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| Rev | Author | Line No. | Line |
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| 3265 | post | 1 | /* Copyright (c) 2008, Tim Post <tinkertim@gmail.com> |
| 2 | * All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions are met: |
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| 6 | * |
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| 7 | * Redistributions of source code must retain the above copyright notice, this |
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| 8 | * list of conditions and the following disclaimer. |
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| 9 | * |
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| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
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| 11 | * this list of conditions and the following disclaimer in the documentation |
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| 12 | * and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * Neither the name of the original program's authors nor the names of its |
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| 15 | * contributors may be used to endorse or promote products derived from this |
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| 16 | * software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | * POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |||
| 31 | /* The VERY basics of execute in place support. These are buggy, leaky |
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| 32 | * and not nearly done. Only here for beta testing!! You were warned!! |
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| 33 | * TODO: |
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| 34 | * Hash command lookups to save time |
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| 35 | * Create a running pointer to **path and advance/rewind it as we go */ |
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| 36 | |||
| 37 | #include <stdio.h> |
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| 38 | #include <stdlib.h> |
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| 39 | #include <unistd.h> |
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| 40 | #include <string.h> |
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| 41 | #include <fcntl.h> |
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| 42 | |||
| 43 | #include "config.h" |
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| 44 | #include "util.h" |
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| 45 | #include "exec.h" |
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| 46 | #include "errors.h" |
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| 47 | |||
| 3340 | post | 48 | /* FIXME: Just have find_command() return an allocated string */ |
| 3474 | svoboda | 49 | static char *found; |
| 3265 | post | 50 | |
| 3372 | post | 51 | static char *find_command(char *); |
| 3474 | svoboda | 52 | static int try_access(const char *); |
| 3372 | post | 53 | |
| 3265 | post | 54 | /* work-around for access() */ |
| 3474 | svoboda | 55 | static int try_access(const char *f) |
| 3265 | post | 56 | { |
| 57 | int fd; |
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| 58 | |||
| 59 | fd = open(f, O_RDONLY); |
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| 3287 | post | 60 | if (fd > -1) { |
| 3265 | post | 61 | close(fd); |
| 3287 | post | 62 | return 0; |
| 3265 | post | 63 | } else |
| 3287 | post | 64 | return -1; |
| 3265 | post | 65 | } |
| 66 | |||
| 67 | /* Returns the full path of "cmd" if cmd is found, else just hand back |
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| 68 | * cmd as it was presented */ |
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| 3372 | post | 69 | static char *find_command(char *cmd) |
| 3265 | post | 70 | { |
| 3366 | post | 71 | char *path_tok; |
| 3265 | post | 72 | char *path[PATH_MAX]; |
| 3287 | post | 73 | int n = 0, i = 0; |
| 3265 | post | 74 | size_t x = strlen(cmd) + 2; |
| 75 | |||
| 76 | found = (char *)malloc(PATH_MAX); |
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| 77 | |||
| 3287 | post | 78 | /* The user has specified a full or relative path, just give it back. */ |
| 3304 | post | 79 | if (-1 != try_access(cmd)) { |
| 3287 | post | 80 | return (char *) cmd; |
| 81 | } |
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| 3265 | post | 82 | |
| 4341 | svoboda | 83 | path_tok = strdup(PATH); |
| 3366 | post | 84 | |
| 3265 | post | 85 | /* Extract the PATH env to a path[] array */ |
| 4341 | svoboda | 86 | path[n] = strtok(path_tok, PATH_DELIM); |
| 3265 | post | 87 | while (NULL != path[n]) { |
| 88 | if ((strlen(path[n]) + x ) > PATH_MAX) { |
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| 89 | cli_error(CL_ENOTSUP, |
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| 90 | "Segment %d of path is too large, search ends at segment %d", |
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| 91 | n, n-1); |
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| 92 | break; |
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| 93 | } |
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| 4341 | svoboda | 94 | path[++n] = strtok(NULL, PATH_DELIM); |
| 3265 | post | 95 | } |
| 96 | |||
| 97 | /* We now have n places to look for the command */ |
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| 98 | for (i=0; path[i]; i++) { |
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| 99 | memset(found, 0, sizeof(found)); |
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| 100 | snprintf(found, PATH_MAX, "%s/%s", path[i], cmd); |
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| 3304 | post | 101 | if (-1 != try_access(found)) { |
| 3265 | post | 102 | free(path_tok); |
| 103 | return (char *) found; |
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| 104 | } |
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| 105 | } |
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| 106 | |||
| 3340 | post | 107 | /* We didn't find it, just give it back as-is. */ |
| 3265 | post | 108 | free(path_tok); |
| 109 | return (char *) cmd; |
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| 110 | } |
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| 111 | |||
| 3340 | post | 112 | unsigned int try_exec(char *cmd, char **argv) |
| 3265 | post | 113 | { |
| 114 | task_id_t tid; |
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| 115 | char *tmp; |
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| 116 | |||
| 4341 | svoboda | 117 | tmp = strdup(find_command(cmd)); |
| 3265 | post | 118 | free(found); |
| 119 | |||
| 3535 | svoboda | 120 | tid = task_spawn((const char *)tmp, argv); |
| 3265 | post | 121 | free(tmp); |
| 122 | |||
| 3340 | post | 123 | if (tid == 0) { |
| 4346 | svoboda | 124 | cli_error(CL_EEXEC, "Cannot spawn `%s'.", cmd); |
| 3340 | post | 125 | return 1; |
| 126 | } else { |
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| 127 | return 0; |
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| 128 | } |
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| 3265 | post | 129 | } |