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1.1 root 1: # include "defs.h"
2: /*
3: nsh -c "comand to be executed"
4:
5: This pseudo-shell is executed over the network
6: as the login shell of an acount "network", no passwd.
7: It will only execute certain allowed commands.
8:
9: has these exit codes:
10: EX_USAGE = wrong # arguments to nsh
11: 9 = command you execute may not take arguments
12: 10= the execl failed
13: EX_UNAVAILABLE= could not find full path name for the command
14:
15: count is the # of arguments (= argc) allowed.
16: a count of 0 turns off the command
17: */
18:
19: struct {
20: char *app;
21: char count;
22: char *full;
23: char *full1;
24: } st[] = {
25: /* I assume these are the same for RAND */
26: "mmail", 20, "/usr/net/bin/mmail", "/usr/net/bin/mmail",
27: "mwrite", 20, "/usr/net/bin/mwrite", "/usr/net/bin/mwrite",
28: "prmail", 20, "/usr/net/bin/prmail", "/usr/net/bin/prmail",
29: # ifndef NFREECMD
30: "bpq", 20, "/usr/bin/bpq", "/bin/bpq",
31: "epq", 20, "/usr/bin/epq", "/bin/epq",
32: "finger", 20, "/usr/ucb/finger", "/usr/bin/finger",
33: "help", 20, "/bin/help", "/usr/bin/help",
34: "lpq", 20, "/usr/bin/lpq", "/bin/lpq",
35: # ifdef FREELPR
36: "lpr", 20, "/usr/bin/lpr", "/bin/lpr",
37: # endif
38: "netlog", 20, "/usr/bin/netlog", "/usr/ucb/netlog",
39: "netq", 20, "/usr/bin/netq", "/usr/ucb/netq",
40: "news", 20, "/usr/bin/news", "/usr/ucb/news",
41: "ps", 20, "/bin/ps", "/usr/bin/ps",
42: "pstat", 20, "/usr/bin/pstat", "/bin/pstat",
43: "rcs", 20, "/usr/bin/rcs", "/bin/rcs",
44: "rcslog", 1, "/usr/bin/rcslog", "/bin/rcslog",
45: "rcsq", 20, "/usr/bin/rcsq", "/bin/rcsq",
46: "trq", 20, "/usr/bin/trq", "/bin/trq",
47: "vpq", 20, "/usr/ucb/vpq", "/usr/bin/vpq",
48: "w", 20, "/usr/ucb/w", "/usr/bin/w",
49: "wc", 20, "/usr/bin/wc", "/bin/wc",
50: "where", 20, "/usr/bin/where", "/bin/where",
51: "who", 20, "/bin/who", "/usr/bin/who",
52: "whom", 20, "/usr/ucb/whom", "/usr/bin/whom",
53: "write", 20, "/usr/bin/write", "/bin/write",
54: "yank", 20, "/usr/ucb/yank", "/usr/bin/yank",
55: # endif
56: 0, 0, 0, 0
57: };
58: /* nsh -c cmd */
59: main(argc,argv)
60: char **argv; {
61: char *s, buf[500];
62: int i, flg = 0;
63: if(argc != 3){
64: fprintf(stderr,"Wrong number of arguments to nsh.\n");
65: exit(EX_USAGE);
66: }
67: s = argv[2];
68: while(*s && *s != ' ')s++;
69: if(*s == ' ')flg++;
70: *s = 0;
71: if((i = mlookup(argv[2])) < 0){
72: fprintf(stderr,
73: "Command '%s' is not allowed if logged in as 'network'.\n",
74: argv[2]);
75: exit(11);
76: }
77: if(st[i].count == 0){
78: fprintf(stderr,
79: "The command '%s' is not allowed to have arguments.\n",argv[2]);
80: exit(9);
81: }
82: if(stat(st[i].full,buf) >= 0)
83: strcpy(buf,st[i].full);
84: else strcpy(buf,st[i].full1);
85: if(flg && st[i].count > 1){ /* some cmds don't allow parms */
86: *s = ' ';
87: strcat(buf,s);
88: }
89: /*
90: fprintf(stderr,"%s\n",buf);
91: */
92: execl(Bsh,"sh","-c",buf,0);
93: fprintf(stderr,"Execute of shell failed.\n");
94: exit(EX_UNAVAILABLE);
95: }
96: mlookup(s)
97: char *s; {
98: int i;
99: for(i = 0; st[i].app; i++)
100: if(strcmp(st[i].app,s) == 0 || strcmp(st[i].full,s) == 0
101: || strcmp(st[i].full1,s) == 0)return(i);
102: return(-1);
103: }
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