This patch get domain name and nameserver information from host config file /etc/resolv.conf.
Guest can obtain DNS information through DHCP. Signed-off-by: Asias He <[email protected]> --- tools/kvm/include/kvm/uip.h | 6 ++++++ tools/kvm/net/uip/dhcp.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+), 0 deletions(-) diff --git a/tools/kvm/include/kvm/uip.h b/tools/kvm/include/kvm/uip.h index 6534c7f..e645d3f 100644 --- a/tools/kvm/include/kvm/uip.h +++ b/tools/kvm/include/kvm/uip.h @@ -42,6 +42,8 @@ #define UIP_DHCP_OFFER 2 #define UIP_DHCP_REQUEST 3 #define UIP_DHCP_ACK 5 +#define UIP_DHCP_MAX_DNS_SERVER_NR 3 +#define UIP_DHCP_MAX_DOMAIN_NAME_LEN 256 #define UIP_DHCP_TAG_MSG_TYPE 53 #define UIP_DHCP_TAG_MSG_TYPE_LEN 1 /* @@ -178,6 +180,8 @@ struct uip_info { int buf_free_nr; int buf_used_nr; u32 host_ip; + u32 dns_ip[UIP_DHCP_MAX_DNS_SERVER_NR]; + char *domain_name; u32 buf_nr; }; @@ -327,4 +331,6 @@ struct uip_buf *uip_buf_clone(struct uip_tx_arg *arg); int uip_udp_make_pkg(struct uip_info *info, struct uip_udp_socket *sk, struct uip_buf *buf, u8 *payload, int payload_len); bool uip_udp_is_dhcp(struct uip_udp *udp); + +int uip_dhcp_get_dns(struct uip_info *info); #endif /* KVM__UIP_H */ diff --git a/tools/kvm/net/uip/dhcp.c b/tools/kvm/net/uip/dhcp.c index 0a6293a..9321cdc 100644 --- a/tools/kvm/net/uip/dhcp.c +++ b/tools/kvm/net/uip/dhcp.c @@ -1,5 +1,7 @@ #include "kvm/uip.h" +#include <arpa/inet.h> + static inline bool uip_dhcp_is_discovery(struct uip_dhcp *dhcp) { return (dhcp->option[2] == UIP_DHCP_DISCOVER && @@ -29,3 +31,35 @@ bool uip_udp_is_dhcp(struct uip_udp *udp) return true; } + +int uip_dhcp_get_dns(struct uip_info *info) +{ + char key[256], val[256]; + struct in_addr addr; + int ret = -1; + int n = 0; + FILE *fp; + u32 ip; + + fp = fopen("/etc/resolv.conf", "r"); + if (!fp) + goto out; + + while (!feof(fp)) { + fscanf(fp, "%s %s\n", key, val); + if (strncmp("domain", key, 6) == 0) + info->domain_name = strndup(val, UIP_DHCP_MAX_DOMAIN_NAME_LEN); + else if (strncmp("nameserver", key, 10) == 0) { + if (!inet_aton(val, &addr)) + continue; + ip = ntohl(addr.s_addr); + if (n < UIP_DHCP_MAX_DNS_SERVER_NR) + info->dns_ip[n++] = ip; + ret = 0; + } + } + +out: + fclose(fp); + return ret; +} -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
