BSD 3 development

[unix-history] / usr / src / cmd / net / nsh.c

# include "defs.h"
/*
       nsh -c "comand to be executed"

       This pseudo-shell is executed over the network
       as the login shell of an acount "network", no passwd.
       It will only execute certain allowed commands.

       has these exit codes:
               8 = wrong # arguments to nsh
               9 = command you execute may not take arguments
               10= the execl failed
               11= could not find full path name for the command

       count is the # of arguments (= argc) allowed.
       a count of 0 turns off the command
*/

struct {
       char *app;
       char count;
       char *full;
       char *full1;
       } st[] = {
       "bpq",          20,     "/usr/bin/bpq",         "/bin/bpq",
       "epq",          20,     "/usr/bin/epq",         "/bin/epq",
       "finger",       20,     "/usr/ucb/finger",      "/usr/bin/finger",
       "lpq",          20,     "/usr/bin/lpq",         "/bin/lpq",
# ifdef FREELPR
       "lpr",          20,     "/usr/bin/lpr",         "/bin/lpr",
# endif
       "mmail",        20,     "/usr/net/bin/mmail",   "/usr/net/bin/mmail",
       "mwrite",       20,     "/usr/net/bin/mwrite",  "/usr/net/bin/mwrite",
       "netlog",       20,     "/usr/bin/netlog",      "/usr/ucb/netlog",
       "netq",         20,     "/usr/bin/netq",        "/usr/ucb/netq",
       "prmail",       20,     "/usr/net/bin/prmail",  "/usr/net/bin/prmail",
       "ps",           20,     "/bin/ps",              "/usr/bin/ps",
       "pstat",        20,     "/usr/bin/pstat",       "/bin/pstat",
       "rcs",          20,     "/usr/bin/rcs",         "/bin/rcs",
       "rcslog",       1,      "/usr/bin/rcslog",      "/bin/rcslog",
       "rcsq",         20,     "/usr/bin/rcsq",        "/bin/rcsq",
       "trq",          20,     "/usr/bin/trq",         "/bin/trq",
       "w",            20,     "/usr/bin/w",           "/usr/ucb/w",
       "where",        20,     "/usr/bin/where",       "/bin/where",
       "who",          20,     "/bin/who",             "/usr/bin/who",
       "whom",         20,     "/usr/ucb/whom",        "/usr/bin/whom",
       "write",        20,     "/usr/bin/write",       "/bin/write",
       "yank",         20,     "/usr/ucb/yank",        "/usr/bin/yank",
       0,              0,              0,              0
       };
/* nsh -c cmd */
main(argc,argv)
 char **argv; {
       char *s, buf[500];
       int i, flg = 0;
       if(argc != 3){
               fprintf(stderr,"Wrong number of arguments to nsh.\n");
               exit(8);
       }
       s = argv[2];
       while(*s && *s != ' ')s++;
       if(*s == ' ')flg++;
       *s = 0;
       if((i = mlookup(argv[2])) < 0){
               fprintf(stderr,
               "Command '%s' is not allowed if logged in as 'network'.\n",
                       argv[2]);
               exit(11);
       }
       if(st[i].count == 0){
               fprintf(stderr,
               "The command '%s' is not allowed to have arguments.\n",argv[2]);
               exit(9);
               }
       if(stat(st[i].full,buf) >= 0)
               strcpy(buf,st[i].full);
       else strcpy(buf,st[i].full1);
       if(flg && st[i].count > 1){  /* some cmds don't allow parms */
               *s = ' ';
               strcat(buf,s);
               }
       /*
       fprintf(stderr,"%s\n",buf);
       */
       execl(Bsh,"sh","-c",buf,0);
       fprintf(stderr,"Execute of shell failed.\n");
       exit(10);
       }
mlookup(s)
 char *s; {
       int i;
       for(i = 0; st[i].app; i++)
               if(strcmp(st[i].app,s) == 0 || strcmp(st[i].full,s) == 0
                || strcmp(st[i].full1,s) == 0)return(i);
       return(-1);
       }