[9] | 1 | /*
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| 2 | setup.c
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| 3 | */
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| 4 |
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| 5 | #include <sys/types.h>
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| 6 | #include <sys/ioctl.h>
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| 7 | #include <errno.h>
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| 8 | #include <stdio.h>
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| 9 | #include <stdlib.h>
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| 10 | #include <string.h>
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| 11 | #include <unistd.h>
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| 12 | #include <net/netlib.h>
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| 13 | #include <net/gen/in.h>
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| 14 | #include <net/gen/inet.h>
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| 15 | #include <net/gen/tcp.h>
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| 16 | #include <net/gen/tcp_io.h>
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| 17 | #include <net/gen/netdb.h>
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| 18 | #include <net/gen/socket.h>
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| 19 | #include "rlogind.h"
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| 20 |
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| 21 | static void getstr(char *buf, int cnt, char *errmsg);
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| 22 |
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| 23 | void authenticate(void)
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| 24 | {
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| 25 | int result;
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| 26 | struct nwio_tcpconf tcpconf;
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| 27 | struct hostent *hostent;
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| 28 | char c;
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| 29 |
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| 30 | /* Let's lookup the hostname for the connection. */
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| 31 | result= ioctl (0, NWIOGTCPCONF, &tcpconf);
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| 32 | if (result<0)
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| 33 | {
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| 34 | fprintf(stderr, "%s: ioctl(NWIOTCPCONF): %s\r\n",
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| 35 | prog_name, strerror(errno));
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| 36 | exit(1);
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| 37 | }
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| 38 | hostent= gethostbyaddr((char *)&tcpconf.nwtc_remaddr,
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| 39 | sizeof(tcpconf.nwtc_remaddr), AF_INET);
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| 40 | if (hostent)
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| 41 | {
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| 42 | strncpy(hostname, hostent->h_name, sizeof(hostname)-1);
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| 43 | hostname[sizeof(hostname)-1]= '\0';
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| 44 | }
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| 45 | else
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| 46 | {
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| 47 | strcpy(hostname, inet_ntoa(tcpconf.nwtc_remaddr));
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| 48 | }
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| 49 |
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| 50 | authenticated = 0;
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| 51 |
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| 52 | getstr(&c, 1, "protocol violation");
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| 53 | getstr(rusername, sizeof(rusername), "remuser too long");
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| 54 | getstr(lusername, sizeof(lusername), "locuser too long");
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| 55 | strcpy(term, "TERM=");
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| 56 | getstr(term+5, sizeof(term)-5, "Terminal type too long");
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| 57 |
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| 58 | #if DEBUG
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| 59 | fprintf(stderr, "got lu= %s, ru= %s, te= %s\r\n", lusername, rusername,
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| 60 | term);
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| 61 | #endif
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| 62 | if (iruserok(tcpconf.nwtc_remaddr, 0, rusername, lusername) == 0)
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| 63 | authenticated = 1;
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| 64 | }
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| 65 |
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| 66 | static void getstr(char *buf, int cnt, char *errmsg)
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| 67 | {
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| 68 | char c;
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| 69 |
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| 70 | errno= 0;
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| 71 | do
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| 72 | {
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| 73 | if (read(0, &c, 1) != 1)
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| 74 | fatal(1, "read failed", errno);
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| 75 | cnt--;
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| 76 | if (cnt < 0)
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| 77 | fatal(1, errmsg, 0);
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| 78 | *buf++= c;
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| 79 | } while(c != 0);
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| 80 | }
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| 81 |
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| 82 | void tcp_urg(int fd, int on)
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| 83 | {
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| 84 | struct nwio_tcpopt tcpopt;
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| 85 |
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| 86 | tcpopt.nwto_flags= on ? (NWTO_BSD_URG | NWTO_SND_URG) : NWTO_SND_NOTURG;
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| 87 | if (ioctl(1, NWIOSTCPOPT, &tcpopt) == -1)
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| 88 | {
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| 89 | fprintf(stderr, "rlogind: NWIOSTCPOPT failed: %s\r\n",
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| 90 | strerror(errno));
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| 91 | }
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| 92 | }
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