ip addr set

时间: 2025-07-04 11:13:23 AIGC 浏览: 26
在 Linux 系统中,`ip addr` 命令是 `iproute2` 工具包的一部分,用于管理和配置网络接口的 IP 地址。通过 `ip addr` 可以灵活地添加、删除和修改接口的 IPv4 或 IPv6 地址。 ### 配置网络接口的 IP 地址 #### 1. 查看当前网络接口信息 可以使用以下命令查看当前系统中所有网络接口的状态: ```bash ip addr show ``` 该命令会列出所有网络接口及其当前配置的 IP 地址等信息。 #### 2. 添加 IP 地址 要为某个网络接口(例如 `eth0`)添加一个 IPv4 地址,可以使用如下命令: ```bash sudo ip addr add 192.168.1.100/24 dev eth0 ``` 其中: - `192.168.1.100` 是指定的 IP 地址; - `/24` 表示子网掩码为 `255.255.255.0`; - `dev eth0` 指定操作的网络接口为 `eth0`。 #### 3. 删除 IP 地址 如果需要删除某个接口上的 IP 地址,可以使用以下命令: ```bash sudo ip addr del 192.168.1.100/24 dev eth0 ``` 该命令将从 `eth0` 接口上移除 `192.168.1.100/24` 的地址配置。 #### 4. 启用或禁用网络接口 在完成 IP 地址配置后,可能需要启用或禁用特定的网络接口。可以使用以下命令来控制接口状态: - **启用接口**: ```bash sudo ip link set eth0 up ``` - **禁用接口**: ```bash sudo ip link set eth0 down ``` #### 5. 持久化配置 虽然上述命令可以临时更改网络接口的 IP 地址,但这些更改不会在系统重启后保留。为了确保配置持久生效,需要将设置写入系统的网络配置文件中。在大多数基于 systemd 的发行版中,可以通过编辑 `/etc/network/interfaces` 文件或者使用 `NetworkManager` 来实现永久性配置。 例如,在 Debian/Ubuntu 系统中,可以编辑 `/etc/network/interfaces` 文件,并添加如下内容: ```bash auto eth0 iface eth0 inet static address 192.168.1.100 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 8.8.8.8 ``` 保存并重启网络服务后,新的配置将在每次启动时自动应用。 #### 6. 注意事项 - 使用 `ip addr` 命令进行的配置是临时性的,重启后将失效。 - 在执行 `ip addr` 相关命令时,通常需要管理员权限,因此建议使用 `sudo` 执行。 - 如果系统支持 IPv6,也可以通过类似的命令配置 IPv6 地址,例如:`ip addr add 2001:db8::1/64 dev eth0`[^1]。 ---
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/* dhcps.c * * udhcp Server * Copyright (C) 1999 Matthew Ramsay <[email protected]> * Chris Trew <[email protected]> * * Rewrite by Russ Dill <[email protected]> July 2001 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <netinet/if_ether.h> #include #include #include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include "options.h" #include "packet.h" #include "dhcp.h" #include "dhcps.h" #include "libds.h" /* DHCPS模块中各个参数项单位都改为秒 */ #define LEASE_TIME_MAX (48*60*60) /* 租期最长2天 */ #define LEASE_TIME_MIN (1*60) /* 租期最短一分钟 */ #define LEASE_OFFER_TIME (2*60*60) #define DECLINE_TIME (60*60) #define CONFLICT_TIME (60*60) #define DHCP_CHANGE_RECEIVE_PORT 52261 #define DHCP_CHANGE_SEND_PORT 52262 #define DEFAULT_DHCPS_IP "192.168.191.1" #define DEFAULT_DHCPS_MASK "255.255.255.0" #define DEF_DHCPS_IP_BEGIN "192.168.191.120" #define DEF_DHCPS_IP_END "192.168.191.199" #define DHCPS_HOST_NAME_LEN 32 #define DHCPS_OPTION_AUTO "auto" #define DHCPS_OPTION_ENABLE "enable" #define DHCPS_OPTION_POOLSTART "pool_start" #define DHCPS_OPTION_POOLEND "pool_end" #define DHCPS_OPTION_LEASETIME "lease_time" #define DHCPS_OPTION_GATEWAY "gateway" #define DHCPS_OPTION_PRIDNS "pri_dns" #define DHCPS_OPTION_SNDDNS "snd_dns" #define DHCPS_OPTION_IP "ip" #define DHCPS_OPTION_MAC "mac" #define DHCPS_OPTION_EXPIRES "expires" #define DHCPS_OPTION_HOSTNAME "hostname" DHCPS_PARAMS dhcps_params; LOCAL struct dhcp_packet recv_dhcp_packet; LOCAL struct dhcp_packet packet; #define DHCPS_MALLOC(size) malloc(size) #define DHCPS_FREE(addr) free((UINT8*)(addr)) #define ISNOTSAMESUBNET(ip1, ip2, mask) (0 != (((ip1) ^ (ip2)) & (mask))) /* 是否4G IPC - 4G上网模式 */ LOCAL U16 get_lte_enabled(void) { LTE_CAPABILITY lte_cap = {0}; LTE_CONFIG_INFO_DATA lte_config = {0}; if (0 == ds_read(LTE_CAPABILITY_PATH, (U8 *)<e_cap, sizeof(lte_cap))) { //未定义lte_capability,判断为非4G IPC,未开启4G上网模式 return 0; } if (0 == ds_read(LTE_INFO_DATA_PATH, (U8 *)<e_config, sizeof(lte_config))) { //4G IPC默认4G上网模式,获取失败时按照4G上网处理 return 1; } return !(lte_cap.internet_wired_support && lte_config.internet_wired_enable); } /* clear every lease out that chaddr OR yiaddr matches and is nonzero */ LOCAL void clear_lease(U8 *mac, U32 ip, DHCPS_LEASE *leases) { S32 i, j, k; for (j = 0; j < CHADDR_LEN && !mac[j]; j++); for (i = 0; i < DHCPS_LEASE_LIST_SIZE; i++) { if ((j != CHADDR_LEN && !memcmp(leases[i].mac, mac, 6)) || (ip && leases[i].ip == ip)) { memset(&(leases[i]), 0, sizeof(leases[i])); for (k = i;(k + 1) < DHCPS_LEASE_LIST_SIZE; k++) { memcpy(&(leases[k]), &(leases[k + 1]), sizeof(leases[k])); memset(&(leases[k + 1]), 0, sizeof(leases[k + 1])); } i--; } } } /* Find the oldest expired lease, NULL if there are no expired leases */ LOCAL S32 oldest_expired_lease(DHCPS_LEASE *leases) { U32 i; for (i = 0; i < DHCPS_LEASE_LIST_SIZE; i++) { if (leases[i].expires == 0) { return i; } } return -1; } /* add a lease into the table, clearing out any old ones */ LOCAL S32 add_lease(U32 state, char *host_name, U8 *mac, U32 ip, U32 time_lease, DHCPS_LEASE *dhcps_lease) { S32 lease_index = -1 ; IP_ADDR ipAddr = {0}; /* clean out any old ones */ clear_lease(mac, ip, dhcps_lease); lease_index = oldest_expired_lease(dhcps_lease); if (lease_index != -1) { dhcps_lease[lease_index].state = state; DHCPS_DEBUG("state = %d", dhcps_lease[lease_index].state); memcpy(dhcps_lease[lease_index].host_name, host_name, 32); /* add by Li Shaozhang, 07Jun07 */ DHCPS_DEBUG("hostname = %s", dhcps_lease[lease_index].host_name); memcpy(dhcps_lease[lease_index].mac, mac, 6); DHCPS_DEBUG("mac = %02x-%02x-%02x-%02x-%02x-%02x", dhcps_lease[lease_index].mac[0],\ dhcps_lease[lease_index].mac[1], dhcps_lease[lease_index].mac[2],\ dhcps_lease[lease_index].mac[3], dhcps_lease[lease_index].mac[4],\ dhcps_lease[lease_index].mac[5]); dhcps_lease[lease_index].ip = ip; ipAddr.ipAddr = ip; DHCPS_DEBUG("ip = %d.%d.%d.%d", ipAddr.ipAddrByteFormat[0], ipAddr.ipAddrByteFormat[1], ipAddr.ipAddrByteFormat[2], ipAddr.ipAddrByteFormat[3]); dhcps_lease[lease_index].expires = time_lease; DHCPS_DEBUG("lease = %d", dhcps_lease[lease_index].expires); } return lease_index; } /* true if a lease has expired */ LOCAL S32 lease_expired(S32 lease_index, DHCPS_LEASE *dhcps_lease) { return (dhcps_lease[lease_index].expires == 0); } /* * Find the first lease that matches chaddr, NULL if no match. * Modified by xcl, if the lease ip is not in the same subnet, deleted it and return null. */ LOCAL S32 find_lease_by_mac(U8 *mac, DHCPS_LEASE *dhcps_lease) { U32 i; for (i = 0; i < DHCPS_LEASE_LIST_SIZE; i++) { if (!memcmp(dhcps_lease[i].mac, mac, 6)) { /* If not in the very subnet, delete this lease. Modified by xcl.*/ if (0 == ((dhcps_lease[i].ip ^ dhcps_params.server) & dhcps_params.netmask)) { return i; } memset(&(dhcps_lease[i]), 0, sizeof(dhcps_lease[i])); } } return -1; } /* Find the first lease that matches yiaddr, NULL is no match */ LOCAL S32 find_lease_by_ip(U32 ip, DHCPS_LEASE *dhcps_lease) { U32 i; for (i = 0; i < DHCPS_LEASE_LIST_SIZE; i++) { if (dhcps_lease[i].ip == ip) { return i; } } return -1; } /* check is an IP is taken, if it is, add it to the lease table */ LOCAL S32 check_ip(U32 addr, DHCPS_LEASE *dhcps_lease) { char strIp[18] = {0}; /* Added for bug: dut会将lan IP(若在地址池范围内)分配出去,若收到此IP的Client无 * 免费arp检查功能,将导致IP冲突. 2011-12-27, xcl.*/ if (addr == dhcps_params.server) { DHCPS_WARN("The IP distributed equals to server ip, ignore!!!"); return 1; } if (0 == arpping(addr, recv_dhcp_packet.chaddr, dhcps_params.server, dhcps_params.mac, dhcps_params.dev_name, 500)) { DHCPS_WARN("%s belongs to someone, reserving it for %ld seconds.", strIp, dhcps_params.conflict_time); return 1; } return 0; } /* Check if an ip is in dhcp server pool or not. */ LOCAL S32 ip_in_srv_pool(U32 ip) { IP_ADDR ipAddr = {0}; ipAddr.ipAddr = ip; ip = ntohl(ip); if ((ip >= ntohl(dhcps_params.start)) && (ip <= ntohl(dhcps_params.end)) && (ip != ntohl(dhcps_params.server))) { return 1; } DHCPS_WARN("IP(%d.%d.%d.%d) not in dhcp pool or equal to server ip, ignore!!!", ipAddr.ipAddrByteFormat[0], ipAddr.ipAddrByteFormat[1], ipAddr.ipAddrByteFormat[2], ipAddr.ipAddrByteFormat[3]); return 0; } /* find an assignable address, it check_expired is true, we check all the expired leases as well. * Maybe this should try expired leases by age... */ LOCAL U32 find_address(S32 check_expired, DHCPS_LEASE *dhcps_lease) { U32 addrStart, addrEnd; /* 主机序,用于遍历地址池 */ U32 ret; /* 网络序,存放查找到的地址 */ S32 lease_index = -1; U32 mask = 0; mask = ntohl(dhcps_params.netmask); addrStart = ntohl(dhcps_params.start); addrEnd = ntohl(dhcps_params.end); for (; addrStart <= addrEnd; addrStart++)/* Modified by xcl, 2011-06-01.*/ { ret = htonl(addrStart); /* ie, 192.168.55.0 */ if (!(ret & (~mask))) { continue; } /* ie, 192.168.55.255 */ if ((ret & (~mask)) == (~mask)) { continue; } /* ip已被dhcps分配出去 */ if (-1 != (lease_index = find_lease_by_ip(ret, dhcps_lease))) { if (check_expired && lease_expired(lease_index, dhcps_lease)) { return ret; } continue; } /* 有静态接入主机正在使用该IP也要跳过 */ if (TRUE == check_ip(ret, dhcps_lease)) { continue; } return ret; } return 0; } /* send a dhcp packet, if force broadcast is set, the packet will be broadcast to the client */ LOCAL S32 send_packet(struct dhcp_packet *payload, S32 force_broadcast) { U8 *chaddr = NULL; U32 ciaddr = 0; if (force_broadcast) { DHCPS_DEBUG("Broadcasting packet to client (NAK)."); ciaddr = INADDR_BROADCAST; chaddr = MAC_BCAST_ADDR; } else if (ntohs(payload->flags) & BROADCAST_FLAG) { DHCPS_DEBUG("Broadcasting packet to client (requested)."); ciaddr = INADDR_BROADCAST; chaddr = MAC_BCAST_ADDR; } else if ((0 == payload->yiaddr) && (payload->ciaddr)) { DHCPS_DEBUG("Unicasting packet to client ciaddr."); ciaddr = payload->ciaddr; chaddr = payload->chaddr; } else { ciaddr = payload->yiaddr; chaddr = payload->chaddr; } return make_and_send_dhcp_frame(payload, dhcps_params.server, SERVER_PORT, ciaddr, CLIENT_PORT, chaddr, dhcps_params.dev); } LOCAL void init_packet(struct dhcp_packet *packet, struct dhcp_packet *old_packet, char type) { init_header(packet, type); packet->xid = old_packet->xid; memcpy(packet->chaddr, old_packet->chaddr, CHADDR_LEN); packet->flags = old_packet->flags; packet->giaddr = old_packet->giaddr; packet->ciaddr = old_packet->ciaddr; add_simple_option(packet->options, DHCP_SERVER_ID, dhcps_params.server); } /* add in the bootp options */ LOCAL void add_bootp_options(struct dhcp_packet *packet) { packet->siaddr = dhcps_params.siaddr; if (dhcps_params.sname) { strncpy((char *)packet->sname, dhcps_params.sname, sizeof(packet->sname) - 1); } if (dhcps_params.boot_file) { strncpy((char *)packet->file, dhcps_params.boot_file, sizeof(packet->file) - 1); } } LOCAL S32 get_host_name_len(char* name, S32 len) { S32 index = 0; S32 language_flag = 0; if (len < 32) { return len; } for (index=0; index < 31; index++) { /* GB2312编码每个汉字及符号以两个字节来表示,高位字节使用了0xA1-0xF7,低位字节使用了0xA1-0xFE。*/ /* 为保障存储汉字不出现乱码,出现奇数个大于0xA1的字节时,去掉最后一个。这种方法只能解决采用 */ /* GB2312编码的乱码问题 */ if (*(UINT8*)(name + index) >= 0xA1) { language_flag ^= 1; } } if (language_flag == 0) { return 31; } return 30; } /* send a DHCP OFFER to a DHCP DISCOVER */ LOCAL S32 send_offer(struct dhcp_packet *old_packet, DHCPS_LEASE *dhcps_lease) { S32 lease_index = -1; U32 req_align, lease_time_align = dhcps_params.lease_time; U8 *req, *lease_time; char blank_hostname[] = /*"Unknown"*/""; S32 copy_host_name_len; IP_ADDR ip_addr = {0}; char host_name[DHCPS_HOST_NAME_LEN]; char *host_name_start, *host_name_len; U32 lease_ip; DHCPS_DEBUG("before init_packet."); init_packet(&packet, old_packet, DHCPOFFER); /* the client has a requested ip */ if ((req = get_option(old_packet, DHCP_REQUESTED_IP)) && memcpy(&req_align, req, 4) && ip_in_srv_pool(req_align) && (((-1 == (lease_index = find_lease_by_ip(req_align, dhcps_lease))) || lease_expired(lease_index, dhcps_lease)))) { lease_ip = req_align; if (TRUE == check_ip(lease_ip, dhcps_lease)) { goto choose_dynamic_lease_ip; } packet.yiaddr = lease_ip; goto send_offer; } choose_dynamic_lease_ip: lease_index = find_lease_by_mac(old_packet->chaddr, dhcps_lease); if (-1 != lease_index) { /* lease的时间到期或者ip已经不在地址池中。 */ if ((FALSE == ip_in_srv_pool(dhcps_lease[lease_index].ip)) || lease_expired(lease_index, dhcps_lease)) { memset(&(dhcps_lease[lease_index]), 0, sizeof(dhcps_lease[lease_index])); lease_index = -1; goto choose_pool_ip; } lease_time_align = dhcps_lease[lease_index].expires; packet.yiaddr = dhcps_lease[lease_index].ip; goto send_offer; } choose_pool_ip: packet.yiaddr = find_address(0, dhcps_lease); if (0 == packet.yiaddr) { packet.yiaddr = find_address(1, dhcps_lease); } if(0 == packet.yiaddr) { DHCPS_WARN("No ip addresses to give, OFFER abandoned."); return -1; } send_offer: if (0xFFFFFFFF != lease_time_align) /* 非静态条目。 */ { if (!(host_name_start = (char *)get_option(old_packet, DHCP_HOST_NAME))) { DHCPS_WARN("Lease host name not found."); /* host_name_start = blank_hostname;*/ memset(host_name, 0, DHCPS_HOST_NAME_LEN); memcpy(host_name, blank_hostname, strlen(blank_hostname)); } else { host_name_len = host_name_start - OPT_LEN; memset(host_name, 0, DHCPS_HOST_NAME_LEN); /* fix host name length bug by tiger 20091208 */ copy_host_name_len = get_host_name_len(host_name_start, *host_name_len); memcpy(host_name, host_name_start, copy_host_name_len); } if (-1 == add_lease(DHCPOFFER, host_name, packet.chaddr, packet.yiaddr, dhcps_params.offer_time, dhcps_lease)) { DHCPS_WARN("Lease pool is full, OFFER abandoned."); return -1; } if ((lease_time = get_option(old_packet, DHCP_LEASE_TIME))) { memcpy(&lease_time_align, lease_time, 4); DHCPS_DEBUG("lease time = %d ", lease_time); lease_time_align = ntohl(lease_time_align); if (lease_time_align > (dhcps_params.lease_time*60)) { lease_time_align = (dhcps_params.lease_time*60); } } /* Make sure we aren't just using the lease time from the previous offer */ if (lease_time_align < dhcps_params.min_lease) { lease_time_align = dhcps_params.lease_time; } } DHCPS_DEBUG("OFFER lease time = %d; configed dhcp lease = %d\n", lease_time_align, dhcps_params.lease_time); add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align)); add_option_string(packet.options, dhcps_params.options.dns); add_option_string(packet.options, dhcps_params.options.subnet); add_option_string(packet.options, dhcps_params.options.router); if(dhcps_params.is_lte) { DHCPS_DEBUG("OFFER: lte enabled\n"); add_option_string(packet.options, dhcps_params.options.router4g); } /*addVendorSpecInfo(oldpacket, packet.options);*/ add_bootp_options(&packet); ip_addr.ipAddr = packet.yiaddr; DHCPS_INFO("Send OFFER with ip %d.%d.%d.%d.", ip_addr.ipAddrByteFormat[0], ip_addr.ipAddrByteFormat[1], ip_addr.ipAddrByteFormat[2], ip_addr.ipAddrByteFormat[3]); return send_packet(&packet, 0); } LOCAL S32 send_NAK(struct dhcp_packet *old_packet) { init_packet(&packet, old_packet, DHCPNAK); return send_packet(&packet, 1); } LOCAL S32 send_ACK(struct dhcp_packet *old_packet, U32 ip, DHCPS_LEASE *dhcps_lease) { U8 *lease_time; U32 lease_time_align = dhcps_params.lease_time; char blank_hostname[] = /*"Unknown"*/""; IP_ADDR ipAddr = {0}; U8 host_name[DHCPS_HOST_NAME_LEN]; U8 *host_name_start = NULL; U8 *host_name_len = NULL; S32 copy_host_name_len = 0; init_packet(&packet, old_packet, DHCPACK); packet.yiaddr = ip; if ((lease_time = get_option(old_packet, DHCP_LEASE_TIME))) { memcpy(&lease_time_align, lease_time, 4); lease_time_align = ntohl(lease_time_align); if ((lease_time_align < dhcps_params.min_lease) || (lease_time_align > dhcps_params.lease_time)) { lease_time_align = dhcps_params.lease_time; } } DHCPS_DEBUG("ACK lease time = %d\n", lease_time_align); add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align)); add_option_string(packet.options, dhcps_params.options.dns); add_option_string(packet.options, dhcps_params.options.subnet); add_option_string(packet.options, dhcps_params.options.router); if(dhcps_params.is_lte) { DHCPS_DEBUG("ACK: lte enabled\n"); add_option_string(packet.options, dhcps_params.options.router4g); } /*addVendorSpecInfo(oldpacket, packet.options);*/ add_bootp_options(&packet); ipAddr.ipAddr = packet.yiaddr; DHCPS_DEBUG("Send ACK to %d.%d.%d.%d.", ipAddr.ipAddrByteFormat[0], ipAddr.ipAddrByteFormat[1], ipAddr.ipAddrByteFormat[2], ipAddr.ipAddrByteFormat[3]); /* TODO:只在请求OFFER时输出信息 */ if (send_packet(&packet, 0) < 0) { return -1; } if (!(host_name_start = get_option(old_packet, DHCP_HOST_NAME))) { DHCPS_DEBUG("Lease host name not found."); /* TODO:只在请求OFFER时输出信息 */ memset(host_name, 0, DHCPS_HOST_NAME_LEN); memcpy(host_name, blank_hostname, strlen(blank_hostname)); } else { /* fix host name length bug by tiger 20091208 */ host_name_len = host_name_start - OPT_LEN; copy_host_name_len = get_host_name_len((char *)host_name_start, (int)*host_name_len); if(copy_host_name_len > DHCPS_HOST_NAME_LEN) { return -1; } memset(host_name, 0, DHCPS_HOST_NAME_LEN); memcpy(host_name, host_name_start, copy_host_name_len); } add_lease(DHCPACK, (char *)host_name, packet.chaddr, packet.yiaddr, lease_time_align, dhcps_lease); return OK; } LOCAL S32 send_inform(struct dhcp_packet *old_packet) { init_packet(&packet, old_packet, DHCPACK); add_option_string(packet.options, dhcps_params.options.dns); add_option_string(packet.options, dhcps_params.options.subnet); add_option_string(packet.options, dhcps_params.options.router); if(dhcps_params.is_lte) { DHCPS_DEBUG("INFORM: lte enabled\n"); add_option_string(packet.options, dhcps_params.options.router4g); } add_bootp_options(&packet); return send_packet(&packet, 0); } LOCAL S32 check_and_ack(struct dhcp_packet* packet, UINT32 ip, DHCPS_LEASE *dhcps_lease) { IP_ADDR ip_addr1 = {0}; ip_addr1.ipAddr = ip; /* if some one reserve it */ if (ip != packet->ciaddr && check_ip(ip, dhcps_lease)) { DHCPS_INFO("REQUEST ip %d.%d.%d.%d already reserved by someone", ip_addr1.ipAddrByteFormat[0], ip_addr1.ipAddrByteFormat[1], ip_addr1.ipAddrByteFormat[2] ,ip_addr1.ipAddrByteFormat[3]); return send_NAK(packet); } if (!ip_in_srv_pool(ip)) { DHCPS_INFO("REQUEST ip %d.%d.%d.%d is not in the address pool", ip_addr1.ipAddrByteFormat[0], ip_addr1.ipAddrByteFormat[1], ip_addr1.ipAddrByteFormat[2] ,ip_addr1.ipAddrByteFormat[3]); return send_NAK(packet); } return send_ACK(packet, ip, dhcps_lease); } LOCAL void destroy_sock(S32 sock) { if (-1 != sock) { close(sock); } } LOCAL S32 create_sock() { struct sockaddr_in sock_addr; S32 option = 1; S32 sock = -1; /* 因为MAX_GROUP_NUM为1,而且这里也只有1份DHCP服务器配置,这里就暂不考虑为多网段提供DHCP服务了。 */ if (ERROR == (sock = socket(AF_INET, SOCK_DGRAM, 0))) { DHCPS_WARN("server socket call failed: %m"); goto error_exit; } if (ERROR == setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&option, sizeof(option))) { DHCPS_WARN("server socket set reuseaddr option failed: %m"); goto error_exit; } if (ERROR == setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *) &option, sizeof(option))) { DHCPS_WARN("server socket set broadcast option failed: %m"); goto error_exit; } memset(&sock_addr, 0, sizeof(sock_addr)); sock_addr.sin_family = AF_INET; sock_addr.sin_port = htons(SERVER_PORT); sock_addr.sin_addr.s_addr = INADDR_ANY; /* 这里只是针对单个网段提供服务,可以这样做,但如果考虑多网段,多接口,则必须绑定接口的实际地址。 */ if (ERROR == bind(sock, (struct sockaddr *)&sock_addr, sizeof(sock_addr))) { DHCPS_WARN("server socket set broadcast option failed: %m"); 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requested = get_option(&recv_dhcp_packet, DHCP_REQUESTED_IP); server_id = get_option(&recv_dhcp_packet, DHCP_SERVER_ID); if (NULL != requested) { memcpy(&requested_align, requested, 4); } if (NULL != server_id) { memcpy(&server_id_align, server_id, 4); } if (-1 != lease_index) { /* SELECTING State */ if ((NULL != server_id) && (server_id_align == dhcps_params.server) && (NULL != requested) && (requested_align == dhcps_lease[lease_index].ip)) { send_ACK(&recv_dhcp_packet, dhcps_lease[lease_index].ip, dhcps_lease); } /* INIT-REBOOT State */ else if ((NULL == server_id) && (NULL != requested) && (dhcps_lease[lease_index].ip == requested_align)) { send_ACK(&recv_dhcp_packet, dhcps_lease[lease_index].ip, dhcps_lease); } /* RENEWING or REBINDING State */ else if ((NULL == server_id) && (NULL == requested) && (dhcps_lease[lease_index].ip == recv_dhcp_packet.ciaddr)) { send_ACK(&recv_dhcp_packet, dhcps_lease[lease_index].ip, dhcps_lease); } else { /* todo: 显示有效的requested_align */ ip_addr1.ipAddr = recv_dhcp_packet.ciaddr; ip_addr2.ipAddr = dhcps_lease[lease_index].ip; DHCPS_INFO("Send NAK to %d.%d.%d.%d, lease ip %d.%d.%d.%d.", ip_addr1.ipAddrByteFormat[0], ip_addr1.ipAddrByteFormat[1], ip_addr1.ipAddrByteFormat[2] ,ip_addr1.ipAddrByteFormat[3], ip_addr2.ipAddrByteFormat[0], ip_addr2.ipAddrByteFormat[1],ip_addr2.ipAddrByteFormat[2], ip_addr2.ipAddrByteFormat[3]); send_NAK(&recv_dhcp_packet); } } else if (NULL != requested) { /* INIT-REBOOT State */ if (-1 != (lease_index = find_lease_by_ip(requested_align, dhcps_lease))) { /* Requested IP already reserved by other one */ if (lease_expired(lease_index, dhcps_lease)) { /* probably best if we drop this lease */ memset(&(dhcps_lease[lease_index]), 0, sizeof(dhcps_lease[lease_index])); lease_index = -1; check_and_ack(&recv_dhcp_packet, requested_align, dhcps_lease); /* make some contention for this address */ } else /* still reserved by someone */ { ip_addr1.ipAddr = requested_align; DHCPS_INFO("REQUEST ip %d.%d.%d.%d already reserved by %02X:%02X:%02X:%02X:%02X:%02X", ip_addr1.ipAddrByteFormat[0], ip_addr1.ipAddrByteFormat[1], ip_addr1.ipAddrByteFormat[2], ip_addr1.ipAddrByteFormat[3], dhcps_lease[lease_index].mac[0], dhcps_lease[lease_index].mac[1], dhcps_lease[lease_index].mac[2], dhcps_lease[lease_index].mac[3], dhcps_lease[lease_index].mac[4], dhcps_lease[lease_index].mac[5]); send_NAK(&recv_dhcp_packet); } } else { check_and_ack(&recv_dhcp_packet, requested_align, dhcps_lease); } } else { ip_addr1.ipAddr = recv_dhcp_packet.ciaddr; DHCPS_INFO("Send NAK to %d.%d.%d.%d.", ip_addr1.ipAddrByteFormat[0], ip_addr1.ipAddrByteFormat[1], ip_addr1.ipAddrByteFormat[2], ip_addr1.ipAddrByteFormat[3]); send_NAK(&recv_dhcp_packet); } /* otherwise on reply. */ break; case DHCPDECLINE: DHCPS_INFO("Recv DECLINE from %02X:%02X:%02X:%02X:%02X:%02X.", recv_dhcp_packet.chaddr[0], recv_dhcp_packet.chaddr[1], recv_dhcp_packet.chaddr[2], recv_dhcp_packet.chaddr[3], recv_dhcp_packet.chaddr[4], recv_dhcp_packet.chaddr[5]); if (lease_index != -1) { memset(dhcps_lease[lease_index].mac, 0, 6); dhcps_lease[lease_index].expires = dhcps_params.decline_time; dhcps_lease[lease_index].state = 0; } break; case DHCPRELEASE: DHCPS_INFO("Recv RELEASE from %02X:%02X:%02X:%02X:%02X:%02X.", recv_dhcp_packet.chaddr[0], recv_dhcp_packet.chaddr[1], recv_dhcp_packet.chaddr[2], recv_dhcp_packet.chaddr[3], recv_dhcp_packet.chaddr[4], recv_dhcp_packet.chaddr[5]); if (lease_index != -1) { /* Delete the lease, lsz 080221 */ memset(&(dhcps_lease[lease_index]), 0, sizeof(dhcps_lease[lease_index])); for (move_index = lease_index; (move_index + 1) < DHCPS_LEASE_LIST_SIZE; move_index++) { memcpy(&(dhcps_lease[move_index]), &(dhcps_lease[move_index + 1]), sizeof(dhcps_lease[move_index])); memset(&(dhcps_lease[move_index + 1]), 0, sizeof(dhcps_lease[move_index + 1])); } } break; case DHCPINFORM: DHCPS_DEBUG("Recv INFORM from %02X:%02X:%02X:%02X:%02X:%02X.", recv_dhcp_packet.chaddr[0], recv_dhcp_packet.chaddr[1], recv_dhcp_packet.chaddr[2], recv_dhcp_packet.chaddr[3], recv_dhcp_packet.chaddr[4], recv_dhcp_packet.chaddr[5]); send_inform(&recv_dhcp_packet); break; default: DHCPS_WARN("Unsupported DHCP message (%02x) -- ignoring.", state[0]); } return; } LOCAL S32 dhcps_start_cb(dms_handler_t *handler, U8 *mbuf, U32 mlen, U32 sender_dms_id) { DHCPS_MSG *dhcps_msg = (DHCPS_MSG *)mbuf; U32 temp_ip = 0; IP_ADDR ipaddr; if ((NULL == dhcps_msg) || (mlen != sizeof(DHCPS_MSG))) { return ERROR; } strcpy(dhcps_params.dev_name, dhcps_msg->dev_name); if (0 > read_interface_info(dhcps_params.dev_name, &dhcps_params.dev, dhcps_params.mac)) { DHCPS_DEBUG("Read interface info error"); return ERROR; } if (ntohl(dhcps_msg->pool_start) > ntohl(dhcps_msg->pool_end)) { temp_ip = dhcps_msg->pool_start; dhcps_msg->pool_start = dhcps_msg->pool_end; dhcps_msg->pool_end = temp_ip; } if ((dhcps_msg->pool_start != dhcps_params.start) || (dhcps_msg->pool_end != dhcps_params.end)) { dhcps_params.start= dhcps_msg->pool_start; dhcps_params.end = dhcps_msg->pool_end; memset(dhcps_params.lease, 0, sizeof(DHCPS_LEASE)*DHCPS_LEASE_LIST_SIZE); } dhcps_params.gateway = dhcps_msg->gateway; dhcps_params.lease_time = dhcps_msg->lease_time; dhcps_params.dns_server[0] = dhcps_msg->pri_dns; dhcps_params.dns_server[1] = dhcps_msg->snd_dns; dhcps_params.server = dhcps_msg->gateway; dhcps_params.netmask = dhcps_msg->netmask; /* 是否4G路由 */ dhcps_params.is_lte = get_lte_enabled(); memset(&dhcps_params.options, 0, sizeof(DHCP_OPTION_STATIC)); dhcps_params.options.lease[0] = DHCP_LEASE_TIME; dhcps_params.options.lease[1] = 4; memcpy(&(dhcps_params.options.lease[2]), &(dhcps_params.lease_time), 4); temp_ip = dhcps_params.netmask; dhcps_params.options.subnet[0] = DHCP_SUBNET; dhcps_params.options.subnet[1] = 4; memcpy(&(dhcps_params.options.subnet[2]), (char *)&temp_ip, 4); dhcps_params.options.router[0] = DHCP_ROUTER; dhcps_params.options.router[1] = 4; memcpy(&(dhcps_params.options.router[2]), (char *)&dhcps_params.gateway, 4); dhcps_params.options.dns[0] = DHCP_DNS_SERVER; dhcps_params.options.dns[1] = 4; memcpy(&(dhcps_params.options.dns[2]), (char *)&dhcps_params.dns_server[0], 4); dhcps_params.options.router4g[0] = DHCP_4G_ROUTER; dhcps_params.options.router4g[1] = DHCP_4G_ROUTER_LEN; memcpy(&(dhcps_params.options.router4g[2]), DHCP_4G_ROUTER_STR, DHCP_4G_ROUTER_LEN); if (-1 == dhcps_params.sock) { dhcps_params.sock = create_sock(); if (-1 == dhcps_params.sock) { DHCPS_DEBUG("create socket error"); return ERROR; } } if (-1 == dhcps_params.inet_iendx) { dhcps_params.inet_iendx = inet_add_socket(dhcps_params.sock, (void*)dhcps_handle, NULL, NULL); if (ERROR == dhcps_params.inet_iendx) { destroy_sock(dhcps_params.sock); dhcps_params.sock = -1; DHCPS_DEBUG("Listen socket error"); return ERROR; } } if (-1 == dhcps_params.timer_index) { dhcps_params.timer_index = inet_add_timer((void*)dhcps_check_timer, 0, 1, EXECUTE_FOREVER); if (ERROR == dhcps_params.timer_index) { inet_del_socket(dhcps_params.inet_iendx); dhcps_params.inet_iendx = -1; destroy_sock(dhcps_params.sock); dhcps_params.sock = -1; DHCPS_DEBUG("Add timer error"); return ERROR; } } DHCPS_INFO("Start DHCP server"); ipaddr.ipAddr = dhcps_params.server; DHCPS_DEBUG("Server = %d.%d.%d.%d", ipaddr.ipAddrByteFormat[0], ipaddr.ipAddrByteFormat[1], ipaddr.ipAddrByteFormat[2], ipaddr.ipAddrByteFormat[3]); ipaddr.ipAddr = dhcps_params.netmask; DHCPS_DEBUG("Netmask = %d.%d.%d.%d", ipaddr.ipAddrByteFormat[0], ipaddr.ipAddrByteFormat[1], ipaddr.ipAddrByteFormat[2], ipaddr.ipAddrByteFormat[3]); ipaddr.ipAddr = dhcps_params.dns_server[0]; DHCPS_DEBUG("DNS1 = %d.%d.%d.%d", ipaddr.ipAddrByteFormat[0], ipaddr.ipAddrByteFormat[1], ipaddr.ipAddrByteFormat[2], ipaddr.ipAddrByteFormat[3]); 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