From: K. Y. Srinivasan <ksrinivasan at novell.com> Subject: An implementation of key/value pair feature (KVP) for Linux on HyperV. Signed-off-by: K. Y. Srinivasan <ksrinivasan at novell.com> Index: linux.trees.git/drivers/staging/hv/tools/hv_kvp_daemon.c ==================================================================--- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux.trees.git/drivers/staging/hv/tools/hv_kvp_daemon.c 2010-12-07 08:46:19.000000000 -0500 @@ -0,0 +1,470 @@ +/* + * An implementation of key value pair (KVP) functionality for Linux. + * + * + * Copyright (C) 2010, Novell, Inc. + * Author : K. Y. Srinivasan <ksrinivasan at novell.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * 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, GOOD TITLE or + * NON INFRINGEMENT. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/poll.h> +#include <sys/utsname.h> +#include <linux/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <arpa/inet.h> +#include <linux/connector.h> +#include <linux/netlink.h> +#include <sys/socket.h> +#include <ifaddrs.h> +#include <netdb.h> +#include <syslog.h> + +/* + * KYS: TODO. Need to register these in the kernel. + * + * The following definitions are shared with the in-kernel component; do not + * change any of this without making the corresponding changes in + * the KVP kernel component. + */ +#define CN_KVP_IDX 0x9 /* MSFT KVP functionality */ +#define CN_KVP_VAL 0x1 /* This supports queries from the kernel */ +#define CN_KVP_USER_VAL 0x2 /* This supports queries from the user */ + +/* + * KVP protocol: The user mode component first registers with the + * the kernel component. Subsequently, the kernel component requests, data + * for the specified keys. In response to this message the user mode component + * fills in the value corresponding to the specified key. We overload the + * sequence field in the cn_msg header to define our KVP message types. + * + * We use this infrastructure for also supporting queries from user mode + * application for state that may be maintained in the KVP kernel component. + * + * XXXKYS: Have a shared header file between the user and kernel (TODO) + */ + +enum kvp_op { + KVP_REGISTER = 0, /* Register the user mode component*/ + KVP_KERNEL_GET, /*Kernel is requesting the value for the specified key*/ + KVP_KERNEL_SET, /*Kernel is providing the value for the specified key*/ + KVP_USER_GET, /*User is requesting the value for the specified key*/ + KVP_USER_SET /*User is providing the value for the specified key*/ +}; + +#define HV_KVP_EXCHANGE_MAX_KEY_SIZE 512 +#define HV_KVP_EXCHANGE_MAX_VALUE_SIZE 2048 + +struct hv_ku_msg { + __u32 kvp_index; + __u8 kvp_key[HV_KVP_EXCHANGE_MAX_KEY_SIZE]; /* Key name */ + __u8 kvp_value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE]; /* Key value */ +}; + +enum key_index { + FullyQualifiedDomainName = 0, + IntegrationServicesVersion, /*This key is serviced in the kernel*/ + NetworkAddressIPv4, + NetworkAddressIPv6, + OSBuildNumber, + OSName, + OSMajorVersion, + OSMinorVersion, + OSVersion, + ProcessorArchitecture +}; + +/* + * End of shared definitions. + */ + +static char kvp_send_buffer[4096]; +static char kvp_recv_buffer[4096]; +static struct sockaddr_nl addr; + +static char os_name[100]; +static char os_major[50]; +static char os_minor[50]; +static char processor_arch[50]; +static char os_build[100]; +static char *lic_version; + +void kvp_get_os_info(void) +{ + FILE *file; + char *eol; + struct utsname buf; + + uname(&buf); + strcpy(os_build, buf.release); + strcpy(processor_arch, buf.machine); + + file = fopen("/etc/SuSE-release", "r"); + if (file != NULL) + goto kvp_osinfo_found; + file = fopen("/etc/redhat-release", "r"); + if (file != NULL) + goto kvp_osinfo_found; + /* + * Add code for other supported platforms. + */ + + /* + * We don't have information about the os. + */ + strcpy(os_name, "Linux"); + strcpy(os_major, "0"); + strcpy(os_minor, "0"); + return; + +kvp_osinfo_found: + fgets(os_name, 99, file); + eol = index(os_name, '\n'); + *eol = '\0'; + fgets(os_major, 49, file); + eol = index(os_major, '\n'); + *eol = '\0'; + fgets(os_minor, 49, file); + eol = index(os_minor, '\n'); + *eol = '\0'; + fclose(file); + return; +} + +static int +kvp_get_ip_address(int family, char *buffer, int length) +{ + struct ifaddrs *ifap; + struct ifaddrs *curp; + int ipv4_len = strlen("255.255.255.255") + 1; + int ipv6_len = strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1; + int offset = 0; + const char *str; + char tmp[50]; + int error = 0; + + /* + * On entry into this function, the buffer is capable of holding the + * maximum key value (2048 bytes). + */ + + if (getifaddrs(&ifap)) { + strcpy(buffer, "getifaddrs failed\n"); + return 1; + } + + curp = ifap; + while (curp != NULL) { + if ((curp->ifa_addr != NULL) && + (curp->ifa_addr->sa_family == family)) { + if (family == AF_INET) { + struct sockaddr_in *addr + (struct sockaddr_in *) curp->ifa_addr; + + str = inet_ntop(family, &addr->sin_addr, + tmp, 50); + if (str == NULL) { + strcpy(buffer, "inet_ntop failed\n"); + error = 1; + goto getaddr_done; + } + if (offset == 0) + strcpy(buffer, tmp); + else + strcat(buffer, tmp); + strcat(buffer, ";"); + + offset += strlen(str) + 1; + if ((length - offset) < (ipv4_len + 1)) + goto getaddr_done; + + } else { + + /* + * We only support AF_INET and AF_INET6 + * and the list of addresses is seperated by a ";". + */ + struct sockaddr_in6 *addr + (struct sockaddr_in6 *) curp->ifa_addr; + + str = inet_ntop(family, + &addr->sin6_addr.s6_addr, + tmp, 50); + if (str == NULL) { + strcpy(buffer, "inet_ntop failed\n"); + error = 1; + goto getaddr_done; + } + if (offset == 0) + strcpy(buffer, tmp); + else + strcat(buffer, tmp); + strcat(buffer, ";"); + offset += strlen(str) + 1; + if ((length - offset) < (ipv6_len + 1)) + goto getaddr_done; + + } + + } + curp = curp->ifa_next; + } + +getaddr_done: + freeifaddrs(ifap); + return error; +} + + +static int +kvp_get_domain_name(char *buffer, int length) +{ + struct addrinfo hints, *info ; + gethostname(buffer, length); + int error = 0; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */ + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = AI_CANONNAME; + + error = getaddrinfo(buffer, "http", &hints, &info); + if (error != 0) { + strcpy(buffer, "getaddrinfo failed\n"); + error = 1; + goto get_domain_done; + } + strcpy(buffer, info->ai_canonname); +get_domain_done: + freeaddrinfo(info); + return error; +} + +static int +netlink_send(int fd, struct cn_msg *msg) +{ + struct nlmsghdr *nlh; + unsigned int size; + struct msghdr message; + char buffer[64]; + struct iovec iov[2]; + + size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len); + + nlh = (struct nlmsghdr *)buffer; + nlh->nlmsg_seq = 0; + nlh->nlmsg_pid = getpid(); + nlh->nlmsg_type = NLMSG_DONE; + nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh)); + nlh->nlmsg_flags = 0; + + iov[0].iov_base = nlh; + iov[0].iov_len = sizeof(*nlh); + + iov[1].iov_base = msg; + iov[1].iov_len = size; + + memset(&message, 0, sizeof(message)); + message.msg_name = &addr; + message.msg_namelen = sizeof(addr); + message.msg_iov = iov; + message.msg_iovlen = 2; + + return sendmsg(fd, &message, 0); +} + +main(void) +{ + int fd, len, sock_opt; + int error; + struct cn_msg *message; + struct pollfd pfd; + struct nlmsghdr *incoming_msg; + struct cn_msg *incoming_cn_msg; + char *key_value; + char *key_name; + int key_index; + + daemon(1, 0); + openlog("KVP", 0, LOG_USER); + syslog(LOG_INFO, "KVP starting; pid is:%d", getpid()); + /* + * Retrieve OS release information. + */ + kvp_get_os_info(); + + fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR); + if (fd < 0) { + syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd); + exit(-1); + } + addr.nl_family = AF_NETLINK; + addr.nl_pad = 0; + addr.nl_pid = 0; + addr.nl_groups = CN_KVP_IDX; + + + error = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); + if (error < 0) { + syslog(LOG_ERR, "bind failed; error:%d", error); + close(fd); + exit(-1); + } + sock_opt = addr.nl_groups; + setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt)); + /* + * Register ourselves with the kernel. + */ + message = (struct cn_msg *)kvp_send_buffer; + message->id.idx = CN_KVP_IDX; + message->id.val = CN_KVP_VAL; + message->seq = KVP_REGISTER; + message->ack = 0; + message->len = 0; + + len = netlink_send(fd, message); + if (len < 0) { + syslog(LOG_ERR, "netlink_send failed; error:%d", len); + close(fd); + exit(-1); + } + + pfd.fd = fd; + + while (1) { + pfd.events = POLLIN; + pfd.revents = 0; + poll(&pfd, 1, -1); + + len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0); + + if (len < 0) { + syslog(LOG_ERR, "recv failed; error:%d", len); + close(fd); + return -1; + } + + incoming_msg = (struct nlmsghdr *)kvp_recv_buffer; + incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg); + + switch (incoming_cn_msg->seq) { + case KVP_REGISTER: + /* + * Driver is registering with us; stash away the version + * information. + */ + lic_version = malloc(strlen(incoming_cn_msg->data) + 1); + if (lic_version) { + strcpy(lic_version, incoming_cn_msg->data); + syslog(LOG_INFO, "KVP LIC Version: %s", + lic_version); + } else { + syslog(LOG_ERR, "malloc failed"); + } + continue; + + case KVP_KERNEL_GET: + break; + default: + continue; + } + + key_index + ((struct hv_ku_msg *)incoming_cn_msg->data)->kvp_index; + key_name + ((struct hv_ku_msg *)incoming_cn_msg->data)->kvp_key; + key_value + ((struct hv_ku_msg *)incoming_cn_msg->data)->kvp_value; + + switch (key_index) { + case FullyQualifiedDomainName: + kvp_get_domain_name(key_value, + HV_KVP_EXCHANGE_MAX_VALUE_SIZE); + strcpy(key_name, "FullyQualifiedDomainName"); + break; + case IntegrationServicesVersion: + strcpy(key_name, "IntegrationServicesVersion"); + strcpy(key_value, lic_version); + break; + case NetworkAddressIPv4: + kvp_get_ip_address(AF_INET, key_value, + HV_KVP_EXCHANGE_MAX_VALUE_SIZE); + strcpy(key_name, "NetworkAddressIPv4"); + break; + case NetworkAddressIPv6: + kvp_get_ip_address(AF_INET6, key_value, + HV_KVP_EXCHANGE_MAX_VALUE_SIZE); + strcpy(key_name, "NetworkAddressIPv6"); + break; + case OSBuildNumber: + strcpy(key_value, os_build); + strcpy(key_name, "OSBuildNumber"); + break; + case OSName: + strcpy(key_value, os_name); + strcpy(key_name, "OSName"); + break; + case OSMajorVersion: + strcpy(key_value, os_major); + strcpy(key_name, "OSMajorVersion"); + break; + case OSMinorVersion: + strcpy(key_value, os_minor); + strcpy(key_name, "OSMinorVersion"); + break; + case OSVersion: + strcpy(key_value, os_build); + strcpy(key_name, "OSVersion"); + break; + case ProcessorArchitecture: + strcpy(key_value, processor_arch); + strcpy(key_name, "ProcessorArchitecture"); + break; + default: + strcpy(key_value, "Unknown Key"); + /* + * We use a null key name to terminate enumeration. + */ + strcpy(key_name, ""); + break; + } + /* + * Send the value back to the kernel. The response is + * already in the receive buffer. Update the cn_msg header to + * reflect the key value that has been added to the message + */ + + incoming_cn_msg->id.idx = CN_KVP_IDX; + incoming_cn_msg->id.val = CN_KVP_VAL; + incoming_cn_msg->seq = KVP_USER_SET; + incoming_cn_msg->ack = 0; + incoming_cn_msg->len = sizeof(struct hv_ku_msg); + + len = netlink_send(fd, incoming_cn_msg); + if (len < 0) { + syslog(LOG_ERR, "net_link send failed; error:%d", len); + exit(-1); + } + } + +} -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: hv_kvp_daemon.patch Url: http://lists.linux-foundation.org/pipermail/virtualization/attachments/20101207/d48f6609/attachment-0001.txt