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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 | |||
| 3298 | post | 48 | /* TODO: create exec, exev, execve wrappers for task_spawn() */ |
| 49 | |||
| 50 | /* Easiest way to handle a shared + allocated string */ |
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| 3265 | post | 51 | char *found; |
| 52 | |||
| 53 | /* work-around for access() */ |
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| 54 | unsigned int try_access(const char *f) |
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| 55 | { |
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| 56 | int fd; |
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| 57 | |||
| 58 | fd = open(f, O_RDONLY); |
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| 3287 | post | 59 | if (fd > -1) { |
| 3265 | post | 60 | close(fd); |
| 3287 | post | 61 | return 0; |
| 3265 | post | 62 | } else |
| 3287 | post | 63 | return -1; |
| 3265 | post | 64 | } |
| 65 | |||
| 66 | /* Returns the full path of "cmd" if cmd is found, else just hand back |
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| 67 | * cmd as it was presented */ |
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| 68 | char *find_command(char *cmd) |
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| 69 | { |
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| 70 | char *path_orig, *path_tok; |
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| 71 | char *path[PATH_MAX]; |
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| 3287 | post | 72 | int n = 0, i = 0; |
| 3265 | post | 73 | size_t x = strlen(cmd) + 2; |
| 74 | |||
| 75 | found = (char *)malloc(PATH_MAX); |
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| 76 | |||
| 3287 | post | 77 | /* The user has specified a full or relative path, just give it back. */ |
| 3304 | post | 78 | if (-1 != try_access(cmd)) { |
| 3287 | post | 79 | return (char *) cmd; |
| 80 | } |
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| 3265 | post | 81 | path_orig = PATH; |
| 82 | path_tok = cli_strdup(path_orig); |
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| 83 | |||
| 84 | /* Extract the PATH env to a path[] array */ |
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| 85 | path[n] = cli_strtok(path_tok, PATH_DELIM); |
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| 86 | while (NULL != path[n]) { |
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| 87 | if ((strlen(path[n]) + x ) > PATH_MAX) { |
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| 88 | cli_error(CL_ENOTSUP, |
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| 89 | "Segment %d of path is too large, search ends at segment %d", |
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| 90 | n, n-1); |
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| 91 | break; |
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| 92 | } |
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| 93 | path[++n] = cli_strtok(NULL, PATH_DELIM); |
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| 94 | } |
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| 95 | |||
| 96 | /* We now have n places to look for the command */ |
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| 97 | for (i=0; path[i]; i++) { |
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| 98 | memset(found, 0, sizeof(found)); |
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| 99 | snprintf(found, PATH_MAX, "%s/%s", path[i], cmd); |
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| 3304 | post | 100 | if (-1 != try_access(found)) { |
| 3265 | post | 101 | free(path_tok); |
| 102 | return (char *) found; |
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| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | /* We didn't find it, just give it back as-is. Could be an alias |
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| 107 | * set in the parent shell */ |
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| 108 | free(path_tok); |
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| 109 | return (char *) cmd; |
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| 110 | } |
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| 111 | |||
| 112 | task_id_t try_exec(char *cmd, char **argv) |
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| 113 | { |
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| 114 | task_id_t tid; |
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| 115 | char *tmp; |
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| 116 | |||
| 117 | tmp = cli_strdup(find_command(cmd)); |
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| 118 | free(found); |
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| 119 | |||
| 3298 | post | 120 | /* TODO: put the cwd in front of tmp if tmp[0] != root |
| 121 | * which fixes relative paths fed to task_spawn */ |
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| 122 | |||
| 3265 | post | 123 | tid = task_spawn((const char *)tmp, (const char **)argv); |
| 124 | free(tmp); |
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| 125 | |||
| 126 | if (tid == 0) |
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| 127 | /* HelenOS does not set errno, so all we can do is report |
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| 128 | * a task ID of 0 as a generic failure. */ |
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| 129 | cli_error(CL_EEXEC, "Can not spawn %s", cmd); |
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| 130 | |||
| 131 | return tid; |
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| 132 | } |