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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 | |
60de319b | 13 | static char sccsid[] = "@(#)popen.c 5.10 (Berkeley) %G%"; |
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14 | #endif /* not lint */ |
15 | ||
5f3a5fe7 | 16 | #include <sys/types.h> |
882508af | 17 | #include <sys/wait.h> |
60de319b | 18 | |
5bb0ca89 KB |
19 | #include <signal.h> |
20 | #include <unistd.h> | |
96c0abd0 | 21 | #include <stdio.h> |
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22 | #include <stdlib.h> |
23 | #include <string.h> | |
60de319b | 24 | #include "extern.h" |
96c0abd0 | 25 | |
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26 | /* |
27 | * Special version of popen which avoids call to shell. This insures noone | |
28 | * may create a pipe to a hidden program as a side effect of a list or dir | |
29 | * command. | |
30 | */ | |
882508af | 31 | static int *pids; |
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32 | static int fds; |
33 | ||
34 | FILE * | |
5256bbac | 35 | ftpd_popen(program, type) |
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36 | char *program, *type; |
37 | { | |
5f3a5fe7 | 38 | register char *cp; |
96c0abd0 | 39 | FILE *iop; |
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40 | int argc, gargc, pdes[2], pid; |
41 | char **pop, *argv[100], *gargv[1000], *vv[2]; | |
96c0abd0 KB |
42 | |
43 | if (*type != 'r' && *type != 'w' || type[1]) | |
44 | return(NULL); | |
45 | ||
46 | if (!pids) { | |
47 | if ((fds = getdtablesize()) <= 0) | |
48 | return(NULL); | |
882508af | 49 | if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) |
96c0abd0 | 50 | return(NULL); |
882508af | 51 | bzero((char *)pids, fds * sizeof(int)); |
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52 | } |
53 | if (pipe(pdes) < 0) | |
54 | return(NULL); | |
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55 | |
56 | /* break up string into pieces */ | |
57 | for (argc = 0, cp = program;; cp = NULL) | |
58 | if (!(argv[argc++] = strtok(cp, " \t\n"))) | |
59 | break; | |
60 | ||
61 | /* glob each piece */ | |
62 | gargv[0] = argv[0]; | |
63 | for (gargc = argc = 1; argv[argc]; argc++) { | |
5bb0ca89 | 64 | if (!(pop = ftpglob(argv[argc]))) { /* globbing failed */ |
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65 | vv[0] = argv[argc]; |
66 | vv[1] = NULL; | |
67 | pop = copyblk(vv); | |
68 | } | |
69 | argv[argc] = (char *)pop; /* save to free later */ | |
70 | while (*pop && gargc < 1000) | |
71 | gargv[gargc++] = *pop++; | |
72 | } | |
73 | gargv[gargc] = NULL; | |
74 | ||
75 | iop = NULL; | |
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76 | switch(pid = vfork()) { |
77 | case -1: /* error */ | |
78 | (void)close(pdes[0]); | |
79 | (void)close(pdes[1]); | |
97f47643 | 80 | goto pfree; |
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81 | /* NOTREACHED */ |
82 | case 0: /* child */ | |
83 | if (*type == 'r') { | |
84 | if (pdes[1] != 1) { | |
85 | dup2(pdes[1], 1); | |
f8086b89 | 86 | dup2(pdes[1], 2); /* stderr, too! */ |
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87 | (void)close(pdes[1]); |
88 | } | |
89 | (void)close(pdes[0]); | |
90 | } else { | |
91 | if (pdes[0] != 0) { | |
92 | dup2(pdes[0], 0); | |
93 | (void)close(pdes[0]); | |
94 | } | |
95 | (void)close(pdes[1]); | |
96 | } | |
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97 | execv(gargv[0], gargv); |
98 | _exit(1); | |
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99 | } |
100 | /* parent; assume fdopen can't fail... */ | |
101 | if (*type == 'r') { | |
102 | iop = fdopen(pdes[0], type); | |
103 | (void)close(pdes[1]); | |
104 | } else { | |
105 | iop = fdopen(pdes[1], type); | |
106 | (void)close(pdes[0]); | |
107 | } | |
108 | pids[fileno(iop)] = pid; | |
5f3a5fe7 | 109 | |
97f47643 | 110 | pfree: for (argc = 1; argv[argc] != NULL; argc++) { |
5f3a5fe7 | 111 | blkfree((char **)argv[argc]); |
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112 | free((char *)argv[argc]); |
113 | } | |
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114 | return(iop); |
115 | } | |
116 | ||
60de319b | 117 | int |
882508af | 118 | ftpd_pclose(iop) |
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119 | FILE *iop; |
120 | { | |
121 | register int fdes; | |
882508af MK |
122 | int omask; |
123 | union wait stat_loc; | |
124 | int pid; | |
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125 | |
126 | /* | |
127 | * pclose returns -1 if stream is not associated with a | |
128 | * `popened' command, or, if already `pclosed'. | |
129 | */ | |
882508af | 130 | if (pids == 0 || pids[fdes = fileno(iop)] == 0) |
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131 | return(-1); |
132 | (void)fclose(iop); | |
133 | omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); | |
5bb0ca89 | 134 | while ((pid = wait((int *)&stat_loc)) != pids[fdes] && pid != -1); |
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135 | (void)sigsetmask(omask); |
136 | pids[fdes] = 0; | |
882508af | 137 | return(pid == -1 ? -1 : stat_loc.w_status); |
96c0abd0 | 138 | } |