1 #include "kvm/uip.h" 2 3 #include <arpa/inet.h> 4 5 static inline bool uip_dhcp_is_discovery(struct uip_dhcp *dhcp) 6 { 7 return (dhcp->option[2] == UIP_DHCP_DISCOVER && 8 dhcp->option[1] == UIP_DHCP_TAG_MSG_TYPE_LEN && 9 dhcp->option[0] == UIP_DHCP_TAG_MSG_TYPE); 10 } 11 12 static inline bool uip_dhcp_is_request(struct uip_dhcp *dhcp) 13 { 14 return (dhcp->option[2] == UIP_DHCP_REQUEST && 15 dhcp->option[1] == UIP_DHCP_TAG_MSG_TYPE_LEN && 16 dhcp->option[0] == UIP_DHCP_TAG_MSG_TYPE); 17 } 18 19 bool uip_udp_is_dhcp(struct uip_udp *udp) 20 { 21 struct uip_dhcp *dhcp; 22 23 if (ntohs(udp->sport) != UIP_DHCP_PORT_CLIENT || 24 ntohs(udp->dport) != UIP_DHCP_PORT_SERVER) 25 return false; 26 27 dhcp = (struct uip_dhcp *)udp; 28 29 if (ntohl(dhcp->magic_cookie) != UIP_DHCP_MAGIC_COOKIE) 30 return false; 31 32 return true; 33 } 34 35 int uip_dhcp_get_dns(struct uip_info *info) 36 { 37 char key[256], val[256]; 38 struct in_addr addr; 39 int ret = -1; 40 int n = 0; 41 FILE *fp; 42 u32 ip; 43 44 fp = fopen("/etc/resolv.conf", "r"); 45 if (!fp) 46 goto out; 47 48 while (!feof(fp)) { 49 if (fscanf(fp, "%s %s\n", key, val) != 2) 50 continue; 51 if (strncmp("domain", key, 6) == 0) 52 info->domain_name = strndup(val, UIP_DHCP_MAX_DOMAIN_NAME_LEN); 53 else if (strncmp("nameserver", key, 10) == 0) { 54 if (!inet_aton(val, &addr)) 55 continue; 56 ip = ntohl(addr.s_addr); 57 if (n < UIP_DHCP_MAX_DNS_SERVER_NR) 58 info->dns_ip[n++] = ip; 59 ret = 0; 60 } 61 } 62 63 out: 64 fclose(fp); 65 return ret; 66 } 67