本文主要是介绍quagga中cli命令分析,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
在已有的命令视图中新增加命令
定义命令并处理
- 定义命令,
DEFUN(处理函数,命令名称,命令字符串,帮助信息)
#define DEFUN(funcname, cmdname, cmdstr, helpstr) \DEFUN_CMD_FUNC_DECL(funcname) \DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, 0, 0) \DEFUN_CMD_FUNC_TEXT(funcname)
DEFUN (vpnv4_route_target_import,vpnv4_route_target_import_cmd,"rt-import ASN:nn","Route target import\n""ASN:nn, e.g., 100:1\n")
{return bgp_vpn_rt_import (SAFI_MPLS_VPN, vty, argv[0]);
}
处理函数声明:
Static int bgp_vpn_rt_import (safi_t safi, struct vty *vty, const char *rt_str);
- 处理函数实现;
intbgp_vpn_rt_import (safi_t safi, struct vty *vty,const char *rt_str)
{return CMD_SUCCESS;
}
- 安装该命令到对应的命令视图下,
Install_element(命令视图,命令名称)
void
bgp_mplsvpn_init (void)
{install_element (BGP_VPNV4_NODE, &vpnv4_network_cmd);install_element (BGP_VPNV4_NODE, &vpnv4_network_route_map_cmd);install_element (BGP_VPNV4_NODE, &vpnv4_route_target_import_cmd);install_element (BGP_VPNV4_NODE, &vpnv4_route_target_export_cmd);...
}
show running显示命令
- show running读取命令的位置
/* Write current configuration into the terminal. */
ALIAS (config_write_terminal,show_running_config_cmd,"show running-config",SHOW_STR"running configuration\n")
可以看到show running使用的是config_write_terminal这个函数体,它的实现在:
/* Write current configuration into the terminal. */
DEFUN (config_write_terminal,config_write_terminal_cmd,"write terminal","Write running configuration to memory, network, or terminal\n""Write to terminal\n")
{unsigned int i;struct cmd_node *node;if (vty->type == VTY_SHELL_SERV){for (i = 0; i < vector_active (cmdvec); i++)if ((node = vector_slot (cmdvec, i)) && node->func && node->vtysh){if ((*node->func) (vty))vty_out (vty, "!%s", VTY_NEWLINE);}}else{vty_out (vty, "%sCurrent configuration:%s", VTY_NEWLINE,VTY_NEWLINE);vty_out (vty, "!%s", VTY_NEWLINE);for (i = 0; i < vector_active (cmdvec); i++)if ((node = vector_slot (cmdvec, i)) && node->func){if ((*node->func) (vty))vty_out (vty, "!%s", VTY_NEWLINE);}vty_out (vty, "end%s",VTY_NEWLINE);}return CMD_SUCCESS;
}
执行show running时调用了node->func函数,install_node时会给node->func赋值:
/* Install top node of command vector. */
void
install_node (struct cmd_node *node, int (*func) (struct vty *))
{vector_set_index (cmdvec, node->node, node);node->func = func;node->cmd_vector = vector_init (VECTOR_MIN_SIZE);
}
只要func不为null,调用show running就会执行此函数。以BGP为例,install_node定义的位置如下:
void
bgp_vty_init (void)
{/* Install bgp top node. */install_node (&bgp_node, bgp_config_write);install_node (&bgp_ipv4_unicast_node, NULL);install_node (&bgp_ipv4_multicast_node, NULL);install_node (&bgp_ipv6_unicast_node, NULL);install_node (&bgp_ipv6_multicast_node, NULL);install_node (&bgp_vpnv4_node, NULL);install_node (&bgp_vpnv6_node, NULL);install_node (&bgp_encap_node, NULL);install_node (&bgp_encapv6_node, NULL);/* Install default VTY commands to new nodes. */install_default (BGP_NODE);install_default (BGP_IPV4_NODE);...}
可以看到执行的是bgp_config_write函数,可以把需要显示的命令及数值添加到函数里,以配置的bgp vpn rt为例,需要在对应的node视图下添加:
vty_out (vty, " rt-export %s", rt_export_buf);vty_out (vty, "%s", VTY_NEWLINE);
在quagga的基础上新增加命令视图(转)
- 定义命令视图类型,enum node_type ;
- 定义命令视图结构,struct cmd_node;
Static struct cmd_node 视图名称={
命令视图类型,
该视图下的提示符字符串,
}; - 安装命令视图,install_node(),install_default();
Install_node(视图名称,回调函数)
Install_default(视图类型)
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