[24250] | 1 | /* $Id: mr_scall.c,v 1.40 2009-12-29 17:29:33 zacheiss Exp $ |
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[23095] | 2 | * |
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| 3 | * Do RPC |
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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 | #include "query.h" |
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| 14 | |
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| 15 | #include <sys/stat.h> |
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| 16 | #include <sys/types.h> |
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| 17 | |
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| 18 | #include <arpa/inet.h> |
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| 19 | #include <netinet/in.h> |
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| 20 | |
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| 21 | #include <errno.h> |
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| 22 | #include <fcntl.h> |
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| 23 | #include <stdlib.h> |
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| 24 | #include <string.h> |
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[24250] | 25 | #include <time.h> |
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[23095] | 26 | #include <unistd.h> |
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| 27 | |
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[24250] | 28 | RCSID("$Header: /afs/.athena.mit.edu/astaff/project/moiradev/repository/moira/server/mr_scall.c,v 1.40 2009-12-29 17:29:33 zacheiss Exp $"); |
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[23095] | 29 | |
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| 30 | extern int nclients; |
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| 31 | extern client **clients; |
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| 32 | extern char *whoami; |
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| 33 | |
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| 34 | extern int dbms_errno, mr_errcode; |
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| 35 | |
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| 36 | int max_version; |
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| 37 | |
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| 38 | void do_call(client *cl); |
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| 39 | void free_rtn_tuples(client *cp); |
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| 40 | int retr_callback(int argc, char **argv, void *p_cl); |
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| 41 | int list_users(client *cl); |
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| 42 | void do_retr(client *cl); |
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| 43 | void do_access(client *cl); |
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| 44 | void get_motd(client *cl); |
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| 45 | void do_version(client *cl); |
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| 46 | |
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| 47 | char *procnames[] = { |
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| 48 | "noop", |
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| 49 | "auth", |
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| 50 | "shutdown", |
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| 51 | "query", |
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| 52 | "access", |
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| 53 | "dcm", |
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| 54 | "motd", |
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| 55 | "proxy", |
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| 56 | "version", |
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| 57 | "auth_krb5", |
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| 58 | }; |
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| 59 | |
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| 60 | int newqueries; |
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| 61 | |
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| 62 | void client_read(client *cl) |
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| 63 | { |
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| 64 | int status, pn; |
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| 65 | |
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| 66 | status = mr_cont_receive(cl->con, &cl->req); |
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| 67 | if (status == -1) |
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| 68 | return; |
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| 69 | else if (status != MR_SUCCESS) |
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| 70 | { |
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| 71 | cl->state = CL_CLOSING; |
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| 72 | if (status != MR_NOT_CONNECTED) |
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| 73 | com_err(whoami, status, "while reading from socket"); |
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| 74 | return; |
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| 75 | } |
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| 76 | |
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| 77 | pn = cl->req.u.mr_procno; |
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| 78 | if (pn < 0 || pn > MR_MAX_PROC) |
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| 79 | { |
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| 80 | com_err(whoami, 0, "procno out of range"); |
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| 81 | client_reply(cl, MR_UNKNOWN_PROC); |
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| 82 | goto out; |
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| 83 | } |
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| 84 | log_args(procnames[pn], 2, cl->req.mr_argc, cl->req.mr_argv); |
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| 85 | |
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| 86 | if (dormant == ASLEEP && pn != MR_NOOP && pn != MR_MOTD) |
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| 87 | { |
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| 88 | client_reply(cl, MR_DOWN); |
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| 89 | com_err(whoami, MR_DOWN, "(query refused)"); |
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| 90 | goto out; |
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| 91 | } |
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| 92 | |
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| 93 | /* make sure this gets cleared before every operation */ |
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| 94 | dbms_errno = 0; |
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| 95 | |
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| 96 | switch (pn) |
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| 97 | { |
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| 98 | case MR_NOOP: |
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| 99 | client_reply(cl, MR_SUCCESS); |
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| 100 | break; |
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| 101 | |
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| 102 | case MR_AUTH: |
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| 103 | do_auth(cl); |
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| 104 | break; |
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| 105 | |
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| 106 | case MR_QUERY: |
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| 107 | do_retr(cl); |
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| 108 | break; |
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| 109 | |
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| 110 | case MR_ACCESS: |
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| 111 | do_access(cl); |
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| 112 | break; |
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| 113 | |
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| 114 | case MR_SHUTDOWN: |
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| 115 | do_shutdown(cl); |
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| 116 | break; |
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| 117 | |
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| 118 | case MR_DO_UPDATE: |
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| 119 | client_reply(cl, MR_PERM); |
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| 120 | break; |
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| 121 | |
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| 122 | case MR_MOTD: |
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| 123 | get_motd(cl); |
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| 124 | break; |
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| 125 | |
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| 126 | case MR_PROXY: |
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| 127 | do_proxy(cl); |
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| 128 | break; |
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| 129 | |
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| 130 | case MR_SETVERSION: |
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| 131 | do_version(cl); |
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| 132 | break; |
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| 133 | |
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| 134 | case MR_KRB5_AUTH: |
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| 135 | do_krb5_auth(cl); |
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| 136 | break; |
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| 137 | |
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| 138 | } |
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| 139 | |
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| 140 | out: |
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| 141 | mr_destroy_reply(cl->req); |
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| 142 | memset(&cl->req, 0, sizeof(mr_params)); |
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| 143 | } |
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| 144 | |
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| 145 | /* Set the final return status for a query. We always keep one more |
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| 146 | free slot in cl->tuples[] than we're using so that this can't fail */ |
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| 147 | void client_reply(client *cl, long status) |
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| 148 | { |
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| 149 | cl->tuples[cl->ntuples].u.mr_status = status; |
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| 150 | cl->tuples[cl->ntuples].mr_argc = 0; |
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| 151 | cl->tuples[cl->ntuples].mr_argl = NULL; |
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| 152 | cl->tuples[cl->ntuples].mr_argv = NULL; |
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| 153 | cl->ntuples++; |
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| 154 | } |
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| 155 | |
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| 156 | void client_return_tuple(client *cl, int argc, char **argv) |
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| 157 | { |
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| 158 | if (cl->state == CL_CLOSING || dbms_errno) |
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| 159 | return; |
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| 160 | |
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| 161 | if (cl->ntuples == cl->tuplessize - 1) |
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| 162 | { |
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| 163 | int newsize = (cl->tuplessize + 4) * 2; |
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| 164 | mr_params *newtuples; |
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| 165 | |
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| 166 | newtuples = realloc(cl->tuples, newsize * sizeof(mr_params)); |
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| 167 | if (!newtuples) |
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| 168 | { |
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| 169 | free_rtn_tuples(cl); |
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| 170 | dbms_errno = mr_errcode = MR_NO_MEM; |
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| 171 | return; |
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| 172 | } |
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| 173 | cl->tuplessize = newsize; |
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| 174 | cl->tuples = newtuples; |
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| 175 | } |
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| 176 | |
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| 177 | cl->tuples[cl->ntuples].u.mr_status = MR_MORE_DATA; |
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| 178 | cl->tuples[cl->ntuples].mr_argc = argc; |
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| 179 | cl->tuples[cl->ntuples].mr_argl = NULL; |
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| 180 | cl->tuples[cl->ntuples].mr_argv = mr_copy_args(argv, argc); |
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| 181 | cl->ntuples++; |
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| 182 | } |
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| 183 | |
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| 184 | void client_write(client *cl) |
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| 185 | { |
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| 186 | int status; |
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| 187 | |
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| 188 | status = mr_send(cl->con, &cl->tuples[cl->nexttuple]); |
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| 189 | if (status) |
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| 190 | { |
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| 191 | com_err(whoami, status, "writing to socket"); |
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| 192 | cl->state = CL_CLOSING; |
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| 193 | } |
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| 194 | else |
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| 195 | { |
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| 196 | cl->nexttuple++; |
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| 197 | if (cl->nexttuple == cl->ntuples) |
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| 198 | free_rtn_tuples(cl); |
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| 199 | } |
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| 200 | } |
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| 201 | |
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| 202 | void free_rtn_tuples(client *cl) |
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| 203 | { |
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| 204 | for (cl->ntuples--; cl->ntuples >= 0; cl->ntuples--) |
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| 205 | free_argv(cl->tuples[cl->ntuples].mr_argv, |
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| 206 | cl->tuples[cl->ntuples].mr_argc); |
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| 207 | free(cl->tuples); |
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| 208 | |
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| 209 | cl->tuples = xmalloc(sizeof(mr_params)); |
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| 210 | cl->tuplessize = 1; |
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| 211 | cl->ntuples = cl->nexttuple = 0; |
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| 212 | } |
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| 213 | |
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| 214 | void do_retr(client *cl) |
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| 215 | { |
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| 216 | char *queryname; |
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| 217 | int status; |
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| 218 | |
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| 219 | if (cl->req.mr_argc < 1) |
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| 220 | { |
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| 221 | client_reply(cl, MR_ARGS); |
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| 222 | com_err(whoami, MR_ARGS, "got nameless query"); |
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| 223 | return; |
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| 224 | } |
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| 225 | queryname = cl->req.mr_argv[0]; |
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| 226 | newqueries++; |
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| 227 | |
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| 228 | if (!strcmp(queryname, "_list_users")) |
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| 229 | status = list_users(cl); |
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| 230 | else |
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| 231 | status = mr_process_query(cl, queryname, cl->req.mr_argc - 1, |
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| 232 | cl->req.mr_argv + 1, retr_callback, cl); |
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| 233 | |
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| 234 | client_reply(cl, status); |
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| 235 | |
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| 236 | com_err(whoami, 0, "Query complete."); |
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| 237 | } |
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| 238 | |
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| 239 | int retr_callback(int argc, char **argv, void *p_cl) |
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| 240 | { |
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| 241 | client *cl = p_cl; |
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| 242 | |
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| 243 | mr_trim_args(argc, argv); |
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| 244 | client_return_tuple(cl, argc, argv); |
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| 245 | } |
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| 246 | |
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| 247 | void do_access(client *cl) |
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| 248 | { |
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| 249 | int status; |
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| 250 | |
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| 251 | if (cl->req.mr_argc < 1) |
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| 252 | { |
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| 253 | client_reply(cl, MR_ARGS); |
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| 254 | com_err(whoami, MR_ARGS, "got nameless access"); |
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| 255 | return; |
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| 256 | } |
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| 257 | |
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| 258 | status = mr_check_access(cl, cl->req.mr_argv[0], cl->req.mr_argc - 1, |
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| 259 | cl->req.mr_argv + 1); |
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| 260 | client_reply(cl, status); |
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| 261 | |
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| 262 | com_err(whoami, 0, "Access check complete."); |
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| 263 | } |
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| 264 | |
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| 265 | void do_version(client *cl) |
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| 266 | { |
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| 267 | if (cl->req.mr_argc != 1) |
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| 268 | { |
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| 269 | client_reply(cl, MR_ARGS); |
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| 270 | com_err(whoami, MR_ARGS, "incorrect number of arguments"); |
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| 271 | return; |
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| 272 | } |
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| 273 | |
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| 274 | cl->version = atoi(cl->req.mr_argv[0]); |
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| 275 | if (cl->version == -1) |
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| 276 | cl->version = max_version; |
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| 277 | |
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| 278 | client_reply(cl, cl->version == max_version ? MR_SUCCESS : |
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| 279 | cl->version < max_version ? MR_VERSION_LOW : MR_VERSION_HIGH); |
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| 280 | } |
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| 281 | |
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| 282 | void get_motd(client *cl) |
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| 283 | { |
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| 284 | int motd; |
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| 285 | char *buffer; |
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| 286 | struct stat statb; |
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| 287 | |
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| 288 | if (stat(MOIRA_MOTD_FILE, &statb) == -1) |
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| 289 | { |
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| 290 | client_reply(cl, MR_SUCCESS); |
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| 291 | return; |
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| 292 | } |
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| 293 | |
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| 294 | buffer = malloc(statb.st_size + 1); |
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| 295 | if (!buffer) |
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| 296 | { |
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| 297 | client_reply(cl, MR_NO_MEM); |
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| 298 | return; |
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| 299 | } |
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| 300 | |
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| 301 | motd = open(MOIRA_MOTD_FILE, 0, O_RDONLY); |
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| 302 | if (motd) |
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| 303 | { |
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| 304 | read(motd, buffer, statb.st_size); |
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| 305 | close(motd); |
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| 306 | buffer[statb.st_size] = '\0'; |
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| 307 | client_return_tuple(cl, 1, &buffer); |
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| 308 | client_reply(cl, MR_SUCCESS); |
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| 309 | } |
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| 310 | else |
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| 311 | client_reply(cl, errno); |
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| 312 | |
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| 313 | free(buffer); |
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| 314 | } |
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| 315 | |
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| 316 | int list_users(client *cl) |
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| 317 | { |
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| 318 | char *argv[5]; |
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| 319 | char buf[30]; |
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| 320 | char buf1[30]; |
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| 321 | int i; |
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| 322 | char *cp; |
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| 323 | |
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| 324 | for (i = 0; i < nclients; i++) |
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| 325 | { |
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| 326 | client *c = clients[i]; |
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| 327 | argv[0] = c->clname; |
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| 328 | argv[1] = inet_ntoa(c->haddr.sin_addr); |
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| 329 | argv[2] = buf; |
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| 330 | sprintf(buf, "port %d", ntohs(c->haddr.sin_port)); |
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| 331 | argv[3] = ctime(&c->last_time_used); |
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| 332 | cp = strchr(argv[3], '\n'); |
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| 333 | if (cp) |
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| 334 | *cp = '\0'; |
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| 335 | argv[4] = buf1; |
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| 336 | sprintf(buf1, "[#%d]", c->id); |
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| 337 | client_return_tuple(cl, 5, argv); |
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| 338 | } |
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| 339 | return MR_SUCCESS; |
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| 340 | } |
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| 341 | |
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