Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 1 | #include <wordexp.h> |
| 2 | #include <unistd.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <limits.h> |
| 6 | #include <stdint.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <sys/wait.h> |
| 9 | #include <signal.h> |
| 10 | #include <errno.h> |
| 11 | #include <fcntl.h> |
| 12 | #include "pthread_impl.h" |
| 13 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 14 | static void reap(pid_t pid) { |
| 15 | int status; |
| 16 | for (;;) { |
| 17 | if (waitpid(pid, &status, 0) < 0) { |
| 18 | if (errno != EINTR) |
| 19 | return; |
| 20 | } else { |
| 21 | if (WIFEXITED(status)) |
| 22 | return; |
| 23 | } |
| 24 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 25 | } |
| 26 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 27 | static char* getword(FILE* f) { |
| 28 | char* s = 0; |
| 29 | return getdelim(&s, (size_t[1]){0}, 0, f) < 0 ? 0 : s; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 30 | } |
| 31 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 32 | static int do_wordexp(const char* s, wordexp_t* we, int flags) { |
| 33 | size_t i, l; |
| 34 | int sq = 0, dq = 0; |
| 35 | size_t np = 0; |
| 36 | char *w, **tmp; |
| 37 | char* redir = (flags & WRDE_SHOWERR) ? "" : "2>/dev/null"; |
| 38 | int err = 0; |
| 39 | FILE* f; |
| 40 | size_t wc = 0; |
| 41 | char** wv = 0; |
| 42 | int p[2]; |
| 43 | pid_t pid; |
| 44 | sigset_t set; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 45 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 46 | if (flags & WRDE_REUSE) |
| 47 | wordfree(we); |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 48 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 49 | if (flags & WRDE_NOCMD) |
| 50 | for (i = 0; s[i]; i++) |
| 51 | switch (s[i]) { |
| 52 | case '\\': |
| 53 | if (!sq) |
| 54 | i++; |
| 55 | break; |
| 56 | case '\'': |
| 57 | if (!dq) |
| 58 | sq ^= 1; |
| 59 | break; |
| 60 | case '"': |
| 61 | if (!sq) |
| 62 | dq ^= 1; |
| 63 | break; |
| 64 | case '(': |
| 65 | if (np) { |
| 66 | np++; |
| 67 | break; |
| 68 | } |
| 69 | case ')': |
| 70 | if (np) { |
| 71 | np--; |
| 72 | break; |
| 73 | } |
| 74 | case '\n': |
| 75 | case '|': |
| 76 | case '&': |
| 77 | case ';': |
| 78 | case '<': |
| 79 | case '>': |
| 80 | case '{': |
| 81 | case '}': |
| 82 | if (!(sq | dq | np)) |
| 83 | return WRDE_BADCHAR; |
| 84 | break; |
| 85 | case '$': |
| 86 | if (sq) |
| 87 | break; |
| 88 | if (s[i + 1] == '(' && s[i + 2] == '(') { |
| 89 | i += 2; |
| 90 | np += 2; |
| 91 | break; |
| 92 | } else if (s[i + 1] != '(') |
| 93 | break; |
| 94 | case '`': |
| 95 | if (sq) |
| 96 | break; |
| 97 | return WRDE_CMDSUB; |
| 98 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 99 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 100 | if (flags & WRDE_APPEND) { |
| 101 | wc = we->we_wordc; |
| 102 | wv = we->we_wordv; |
| 103 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 104 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 105 | i = wc; |
| 106 | if (flags & WRDE_DOOFFS) { |
| 107 | if (we->we_offs > SIZE_MAX / sizeof(void*) / 4) |
| 108 | goto nospace; |
| 109 | i += we->we_offs; |
| 110 | } else { |
| 111 | we->we_offs = 0; |
| 112 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 113 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 114 | if (pipe2(p, O_CLOEXEC) < 0) |
| 115 | goto nospace; |
| 116 | __block_all_sigs(&set); |
| 117 | pid = fork(); |
| 118 | __restore_sigs(&set); |
| 119 | if (pid < 0) { |
| 120 | close(p[0]); |
| 121 | close(p[1]); |
| 122 | goto nospace; |
| 123 | } |
| 124 | if (!pid) { |
| 125 | if (p[1] == 1) |
| 126 | fcntl(1, F_SETFD, 0); |
| 127 | else |
| 128 | dup2(p[1], 1); |
| 129 | execl("/bin/sh", "sh", "-c", "eval \"printf %s\\\\\\\\0 x $1 $2\"", "sh", s, |
| 130 | redir, (char*)0); |
| 131 | _exit(1); |
| 132 | } |
| 133 | close(p[1]); |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 134 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 135 | f = fdopen(p[0], "r"); |
| 136 | if (!f) { |
| 137 | close(p[0]); |
| 138 | kill(pid, SIGKILL); |
| 139 | reap(pid); |
| 140 | goto nospace; |
| 141 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 142 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 143 | l = wv ? i + 1 : 0; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 144 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 145 | free(getword(f)); |
| 146 | if (feof(f)) { |
| 147 | fclose(f); |
| 148 | reap(pid); |
| 149 | return WRDE_SYNTAX; |
| 150 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 151 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 152 | while ((w = getword(f))) { |
| 153 | if (i + 1 >= l) { |
| 154 | l += l / 2 + 10; |
| 155 | tmp = realloc(wv, l * sizeof(char*)); |
| 156 | if (!tmp) |
| 157 | break; |
| 158 | wv = tmp; |
| 159 | } |
| 160 | wv[i++] = w; |
| 161 | wv[i] = 0; |
| 162 | } |
| 163 | if (!feof(f)) |
| 164 | err = WRDE_NOSPACE; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 165 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 166 | fclose(f); |
| 167 | reap(pid); |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 168 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 169 | if (!wv) |
| 170 | wv = calloc(i + 1, sizeof *wv); |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 171 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 172 | we->we_wordv = wv; |
| 173 | we->we_wordc = i; |
| 174 | |
| 175 | if (flags & WRDE_DOOFFS) { |
| 176 | if (wv) |
| 177 | for (i = we->we_offs; i; i--) |
| 178 | we->we_wordv[i - 1] = 0; |
| 179 | we->we_wordc -= we->we_offs; |
| 180 | } |
| 181 | return err; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 182 | |
| 183 | nospace: |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 184 | if (!(flags & WRDE_APPEND)) { |
| 185 | we->we_wordc = 0; |
| 186 | we->we_wordv = 0; |
| 187 | } |
| 188 | return WRDE_NOSPACE; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 189 | } |
| 190 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 191 | int wordexp(const char* restrict s, wordexp_t* restrict we, int flags) { |
| 192 | int r, cs; |
| 193 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
| 194 | r = do_wordexp(s, we, flags); |
| 195 | pthread_setcancelstate(cs, 0); |
| 196 | return r; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 197 | } |
| 198 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 199 | void wordfree(wordexp_t* we) { |
| 200 | size_t i; |
| 201 | if (!we->we_wordv) |
| 202 | return; |
| 203 | for (i = 0; i < we->we_wordc; i++) |
| 204 | free(we->we_wordv[we->we_offs + i]); |
| 205 | free(we->we_wordv); |
| 206 | we->we_wordv = 0; |
| 207 | we->we_wordc = 0; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 208 | } |