[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 | #if ENABLE_FEATURE_SYSLOG
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| 11 | # include <syslog.h>
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| 12 | #endif
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| 13 |
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| 14 | smallint logmode = LOGMODE_STDIO;
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| 15 | const char *msg_eol = "\n";
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| 16 |
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| 17 | void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
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| 18 | {
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| 19 | char *msg, *msg1;
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| 20 | int applet_len, strerr_len, msgeol_len, used;
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| 21 |
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| 22 | if (!logmode)
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| 23 | return;
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| 24 |
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| 25 | if (!s) /* nomsg[_and_die] uses NULL fmt */
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| 26 | s = ""; /* some libc don't like printf(NULL) */
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| 27 |
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| 28 | used = vasprintf(&msg, s, p);
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| 29 | if (used < 0)
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| 30 | return;
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| 31 |
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| 32 | /* This is ugly and costs +60 bytes compared to multiple
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| 33 | * fprintf's, but is guaranteed to do a single write.
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| 34 | * This is needed for e.g. httpd logging, when multiple
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| 35 | * children can produce log messages simultaneously. */
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| 36 |
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| 37 | applet_len = strlen(applet_name) + 2; /* "applet: " */
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| 38 | strerr_len = strerr ? strlen(strerr) : 0;
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| 39 | msgeol_len = strlen(msg_eol);
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| 40 | /* can't use xrealloc: it calls error_msg on failure,
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| 41 | * that may result in a recursion */
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| 42 | /* +3 is for ": " before strerr and for terminating NUL */
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| 43 | msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
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| 44 | if (!msg1) {
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| 45 | msg[used++] = '\n'; /* overwrites NUL */
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| 46 | applet_len = 0;
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| 47 | } else {
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| 48 | msg = msg1;
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| 49 | /* TODO: maybe use writev instead of memmoving? Need full_writev? */
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| 50 | memmove(msg + applet_len, msg, used);
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| 51 | used += applet_len;
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| 52 | strcpy(msg, applet_name);
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| 53 | msg[applet_len - 2] = ':';
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| 54 | msg[applet_len - 1] = ' ';
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| 55 | if (strerr) {
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| 56 | if (s[0]) { /* not perror_nomsg? */
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| 57 | msg[used++] = ':';
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| 58 | msg[used++] = ' ';
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| 59 | }
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| 60 | strcpy(&msg[used], strerr);
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| 61 | used += strerr_len;
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| 62 | }
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| 63 | strcpy(&msg[used], msg_eol);
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| 64 | used += msgeol_len;
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| 65 | }
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| 66 |
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| 67 | if (logmode & LOGMODE_STDIO) {
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| 68 | fflush_all();
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| 69 | full_write(STDERR_FILENO, msg, used);
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| 70 | }
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| 71 | #if ENABLE_FEATURE_SYSLOG
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| 72 | if (logmode & LOGMODE_SYSLOG) {
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| 73 | syslog(LOG_ERR, "%s", msg + applet_len);
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| 74 | }
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| 75 | #endif
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| 76 | free(msg);
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| 77 | }
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| 78 |
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| 79 | #ifdef VERSION_WITH_WRITEV
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| 80 | /* Code size is approximately the same, but currently it's the only user
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| 81 | * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
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| 82 | void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
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| 83 | {
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| 84 | int strerr_len, msgeol_len;
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| 85 | struct iovec iov[3];
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| 86 |
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| 87 | #define used (iov[2].iov_len)
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| 88 | #define msgv (iov[2].iov_base)
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| 89 | #define msgc ((char*)(iov[2].iov_base))
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| 90 | #define msgptr (&(iov[2].iov_base))
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| 91 |
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| 92 | if (!logmode)
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| 93 | return;
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| 94 |
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| 95 | if (!s) /* nomsg[_and_die] uses NULL fmt */
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| 96 | s = ""; /* some libc don't like printf(NULL) */
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| 97 |
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| 98 | /* Prevent "derefing type-punned ptr will break aliasing rules" */
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| 99 | used = vasprintf((char**)(void*)msgptr, s, p);
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| 100 | if (used < 0)
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| 101 | return;
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| 102 |
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| 103 | /* This is ugly and costs +60 bytes compared to multiple
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| 104 | * fprintf's, but is guaranteed to do a single write.
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| 105 | * This is needed for e.g. httpd logging, when multiple
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| 106 | * children can produce log messages simultaneously. */
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| 107 |
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| 108 | strerr_len = strerr ? strlen(strerr) : 0;
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| 109 | msgeol_len = strlen(msg_eol);
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| 110 | /* +3 is for ": " before strerr and for terminating NUL */
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| 111 | msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
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| 112 | if (strerr) {
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| 113 | msgc[used++] = ':';
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| 114 | msgc[used++] = ' ';
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| 115 | strcpy(msgc + used, strerr);
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| 116 | used += strerr_len;
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| 117 | }
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| 118 | strcpy(msgc + used, msg_eol);
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| 119 | used += msgeol_len;
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| 120 |
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| 121 | if (logmode & LOGMODE_STDIO) {
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| 122 | iov[0].iov_base = (char*)applet_name;
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| 123 | iov[0].iov_len = strlen(applet_name);
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| 124 | iov[1].iov_base = (char*)": ";
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| 125 | iov[1].iov_len = 2;
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| 126 | /*iov[2].iov_base = msgc;*/
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| 127 | /*iov[2].iov_len = used;*/
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| 128 | fflush_all();
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| 129 | writev(STDERR_FILENO, iov, 3);
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| 130 | }
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| 131 | # if ENABLE_FEATURE_SYSLOG
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| 132 | if (logmode & LOGMODE_SYSLOG) {
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| 133 | syslog(LOG_ERR, "%s", msgc);
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| 134 | }
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| 135 | # endif
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| 136 | free(msgc);
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| 137 | }
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| 138 | #endif
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| 139 |
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| 140 |
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| 141 | void FAST_FUNC bb_error_msg_and_die(const char *s, ...)
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| 142 | {
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| 143 | va_list p;
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| 144 |
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| 145 | va_start(p, s);
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| 146 | bb_verror_msg(s, p, NULL);
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| 147 | va_end(p);
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| 148 | xfunc_die();
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| 149 | }
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| 150 |
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| 151 | void FAST_FUNC bb_error_msg(const char *s, ...)
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| 152 | {
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| 153 | va_list p;
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| 154 |
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| 155 | va_start(p, s);
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| 156 | bb_verror_msg(s, p, NULL);
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| 157 | va_end(p);
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| 158 | }
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