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