| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Adapted from ash applet code
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Copyright (c) 1989, 1991, 1993, 1994
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| 9 | * The Regents of the University of California. All rights reserved.
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| 10 | *
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| 11 | * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
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| 12 | * was re-ported from NetBSD and debianized.
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| 13 | *
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| 14 | * Copyright (c) 2010 Denys Vlasenko
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| 15 | * Split from ash.c
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| 16 | *
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| 17 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 18 | */
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| 19 | #include "libbb.h"
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| 20 | #include "shell_common.h"
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| 21 | #include <sys/resource.h> /* getrlimit */
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| 22 |
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| 23 | const char defifsvar[] ALIGN1 = "IFS= \t\n";
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| 24 |
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| 25 |
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| 26 | int FAST_FUNC is_well_formed_var_name(const char *s, char terminator)
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| 27 | {
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| 28 | if (!s || !(isalpha(*s) || *s == '_'))
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| 29 | return 0;
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| 30 |
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| 31 | do
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| 32 | s++;
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| 33 | while (isalnum(*s) || *s == '_');
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| 34 |
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| 35 | return *s == terminator;
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| 36 | }
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| 37 |
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| 38 | /* read builtin */
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| 39 |
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| 40 | /* Needs to be interruptible: shell must handle traps and shell-special signals
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| 41 | * while inside read. To implement this, be sure to not loop on EINTR
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| 42 | * and return errno == EINTR reliably.
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| 43 | */
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| 44 | //TODO: use more efficient setvar() which takes a pointer to malloced "VAR=VAL"
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| 45 | //string. hush naturally has it, and ash has setvareq().
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| 46 | //Here we can simply store "VAR=" at buffer start and store read data directly
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| 47 | //after "=", then pass buffer to setvar() to consume.
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| 48 | const char* FAST_FUNC
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| 49 | shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
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| 50 | char **argv,
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| 51 | const char *ifs,
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| 52 | int read_flags,
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| 53 | const char *opt_n,
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| 54 | const char *opt_p,
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| 55 | const char *opt_t,
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| 56 | const char *opt_u
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| 57 | )
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| 58 | {
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| 59 | unsigned err;
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| 60 | unsigned end_ms; /* -t TIMEOUT */
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| 61 | int fd; /* -u FD */
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| 62 | int nchars; /* -n NUM */
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| 63 | char **pp;
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| 64 | char *buffer;
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| 65 | struct termios tty, old_tty;
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| 66 | const char *retval;
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| 67 | int bufpos; /* need to be able to hold -1 */
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| 68 | int startword;
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| 69 | smallint backslash;
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| 70 |
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| 71 | errno = err = 0;
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| 72 |
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| 73 | pp = argv;
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| 74 | while (*pp) {
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| 75 | if (!is_well_formed_var_name(*pp, '\0')) {
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| 76 | /* Mimic bash message */
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| 77 | bb_error_msg("read: '%s': not a valid identifier", *pp);
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| 78 | return (const char *)(uintptr_t)1;
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| 79 | }
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| 80 | pp++;
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| 81 | }
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| 82 |
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| 83 | nchars = 0; /* if != 0, -n is in effect */
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| 84 | if (opt_n) {
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| 85 | nchars = bb_strtou(opt_n, NULL, 10);
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| 86 | if (nchars < 0 || errno)
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| 87 | return "invalid count";
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| 88 | /* note: "-n 0": off (bash 3.2 does this too) */
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| 89 | }
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| 90 | end_ms = 0;
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| 91 | if (opt_t) {
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| 92 | end_ms = bb_strtou(opt_t, NULL, 10);
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| 93 | if (errno || end_ms > UINT_MAX / 2048)
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| 94 | return "invalid timeout";
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| 95 | end_ms *= 1000;
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| 96 | #if 0 /* even bash has no -t N.NNN support */
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| 97 | ts.tv_sec = bb_strtou(opt_t, &p, 10);
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| 98 | ts.tv_usec = 0;
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| 99 | /* EINVAL means number is ok, but not terminated by NUL */
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| 100 | if (*p == '.' && errno == EINVAL) {
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| 101 | char *p2;
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| 102 | if (*++p) {
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| 103 | int scale;
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| 104 | ts.tv_usec = bb_strtou(p, &p2, 10);
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| 105 | if (errno)
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| 106 | return "invalid timeout";
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| 107 | scale = p2 - p;
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| 108 | /* normalize to usec */
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| 109 | if (scale > 6)
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| 110 | return "invalid timeout";
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| 111 | while (scale++ < 6)
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| 112 | ts.tv_usec *= 10;
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| 113 | }
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| 114 | } else if (ts.tv_sec < 0 || errno) {
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| 115 | return "invalid timeout";
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| 116 | }
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| 117 | if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
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| 118 | return "invalid timeout";
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| 119 | }
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| 120 | #endif /* if 0 */
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| 121 | }
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| 122 | fd = STDIN_FILENO;
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| 123 | if (opt_u) {
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| 124 | fd = bb_strtou(opt_u, NULL, 10);
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| 125 | if (fd < 0 || errno)
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| 126 | return "invalid file descriptor";
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| 127 | }
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| 128 |
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| 129 | if (opt_p && isatty(fd)) {
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| 130 | fputs(opt_p, stderr);
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| 131 | fflush_all();
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| 132 | }
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| 133 |
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| 134 | if (ifs == NULL)
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| 135 | ifs = defifs;
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| 136 |
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| 137 | if (nchars || (read_flags & BUILTIN_READ_SILENT)) {
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| 138 | tcgetattr(fd, &tty);
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| 139 | old_tty = tty;
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| 140 | if (nchars) {
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| 141 | tty.c_lflag &= ~ICANON;
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| 142 | // Setting it to more than 1 breaks poll():
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| 143 | // it blocks even if there's data. !??
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| 144 | //tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
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| 145 | /* reads would block only if < 1 char is available */
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| 146 | tty.c_cc[VMIN] = 1;
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| 147 | /* no timeout (reads block forever) */
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| 148 | tty.c_cc[VTIME] = 0;
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| 149 | }
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| 150 | if (read_flags & BUILTIN_READ_SILENT) {
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| 151 | tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
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| 152 | }
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| 153 | /* This forces execution of "restoring" tcgetattr later */
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| 154 | read_flags |= BUILTIN_READ_SILENT;
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| 155 | /* if tcgetattr failed, tcsetattr will fail too.
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| 156 | * Ignoring, it's harmless. */
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| 157 | tcsetattr(fd, TCSANOW, &tty);
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| 158 | }
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| 159 |
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| 160 | retval = (const char *)(uintptr_t)0;
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| 161 | startword = 1;
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| 162 | backslash = 0;
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| 163 | if (end_ms) /* NB: end_ms stays nonzero: */
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| 164 | end_ms = ((unsigned)monotonic_ms() + end_ms) | 1;
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| 165 | buffer = NULL;
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| 166 | bufpos = 0;
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| 167 | do {
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| 168 | char c;
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| 169 | struct pollfd pfd[1];
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| 170 | int timeout;
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| 171 |
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| 172 | if ((bufpos & 0xff) == 0)
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| 173 | buffer = xrealloc(buffer, bufpos + 0x101);
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| 174 |
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| 175 | timeout = -1;
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| 176 | if (end_ms) {
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| 177 | timeout = end_ms - (unsigned)monotonic_ms();
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| 178 | if (timeout <= 0) { /* already late? */
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| 179 | retval = (const char *)(uintptr_t)1;
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| 180 | goto ret;
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| 181 | }
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| 182 | }
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| 183 |
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| 184 | /* We must poll even if timeout is -1:
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| 185 | * we want to be interrupted if signal arrives,
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| 186 | * regardless of SA_RESTART-ness of that signal!
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| 187 | */
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| 188 | errno = 0;
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| 189 | pfd[0].fd = fd;
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| 190 | pfd[0].events = POLLIN;
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| 191 | if (poll(pfd, 1, timeout) != 1) {
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| 192 | /* timed out, or EINTR */
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| 193 | err = errno;
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| 194 | retval = (const char *)(uintptr_t)1;
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| 195 | goto ret;
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| 196 | }
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| 197 | if (read(fd, &buffer[bufpos], 1) != 1) {
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| 198 | err = errno;
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| 199 | retval = (const char *)(uintptr_t)1;
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| 200 | break;
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| 201 | }
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| 202 |
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| 203 | c = buffer[bufpos];
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| 204 | if (c == '\0')
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| 205 | continue;
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| 206 | if (backslash) {
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| 207 | backslash = 0;
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| 208 | if (c != '\n')
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| 209 | goto put;
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| 210 | continue;
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| 211 | }
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| 212 | if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
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| 213 | backslash = 1;
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| 214 | continue;
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| 215 | }
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| 216 | if (c == '\n')
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| 217 | break;
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| 218 |
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| 219 | /* $IFS splitting. NOT done if we run "read"
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| 220 | * without variable names (bash compat).
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| 221 | * Thus, "read" and "read REPLY" are not the same.
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| 222 | */
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| 223 | if (argv[0]) {
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| 224 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
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| 225 | const char *is_ifs = strchr(ifs, c);
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| 226 | if (startword && is_ifs) {
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| 227 | if (isspace(c))
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| 228 | continue;
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| 229 | /* it is a non-space ifs char */
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| 230 | startword--;
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| 231 | if (startword == 1) /* first one? */
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| 232 | continue; /* yes, it is not next word yet */
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| 233 | }
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| 234 | startword = 0;
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| 235 | if (argv[1] != NULL && is_ifs) {
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| 236 | buffer[bufpos] = '\0';
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| 237 | bufpos = 0;
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| 238 | setvar(*argv, buffer);
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| 239 | argv++;
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| 240 | /* can we skip one non-space ifs char? (2: yes) */
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| 241 | startword = isspace(c) ? 2 : 1;
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| 242 | continue;
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| 243 | }
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| 244 | }
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| 245 | put:
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| 246 | bufpos++;
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| 247 | } while (--nchars);
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| 248 |
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| 249 | if (argv[0]) {
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| 250 | /* Remove trailing space $IFS chars */
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| 251 | while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL)
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| 252 | continue;
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| 253 | buffer[bufpos + 1] = '\0';
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| 254 | /* Use the remainder as a value for the next variable */
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| 255 | setvar(*argv, buffer);
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| 256 | /* Set the rest to "" */
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| 257 | while (*++argv)
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| 258 | setvar(*argv, "");
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| 259 | } else {
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| 260 | /* Note: no $IFS removal */
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| 261 | buffer[bufpos] = '\0';
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| 262 | setvar("REPLY", buffer);
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| 263 | }
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| 264 |
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| 265 | ret:
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| 266 | free(buffer);
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| 267 | if (read_flags & BUILTIN_READ_SILENT)
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| 268 | tcsetattr(fd, TCSANOW, &old_tty);
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| 269 |
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| 270 | errno = err;
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| 271 | return retval;
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| 272 | }
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| 273 |
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| 274 | /* ulimit builtin */
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| 275 |
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| 276 | struct limits {
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| 277 | uint8_t cmd; /* RLIMIT_xxx fit into it */
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| 278 | uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
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| 279 | char option;
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| 280 | const char *name;
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| 281 | };
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| 282 |
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| 283 | static const struct limits limits_tbl[] = {
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| 284 | #ifdef RLIMIT_FSIZE
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| 285 | { RLIMIT_FSIZE, 9, 'f', "file size (blocks)" },
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| 286 | #endif
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| 287 | #ifdef RLIMIT_CPU
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| 288 | { RLIMIT_CPU, 0, 't', "cpu time (seconds)" },
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| 289 | #endif
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| 290 | #ifdef RLIMIT_DATA
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| 291 | { RLIMIT_DATA, 10, 'd', "data seg size (kb)" },
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| 292 | #endif
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| 293 | #ifdef RLIMIT_STACK
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| 294 | { RLIMIT_STACK, 10, 's', "stack size (kb)" },
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| 295 | #endif
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| 296 | #ifdef RLIMIT_CORE
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| 297 | { RLIMIT_CORE, 9, 'c', "core file size (blocks)" },
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| 298 | #endif
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| 299 | #ifdef RLIMIT_RSS
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| 300 | { RLIMIT_RSS, 10, 'm', "resident set size (kb)" },
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| 301 | #endif
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| 302 | #ifdef RLIMIT_MEMLOCK
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| 303 | { RLIMIT_MEMLOCK, 10, 'l', "locked memory (kb)" },
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| 304 | #endif
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| 305 | #ifdef RLIMIT_NPROC
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| 306 | { RLIMIT_NPROC, 0, 'p', "processes" },
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| 307 | #endif
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| 308 | #ifdef RLIMIT_NOFILE
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| 309 | { RLIMIT_NOFILE, 0, 'n', "file descriptors" },
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| 310 | #endif
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| 311 | #ifdef RLIMIT_AS
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| 312 | { RLIMIT_AS, 10, 'v', "address space (kb)" },
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| 313 | #endif
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| 314 | #ifdef RLIMIT_LOCKS
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| 315 | { RLIMIT_LOCKS, 0, 'w', "locks" },
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| 316 | #endif
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| 317 | #ifdef RLIMIT_NICE
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| 318 | { RLIMIT_NICE, 0, 'e', "scheduling priority" },
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| 319 | #endif
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| 320 | #ifdef RLIMIT_RTPRIO
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| 321 | { RLIMIT_RTPRIO, 0, 'r', "real-time priority" },
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| 322 | #endif
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| 323 | };
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| 324 |
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| 325 | enum {
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| 326 | OPT_hard = (1 << 0),
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| 327 | OPT_soft = (1 << 1),
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| 328 | };
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| 329 |
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| 330 | /* "-": treat args as parameters of option with ASCII code 1 */
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| 331 | static const char ulimit_opt_string[] ALIGN1 = "-HSa"
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| 332 | #ifdef RLIMIT_FSIZE
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| 333 | "f::"
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| 334 | #endif
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| 335 | #ifdef RLIMIT_CPU
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| 336 | "t::"
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| 337 | #endif
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| 338 | #ifdef RLIMIT_DATA
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| 339 | "d::"
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| 340 | #endif
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| 341 | #ifdef RLIMIT_STACK
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| 342 | "s::"
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| 343 | #endif
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| 344 | #ifdef RLIMIT_CORE
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| 345 | "c::"
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| 346 | #endif
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| 347 | #ifdef RLIMIT_RSS
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| 348 | "m::"
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| 349 | #endif
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| 350 | #ifdef RLIMIT_MEMLOCK
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| 351 | "l::"
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| 352 | #endif
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| 353 | #ifdef RLIMIT_NPROC
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| 354 | "p::"
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| 355 | #endif
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| 356 | #ifdef RLIMIT_NOFILE
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| 357 | "n::"
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| 358 | #endif
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| 359 | #ifdef RLIMIT_AS
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| 360 | "v::"
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| 361 | #endif
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| 362 | #ifdef RLIMIT_LOCKS
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| 363 | "w::"
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| 364 | #endif
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| 365 | #ifdef RLIMIT_NICE
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| 366 | "e::"
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| 367 | #endif
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| 368 | #ifdef RLIMIT_RTPRIO
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| 369 | "r::"
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| 370 | #endif
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| 371 | ;
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| 372 |
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| 373 | static void printlim(unsigned opts, const struct rlimit *limit,
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| 374 | const struct limits *l)
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| 375 | {
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| 376 | rlim_t val;
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| 377 |
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| 378 | val = limit->rlim_max;
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| 379 | if (!(opts & OPT_hard))
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| 380 | val = limit->rlim_cur;
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| 381 |
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| 382 | if (val == RLIM_INFINITY)
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| 383 | puts("unlimited");
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| 384 | else {
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| 385 | val >>= l->factor_shift;
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| 386 | printf("%llu\n", (long long) val);
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| 387 | }
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| 388 | }
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| 389 |
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| 390 | int FAST_FUNC
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| 391 | shell_builtin_ulimit(char **argv)
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| 392 | {
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| 393 | unsigned opts;
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| 394 | unsigned argc;
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| 395 |
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| 396 | /* We can't use getopt32: need to handle commands like
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| 397 | * ulimit 123 -c2 -l 456
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| 398 | */
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| 399 |
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| 400 | /* In case getopt was already called:
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| 401 | * reset the libc getopt() function, which keeps internal state.
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| 402 | */
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| 403 | #ifdef __GLIBC__
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| 404 | optind = 0;
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| 405 | #else /* BSD style */
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| 406 | optind = 1;
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| 407 | /* optreset = 1; */
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| 408 | #endif
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| 409 | /* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
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| 410 |
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| 411 | argc = 1;
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| 412 | while (argv[argc])
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| 413 | argc++;
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| 414 |
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| 415 | opts = 0;
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|---|
| 416 | while (1) {
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| 417 | struct rlimit limit;
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| 418 | const struct limits *l;
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| 419 | int opt_char = getopt(argc, argv, ulimit_opt_string);
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| 420 |
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| 421 | if (opt_char == -1)
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| 422 | break;
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| 423 | if (opt_char == 'H') {
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| 424 | opts |= OPT_hard;
|
|---|
| 425 | continue;
|
|---|
| 426 | }
|
|---|
| 427 | if (opt_char == 'S') {
|
|---|
| 428 | opts |= OPT_soft;
|
|---|
| 429 | continue;
|
|---|
| 430 | }
|
|---|
| 431 |
|
|---|
| 432 | if (opt_char == 'a') {
|
|---|
| 433 | for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
|
|---|
| 434 | getrlimit(l->cmd, &limit);
|
|---|
| 435 | printf("-%c: %-30s ", l->option, l->name);
|
|---|
| 436 | printlim(opts, &limit, l);
|
|---|
| 437 | }
|
|---|
| 438 | continue;
|
|---|
| 439 | }
|
|---|
| 440 |
|
|---|
| 441 | if (opt_char == 1)
|
|---|
| 442 | opt_char = 'f';
|
|---|
| 443 | for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
|
|---|
| 444 | if (opt_char == l->option) {
|
|---|
| 445 | char *val_str;
|
|---|
| 446 |
|
|---|
| 447 | getrlimit(l->cmd, &limit);
|
|---|
| 448 |
|
|---|
| 449 | val_str = optarg;
|
|---|
| 450 | if (!val_str && argv[optind] && argv[optind][0] != '-')
|
|---|
| 451 | val_str = argv[optind++]; /* ++ skips NN in "-c NN" case */
|
|---|
| 452 | if (val_str) {
|
|---|
| 453 | rlim_t val;
|
|---|
| 454 |
|
|---|
| 455 | if (strcmp(val_str, "unlimited") == 0)
|
|---|
| 456 | val = RLIM_INFINITY;
|
|---|
| 457 | else {
|
|---|
| 458 | if (sizeof(val) == sizeof(int))
|
|---|
| 459 | val = bb_strtou(val_str, NULL, 10);
|
|---|
| 460 | else if (sizeof(val) == sizeof(long))
|
|---|
| 461 | val = bb_strtoul(val_str, NULL, 10);
|
|---|
| 462 | else
|
|---|
| 463 | val = bb_strtoull(val_str, NULL, 10);
|
|---|
| 464 | if (errno) {
|
|---|
| 465 | bb_error_msg("invalid number '%s'", val_str);
|
|---|
| 466 | return EXIT_FAILURE;
|
|---|
| 467 | }
|
|---|
| 468 | val <<= l->factor_shift;
|
|---|
| 469 | }
|
|---|
| 470 | //bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val);
|
|---|
| 471 | /* from man bash: "If neither -H nor -S
|
|---|
| 472 | * is specified, both the soft and hard
|
|---|
| 473 | * limits are set. */
|
|---|
| 474 | if (!opts)
|
|---|
| 475 | opts = OPT_hard + OPT_soft;
|
|---|
| 476 | if (opts & OPT_hard)
|
|---|
| 477 | limit.rlim_max = val;
|
|---|
| 478 | if (opts & OPT_soft)
|
|---|
| 479 | limit.rlim_cur = val;
|
|---|
| 480 | //bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max);
|
|---|
| 481 | if (setrlimit(l->cmd, &limit) < 0) {
|
|---|
| 482 | bb_perror_msg("error setting limit");
|
|---|
| 483 | return EXIT_FAILURE;
|
|---|
| 484 | }
|
|---|
| 485 | } else {
|
|---|
| 486 | printlim(opts, &limit, l);
|
|---|
| 487 | }
|
|---|
| 488 | break;
|
|---|
| 489 | }
|
|---|
| 490 | } /* for (every possible opt) */
|
|---|
| 491 |
|
|---|
| 492 | if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) {
|
|---|
| 493 | /* bad option. getopt already complained. */
|
|---|
| 494 | break;
|
|---|
| 495 | }
|
|---|
| 496 | } /* while (there are options) */
|
|---|
| 497 |
|
|---|
| 498 | return 0;
|
|---|
| 499 | }
|
|---|
