1 /* 2 * Copyright 2014 Sachidananda Urs <sacchi@gmail.com> 3 * Copyright 2001 Sun Microsystems, Inc. All rights reserved. 4 * Use is subject to license terms. 5 */ 6 7 /* 8 * @(#) tcpd.h 1.5 96/03/19 16:22:24 9 * 10 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. 11 */ 12 13 #ifndef _TCPD_H 14 #define _TCPD_H 15 16 /* 17 * HAVE_IPV6 is traditionally configured at tcp_wrappers build time but for 18 * Solaris it must always be defined to keep the library interface binary 19 * compatible. 20 */ 21 #define HAVE_IPV6 22 23 /* Structure to describe one communications endpoint. */ 24 25 #define STRING_LENGTH 128 /* hosts, users, processes */ 26 27 #include <stdio_tag.h> 28 #include <sys/socket.h> 29 #include <netinet/in.h> 30 31 typedef struct sockaddr_gen { 32 union { 33 struct sockaddr _sg_sa; 34 struct sockaddr_in _sg_sin; 35 #ifdef HAVE_IPV6 36 struct sockaddr_in6 _sg_sin6; 37 #endif 38 } sg_addr; 39 } sockaddr_gen; 40 41 typedef union gen_addr { 42 struct in_addr ga_in; 43 #ifdef HAVE_IPV6 44 struct in6_addr ga_in6; 45 #endif 46 } gen_addr; 47 48 extern void sockgen_simplify(); 49 50 #define sg_sa sg_addr._sg_sa 51 #define sg_sin sg_addr._sg_sin 52 #define sg_sin6 sg_addr._sg_sin6 53 #define sg_family sg_sa.sa_family 54 #ifdef HAVE_IPV6 55 #define SGADDRSZ(sag) ((sag)->sg_family == AF_INET6 ? \ 56 sizeof (struct in6_addr) : \ 57 sizeof (struct in_addr)) 58 #define SGSOCKADDRSZ(sag) ((sag)->sg_family == AF_INET6 ? \ 59 sizeof (struct sockaddr_in6) : \ 60 sizeof (struct sockaddr_in)) 61 #define SGPORT(sag) (*((sag)->sg_family == AF_INET6 ? \ 62 &(sag)->sg_sin6.sin6_port : \ 63 &(sag)->sg_sin.sin_port)) 64 #define SGADDRP(sag) (((sag)->sg_family == AF_INET6 ? \ 65 (char *)&(sag)->sg_sin6.sin6_addr : \ 66 (char *)&(sag)->sg_sin.sin_addr)) 67 #define SGFAM(sag) ((sag)->sg_family == AF_INET6 ? \ 68 AF_INET6 : AF_INET) 69 70 #define SG_IS_UNSPECIFIED(sag) \ 71 ((sag)->sg_family == AF_INET6 ? \ 72 IN6_IS_ADDR_UNSPECIFIED(&(sag)->sg_sin6.sin6_addr) : \ 73 (sag)->sg_sin.sin_addr.s_addr == 0) 74 75 #define VALID_ADDRTYPE(t) ((t) == AF_INET || (t) == AF_INET6) 76 77 #ifndef IPV6_ABITS 78 #define IPV6_ABITS 128 /* Size of IPV6 address in bits */ 79 #endif 80 81 #else /* HAVE_IPV6 */ 82 83 #define SGADDRSZ(sag) sizeof (struct in_addr) 84 #define SGSOCKADDRSZ(sag) sizeof (struct sockaddr_in) 85 #define SGPORT(sag) ((sag)->sg_sin.sin_port) 86 #define SGADDRP(sag) ((char *)&(sag)->sg_sin.sin_addr) 87 #define SGFAM(sag) AF_INET 88 #define SG_IS_UNSPECIFIED(sag) ((sag)->sg_sin.sin_addr.s_addr == 0) 89 90 #define VALID_ADDRTYPE(t) ((t) == AF_INET) 91 92 #endif /* HAVE_IPV6 */ 93 94 struct host_info { 95 char name[STRING_LENGTH]; /* access via eval_hostname(host) */ 96 char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */ 97 struct sockaddr_gen *sin; /* socket address or 0 */ 98 struct t_unitdata *unit; /* TLI transport address or 0 */ 99 struct request_info *request; /* for shared information */ 100 }; 101 102 /* Structure to describe what we know about a service request. */ 103 104 struct request_info { 105 int fd; /* socket handle */ 106 char user[STRING_LENGTH]; /* access via eval_user(request) */ 107 char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */ 108 char pid[10]; /* access via eval_pid(request) */ 109 struct host_info client[1]; /* client endpoint info */ 110 struct host_info server[1]; /* server endpoint info */ 111 void (*sink) (); /* datagram sink function or 0 */ 112 void (*hostname) (); /* address to printable hostname */ 113 void (*hostaddr) (); /* address to printable address */ 114 void (*cleanup) (); /* cleanup function or 0 */ 115 struct netconfig *config; /* netdir handle */ 116 }; 117 118 /* Common string operations. Less clutter should be more readable. */ 119 120 #define STRN_CPY(d, s, l) { strncpy((d), (s), (l)); (d)[(l)-1] = 0; } 121 122 #define STRN_EQ(x, y, l) (strncasecmp((x), (y), (l)) == 0) 123 #define STRN_NE(x, y, l) (strncasecmp((x), (y), (l)) != 0) 124 #define STR_EQ(x, y) (strcasecmp((x), (y)) == 0) 125 #define STR_NE(x, y) (strcasecmp((x), (y)) != 0) 126 127 /* 128 * Initially, all above strings have the empty value. Information that 129 * cannot be determined at runtime is set to "unknown", so that we can 130 * distinguish between `unavailable' and `not yet looked up'. A hostname 131 * that we do not believe in is set to "paranoid". 132 */ 133 134 #define STRING_UNKNOWN "unknown" /* lookup failed */ 135 #define STRING_PARANOID "paranoid" /* hostname conflict */ 136 137 extern char unknown[]; 138 extern char paranoid[]; 139 140 #define HOSTNAME_KNOWN(s) (STR_NE((s), unknown) && STR_NE((s), paranoid)) 141 142 #ifdef HAVE_IPV6 143 #define NOT_INADDR(s) (strchr(s, ':') == 0 && s[strspn(s, "0123456789./")] != 0) 144 #else 145 #define NOT_INADDR(s) (s[strspn(s, "0123456789./")] != 0) 146 #endif 147 148 /* Global functions. */ 149 150 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT) 151 extern void fromhost(); /* get/validate client host info */ 152 #else 153 #define fromhost sock_host /* no TLI support needed */ 154 #endif 155 156 /* wrapper around request_init() */ 157 extern int hosts_ctl(const char *, const char *, const char *, const char *); 158 159 /* access control */ 160 extern int hosts_access(struct request_info *); 161 162 /* execute shell command */ 163 extern void shell_cmd(char *); 164 165 /* do %<char> expansion */ 166 extern char *percent_x(char *, int, char *, struct request_info *); 167 168 /* client name from RFC 931 daemon */ 169 extern void rfc931(struct sockaddr_gen *, struct sockaddr_gen *, char *); 170 171 /* clean up and exit */ 172 extern void clean_exit(struct request_info *); 173 174 /* clean up and exit */ 175 extern void refuse(struct request_info *); 176 177 /* fgets() on steroids */ 178 extern char *xgets(char *, int, __FILE *); 179 180 /* strchr() and split */ 181 extern char *split_at(char *, int); 182 183 /* restricted inet_addr() */ 184 extern unsigned long dot_quad_addr(char *); 185 186 /* IP4/IP6 inet_addr (restricted) */ 187 extern int numeric_addr(char *, union gen_addr *, int *, int *); 188 189 /* IP4/IP6 gethostbyname */ 190 extern struct hostent *tcpd_gethostbyname(char *, int); 191 192 /* skip over colons in IPv6 addrs */ 193 #ifdef HAVE_IPV6 194 extern char *skip_ipv6_addrs(char *); 195 #else 196 #define skip_ipv6_addrs(x) x 197 #endif 198 199 /* Global variables. */ 200 201 extern int allow_severity; /* for connection logging */ 202 extern int deny_severity; /* for connection logging */ 203 extern char *hosts_allow_table; /* for verification mode redirection */ 204 extern char *hosts_deny_table; /* for verification mode redirection */ 205 extern int hosts_access_verbose; /* for verbose matching mode */ 206 extern int rfc931_timeout; /* user lookup timeout */ 207 extern int resident; /* > 0 if resident process */ 208 209 /* 210 * Routines for controlled initialization and update of request structure 211 * attributes. Each attribute has its own key. 212 */ 213 214 extern struct request_info *request_init(struct request_info *, ...); 215 extern struct request_info *request_set(struct request_info *, ...); 216 217 #define RQ_FILE 1 /* file descriptor */ 218 #define RQ_DAEMON 2 /* server process (argv[0]) */ 219 #define RQ_USER 3 /* client user name */ 220 #define RQ_CLIENT_NAME 4 /* client host name */ 221 #define RQ_CLIENT_ADDR 5 /* client host address */ 222 #define RQ_CLIENT_SIN 6 /* client endpoint (internal) */ 223 #define RQ_SERVER_NAME 7 /* server host name */ 224 #define RQ_SERVER_ADDR 8 /* server host address */ 225 #define RQ_SERVER_SIN 9 /* server endpoint (internal) */ 226 227 /* 228 * Routines for delayed evaluation of request attributes. Each attribute 229 * type has its own access method. The trivial ones are implemented by 230 * macros. The other ones are wrappers around the transport-specific host 231 * name, address, and client user lookup methods. The request_info and 232 * host_info structures serve as caches for the lookup results. 233 */ 234 235 extern char *eval_user(); /* client user */ 236 extern char *eval_hostname(); /* printable hostname */ 237 extern char *eval_hostaddr(); /* printable host address */ 238 extern char *eval_hostinfo(); /* host name or address */ 239 extern char *eval_client(); /* whatever is available */ 240 extern char *eval_server(); /* whatever is available */ 241 #define eval_daemon(r) ((r)->daemon) /* daemon process name */ 242 #define eval_pid(r) ((r)->pid) /* process id */ 243 244 /* Socket-specific methods, including DNS hostname lookups. */ 245 246 extern void sock_host(); /* look up endpoint addresses */ 247 extern void sock_hostname(); /* translate address to hostname */ 248 extern void sock_hostaddr(); /* address to printable address */ 249 #define sock_methods(r) \ 250 { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; } 251 252 /* The System V Transport-Level Interface (TLI) interface. */ 253 254 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT) 255 extern void tli_host(); /* look up endpoint addresses etc. */ 256 #endif 257 258 /* 259 * Problem reporting interface. Additional file/line context is reported 260 * when available. The jump buffer (tcpd_buf) is not declared here, or 261 * everyone would have to include <setjmp.h>. 262 */ 263 264 #ifdef __STDC__ 265 extern void tcpd_warn(char *, ...); /* report problem and proceed */ 266 extern void tcpd_jump(char *, ...); /* report problem and jump */ 267 #else 268 extern void tcpd_warn(); 269 extern void tcpd_jump(); 270 #endif 271 272 struct tcpd_context { 273 char *file; /* current file */ 274 int line; /* current line */ 275 }; 276 extern struct tcpd_context tcpd_context; 277 278 /* 279 * While processing access control rules, error conditions are handled by 280 * jumping back into the hosts_access() routine. This is cleaner than 281 * checking the return value of each and every silly little function. The 282 * (-1) returns are here because zero is already taken by longjmp(). 283 */ 284 285 #define AC_PERMIT 1 /* permit access */ 286 #define AC_DENY (-1) /* deny_access */ 287 #define AC_ERROR AC_DENY /* XXX */ 288 289 /* 290 * In verification mode an option function should just say what it would do, 291 * instead of really doing it. An option function that would not return 292 * should clear the dry_run flag to inform the caller of this unusual 293 * behavior. 294 */ 295 296 extern void process_options(); /* execute options */ 297 extern int dry_run; /* verification flag */ 298 299 /* Bug workarounds. */ 300 301 #ifdef INET_ADDR_BUG /* inet_addr() returns struct */ 302 #define inet_addr fix_inet_addr 303 extern long fix_inet_addr(); 304 #endif 305 306 #ifdef BROKEN_FGETS /* partial reads from sockets */ 307 #define fgets fix_fgets 308 extern char *fix_fgets(); 309 #endif 310 311 #ifdef RECVFROM_BUG /* no address family info */ 312 #define recvfrom fix_recvfrom 313 extern int fix_recvfrom(); 314 #endif 315 316 #ifdef GETPEERNAME_BUG /* claims success with UDP */ 317 #define getpeername fix_getpeername 318 extern int fix_getpeername(); 319 #endif 320 321 #ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */ 322 #define gethostbyname fix_gethostbyname 323 extern struct hostent *fix_gethostbyname(); 324 #endif 325 326 #ifdef USE_STRSEP /* libc calls strtok() */ 327 #define strtok fix_strtok 328 extern char *fix_strtok(); 329 #endif 330 331 #ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */ 332 #define strtok my_strtok 333 extern char *my_strtok(); 334 #endif 335 336 #endif /* _TCPD_H */ 337