| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Common definitions for YAID |
| 4 | * |
| 5 | * (c) 2012 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Yet Another Ident Daemon (YAID). |
| 11 | * |
| 12 | * YAID is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * YAID is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with YAID; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | #ifndef YAID_H |
| 28 | #define YAID_H |
| 29 | |
| 30 | #ifdef __cplusplus |
| 31 | extern "C" { |
| 32 | #endif |
| 33 | |
| 34 | /*----- Header files ------------------------------------------------------*/ |
| 35 | |
| 36 | #include "config.h" |
| 37 | |
| 38 | #include <assert.h> |
| 39 | #include <ctype.h> |
| 40 | #include <errno.h> |
| 41 | #include <limits.h> |
| 42 | #include <stdarg.h> |
| 43 | #include <stdio.h> |
| 44 | #include <string.h> |
| 45 | #include <string.h> |
| 46 | |
| 47 | #include <sys/types.h> |
| 48 | #include <unistd.h> |
| 49 | #include <fcntl.h> |
| 50 | |
| 51 | #include <pwd.h> |
| 52 | |
| 53 | #include <sys/socket.h> |
| 54 | #include <netinet/in.h> |
| 55 | #include <arpa/inet.h> |
| 56 | |
| 57 | #include <syslog.h> |
| 58 | |
| 59 | #include <mLib/bits.h> |
| 60 | #include <mLib/conn.h> |
| 61 | #include <mLib/darray.h> |
| 62 | #include <mLib/dstr.h> |
| 63 | #include <mLib/fdflags.h> |
| 64 | #include <mLib/fwatch.h> |
| 65 | #include <mLib/quis.h> |
| 66 | #include <mLib/report.h> |
| 67 | #include <mLib/sel.h> |
| 68 | #include <mLib/selbuf.h> |
| 69 | |
| 70 | /*----- System specifics --------------------------------------------------*/ |
| 71 | |
| 72 | #define SYS_UNDEF 0 |
| 73 | #define SYS_LINUX 1 |
| 74 | |
| 75 | #if SYS == SYS_LINUX |
| 76 | # include <linux/netlink.h> |
| 77 | # include <linux/rtnetlink.h> |
| 78 | #else |
| 79 | # error "Unsupported operating system: sorry. Patches welcome!" |
| 80 | #endif |
| 81 | |
| 82 | /*----- Data structures ---------------------------------------------------*/ |
| 83 | |
| 84 | #define ADDRLEN 64 |
| 85 | |
| 86 | union addr { |
| 87 | struct in_addr ipv4; |
| 88 | struct in6_addr ipv6; |
| 89 | }; |
| 90 | |
| 91 | struct socket { |
| 92 | union addr addr; |
| 93 | unsigned port; |
| 94 | }; |
| 95 | |
| 96 | struct addrpat { |
| 97 | unsigned len; |
| 98 | union addr addr; |
| 99 | }; |
| 100 | |
| 101 | struct portpat { |
| 102 | unsigned lo, hi; |
| 103 | }; |
| 104 | |
| 105 | struct sockpat { |
| 106 | struct addrpat addr; |
| 107 | struct portpat port; |
| 108 | }; |
| 109 | |
| 110 | #define ADDRTYPES(_) \ |
| 111 | _(ipv4, IPV4) \ |
| 112 | _(ipv6, IPV6) |
| 113 | |
| 114 | struct addrops { |
| 115 | int af; |
| 116 | const char *name; |
| 117 | unsigned len; |
| 118 | const union addr *any; |
| 119 | const struct addrops_sys *sys; |
| 120 | int (*addreq)(const union addr *, const union addr *); |
| 121 | int (*match_addrpat)(const struct addrpat *, const union addr *); |
| 122 | void (*socket_to_sockaddr)(const struct socket *s, void *, size_t *); |
| 123 | void (*sockaddr_to_addr)(const void *, union addr *); |
| 124 | int (*init_listen_socket)(int); |
| 125 | }; |
| 126 | |
| 127 | enum { |
| 128 | #define DEFADDR(ty, TY) ADDR_##TY, |
| 129 | ADDRTYPES(DEFADDR) |
| 130 | #undef DEFADDR |
| 131 | ADDR_LIMIT |
| 132 | }; |
| 133 | |
| 134 | extern const struct addrops addroptab[]; |
| 135 | #define OPS_SYS(ty, TY) \ |
| 136 | extern const struct addrops_sys addrops_sys_##ty; |
| 137 | ADDRTYPES(OPS_SYS) |
| 138 | #undef OPS_SYS |
| 139 | |
| 140 | enum { L, R, NDIR }; |
| 141 | |
| 142 | #define RESPONSE(_) \ |
| 143 | _(ERROR, U(error, unsigned)) \ |
| 144 | _(UID, U(uid, uid_t)) \ |
| 145 | _(NAT, U(nat, struct socket)) |
| 146 | |
| 147 | #define ERROR(_) \ |
| 148 | _(INVPORT, "INVALID-PORT") \ |
| 149 | _(NOUSER, "NO-USER") \ |
| 150 | _(HIDDEN, "HIDDEN-USER") \ |
| 151 | _(UNKNOWN, "UNKNOWN-ERROR") |
| 152 | extern const char *const errtok[]; |
| 153 | |
| 154 | enum { |
| 155 | #define DEFENUM(err, tok) E_##err, |
| 156 | ERROR(DEFENUM) |
| 157 | #undef DEFENUM |
| 158 | E_LIMIT |
| 159 | }; |
| 160 | |
| 161 | enum { |
| 162 | #define DEFENUM(what, branch) R_##what, |
| 163 | RESPONSE(DEFENUM) |
| 164 | #undef DEFENUM |
| 165 | R_LIMIT |
| 166 | }; |
| 167 | |
| 168 | struct query { |
| 169 | const struct addrops *ao; |
| 170 | struct socket s[NDIR]; |
| 171 | unsigned resp; |
| 172 | union { |
| 173 | #define DEFBRANCH(WHAT, branch) branch |
| 174 | #define U(memb, ty) ty memb; |
| 175 | #define N |
| 176 | RESPONSE(DEFBRANCH) |
| 177 | #undef U |
| 178 | #undef N |
| 179 | #undef DEFBRANCH |
| 180 | } u; |
| 181 | } query; |
| 182 | |
| 183 | enum { |
| 184 | T_OK, |
| 185 | T_EOL, |
| 186 | T_EOF, |
| 187 | T_ERROR |
| 188 | }; |
| 189 | |
| 190 | #define ACTIONS(_) \ |
| 191 | _(USER, "user") \ |
| 192 | _(TOKEN, "token") \ |
| 193 | _(NAME, "name") \ |
| 194 | _(DENY, "deny") \ |
| 195 | _(HIDE, "hide") \ |
| 196 | _(LIE, "lie") |
| 197 | |
| 198 | enum { |
| 199 | #define DEFENUM(tag, word) A_##tag, |
| 200 | ACTIONS(DEFENUM) |
| 201 | #undef DEFENUM |
| 202 | A_LIMIT |
| 203 | }; |
| 204 | |
| 205 | struct action { |
| 206 | unsigned act; |
| 207 | union { |
| 208 | unsigned user; |
| 209 | char *lie; |
| 210 | } u; |
| 211 | }; |
| 212 | |
| 213 | struct policy { |
| 214 | const struct addrops *ao; |
| 215 | struct sockpat sp[NDIR]; |
| 216 | struct action act; |
| 217 | }; |
| 218 | #define POLICY_INIT(a) { 0, { { { 0 } } }, { a } } |
| 219 | |
| 220 | struct policy_file { |
| 221 | FILE *fp; |
| 222 | const struct query *q; |
| 223 | const char *name; |
| 224 | const char *what; |
| 225 | int err; |
| 226 | int lno; |
| 227 | struct policy p; |
| 228 | }; |
| 229 | |
| 230 | DA_DECL(policy_v, struct policy); |
| 231 | |
| 232 | /*----- Functions provided ------------------------------------------------*/ |
| 233 | |
| 234 | int sockeq(const struct addrops *ao, |
| 235 | const struct socket *sa, const struct socket *sb); |
| 236 | void dputsock(dstr *d, const struct addrops *ao, const struct socket *s); |
| 237 | |
| 238 | void logmsg(const struct query *q, int prio, const char *msg, ...); |
| 239 | |
| 240 | void identify(struct query *q); |
| 241 | void init_sys(void); |
| 242 | |
| 243 | void init_policy(struct policy *p); |
| 244 | void free_policy(struct policy *p); |
| 245 | void print_policy(const struct policy *p); |
| 246 | int match_policy(const struct policy *p, const struct query *q); |
| 247 | int parse_policy(FILE *fp, struct policy *p); |
| 248 | int open_policy_file(struct policy_file *pf, const char *name, |
| 249 | const char *what, const struct query *q); |
| 250 | int read_policy_file(struct policy_file *pf); |
| 251 | void close_policy_file(struct policy_file *pf); |
| 252 | int load_policy_file(const char *file, policy_v *pv); |
| 253 | |
| 254 | /*----- That's all, folks -------------------------------------------------*/ |
| 255 | |
| 256 | #ifdef __cplusplus |
| 257 | } |
| 258 | #endif |
| 259 | |
| 260 | #endif |