。

sysrepo简单使用中介绍了可以使用两种方式访问sysrepo数据库：独立进程形式和插件形式。

独立进程形式

使用独立进程形式可以更好地进行打印输出，调试代码，以方便项目开发。

首先在sysrepo/examples/plugin目录下，创建一个sr_interfaces.c文件，main函数中创建与sysrepo的连接，并开启一个会话，然后利用开启的会话，读取linux系统端口信息，并将端口信息注册到sysrepo数据库，具体如下：

int
main(int argc, char **argv)
{sr_conn_ctx_t *connection = NULL;sr_session_ctx_t *session = NULL;int rc = SR_ERR_OK;unsigned int dev_count;char **devices, *msg = NULL;int i;/* turn logging on */sr_log_stderr(SR_LL_WRN);/* connect to sysrepo */rc = sr_connect(0, &connection);if (rc != SR_ERR_OK) {goto cleanup;}/* start session */rc = sr_session_start(connection, SR_DS_RUNNING, &session);if (rc != SR_ERR_OK) {goto cleanup;}/* 获取linux系统端口*/devices = iface_get_ifcs(1, &dev_count, &msg);if(devices == NULL){goto cleanup;}for(i = 0; i < dev_count; i++){/* 解析端口信息，parse_iface_config函数的具体实现如下所示 */rc = parse_iface_config(session, devices[i], &msg);free(devices[i]);if(msg != NULL){free(msg);msg = NULL;}}free(devices);/* apply the change */rc = sr_apply_changes(session, 0, 0);if (rc != SR_ERR_OK) {goto cleanup;}cleanup:sr_disconnect(connection);return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}

parse_iface_config函数的具体实现如下：

int parse_iface_config(sr_session_ctx_t *session, const char if_name, char **msg)
{int i, j, rc, len;unsigned int ipv4_enabled;char *tmp, *tmp2;struct ip_addrs ips;char xpath0[128], xpath[128], xpath_ip[128];char ianaift[64] = "iana-if-type:";char ipaddr[64];ips.count = 0;strcpy(xpath0, "/ietf-interfaces:interfaces/interface[name='");strcat(xpath0, if_name);strcat(xpath0, "']");printf("xpath0: %s\n", xpath0);/* 设置一个interface节点，节点的name值为if_name指针指向的值 */rc = sr_set_item_str(session, xpath0, NULL, NULL, SR_EDIT_DEFAULT);if(if_name < (char*)2 || (tmp2 = iface_get_type(if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/type");strcat(ianaift, tmp2);rc = sr_set_item_str(session, xpath, ianaift, NULL, SR_EDIT_DEFAULT);free(tmp2);if((tmp = iface_get_enabled(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/enabled");rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);free(tmp);/* IPv4 */if((j = iface_get_ipv4_presence(1, if_name, msg)) == -1){return -1;}if(j){if((tmp = iface_get_ipv4_enabled(if_name, msg)) == NULL){return -1;}if(strcmp(tmp, "true") == 0){ipv4_enabled = 1;}else{ipv4_enabled = 0;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv4/enabled");rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);free(tmp);if((tmp = iface_get_ipv4_forwarding(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv4/forwarding");rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);free(tmp);if((tmp = iface_get_ipv4_mtu(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv4/mtu");if(atoi(tmp) < 65536){rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);}free(tmp);if(ipv4_enabled){if(iface_get_ipv4_ipaddrs(1, if_name, &ips, msg) != 0){return -1;}for(j = 0; j < ips.count; ++j){len = strlen(ips.ip[j]);memcpy(ipaddr, ips.ip[j], len);ipaddr[len] = '\0';/* ipv4下添加一个address节点，节点的key属性ip的值为ipaddr */memcpy(xpath_ip, xpath0, sizeof(xpath0));strcat(xpath_ip, "/ietf-ip:ipv4/address[ip='");strcat(xpath_ip, ipaddr);strcat(xpath_ip, "']");rc = sr_set_item_str(session, xpath_ip, NULL, NULL, SR_EDIT_DEFAULT);printf("xpath_ip: %s\n", xpath_ip);memcpy(xpath, xpath_ip, sizeof(xpath_ip));strcat(xpath, "/prefix-length");rc = sr_set_item_str(session, xpath, ips.prefix_or_mac[j], NULL, SR_EDIT_DEFAULT);printf("xpath: %s\n", xpath);free(ips.ip[j]);free(ips.prefix_or_mac[j]);}if(ips.count != 0){free(ips.ip);free(ips.prefix_or_mac);ips.count = 0;}}}/* IPv6 */if((j = iface_get_ipv6_presence(1, if_name, msg)) == -1){return -1;}if(j){memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv6/enabled");rc = sr_set_item_str(session, xpath, "true", NULL, SR_EDIT_DEFAULT);if((tmp = iface_get_ipv6_forwarding(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv6/forwarding");rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);free(tmp);if((tmp = iface_get_ipv6_mtu(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv6/mtu");if(strcmp("65535", tmp) < 0){printf("mtu is too high");}else{rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);}free(tmp);if(iface_get_ipv6_ipaddrs(1, if_name, &ips, msg) != 0){return -1;}for(j = 0; j < ips.count; ++j){len = strlen(ips.ip[j]);memcpy(ipaddr, ips.ip[j], len);ipaddr[len] = '\0';memcpy(xpath_ip, xpath0, sizeof(xpath0));strcat(xpath_ip, "/ietf-ip:ipv6/address[ip='");strcat(xpath_ip, ipaddr);strcat(xpath_ip, "']");rc = sr_set_item_str(session, xpath_ip, NULL, NULL, SR_EDIT_DEFAULT);printf("xpath_ip: %s\n", xpath_ip);memcpy(xpath, xpath_ip, sizeof(xpath_ip));strcat(xpath, "/prefix-length");rc = sr_set_item_str(session, xpath, ips.prefix_or_mac[j], NULL, SR_EDIT_DEFAULT);free(ips.ip[j]);free(ips.prefix_or_mac[j]);}if(ips.count != 0){free(ips.ip);free(ips.prefix_or_mac);ips.count = 0;}if(iface_get_ipv6_neighs(1, if_name, &ips, msg) != 0){return -1;}for(j = 0; j < ips.count; ++j){len = strlen(ips.ip[j]);memcpy(ipaddr, ips.ip[j], len);ipaddr[len] = '\0';memcpy(xpath_ip, xpath0, sizeof(xpath0));strcat(xpath_ip, "/ietf-ip:ipv6/neighbor[ip='");strcat(xpath_ip, ipaddr);strcat(xpath_ip, "']");rc = sr_set_item_str(session, xpath_ip, NULL, NULL, SR_EDIT_DEFAULT);memcpy(xpath, xpath_ip, sizeof(xpath_ip));strcat(xpath, "/link-layer-address");rc = sr_set_item_str(session, xpath, ips.prefix_or_mac[j], NULL, SR_EDIT_DEFAULT);free(ips.ip[j]);free(ips.prefix_or_mac[j]);}if(ips.count != 0){free(ips.ip);free(ips.prefix_or_mac);ips.count = 0;}if((tmp = iface_get_ipv6_dup_addr_det(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv6/dup-addr-detect-transmits");rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);free(tmp);if((tmp = iface_get_ipv6_creat_glob_addr(1, if_name, msg)) == NULL){return -1;}memcpy(xpath, xpath0, sizeof(xpath0));strcat(xpath, "/ietf-ip:ipv6/autoconf/create-global-address");rc = sr_set_item_str(session, xpath, tmp, NULL, SR_EDIT_DEFAULT);free(tmp);}return 0;
}

上述函数中用到的诸如iface_***函数均借鉴自netopeer/transAPI/cfginterfaces/目录下的iface_if.c中定义的函数，主要完成读取设备端口相关信息。

编译自己新增的函数方法为：在sysrepo/examples目录下的CMakeLists.txt文件中添加自己的函数，如：

add_executable(ietf-interfaces plugin/iface_if.c plugin/sr_interfaces.c)
target_link_libraries(ietf-interfaces sysrepo)

然后重新cmake .. && make，就会在sysrepo/build/examples目录下生成可执行程序。然后就可以运行自己的程序了。

在sysrepo/build/examples目录下执行：

[root@localhost examples]# ./application_changes_example ietf-interfaces

Application will watch for changes in "ietf-interfaces".========== READING RUNNING CONFIG: ==========/ietf-interfaces:interfaces (container)========== LISTENING FOR CHANGES ==========

可以看到，当前状态下没有任何信息。另启一个终端，执行命令

[root@localhost examples]# ./ietf-interfaces

xpath0: /ietf-interfaces:interfaces/interface[name='ens32']
xpath0: /ietf-interfaces:interfaces/interface[name='lo']
xpath_ip: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']
xpath: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/prefix-length

终端打印输出是parse_iface_config函数中printf()函数的输出。

在监听端可以看到如下打印信息：

[root@localhost examples]# ./application_changes_example ietf-interfaces
Application will watch for changes in "ietf-interfaces".
[WRN]: Removing event pipe "sr_evpipe16" after a crashed subscription.========== READING RUNNING CONFIG: ==========/ietf-interfaces:interfaces (container)========== LISTENING FOR CHANGES ==================== EVENT change CHANGES: ====================================CREATED: /ietf-interfaces:interfaces/interface[name='ens32'] (list instance)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/name = ens32
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/type = iana-if-type:ethernetCsmacd
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/enabled = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/enabled = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/mtu = 1500
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/mtu = 1500
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/dup-addr-detect-transmits = 1
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/autoconf (container)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/autoconf/create-global-addresses = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo'] (list instance)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/name = lo
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/type = iana-if-type:softwareLoopback
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1'] (list instance)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/ip = 127.0.0.1
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/prefix-length = 8
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/dup-addr-detect-transmits = 1
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/autoconf (container)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/autoconf/create-global-addresses = true========== END OF CHANGES ================================================= EVENT done CHANGES: ====================================CREATED: /ietf-interfaces:interfaces/interface[name='ens32'] (list instance)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/name = ens32
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/type = iana-if-type:ethernetCsmacd
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/enabled = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/enabled = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/mtu = 1500
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/mtu = 1500
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/dup-addr-detect-transmits = 1
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/autoconf (container)
CREATED: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/autoconf/create-global-addresses = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo'] (list instance)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/name = lo
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/type = iana-if-type:softwareLoopback
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1'] (list instance)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/ip = 127.0.0.1
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/prefix-length = 8
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6 (container)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/enabled = true
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/forwarding = false
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/dup-addr-detect-transmits = 1
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/autoconf (container)
CREATED: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/autoconf/create-global-addresses = true========== END OF CHANGES ================================================= CONFIG HAS CHANGED, CURRENT RUNNING CONFIG: ==========/ietf-interfaces:interfaces (container)
/ietf-interfaces:interfaces/interface[name='ens32'] (list instance)
/ietf-interfaces:interfaces/interface[name='ens32']/name = ens32
/ietf-interfaces:interfaces/interface[name='ens32']/type = iana-if-type:ethernetCsmacd
/ietf-interfaces:interfaces/interface[name='ens32']/enabled = false
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4 (container)
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/enabled = false
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/forwarding = false
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/mtu = 1500
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6 (container)
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/enabled = true
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/forwarding = false
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/mtu = 1500
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/dup-addr-detect-transmits = 1
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/autoconf (container)
/ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv6/autoconf/create-global-addresses = true
/ietf-interfaces:interfaces/interface[name='lo'] (list instance)
/ietf-interfaces:interfaces/interface[name='lo']/name = lo
/ietf-interfaces:interfaces/interface[name='lo']/type = iana-if-type:softwareLoopback
/ietf-interfaces:interfaces/interface[name='lo']/enabled = true
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4 (container)
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/enabled = true
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/forwarding = false
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1'] (list instance)
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/ip = 127.0.0.1
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/prefix-length = 8
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6 (container)
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/enabled = true
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/forwarding = false
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/dup-addr-detect-transmits = 1
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/autoconf (container)
/ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv6/autoconf/create-global-addresses = true

可以看到，当前配置信息已经发生了改变，正确读取到系统端口配置信息。

此时，如果启动netopeer2-server和netopeer2-cli后，可以通过netopeer2-cli客户端看到相应端口信息。

插件形式

sysrepo插件就是一个共享库文件，必须提供两个接口：sr_plugin_init_cb() 和 sr_plugin_cleanup_cb()。设备的初始化数据必须在sr_plugin_init_cb()接口中实现，将编译好的.so文件放入sysrepo插件路径下，其安装路径在cmake的时候指定，如下所示：

[root@bogon build]# cmake ..

-- ietf-yang-library revision: 2019-01-04
-- Sysrepo repository: /home/renzg/netopeer2/libnetconf2/sysrepo-master/build/repository
-- Startup data path:  /home/renzg/netopeer2/libnetconf2/sysrepo-master/build/repository/data
-- Notification path:  /home/renzg/netopeer2/libnetconf2/sysrepo-master/build/repository/data/notif
-- YANG module path:   /home/renzg/netopeer2/libnetconf2/sysrepo-master/build/repository/yang
-- SRPD plugins path:  /usr/local/lib64/sysrepo/plugins
-- Missing tools (devscripts, debhelper package) for building DEB package.
-- To build local RPM package, use "build-rpm" target.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/renzg/netopeer2/libnetconf2/sysrepo-master/build

/usr/local/lib64/sysrepo/plugins即为sysrepo插件路径。

插件形式实现读取设备初始数据的代码如下：

int sr_plugin_init_cb(sr_session_ctx_t *session, void **private_data)
{int rc;(void)private_data;unsigned int dev_count;char** devices, *msg = NULL;int i;/* remember the session of our plugin */sess = session;devices = iface_get_ifcs(1, &dev_count, &msg);if (devices == NULL) {goto error;}for(i = 0; i < dev_count; i++){rc = parse_iface_config(session, devices[i], &msg);free(devices[i]);if(msg != NULL){free(msg);msg = NULL;}}free(devices);/* apply the change */rc = sr_apply_changes(session, 0, 0);if (rc != SR_ERR_OK) {goto error;}printf("sr_apply_changes end\n");/* sysrepo/plugins.h provides an interface for logging */SRP_LOG_DBGMSG("OVEN: Oven plugin initialized successfully.");return SR_ERR_OK;error:SRP_LOG_ERR("OVEN: Oven plugin initialization failed: %s.", sr_strerror(rc));sr_unsubscribe(subscription);return rc;
}void
sr_plugin_cleanup_cb(sr_session_ctx_t *session, void *private_data)
{(void)session;(void)private_data;/* nothing to cleanup except freeing the subscriptions */sr_unsubscribe(subscription);SRP_LOG_DBGMSG("OVEN: Oven plugin cleanup finished.");
}

然后在sysrepo/examples/CMakeLists.txt文件中添加自己的.c文件

# ietf-interfaces plugin
add_library(ietf-interfaces MODULE plugin/iface_if.c plugin/interfaces.c)
set_target_properties(ietf-interfaces PROPERTIES PREFIX "")
target_link_libraries(ietf-interfaces sysrepo)

编译sysrepo源码，会在exampls文件夹下生成ietf-interfaces.so文件，将该文件复制到/usr/local/lib64/sysrepo/plugins目录下，执行sysrepo-plugind即可，如下所示：

[root@bogon build]# sysrepo-plugind -v3 -d

[INF]: Applying scheduled changes.
[INF]: No scheduled changes.
[INF]: Session 5 (user "root") created.
xpath0: /ietf-interfaces:interfaces/interface[name='ens32']
xpath: /ietf-interfaces:interfaces/interface[name='ens32']/type, ianaift: iana-if-type:ethernetCsmacd
xpath: /ietf-interfaces:interfaces/interface[name='ens32']/enabled
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.10']
xpath: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.10']/prefix-length
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.10']
xpath: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.10']/prefix-length
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.15']
xpath: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.15']/prefix-length
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.15']
xpath: /ietf-interfaces:interfaces/interface[name='ens32']/ietf-ip:ipv4/address[ip='192.168.32.15']/prefix-length
xpath0: /ietf-interfaces:interfaces/interface[name='ens34']
xpath: /ietf-interfaces:interfaces/interface[name='ens34']/type, ianaift: iana-if-type:ethernetCsmacd
xpath: /ietf-interfaces:interfaces/interface[name='ens34']/enabled
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens34']/ietf-ip:ipv4/address[ip='192.168.34.15']
xpath: /ietf-interfaces:interfaces/interface[name='ens34']/ietf-ip:ipv4/address[ip='192.168.34.15']/prefix-length
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens34']/ietf-ip:ipv4/address[ip='192.168.34.15']
xpath: /ietf-interfaces:interfaces/interface[name='ens34']/ietf-ip:ipv4/address[ip='192.168.34.15']/prefix-length
xpath_ip: /ietf-interfaces:interfaces/interface[name='ens34']/ietf-ip:ipv4/address[ip='192.168.34.10']
xpath: /ietf-interfaces:interfaces/interface[name='ens34']/ietf-ip:ipv4/address[ip='192.168.34.10']/prefix-length
xpath0: /ietf-interfaces:interfaces/interface[name='lo']
xpath: /ietf-interfaces:interfaces/interface[name='lo']/type, ianaift: iana-if-type:softwareLoopback
xpath:/ietf-interfaces:interfaces/interface[name='lo']/enabled
xpath_ip: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']
xpath: /ietf-interfaces:interfaces/interface[name='lo']/ietf-ip:ipv4/address[ip='127.0.0.1']/prefix-length
[INF]: No datastore changes to apply.
sr_apply_changes end

可以看到两种方式得到的结果是相同的。

完毕！