diplodocus.org Git - nmh/blob - zotnet/mts/client.c

   1
   2 /*
   3  * client.c -- connect to a server
   4  *
   5  * $Id$
   6  */
   7
   8 #include <h/mh.h>
   9 #include <mts.h>
  10 #include <errno.h>
  11 #include <sys/socket.h>
  12 #include <netinet/in.h>
  13 #include <netdb.h>
  14
  15 #ifdef HAVE_ARPA_INET_H
  16 # include <arpa/inet.h>
  17 #endif
  18
  19 #ifdef HESIOD
  20 # include <hesiod.h>
  21 #endif
  22
  23 #ifdef KPOP
  24 # include <krb.h>
  25 # include <ctype.h>
  26 #endif  /* KPOP */
  27
  28 #define TRUE         1
  29 #define FALSE        0
  30
  31 #define OOPS1      (-2)
  32 #define OOPS2      (-3)
  33
  34 #define MAXARGS   1000
  35 #define MAXNETS      5
  36 #define MAXHOSTS    25
  37
  38 struct addrent {
  39     int a_addrtype;             /* assumes AF_INET for inet_netof () */
  40     union {
  41         int un_net;
  42         char un_addr[14];
  43     } un;
  44 };
  45
  46 #define a_net  un.un_net
  47 #define a_addr un.un_addr
  48
  49 static struct addrent *n1, *n2;
  50 static struct addrent nets[MAXNETS];
  51 static struct addrent *h1, *h2;
  52 static struct addrent hosts[MAXHOSTS];
  53
  54 #ifdef KPOP
  55 static CREDENTIALS cred;
  56 static MSG_DAT msg_data;
  57 static KTEXT ticket = (KTEXT) NULL;
  58 static Key_schedule schedule;
  59 static char *kservice;                  /* "pop" if using kpop */
  60 char krb_realm[REALM_SZ];
  61 char *PrincipalHostname();
  62 #endif /* KPOP */
  63
  64 #if defined(BIND) && !defined(h_addr)
  65 # define h_addr h_addr_list[0]
  66 #endif
  67
  68 #define inaddr_copy(hp,sin) \
  69     memcpy(&((sin)->sin_addr), (hp)->h_addr, (hp)->h_length)
  70
  71 /*
  72  * static prototypes
  73  */
  74 static int rcaux (struct servent *, struct hostent *, int, char *, int);
  75 static int getport (int, int, char *, int);
  76 static int inet (struct hostent *, int);
  77 struct hostent *gethostbystring (char *s);
  78
  79 /* client's own static version of several nmh subroutines */
  80 static char **client_brkstring (char *, char *, char *);
  81 static int client_brkany (char, char *);
  82 static char **client_copyip (char **, char **, int);
  83 static char *client_getcpy (char *);
  84
  85
  86 int
  87 client (char *args, char *protocol, char *service, int rproto,
  88                 char *response, int len_response)
  89 {
  90     int sd;
  91     register char **ap;
  92     char *arguments[MAXARGS];
  93     register struct hostent *hp;
  94     register struct servent *sp;
  95 #ifndef BIND
  96     register struct netent *np;
  97 #endif
  98
  99 #ifdef KPOP
 100     char *cp;
 101
 102     kservice = service;
 103     if (cp = strchr (service, '/')) {   /* "pop/kpop" */
 104         *cp++ = '\0';           /* kservice = "pop" */
 105         service = cp;           /* service  = "kpop" */
 106     } else {
 107         kservice = NULL;        /* not using KERBEROS */
 108     }
 109 #endif  /* KPOP */
 110
 111
 112     if ((sp = getservbyname (service, protocol)) == NULL) {
 113 #ifdef HESIOD
 114         if ((sp = hes_getservbyname (service, protocol)) == NULL) {
 115             snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
 116             return NOTOK;
 117         }
 118 #else
 119         snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
 120         return NOTOK;
 121 #endif
 122     }
 123
 124     ap = arguments;
 125     if (args != NULL && *args != 0) {
 126         ap = client_copyip (client_brkstring (client_getcpy (args), " ", "\n"),
 127                 ap, MAXARGS);
 128     } else {
 129         if (servers != NULL && *servers != 0)
 130             ap = client_copyip (client_brkstring (client_getcpy (servers), " ", "\n"),
 131                 ap, MAXARGS);
 132     }
 133     if (ap == arguments) {
 134         *ap++ = client_getcpy ("localhost");
 135         *ap = NULL;
 136     }
 137
 138     n1 = nets;
 139     n2 = nets + sizeof(nets) / sizeof(nets[0]);
 140
 141     h1 = hosts;
 142     h2 = hosts + sizeof(hosts) / sizeof(hosts[0]);
 143
 144     for (ap = arguments; *ap; ap++) {
 145         if (**ap == '\01') {
 146 #ifndef BIND
 147             if ((np = getnetbyname (*ap + 1))) {
 148                 sethostent (1);
 149                 while ((hp = gethostent()))
 150                     if (np->n_addrtype == hp->h_addrtype
 151                             && inet (hp, np->n_net)) {
 152                         switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
 153                             case NOTOK:
 154                                 continue;
 155                             case OOPS1:
 156                                 break;
 157                             case OOPS2:
 158                                 return NOTOK;
 159
 160                             default:
 161                                 return sd;
 162                         }
 163                         break;
 164                     }
 165             }
 166 #endif
 167             continue;
 168         }
 169
 170         if ((hp = gethostbystring (*ap))) {
 171             switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
 172                 case NOTOK:
 173                 case OOPS1:
 174                     break;
 175                 case OOPS2:
 176                     return NOTOK;
 177
 178                 default:
 179                     return sd;
 180             }
 181             continue;
 182         }
 183     }
 184
 185     strncpy (response, "no servers available", len_response);
 186     return NOTOK;
 187 }
 188
 189
 190 static int
 191 rcaux (struct servent *sp, struct hostent *hp, int rproto,
 192                 char *response, int len_response)
 193 {
 194     int sd;
 195     struct in_addr in;
 196     register struct addrent *ap;
 197     struct sockaddr_in in_socket;
 198     register struct sockaddr_in *isock = &in_socket;
 199
 200 #ifdef KPOP
 201     int rem;
 202 #endif  /* KPOP */
 203
 204     for (ap = nets; ap < n1; ap++)
 205         if (ap->a_addrtype == hp->h_addrtype && inet (hp, ap->a_net))
 206             return NOTOK;
 207
 208     for (ap = hosts; ap < h1; ap++)
 209         if (ap->a_addrtype == hp->h_addrtype
 210                 && memcmp(ap->a_addr, hp->h_addr, hp->h_length) == 0)
 211             return NOTOK;
 212
 213     if ((sd = getport (rproto, hp->h_addrtype, response, len_response)) == NOTOK)
 214         return OOPS2;
 215
 216     memset (isock, 0, sizeof(*isock));
 217     isock->sin_family = hp->h_addrtype;
 218     inaddr_copy (hp, isock);
 219     isock->sin_port = sp->s_port;
 220
 221     if (connect (sd, (struct sockaddr *) isock, sizeof(*isock)) == NOTOK)
 222         switch (errno) {
 223             case ENETDOWN:
 224             case ENETUNREACH:
 225                 close (sd);
 226                 if (n1 < n2) {
 227                     n1->a_addrtype = hp->h_addrtype;
 228                     memcpy(&in, hp->h_addr, sizeof(in));
 229                     n1->a_net = inet_netof (in);
 230                     n1++;
 231                 }
 232                 return OOPS1;
 233
 234             case ETIMEDOUT:
 235             case ECONNREFUSED:
 236             default:
 237                 close (sd);
 238                 if (h1 < h2) {
 239                     h1->a_addrtype = hp->h_addrtype;
 240                     memcpy(h1->a_addr, hp->h_addr, hp->h_length);
 241                     h1++;
 242                 }
 243                 return NOTOK;
 244         }
 245
 246 #ifdef KPOP
 247     if (kservice) {     /* "pop" */
 248         char *instance;
 249
 250         if ((instance = strdup (hp->h_name)) == NULL) {
 251             close (sd);
 252             strncpy (response, "Out of memory.", len_response);
 253             return OOPS2;
 254         }
 255         ticket = (KTEXT) malloc (sizeof(KTEXT_ST));
 256         rem = krb_sendauth (0L, sd, ticket, kservice, instance,
 257                            (char *) krb_realmofhost (instance),
 258                            (unsigned long) 0, &msg_data, &cred, schedule,
 259                            (struct sockaddr_in *) NULL,
 260                            (struct sockaddr_in *) NULL,
 261                            "KPOPV0.1");
 262         free (instance);
 263         if (rem != KSUCCESS) {
 264             close (sd);
 265             strncpy (response, "Post office refused connection: ", len_response);
 266             strncat (response, krb_err_txt[rem], len_response - strlen(response));
 267             return OOPS2;
 268         }
 269     }
 270 #endif /* KPOP */
 271
 272     return sd;
 273 }
 274
 275
 276 static int
 277 getport (int rproto, int addrtype, char *response, int len_response)
 278 {
 279     int sd, port;
 280     struct sockaddr_in in_socket, *isock;
 281
 282     isock = &in_socket;
 283     if (rproto && addrtype != AF_INET) {
 284         snprintf (response, len_response, "reserved ports not supported for af=%d", addrtype);
 285         errno = ENOPROTOOPT;
 286         return NOTOK;
 287     }
 288
 289     if ((sd = socket (AF_INET, SOCK_STREAM, 0)) == NOTOK) {
 290         char *s;
 291
 292         if ((s = strerror (errno)))
 293             snprintf (response, len_response, "unable to create socket: %s", s);
 294         else
 295             snprintf (response, len_response, "unable to create socket: unknown error");
 296         return NOTOK;
 297     }
 298 #ifdef KPOP
 299     if (kservice)       /* "pop" */
 300         return(sd);
 301 #endif  /* KPOP */
 302     if (!rproto)
 303         return sd;
 304
 305     memset(isock, 0, sizeof(*isock));
 306     isock->sin_family = addrtype;
 307     for (port = IPPORT_RESERVED - 1;;) {
 308         isock->sin_port = htons ((unsigned short) port);
 309         if (bind (sd, (struct sockaddr *) isock, sizeof(*isock)) != NOTOK)
 310             return sd;
 311
 312         switch (errno) {
 313             char *s;
 314
 315             case EADDRINUSE:
 316             case EADDRNOTAVAIL:
 317                 if (--port <= IPPORT_RESERVED / 2) {
 318                     strncpy (response, "ports available", len_response);
 319                     return NOTOK;
 320                 }
 321                 break;
 322
 323             default:
 324                 if ((s = strerror (errno)))
 325                     snprintf (response, len_response, "unable to bind socket: %s", s);
 326                 else
 327                     snprintf (response, len_response, "unable to bind socket: unknown error");
 328                 return NOTOK;
 329         }
 330     }
 331 }
 332
 333
 334 static int
 335 inet (struct hostent *hp, int net)
 336 {
 337     struct in_addr in;
 338
 339     memcpy(&in, hp->h_addr, sizeof(in));
 340     return (inet_netof (in) == net);
 341 }
 342
 343
 344 /*
 345  * taken from ISODE's compat/internet.c
 346  */
 347
 348 static char *empty = NULL;
 349
 350 #ifdef h_addr
 351 static char *addrs[2] = { NULL };
 352 #endif
 353
 354 struct hostent *
 355 gethostbystring (char *s)
 356 {
 357     register struct hostent *h;
 358     static struct hostent hs;
 359 #ifdef DG
 360     static struct in_addr iaddr;
 361 #else
 362     static unsigned long iaddr;
 363 #endif
 364
 365     iaddr = inet_addr (s);
 366 #ifdef DG
 367     if (iaddr.s_addr == NOTOK && strcmp (s, "255.255.255.255"))
 368 #else
 369     if (((int) iaddr == NOTOK) && strcmp (s, "255.255.255.255"))
 370 #endif
 371         return gethostbyname (s);
 372
 373     h = &hs;
 374     h->h_name = s;
 375     h->h_aliases = &empty;
 376     h->h_addrtype = AF_INET;
 377     h->h_length = sizeof(iaddr);
 378 #ifdef h_addr
 379     h->h_addr_list = addrs;
 380     memset(addrs, 0, sizeof(addrs));
 381 #endif
 382     h->h_addr = (char *) &iaddr;
 383
 384     return h;
 385 }
 386
 387
 388 /*
 389  * static copies of three nmh subroutines
 390  */
 391
 392 static char *broken[MAXARGS + 1];
 393
 394 static char **
 395 client_brkstring (char *strg, char *brksep, char *brkterm)
 396 {
 397     register int bi;
 398     register char c, *sp;
 399
 400     sp = strg;
 401
 402     for (bi = 0; bi < MAXARGS; bi++) {
 403         while (client_brkany (c = *sp, brksep))
 404             *sp++ = 0;
 405         if (!c || client_brkany (c, brkterm)) {
 406             *sp = 0;
 407             broken[bi] = 0;
 408             return broken;
 409         }
 410
 411         broken[bi] = sp;
 412         while ((c = *++sp) && !client_brkany (c, brksep) && !client_brkany (c, brkterm))
 413             continue;
 414     }
 415     broken[MAXARGS] = 0;
 416
 417     return broken;
 418 }
 419
 420
 421 /*
 422  * returns 1 if chr in strg, 0 otherwise
 423  */
 424 static int
 425 client_brkany (char chr, char *strg)
 426 {
 427     register char *sp;
 428
 429     if (strg)
 430         for (sp = strg; *sp; sp++)
 431             if (chr == *sp)
 432                 return 1;
 433     return 0;
 434 }
 435
 436
 437 /*
 438  * copy a string array and return pointer to end
 439  */
 440 static char **
 441 client_copyip (char **p, char **q, int len_q)
 442 {
 443     while (*p && --len_q > 0)
 444         *q++ = *p++;
 445
 446     *q = NULL;
 447
 448     return q;
 449 }
 450
 451
 452 static char *
 453 client_getcpy (char *str)
 454 {
 455     char *cp;
 456     size_t len;
 457
 458     len = strlen(str) + 1;
 459     if (!(cp = malloc(len)))
 460         return NULL;
 461
 462     memcpy (cp, str, len);
 463     return cp;
 464 }
 465