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1 | /* |
2 | * Copyright (c) 1988 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software written by Ken Arnold and | |
6 | * published in UNIX Review, Vol. 6, No. 8. | |
7 | * | |
1343342a | 8 | * %sccs.include.redist.c% |
96c0abd0 | 9 | * |
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10 | */ |
11 | ||
12 | #ifndef lint | |
1343342a | 13 | static char sccsid[] = "@(#)popen.c 5.8 (Berkeley) %G%"; |
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14 | #endif /* not lint */ |
15 | ||
5f3a5fe7 | 16 | #include <sys/types.h> |
96c0abd0 | 17 | #include <sys/signal.h> |
882508af | 18 | #include <sys/wait.h> |
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19 | #include <stdio.h> |
20 | ||
5f3a5fe7 KB |
21 | /* |
22 | * Special version of popen which avoids call to shell. This insures noone | |
23 | * may create a pipe to a hidden program as a side effect of a list or dir | |
24 | * command. | |
25 | */ | |
882508af | 26 | static int *pids; |
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27 | static int fds; |
28 | ||
29 | FILE * | |
5256bbac | 30 | ftpd_popen(program, type) |
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31 | char *program, *type; |
32 | { | |
5f3a5fe7 | 33 | register char *cp; |
96c0abd0 | 34 | FILE *iop; |
5f3a5fe7 KB |
35 | int argc, gargc, pdes[2], pid; |
36 | char **pop, *argv[100], *gargv[1000], *vv[2]; | |
882508af | 37 | extern char **glob(), **copyblk(), *strtok(), *malloc(); |
96c0abd0 KB |
38 | |
39 | if (*type != 'r' && *type != 'w' || type[1]) | |
40 | return(NULL); | |
41 | ||
42 | if (!pids) { | |
43 | if ((fds = getdtablesize()) <= 0) | |
44 | return(NULL); | |
882508af | 45 | if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) |
96c0abd0 | 46 | return(NULL); |
882508af | 47 | bzero((char *)pids, fds * sizeof(int)); |
96c0abd0 KB |
48 | } |
49 | if (pipe(pdes) < 0) | |
50 | return(NULL); | |
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51 | |
52 | /* break up string into pieces */ | |
53 | for (argc = 0, cp = program;; cp = NULL) | |
54 | if (!(argv[argc++] = strtok(cp, " \t\n"))) | |
55 | break; | |
56 | ||
57 | /* glob each piece */ | |
58 | gargv[0] = argv[0]; | |
59 | for (gargc = argc = 1; argv[argc]; argc++) { | |
60 | if (!(pop = glob(argv[argc]))) { /* globbing failed */ | |
61 | vv[0] = argv[argc]; | |
62 | vv[1] = NULL; | |
63 | pop = copyblk(vv); | |
64 | } | |
65 | argv[argc] = (char *)pop; /* save to free later */ | |
66 | while (*pop && gargc < 1000) | |
67 | gargv[gargc++] = *pop++; | |
68 | } | |
69 | gargv[gargc] = NULL; | |
70 | ||
71 | iop = NULL; | |
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72 | switch(pid = vfork()) { |
73 | case -1: /* error */ | |
74 | (void)close(pdes[0]); | |
75 | (void)close(pdes[1]); | |
97f47643 | 76 | goto pfree; |
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77 | /* NOTREACHED */ |
78 | case 0: /* child */ | |
79 | if (*type == 'r') { | |
80 | if (pdes[1] != 1) { | |
81 | dup2(pdes[1], 1); | |
f8086b89 | 82 | dup2(pdes[1], 2); /* stderr, too! */ |
96c0abd0 KB |
83 | (void)close(pdes[1]); |
84 | } | |
85 | (void)close(pdes[0]); | |
86 | } else { | |
87 | if (pdes[0] != 0) { | |
88 | dup2(pdes[0], 0); | |
89 | (void)close(pdes[0]); | |
90 | } | |
91 | (void)close(pdes[1]); | |
92 | } | |
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93 | execv(gargv[0], gargv); |
94 | _exit(1); | |
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95 | } |
96 | /* parent; assume fdopen can't fail... */ | |
97 | if (*type == 'r') { | |
98 | iop = fdopen(pdes[0], type); | |
99 | (void)close(pdes[1]); | |
100 | } else { | |
101 | iop = fdopen(pdes[1], type); | |
102 | (void)close(pdes[0]); | |
103 | } | |
104 | pids[fileno(iop)] = pid; | |
5f3a5fe7 | 105 | |
97f47643 | 106 | pfree: for (argc = 1; argv[argc] != NULL; argc++) { |
5f3a5fe7 | 107 | blkfree((char **)argv[argc]); |
97f47643 KB |
108 | free((char *)argv[argc]); |
109 | } | |
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110 | return(iop); |
111 | } | |
112 | ||
882508af | 113 | ftpd_pclose(iop) |
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114 | FILE *iop; |
115 | { | |
116 | register int fdes; | |
882508af MK |
117 | int omask; |
118 | union wait stat_loc; | |
119 | int pid; | |
96c0abd0 KB |
120 | |
121 | /* | |
122 | * pclose returns -1 if stream is not associated with a | |
123 | * `popened' command, or, if already `pclosed'. | |
124 | */ | |
882508af | 125 | if (pids == 0 || pids[fdes = fileno(iop)] == 0) |
96c0abd0 KB |
126 | return(-1); |
127 | (void)fclose(iop); | |
128 | omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); | |
5f3a5fe7 | 129 | while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1); |
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130 | (void)sigsetmask(omask); |
131 | pids[fdes] = 0; | |
882508af | 132 | return(pid == -1 ? -1 : stat_loc.w_status); |
96c0abd0 | 133 | } |