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568 lines
13 KiB
568 lines
13 KiB
// (c) 2012 Timothy Pearson
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// (c) 2012 Raptor Engineering
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// ALL RIGHTS RESERVED
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <pwd.h>
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#include <grp.h>
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#include <time.h>
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#include <mysql/mysql.h>
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#include "libraptorsmiface.h"
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MYSQL *conn = 0;
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char *server = "localhost";
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char *user = "remotelab";
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char *password = "rlpass123"; /* set me first */
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char *database = "remotelab_sm";
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void dprint(const char *fmt, ...)
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{
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va_list argp;
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va_start(argp, fmt);
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#if 0
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vprintf(fmt, argp);
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#else
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char debug[1024];
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vsprintf(debug, fmt, argp);
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FILE *fp = fopen("/raptorsmiface.debug", "a");
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if (fp != NULL)
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{
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fputs(debug, fp);
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fclose(fp);
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}
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#endif
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va_end(argp);
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}
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void connect_if_needed() {
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if (!conn) {
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conn = mysql_init(NULL);
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if (!mysql_real_connect(conn, server, user, password, database, 0, NULL, 0)) {
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dprint("[ERROR] MySQL connection FAILED [%s]\n\r", mysql_error(conn));
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conn = 0;
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}
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}
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}
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char* get_mysql_escaped_string(MYSQL *sqlcn, char* rawstr) {
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unsigned int minlen = strlen(rawstr);
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unsigned int maxlen = ((minlen*2)+1);
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char* escstr = malloc(maxlen*sizeof(char));
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mysql_real_escape_string(sqlcn, escstr, rawstr, minlen);
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return escstr;
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}
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char* get_group_for_user(char* username) {
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struct passwd* pwd;
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pwd = getpwnam(username);
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if (!pwd) {
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return true;
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}
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gid_t groupid = pwd->pw_gid;
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struct group* primarygroup;
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primarygroup = getgrgid(groupid);
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if (!primarygroup) {
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return true;
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}
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return strdup(primarygroup->gr_name);
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}
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char raptor_sm_deallocate_session(char* username) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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MYSQL_RES *svr_res;
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MYSQL_ROW svr_row;
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MYSQL_RES *cnt_res;
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MYSQL_ROW cnt_row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return 1;
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}
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// Remove the user from the system
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "DELETE FROM sessions WHERE username='%s'", safe_username);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return 2;
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}
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else {
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free(query);
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return 0;
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}
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}
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char* raptor_sm_allocate_session(char* username) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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MYSQL_RES *svr_res;
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MYSQL_ROW svr_row;
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MYSQL_RES *cnt_res;
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MYSQL_ROW cnt_row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return strdup("SQLERR001");
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}
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// Verify that this user is not already on the system
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "SELECT servername FROM sessions WHERE username='%s'", safe_username);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return strdup("SQLERR002");
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}
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else {
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free(query);
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res = mysql_store_result(conn);
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if ((row = mysql_fetch_row(res)) == NULL) {
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// User is not on a system
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// Find the least utilized node
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if (mysql_query(conn, "SELECT name FROM servers")) {
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// Server error
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mysql_free_result(res);
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return strdup("SQLERR003");
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}
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else {
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svr_res = mysql_store_result(conn);
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char* bestserver = strdup("");
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int bestusage = INT_MAX;
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while ((svr_row = mysql_fetch_row(svr_res)) != NULL) {
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char* safe_servername = get_mysql_escaped_string(conn, svr_row[0]);
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asprintf(&query, "SELECT username FROM sessions WHERE servername='%s'", safe_servername);
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free(safe_servername);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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free(bestserver);
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mysql_free_result(res);
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mysql_free_result(svr_res);
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return strdup("SQLERR004");
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}
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else {
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free(query);
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cnt_res = mysql_store_result(conn);
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int usagecount = 0;
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while ((cnt_row = mysql_fetch_row(cnt_res)) != NULL) {
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usagecount++;
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}
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mysql_free_result(cnt_res);
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if (usagecount < bestusage) {
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free(bestserver);
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bestserver = strdup(svr_row[0]);
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bestusage = usagecount;
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}
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}
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}
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mysql_free_result(res);
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mysql_free_result(svr_res);
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// Insert new information into the sessions database and set status to ALLOCATED
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char* safe_servername = get_mysql_escaped_string(conn, bestserver);
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "INSERT INTO sessions (username, servername, state) VALUES ('%s', '%s', '%d')", safe_username, safe_servername, SM_STATUS_ALLOCATED);
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free(safe_servername);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return strdup("SQLERR005");
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}
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else {
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free(query);
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return strdup(bestserver);
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}
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}
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}
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else {
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char* ret = strdup(row[0]);
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mysql_free_result(res);
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return ret;
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}
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}
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}
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char* raptor_sm_get_ip_for_hostname(char* hostname, char* error) {
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struct addrinfo hints, *res;
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struct in_addr addr;
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int err;
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_family = AF_INET;
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if ((err = getaddrinfo(hostname, NULL, &hints, &res)) != 0) {
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if (error) *error = 1;
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return strdup("");
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}
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addr.s_addr = ((struct sockaddr_in *)(res->ai_addr))->sin_addr.s_addr;
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char* ret = strdup(inet_ntoa(addr));
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freeaddrinfo(res);
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if (error) *error = 0;
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return ret;
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}
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char* raptor_sm_get_hostname_for_username(char* username, bool create) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return strdup("SQLERR100");
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}
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "SELECT servername FROM sessions WHERE username='%s'", safe_username);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return strdup("SQLERR101");
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}
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else {
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free(query);
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res = mysql_store_result(conn);
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while ((row = mysql_fetch_row(res)) != NULL) {
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char* ret = strdup(row[0]);
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mysql_free_result(res);
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return ret;
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}
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// Nothing in the DB
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mysql_free_result(res);
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if (create) {
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// Try to allocate a new session on a node
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return raptor_sm_allocate_session(username);
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}
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else {
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return strdup("");
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}
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}
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}
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char* raptor_sm_get_ip_for_username(char* username, bool create) {
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char* hostname = raptor_sm_get_hostname_for_username(username, create);
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char err;
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char* ip = raptor_sm_get_ip_for_hostname(hostname, &err);
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if (err) {
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raptor_sm_deallocate_session(username);
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}
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free(hostname);
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return ip;
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}
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bool raptor_sm_sesslimit_reached(char* username) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return true;
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}
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// Respect maximum session number for the group for this user
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int sesslimit = 0; // Default to denying all sessions
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// Get group for user
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char* groupname = get_group_for_user(username);
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char* safe_groupname = get_mysql_escaped_string(conn, groupname);
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free(groupname);
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asprintf(&query, "SELECT sesslimit FROM groups WHERE groupname='%s'", safe_groupname);
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free(safe_groupname);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return true;
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}
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else {
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free(query);
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res = mysql_store_result(conn);
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row = mysql_fetch_row(res);
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if (row[0]) {
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sesslimit = atoi(row[0]);
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}
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mysql_free_result(res);
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}
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// Figure out how many users are online from this group
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int sesscount = 0;
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asprintf(&query, "SELECT username FROM sessions WHERE state<>'%d'", SM_STATUS_ALLOCATED);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return true;
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}
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else {
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free(query);
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res = mysql_store_result(conn);
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while ((row = mysql_fetch_row(res)) != NULL) {
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if (row[0]) {
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char* test_groupname = get_group_for_user(row[0]);
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if (strcmp(groupname, test_groupname) == 0) {
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sesscount++;
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}
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free(test_groupname);
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}
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}
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mysql_free_result(res);
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if (sesscount < sesslimit) {
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return false;
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}
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return true;
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}
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// We should never end up here!
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return true;
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}
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pid_t raptor_sm_run_remote_server(char* username, char *const argv[]) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return -1;
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}
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// Respect maximum session number for the group for this user
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if (raptor_sm_sesslimit_reached(username)) {
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return -5;
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}
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// Make sure a server is not already running for this user
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// Return the existing PID if it is
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "SELECT pid FROM sessions WHERE username='%s' AND state<>'%d'", safe_username, SM_STATUS_ALLOCATED);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return -2;
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}
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else {
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free(query);
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res = mysql_store_result(conn);
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while ((row = mysql_fetch_row(res)) != NULL) {
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if (row[0]) {
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int ret = atoi(row[0]);
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if (ret >= 0) {
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mysql_free_result(res);
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return ret;
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}
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}
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}
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mysql_free_result(res);
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}
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int i;
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int n_commands;
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n_commands = 0;
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while (argv[n_commands] != NULL) {
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n_commands++;
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}
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char* ipaddr = raptor_sm_get_ip_for_username(username, true);
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// This is HORRIBLY inefficient
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char* command_string = strdup("");
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for (i=0; i<n_commands; i++) {
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char* origstr = command_string;
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asprintf(&command_string, "%s %s", origstr, argv[i]);
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free(origstr);
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}
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char* origstr = command_string;
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asprintf(&command_string, "ssh %s \'%s & echo $! &\'", ipaddr, origstr);
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free(origstr);
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FILE *fp;
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char output[1024];
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// Open the command for reading
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fp = popen(command_string, "r");
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if (fp == NULL) {
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return -1;
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}
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// Read the output a line at a time
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fgets(output, sizeof(output)-1, fp);
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// Close output
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pclose(fp);
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free(command_string);
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return atoi(output);
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}
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char* raptor_sm_server_started(char* username, pid_t pid, int display) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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long long timestamp = time(NULL);
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connect_if_needed();
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if (!conn) {
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return -1;
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}
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// Update new information into the sessions database and set status to ALLOCATED
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "UPDATE sessions SET pid='%d', stamp_start='%lld', state='%d', display='%d', stamp_statechange='%lld' WHERE username='%s' AND state='%d'", pid, timestamp, SM_STATUS_RUNNING, display, timestamp, safe_username, SM_STATUS_ALLOCATED);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return -2;
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}
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else {
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free(query);
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return 0;
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}
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}
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int raptor_sm_get_display_for_username(char* username) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return -1;
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}
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char* safe_username = get_mysql_escaped_string(conn, username);
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asprintf(&query, "SELECT display FROM sessions WHERE username='%s'", safe_username);
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free(safe_username);
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return -2;
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}
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else {
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free(query);
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res = mysql_store_result(conn);
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while ((row = mysql_fetch_row(res)) != NULL) {
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if (row[0]) {
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int ret = atoi(row[0]);
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mysql_free_result(res);
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return ret;
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}
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else {
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mysql_free_result(res);
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return -3;
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}
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}
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// Nothing in the DB
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mysql_free_result(res);
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return -4;
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}
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}
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void raptor_sm_wait_for_pid_exit(char* username, pid_t pid) {
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char* ipaddr = raptor_sm_get_ip_for_username(username, false);
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char* command_string;
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asprintf(&command_string, "ssh %s \'while [[ `ps -p %d | grep %d` != \"\" ]]; do sleep 1; done\'", ipaddr, pid, pid);
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system(command_string);
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free(command_string);
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}
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void raptor_sm_session_terminated(char* username) {
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raptor_sm_deallocate_session(username);
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}
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int raptor_sm_get_new_unique_display(int mindisplay, int maxdisplay) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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connect_if_needed();
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if (!conn) {
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return -1;
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}
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asprintf(&query, "SELECT display FROM sessions");
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if (mysql_query(conn, query)) {
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// Server error
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free(query);
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return -2;
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}
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else {
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res = mysql_store_result(conn);
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int freedisp;
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bool dispinuse;
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for (freedisp=mindisplay; freedisp<maxdisplay; freedisp++) {
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dispinuse = false;
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mysql_data_seek(res, 0);
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while ((row = mysql_fetch_row(res)) != NULL) {
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if (row[0]) {
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if (atoi(row[0]) == freedisp) {
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dispinuse = true;
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}
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}
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}
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if (dispinuse == false) {
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break;
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}
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}
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mysql_free_result(res);
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return freedisp;
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}
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}
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char raptor_sm_set_session_state(int display, int state) {
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MYSQL_RES *res;
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MYSQL_ROW row;
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char* query;
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long long timestamp = time(NULL);
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connect_if_needed();
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if (!conn) {
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return -1;
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}
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// Update new state into the sessions database
|
|
asprintf(&query, "UPDATE sessions SET state='%d', stamp_statechange='%lld' WHERE display='%d'", state, timestamp, display);
|
|
if (mysql_query(conn, query)) {
|
|
// Server error
|
|
free(query);
|
|
return -2;
|
|
}
|
|
else {
|
|
free(query);
|
|
return 0;
|
|
}
|
|
} |