BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file find_program.h |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this 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" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Function that finds the absolute path of a program by checking a predefined |
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32 | * list of directories. |
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33 | */ |
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34 | |||
35 | #ifndef BADVPN_FIND_PROGRAM_H |
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36 | #define BADVPN_FIND_PROGRAM_H |
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37 | |||
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 | |||
42 | #include <misc/concat_strings.h> |
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43 | #include <misc/debug.h> |
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44 | #include <misc/balloc.h> |
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45 | |||
46 | static char * badvpn_find_program (const char *name); |
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47 | |||
48 | static char * badvpn_find_program (const char *name) |
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49 | { |
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50 | ASSERT(name) |
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51 | |||
52 | char *path = getenv("PATH"); |
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53 | if (path) { |
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54 | while (1) { |
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55 | size_t i = 0; |
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56 | while (path[i] != ':' && path[i] != '\0') { |
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57 | i++; |
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58 | } |
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59 | char const *src = path; |
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60 | size_t src_len = i; |
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61 | if (src_len == 0) { |
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62 | src = "."; |
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63 | src_len = 1; |
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64 | } |
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65 | size_t name_len = strlen(name); |
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66 | char *entry = BAllocSize(bsize_add(bsize_fromsize(src_len), bsize_add(bsize_fromsize(name_len), bsize_fromsize(2)))); |
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67 | if (!entry) { |
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68 | goto fail; |
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69 | } |
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70 | memcpy(entry, src, src_len); |
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71 | entry[src_len] = '/'; |
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72 | strcpy(entry + (src_len + 1), name); |
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73 | if (access(entry, X_OK) == 0) { |
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74 | return entry; |
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75 | } |
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76 | free(entry); |
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77 | if (path[i] == '\0') { |
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78 | break; |
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79 | } |
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80 | path += i + 1; |
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81 | } |
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82 | } |
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83 | |||
84 | const char *dirs[] = {"/usr/sbin", "/usr/bin", "/sbin", "/bin", NULL}; |
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85 | |||
86 | for (size_t i = 0; dirs[i]; i++) { |
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87 | char *try_path = concat_strings(3, dirs[i], "/", name); |
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88 | if (!try_path) { |
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89 | goto fail; |
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90 | } |
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91 | |||
92 | if (access(try_path, X_OK) == 0) { |
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93 | return try_path; |
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94 | } |
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95 | |||
96 | free(try_path); |
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97 | } |
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98 | |||
99 | fail: |
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100 | return NULL; |
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101 | } |
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102 | |||
103 | #endif |