projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 317350b1 DG |
1 | /* |
| 2 | * Copyright (c) 1993, David Greenman | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by David Greenman | |
| 16 | * 4. The name of the developer may be used to endorse or promote products | |
| 17 | * derived from this software without specific prior written permission. | |
| 18 | * | |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 29 | * SUCH DAMAGE. | |
| 30 | * | |
| 31 | * $Id: shell_imgact.c,v 1.3 1993/12/11 06:55:33 davidg Exp davidg $ | |
| 32 | */ | |
| 33 | ||
| 34 | #include "param.h" | |
| 35 | #include "systm.h" | |
| 36 | #include "resourcevar.h" | |
| 37 | #include "imgact.h" | |
| 38 | ||
| 39 | #define SHELLMAGIC 0x2123 /* #! */ | |
| 40 | #define MAXSHELLCMDLEN 64 | |
| 41 | ||
| 42 | /* | |
| 43 | * Shell interpreter image activator. A interpreter name beginning | |
| 44 | * at iparams->stringbase is the minimal successful exit requirement. | |
| 45 | */ | |
| 46 | int | |
| 47 | exec_shell_imgact(iparams) | |
| 48 | struct image_params *iparams; | |
| 49 | { | |
| 50 | const char *image_header = iparams->image_header; | |
| 51 | const char *ihp, *line_endp; | |
| 52 | int length; | |
| 53 | char *interp; | |
| 54 | char **argv; | |
| 55 | ||
| 56 | /* a shell script? */ | |
| 57 | if (((short *) image_header)[0] != SHELLMAGIC) | |
| 58 | return(-1); | |
| 59 | ||
| 60 | /* | |
| 61 | * Don't allow a shell script to be the shell for a shell | |
| 62 | * script. :-) | |
| 63 | */ | |
| 64 | if (iparams->interpreted) | |
| 65 | return(ENOEXEC); | |
| 66 | ||
| 67 | iparams->interpreted = 1; | |
| 68 | ||
| 69 | /* | |
| 70 | * Copy shell name and arguments from image_header into string | |
| 71 | * buffer. | |
| 72 | */ | |
| 73 | ||
| 74 | /* | |
| 75 | * Find end of line; return if the line > MAXSHELLCMDLEN long. | |
| 76 | */ | |
| 77 | for (ihp = &image_header[2]; *ihp != '\n'; ++ihp) { | |
| 78 | if (ihp >= &image_header[MAXSHELLCMDLEN]) | |
| 79 | return(ENOEXEC); | |
| 80 | } | |
| 81 | line_endp = ihp; | |
| 82 | ||
| 83 | /* reset for another pass */ | |
| 84 | ihp = &image_header[2]; | |
| 85 | ||
| 86 | /* Skip over leading spaces - until the interpreter name */ | |
| 87 | while ((*ihp == ' ') || (*ihp == '\t')) ihp++; | |
| 88 | ||
| 89 | /* copy the interpreter name */ | |
| 90 | interp = iparams->interpreter_name; | |
| 91 | while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t')) | |
| 92 | *interp++ = *ihp++; | |
| 93 | *interp = '\0'; | |
| 94 | ||
| 95 | /* Disallow a null interpreter filename */ | |
| 96 | if (*iparams->interpreter_name == '\0') | |
| 97 | return(ENOEXEC); | |
| 98 | ||
| 99 | /* reset for another pass */ | |
| 100 | ihp = &image_header[2]; | |
| 101 | ||
| 102 | /* copy the interpreter name and arguments */ | |
| 103 | while (ihp < line_endp) { | |
| 104 | /* Skip over leading spaces */ | |
| 105 | while ((*ihp == ' ') || (*ihp == '\t')) ihp++; | |
| 106 | ||
| 107 | if (ihp < line_endp) { | |
| 108 | /* | |
| 109 | * Copy to end of token. No need to watch stringspace | |
| 110 | * because this is at the front of the string buffer | |
| 111 | * and the maximum shell command length is tiny. | |
| 112 | */ | |
| 113 | while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t')) { | |
| 114 | *iparams->stringp++ = *ihp++; | |
| 115 | iparams->stringspace--; | |
| 116 | } | |
| 117 | ||
| 118 | *iparams->stringp++ = 0; | |
| 119 | iparams->stringspace--; | |
| 120 | ||
| 121 | iparams->argc++; | |
| 122 | } | |
| 123 | } | |
| 124 | ||
| 125 | /* set argv[0] to point to original file name */ | |
| 126 | suword(iparams->uap->argv, (int)iparams->uap->fname); | |
| 127 | ||
| 128 | return(0); | |
| 129 | } |