# 2.11BSD#431 - /usr/src/libexec/tcpd/scaffold.c

##### Functions

    check_dns         X
    check_path        X
    clean_exit        X
    find_inet_addr    X
    rfc931            X
    shell_cmd         X

##### Variables

    allow_severity    X
    deny_severity     X
    rfc931_timeout    X

##### Macros

    INADDR_NONE       X

##### struct's

    hostent_block     X

       1:  /*
       2:   * Routines for testing only. Not really industrial strength.
       3:   *
       4:   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
       5:   */
       6:
       7: #ifndef lint
       8: static char sccs_id[] = "@(#) scaffold.c 1.5 95/01/03 09:13:48";
       9: #endif
      10:
      11: /* System libraries. */
      12:
      13: #include <sys/types.h>
      14: #include <sys/stat.h>
      15: #include <sys/socket.h>
      16: #include <netinet/in.h>
      17: #include <arpa/inet.h>
      18: #include <netdb.h>
      19: #include <stdio.h>
      20: #include <syslog.h>
      21: #include <setjmp.h>
      22: #include <string.h>
      23:
      24: #ifndef INADDR_NONE
      25: #define INADDR_NONE (-1)        /* XXX should be 0xffffffff */
      26: #endif
      27:
      28: extern char *malloc();
      29:
      30: /* Application-specific. */
      31:
      32: #include "tcpd.h"
      33: #include "scaffold.h"
      34:
      35:  /*
      36:   * These are referenced by the options module and by rfc931.c.
      37:   */
      38: int     allow_severity = SEVERITY;
      39: int     deny_severity = LOG_WARNING;
      40: int     rfc931_timeout = RFC931_TIMEOUT;
      41:
      42: /* dup_hostent - create hostent in one memory block */
      43:
      44: static struct hostent *dup_hostent(hp)
      45: struct hostent *hp;
      46: {
      47:     struct hostent_block {
      48:     struct hostent host;
      49:     char   *addr_list[1];
      50:     };
      51:     struct hostent_block *hb;
      52:     int     count;
      53:     char   *data;
      54:     char   *addr;
      55:
      56:     for (count = 0; hp->h_addr_list[count] != 0; count++)
      57:      /* void */ ;
      58:
      59:     if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
      60:              + (hp->h_length + sizeof(char *)) * count)) == 0) {
      61:     fprintf(stderr, "Sorry, out of memory\n");
      62:     exit(1);
      63:     }
      64:     memset((char *) &hb->host, 0, sizeof(hb->host));
      65:     hb->host.h_length = hp->h_length;
      66:     hb->host.h_addr_list = hb->addr_list;
      67:     hb->host.h_addr_list[count] = 0;
      68:     data = (char *) (hb->host.h_addr_list + count + 1);
      69:
      70:     for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
      71:     hb->host.h_addr_list[count] = data + hp->h_length * count;
      72:     memcpy(hb->host.h_addr_list[count], addr, hp->h_length);
      73:     }
      74:     return (&hb->host);
      75: }
      76:
      77: /* find_inet_addr - find all addresses for this host, result to free() */
      78:
      79: struct hostent *find_inet_addr(host)
      80: char   *host;
      81: {
      82:     struct in_addr addr;
      83:     struct hostent *hp;
      84:     static struct hostent h;
      85:     static char *addr_list[2];
      86:
      87:     /*
      88:      * Host address: translate it to internal form.
      89:      */
      90:     if ((addr.s_addr = dot_quad_addr(host)) != INADDR_NONE) {
      91:     h.h_addr_list = addr_list;
      92:     h.h_addr_list[0] = (char *) &addr;
      93:     h.h_length = sizeof(addr);
      94:     return (dup_hostent(&h));
      95:     }
      96:
      97:     /*
      98:      * Map host name to a series of addresses. Watch out for non-internet
      99:      * forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
     100:      * been "enhanced" to accept numeric addresses. Make a copy of the
     101:      * address list so that later gethostbyXXX() calls will not clobber it.
     102:      */
     103:     if (NOT_INADDR(host) == 0) {
     104:     tcpd_warn("%s: not an internet address", host);
     105:     return (0);
     106:     }
     107:     if ((hp = gethostbyname(host)) == 0) {
     108:     tcpd_warn("%s: host not found", host);
     109:     return (0);
     110:     }
     111:     if (hp->h_addrtype != AF_INET) {
     112:     tcpd_warn("%d: not an internet host", hp->h_addrtype);
     113:     return (0);
     114:     }
     115:     if (STR_NE(host, hp->h_name)) {
     116:     tcpd_warn("%s: hostname alias", host);
     117:     tcpd_warn("(official name: %s)", hp->h_name);
     118:     }
     119:     return (dup_hostent(hp));
     120: }
     121:
     122: /* check_dns - give each address thorough workout, return address count */
     123:
     124: int     check_dns(host)
     125: char   *host;
     126: {
     127:     struct request_info request;
     128:     struct sockaddr_in sin;
     129:     struct hostent *hp;
     130:     int     count;
     131:     char   *addr;
     132:
     133:     if ((hp = find_inet_addr(host)) == 0)
     134:     return (0);
     135:     request_init(&request, RQ_CLIENT_SIN, &sin, 0);
     136:     sock_methods(&request);
     137:     memset((char *) &sin, 0, sizeof(sin));
     138:     sin.sin_family = AF_INET;
     139:
     140:     for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
     141:     memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr));
     142:
     143:     /*
     144: 	 * Force host name and address conversions. Use the request structure
     145: 	 * as a cache. Detect hostname lookup problems. Any name/name or
     146: 	 * name/address conflicts will be reported while eval_hostname() does
     147: 	 * its job.
     148: 	 */
     149:     request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
     150:     if (STR_EQ(eval_hostname(request.client), unknown))
     151:         tcpd_warn("host address %s->name lookup failed",
     152:               eval_hostaddr(request.client));
     153:     }
     154:     free((char *) hp);
     155:     return (count);
     156: }
     157:
     158: /* dummy function to intercept the real shell_cmd() */
     159:
     160: /* ARGSUSED */
     161:
     162: void    shell_cmd(command)
     163: char   *command;
     164: {
     165:     if (hosts_access_verbose)
     166:     printf("command: %s", command);
     167: }
     168:
     169: /* dummy function  to intercept the real clean_exit() */
     170:
     171: /* ARGSUSED */
     172:
     173: void    clean_exit(request)
     174: struct request_info *request;
     175: {
     176:     exit(0);
     177: }
     178:
     179: /* dummy function  to intercept the real rfc931() */
     180:
     181: /* ARGSUSED */
     182:
     183: void    rfc931(request)
     184: struct request_info *request;
     185: {
     186:     strcpy(request->user, unknown);
     187: }
     188:
     189: /* check_path - examine accessibility */
     190:
     191: int     check_path(path, st)
     192: char   *path;
     193: struct stat *st;
     194: {
     195:     struct stat stbuf;
     196:     char    buf[BUFSIZ];
     197:
     198:     if (stat(path, st) < 0)
     199:     return (-1);
     200: #ifdef notdef
     201:     if (st->st_uid != 0)
     202:     tcpd_warn("%s: not owned by root", path);
     203:     if (st->st_mode & 020)
     204:     tcpd_warn("%s: group writable", path);
     205: #endif
     206:     if (st->st_mode & 002)
     207:     tcpd_warn("%s: world writable", path);
     208:     if (path[0] == '/' && path[1] != 0) {
     209:     strrchr(strcpy(buf, path), '/')[0] = 0;
     210:     (void) check_path(buf[0] ? buf : "/", &stbuf);
     211:     }
     212:     return (0);
     213: }

#### Defined functions

check_dns defined in line 124; used 3 times

- in /usr/src/libexec/tcpd/scaffold.h line 8
- in /usr/src/libexec/tcpd/tcpdchk.c line 423, 431

check_path defined in line 191; used 11 times

- in line 210
- in /usr/src/libexec/tcpd/inetcf.c line 94, 176, 222, 229, 247
- in /usr/src/libexec/tcpd/scaffold.h line 9
- in /usr/src/libexec/tcpd/tcpdchk.c line 139-140(2)
- in /usr/src/libexec/tcpd/tcpdmatch.c line 142-143(2)

clean_exit defined in line 173; used 6 times

- in /usr/src/libexec/tcpd/fix_options.c line 48
- in /usr/src/libexec/tcpd/miscd.c line 117
- in /usr/src/libexec/tcpd/options.c line 395
- in /usr/src/libexec/tcpd/refuse.c line 29
- in /usr/src/libexec/tcpd/tcpd.c line 126
- in /usr/src/libexec/tcpd/tcpd.h line 73

dup_hostent defined in line 44; used 2 times

- in line 94, 119

find_inet_addr defined in line 79; used 4 times

- in line 133
- in /usr/src/libexec/tcpd/scaffold.h line 7
- in /usr/src/libexec/tcpd/tcpdmatch.c line 160, 217

rfc931 defined in line 183; never used
shell_cmd defined in line 162; used 4 times

- in /usr/src/libexec/tcpd/hosts_access.c line 166
- in /usr/src/libexec/tcpd/options.c line 307
- in /usr/src/libexec/tcpd/tcpd.h line 70
- in /usr/src/libexec/tcpd/tcpdchk.c line 240

#### Defined variables

allow_severity defined in line 38; used 1 times

- in /usr/src/libexec/tcpd/tcpdmatch.c line 293

deny_severity defined in line 39; used 1 times

- in /usr/src/libexec/tcpd/tcpdmatch.c line 294

rfc931_timeout defined in line 40; never used
sccs_id defined in line 8; never used

#### Defined struct's

hostent_block defined in line 47; used 6 times

- in line 51(2), 59(4)

#### Defined macros

INADDR_NONE defined in line 25; used 2 times

- in line 24, 90

Last modified: 1995-01-03 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 841 |