[23882] | 1 | /* $Id: mr_main.c,v 1.56 2009-06-01 21:05:02 zacheiss Exp $ |
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[23095] | 2 | * |
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| 3 | * Moira server process. |
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| 4 | * |
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| 5 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology |
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| 6 | * For copying and distribution information, please see the file |
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| 7 | * <mit-copyright.h>. |
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| 8 | * |
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| 9 | */ |
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| 10 | |
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| 11 | #include <mit-copyright.h> |
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| 12 | #include "mr_server.h" |
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| 13 | |
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| 14 | #include <sys/socket.h> |
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| 15 | #include <sys/stat.h> |
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| 16 | #include <sys/types.h> |
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| 17 | #include <sys/utsname.h> |
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| 18 | #include <sys/wait.h> |
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| 19 | |
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| 20 | #include <netinet/in.h> |
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| 21 | #include <arpa/inet.h> |
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| 22 | |
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| 23 | #include <ctype.h> |
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| 24 | #include <errno.h> |
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| 25 | #include <signal.h> |
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| 26 | #include <stdio.h> |
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| 27 | #include <stdlib.h> |
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| 28 | #include <string.h> |
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| 29 | #include <unistd.h> |
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| 30 | |
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[23882] | 31 | #ifdef HAVE_KRB4 |
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[23095] | 32 | #include <krb.h> |
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[23882] | 33 | #endif |
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[23095] | 34 | #include <krb5.h> |
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| 35 | |
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[23882] | 36 | RCSID("$Header: /afs/athena.mit.edu/astaff/project/moiradev/repository/moira/server/mr_main.c,v 1.56 2009-06-01 21:05:02 zacheiss Exp $"); |
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[23095] | 37 | |
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| 38 | client *cur_client; |
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| 39 | |
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| 40 | char *whoami; |
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| 41 | char *takedown; |
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| 42 | FILE *journal; |
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| 43 | |
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| 44 | time_t now; |
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| 45 | |
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| 46 | char *host; |
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| 47 | krb5_context context = NULL; |
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[23882] | 48 | char *krb_realm = NULL; |
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[23095] | 49 | |
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| 50 | /* Client array and associated data. This needs to be global for _list_users */ |
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| 51 | client **clients; |
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| 52 | int nclients, clientssize; |
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| 53 | |
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| 54 | int dormant; |
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| 55 | int child_exited_abnormally = 0; |
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| 56 | int child_pid, child_signal, child_status; |
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| 57 | |
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| 58 | void reapchild(int x); |
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| 59 | void godormant(int x); |
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| 60 | void gowakeup(int x); |
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| 61 | void clist_append(client *cp); |
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| 62 | void mr_setup_signals(void); |
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| 63 | |
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| 64 | /* |
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| 65 | * Main Moira server loop. |
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| 66 | * |
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| 67 | * Initialize the world, then start accepting connections and |
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| 68 | * making progress on current connections. |
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| 69 | */ |
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| 70 | |
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| 71 | int main(int argc, char **argv) |
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| 72 | { |
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| 73 | int status, i, listener; |
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| 74 | time_t tardy; |
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| 75 | char *port, *p; |
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| 76 | extern char *database; |
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| 77 | struct stat stbuf; |
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| 78 | struct utsname uts; |
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| 79 | fd_set readfds, writefds, xreadfds, xwritefds; |
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| 80 | int nfds, counter = 0; |
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| 81 | |
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| 82 | whoami = argv[0]; |
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| 83 | /* |
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| 84 | * Error handler init. |
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| 85 | */ |
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| 86 | mr_init(); |
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| 87 | set_com_err_hook(mr_com_err); |
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| 88 | setvbuf(stderr, NULL, _IOLBF, BUFSIZ); |
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| 89 | |
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| 90 | port = strchr(MOIRA_SERVER, ':') + 1; |
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| 91 | |
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| 92 | for (i = 1; i < argc; i++) |
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| 93 | { |
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| 94 | if (!strcmp(argv[i], "-db") && i + 1 < argc) |
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| 95 | { |
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| 96 | database = argv[i + 1]; |
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| 97 | i++; |
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| 98 | } |
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| 99 | else if (!strcmp(argv[i], "-p") && i + 1 < argc) |
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| 100 | { |
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| 101 | port = argv[i + 1]; |
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| 102 | i++; |
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| 103 | } |
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| 104 | else |
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| 105 | { |
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| 106 | com_err(whoami, 0, "Usage: moirad [-db database][-p port]"); |
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| 107 | exit(1); |
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| 108 | } |
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| 109 | } |
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| 110 | |
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| 111 | status = krb5_init_context(&context); |
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| 112 | if (status) |
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| 113 | { |
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| 114 | com_err(whoami, status, "Initializing krb5 context."); |
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| 115 | exit(1); |
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| 116 | } |
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| 117 | |
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[23882] | 118 | status = krb5_get_default_realm(context, &krb_realm); |
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| 119 | if (status) |
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| 120 | { |
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| 121 | com_err(whoami, status, "Getting default Kerberos realm."); |
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| 122 | exit(1); |
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| 123 | } |
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| 124 | |
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[23095] | 125 | /* |
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| 126 | * Database initialization. Only init if database should be open. |
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| 127 | */ |
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| 128 | |
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| 129 | if (stat(MOIRA_MOTD_FILE, &stbuf) != 0) |
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| 130 | { |
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| 131 | if ((status = mr_open_database())) |
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| 132 | { |
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| 133 | com_err(whoami, status, "trying to open database."); |
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| 134 | exit(1); |
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| 135 | } |
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| 136 | sanity_check_database(); |
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| 137 | } |
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| 138 | else |
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| 139 | { |
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| 140 | dormant = ASLEEP; |
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| 141 | com_err(whoami, 0, "sleeping, not opening database"); |
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| 142 | } |
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| 143 | |
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| 144 | sanity_check_queries(); |
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| 145 | |
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| 146 | /* |
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| 147 | * Get moira server hostname for authentication |
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| 148 | */ |
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| 149 | if (uname(&uts) < 0) |
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| 150 | { |
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| 151 | com_err(whoami, errno, "Unable to get local hostname"); |
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| 152 | exit(1); |
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| 153 | } |
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| 154 | host = canonicalize_hostname(xstrdup(uts.nodename)); |
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| 155 | for (p = host; *p && *p != '.'; p++) |
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| 156 | { |
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| 157 | if (isupper(*p)) |
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| 158 | *p = tolower(*p); |
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| 159 | } |
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| 160 | *p = '\0'; |
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| 161 | |
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| 162 | /* |
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| 163 | * Set up client array handler. |
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| 164 | */ |
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| 165 | nclients = 0; |
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| 166 | clientssize = 10; |
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| 167 | clients = xmalloc(clientssize * sizeof(client *)); |
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| 168 | |
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| 169 | mr_setup_signals(); |
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| 170 | |
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| 171 | journal = fopen(JOURNAL, "a"); |
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| 172 | if (!journal) |
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| 173 | { |
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| 174 | com_err(whoami, errno, "opening journal file"); |
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| 175 | exit(1); |
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| 176 | } |
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| 177 | |
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| 178 | /* |
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| 179 | * Establish template connection. |
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| 180 | */ |
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| 181 | listener = mr_listen(port); |
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| 182 | if (listener == -1) |
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| 183 | { |
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| 184 | com_err(whoami, MR_ABORTED, "trying to create listening connection"); |
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| 185 | exit(1); |
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| 186 | } |
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| 187 | FD_ZERO(&xreadfds); |
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| 188 | FD_ZERO(&xwritefds); |
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| 189 | FD_SET(listener, &xreadfds); |
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| 190 | nfds = listener + 1; |
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| 191 | |
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| 192 | com_err(whoami, 0, "started (pid %d)", getpid()); |
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| 193 | com_err(whoami, 0, rcsid); |
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| 194 | if (dormant != ASLEEP) |
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| 195 | send_zgram("MOIRA", "server started"); |
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| 196 | else |
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| 197 | send_zgram("MOIRA", "server started, but database closed"); |
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| 198 | |
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| 199 | /* |
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| 200 | * Run until shut down. |
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| 201 | */ |
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| 202 | while (!takedown) |
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| 203 | { |
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| 204 | int i; |
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| 205 | struct timeval timeout = {60, 0}; /* 1 minute */ |
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| 206 | |
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| 207 | /* If we're supposed to go down and we can, do it */ |
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| 208 | if (((dormant == AWAKE) && (nclients == 0) && |
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| 209 | (stat(MOIRA_MOTD_FILE, &stbuf) == 0)) || |
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| 210 | (dormant == SLEEPY)) |
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| 211 | { |
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| 212 | mr_close_database(); |
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| 213 | com_err(whoami, 0, "database closed"); |
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| 214 | mr_setup_signals(); |
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| 215 | send_zgram("MOIRA", "database closed"); |
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| 216 | dormant = ASLEEP; |
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| 217 | } |
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| 218 | |
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| 219 | /* Block until something happens. */ |
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| 220 | memcpy(&readfds, &xreadfds, sizeof(readfds)); |
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| 221 | memcpy(&writefds, &xwritefds, sizeof(writefds)); |
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| 222 | if (select(nfds, &readfds, &writefds, NULL, &timeout) == -1) |
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| 223 | { |
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| 224 | if (errno != EINTR) |
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| 225 | com_err(whoami, errno, "in select"); |
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| 226 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
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| 227 | next_incremental(); |
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| 228 | continue; |
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| 229 | } |
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| 230 | |
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| 231 | if (takedown) |
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| 232 | break; |
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| 233 | |
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| 234 | if (child_exited_abnormally) |
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| 235 | { |
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[23882] | 236 | critical_alert(whoami, "moirad", "%d: child exits with signal %d status %d", |
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[23095] | 237 | child_pid, child_signal, child_status); |
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| 238 | child_exited_abnormally = 0; |
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| 239 | } |
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| 240 | |
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| 241 | time(&now); |
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| 242 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
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| 243 | next_incremental(); |
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| 244 | tardy = now - 30 * 60; |
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| 245 | |
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| 246 | /* If we're asleep and we should wake up, do it */ |
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| 247 | if ((dormant == ASLEEP) && (stat(MOIRA_MOTD_FILE, &stbuf) == -1) && |
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| 248 | (errno == ENOENT)) |
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| 249 | { |
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| 250 | mr_open_database(); |
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| 251 | com_err(whoami, 0, "database open"); |
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| 252 | mr_setup_signals(); |
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| 253 | send_zgram("MOIRA", "database open again"); |
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| 254 | dormant = AWAKE; |
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| 255 | } |
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| 256 | |
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| 257 | /* Handle any new connections */ |
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| 258 | if (FD_ISSET(listener, &readfds)) |
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| 259 | { |
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| 260 | int newconn, addrlen = sizeof(struct sockaddr_in); |
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| 261 | struct sockaddr_in addr; |
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| 262 | client *cp; |
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| 263 | |
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| 264 | newconn = accept(listener, (struct sockaddr *)&addr, &addrlen); |
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| 265 | if (newconn == -1) |
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| 266 | com_err(whoami, errno, "accepting new connection"); |
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| 267 | else if (newconn > 0) |
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| 268 | { |
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| 269 | if (newconn + 1 > nfds) |
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| 270 | nfds = newconn + 1; |
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| 271 | FD_SET(newconn, &xreadfds); |
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| 272 | |
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| 273 | /* Add a new client to the array */ |
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| 274 | nclients++; |
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| 275 | if (nclients > clientssize) |
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| 276 | { |
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| 277 | clientssize = 2 * clientssize; |
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| 278 | clients = xrealloc(clients, clientssize * sizeof(client *)); |
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| 279 | } |
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| 280 | |
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| 281 | clients[nclients - 1] = cp = xmalloc(sizeof(client)); |
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| 282 | memset(cp, 0, sizeof(client)); |
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| 283 | cp->con = newconn; |
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| 284 | cp->id = counter++; |
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| 285 | cp->last_time_used = now; |
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| 286 | cp->haddr = addr; |
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| 287 | cp->tuplessize = 1; |
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| 288 | cp->tuples = xmalloc(sizeof(mr_params)); |
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| 289 | memset(cp->tuples, 0, sizeof(mr_params)); |
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| 290 | cp->state = CL_ACCEPTING; |
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| 291 | cp->version = 2; |
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| 292 | |
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| 293 | cur_client = cp; |
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| 294 | com_err(whoami, 0, |
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| 295 | "New connection from %s port %d (now %d client%s)", |
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| 296 | inet_ntoa(cp->haddr.sin_addr), |
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| 297 | (int)ntohs(cp->haddr.sin_port), |
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| 298 | nclients, nclients != 1 ? "s" : ""); |
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| 299 | } |
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| 300 | } |
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| 301 | |
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| 302 | /* Handle any existing connections. */ |
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| 303 | for (i = 0; i < nclients; i++) |
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| 304 | { |
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| 305 | cur_client = clients[i]; |
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| 306 | |
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| 307 | if (FD_ISSET(clients[i]->con, &writefds)) |
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| 308 | { |
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| 309 | client_write(clients[i]); |
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| 310 | if (!clients[i]->ntuples) |
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| 311 | { |
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| 312 | FD_CLR(clients[i]->con, &xwritefds); |
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| 313 | FD_SET(clients[i]->con, &xreadfds); |
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| 314 | } |
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| 315 | clients[i]->last_time_used = now; |
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| 316 | } |
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| 317 | |
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| 318 | if (FD_ISSET(clients[i]->con, &readfds)) |
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| 319 | { |
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| 320 | if (clients[i]->state == CL_ACCEPTING) |
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| 321 | { |
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| 322 | switch(mr_cont_accept(clients[i]->con, |
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| 323 | &clients[i]->hsbuf, |
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| 324 | &clients[i]->hslen)) |
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| 325 | { |
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| 326 | case -1: |
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| 327 | break; |
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| 328 | |
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| 329 | case 0: |
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| 330 | clients[i]->state = CL_CLOSING; |
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| 331 | break; |
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| 332 | |
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| 333 | default: |
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| 334 | clients[i]->state = CL_ACTIVE; |
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| 335 | clients[i]->hsbuf = NULL; |
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| 336 | break; |
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| 337 | } |
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| 338 | } |
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| 339 | else |
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| 340 | { |
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| 341 | client_read(clients[i]); |
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| 342 | if (clients[i]->ntuples) |
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| 343 | { |
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| 344 | FD_CLR(clients[i]->con, &xreadfds); |
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| 345 | FD_SET(clients[i]->con, &xwritefds); |
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| 346 | } |
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| 347 | clients[i]->last_time_used = now; |
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| 348 | } |
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| 349 | } |
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| 350 | |
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| 351 | if (clients[i]->last_time_used < tardy) |
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| 352 | { |
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| 353 | com_err(whoami, 0, "Shutting down connection due to inactivity"); |
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| 354 | clients[i]->state = CL_CLOSING; |
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| 355 | } |
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| 356 | |
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| 357 | if (clients[i]->state == CL_CLOSING) |
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| 358 | { |
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| 359 | client *old; |
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| 360 | |
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| 361 | com_err(whoami, 0, "Closed connection (now %d client%s, " |
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| 362 | "%d queries)", nclients - 1, nclients != 2 ? "s" : "", |
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| 363 | newqueries); |
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| 364 | |
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| 365 | shutdown(clients[i]->con, 2); |
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| 366 | close(clients[i]->con); |
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| 367 | FD_CLR(clients[i]->con, &xreadfds); |
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| 368 | FD_CLR(clients[i]->con, &xwritefds); |
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| 369 | free_rtn_tuples(clients[i]); |
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| 370 | free(clients[i]->tuples); |
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| 371 | free(clients[i]->hsbuf); |
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| 372 | old = clients[i]; |
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| 373 | clients[i] = clients[--nclients]; |
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| 374 | free(old); |
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| 375 | } |
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| 376 | |
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| 377 | cur_client = NULL; |
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| 378 | if (takedown) |
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| 379 | break; |
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| 380 | } |
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| 381 | } |
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| 382 | |
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| 383 | com_err(whoami, 0, "%s", takedown); |
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| 384 | if (dormant != ASLEEP) |
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| 385 | mr_close_database(); |
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| 386 | send_zgram("MOIRA", takedown); |
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| 387 | return 0; |
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| 388 | } |
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| 389 | |
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| 390 | void reapchild(int x) |
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| 391 | { |
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| 392 | int status, pid; |
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| 393 | |
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| 394 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) |
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| 395 | { |
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| 396 | if (pid == inc_pid) |
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| 397 | inc_running = 0; |
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| 398 | if (!takedown && (WTERMSIG(status) != 0 || WEXITSTATUS(status) != 0)) |
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| 399 | { |
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| 400 | child_exited_abnormally = 1; |
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| 401 | child_pid = pid; |
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| 402 | child_signal = WTERMSIG(status); |
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| 403 | child_status = WEXITSTATUS(status); |
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| 404 | } |
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| 405 | } |
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| 406 | } |
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| 407 | |
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| 408 | |
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| 409 | void godormant(int x) |
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| 410 | { |
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| 411 | switch (dormant) |
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| 412 | { |
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| 413 | case AWAKE: |
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| 414 | case GROGGY: |
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| 415 | com_err(whoami, 0, "requested to go dormant"); |
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| 416 | break; |
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| 417 | case ASLEEP: |
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| 418 | com_err(whoami, 0, "already asleep"); |
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| 419 | break; |
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| 420 | case SLEEPY: |
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| 421 | break; |
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| 422 | } |
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| 423 | dormant = SLEEPY; |
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| 424 | } |
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| 425 | |
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| 426 | |
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| 427 | void gowakeup(int x) |
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| 428 | { |
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| 429 | switch (dormant) |
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| 430 | { |
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| 431 | case ASLEEP: |
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| 432 | case SLEEPY: |
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| 433 | com_err(whoami, 0, "Good morning"); |
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| 434 | break; |
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| 435 | case AWAKE: |
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| 436 | com_err(whoami, 0, "already awake"); |
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| 437 | break; |
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| 438 | case GROGGY: |
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| 439 | break; |
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| 440 | } |
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| 441 | dormant = GROGGY; |
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| 442 | } |
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| 443 | |
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| 444 | |
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| 445 | void mr_setup_signals(void) |
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| 446 | { |
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| 447 | struct sigaction action; |
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| 448 | |
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| 449 | action.sa_flags = 0; |
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| 450 | sigemptyset(&action.sa_mask); |
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| 451 | |
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| 452 | /* There should probably be a few more of these. */ |
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| 453 | |
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| 454 | action.sa_handler = sigshut; |
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| 455 | if ((sigaction(SIGTERM, &action, NULL) < 0) || |
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| 456 | (sigaction(SIGINT, &action, NULL) < 0) || |
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| 457 | (sigaction(SIGHUP, &action, NULL) < 0)) |
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| 458 | { |
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| 459 | com_err(whoami, errno, "Unable to establish signal handlers."); |
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| 460 | exit(1); |
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| 461 | } |
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| 462 | |
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| 463 | action.sa_handler = godormant; |
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| 464 | if (sigaction(SIGUSR1, &action, NULL) < 0) |
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| 465 | { |
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| 466 | com_err(whoami, errno, "Unable to establish signal handlers."); |
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| 467 | exit(1); |
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| 468 | } |
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| 469 | |
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| 470 | action.sa_handler = gowakeup; |
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| 471 | if (sigaction(SIGUSR2, &action, NULL) < 0) |
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| 472 | { |
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| 473 | com_err(whoami, errno, "Unable to establish signal handlers."); |
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| 474 | exit(1); |
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| 475 | } |
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| 476 | |
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| 477 | action.sa_handler = SIG_IGN; |
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| 478 | if (sigaction(SIGPIPE, &action, NULL) < 0) |
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| 479 | { |
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| 480 | com_err(whoami, errno, "Unable to establish signal handlers."); |
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| 481 | exit(1); |
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| 482 | } |
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| 483 | |
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| 484 | action.sa_handler = reapchild; |
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| 485 | sigaddset(&action.sa_mask, SIGCHLD); |
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| 486 | if (sigaction(SIGCHLD, &action, NULL) < 0) |
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| 487 | { |
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| 488 | com_err(whoami, errno, "Unable to establish signal handlers."); |
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| 489 | exit(1); |
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| 490 | } |
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| 491 | } |
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