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 tarball for details.
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8 | */
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9 |
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10 | #include <syslog.h>
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11 | #include "libbb.h"
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12 |
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13 | smallint logmode = LOGMODE_STDIO;
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14 | const char *msg_eol = "\n";
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15 |
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16 | void bb_verror_msg(const char *s, va_list p, const char* strerr)
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17 | {
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18 | char *msg;
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19 | int applet_len, strerr_len, msgeol_len, used;
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20 |
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21 | if (!logmode)
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22 | return;
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23 |
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24 | if (!s) /* nomsg[_and_die] uses NULL fmt */
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25 | s = ""; /* some libc don't like printf(NULL) */
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26 |
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27 | used = vasprintf(&msg, s, p);
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28 | if (used < 0)
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29 | return;
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30 |
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31 | /* This is ugly and costs +60 bytes compared to multiple
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32 | * fprintf's, but is guaranteed to do a single write.
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33 | * This is needed for e.g. httpd logging, when multiple
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34 | * children can produce log messages simultaneously. */
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35 |
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36 | applet_len = strlen(applet_name) + 2; /* "applet: " */
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37 | strerr_len = strerr ? strlen(strerr) : 0;
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38 | msgeol_len = strlen(msg_eol);
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39 | /* +3 is for ": " before strerr and for terminating NUL */
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40 | msg = xrealloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
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41 | /* TODO: maybe use writev instead of memmoving? Need full_writev? */
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42 | memmove(msg + applet_len, msg, used);
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43 | used += applet_len;
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44 | strcpy(msg, applet_name);
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45 | msg[applet_len - 2] = ':';
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46 | msg[applet_len - 1] = ' ';
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47 | if (strerr) {
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48 | msg[used++] = ':';
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49 | msg[used++] = ' ';
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50 | strcpy(&msg[used], strerr);
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51 | used += strerr_len;
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52 | }
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53 | strcpy(&msg[used], msg_eol);
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54 |
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55 | if (logmode & LOGMODE_STDIO) {
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56 | fflush(stdout);
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57 | full_write(2, msg, used + msgeol_len);
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58 | }
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59 | if (logmode & LOGMODE_SYSLOG) {
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60 | syslog(LOG_ERR, "%s", msg + applet_len);
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61 | }
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62 | free(msg);
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63 | }
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64 |
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65 |
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66 | #ifdef VERSION_WITH_WRITEV
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67 |
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68 | /* Code size is approximately the same, but currently it's the only user
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69 | * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
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70 |
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71 | void bb_verror_msg(const char *s, va_list p, const char* strerr)
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72 | {
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73 | int strerr_len, msgeol_len;
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74 | struct iovec iov[3];
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75 |
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76 | #define used (iov[2].iov_len)
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77 | #define msgv (iov[2].iov_base)
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78 | #define msgc ((char*)(iov[2].iov_base))
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79 | #define msgptr (&(iov[2].iov_base))
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80 |
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81 | if (!logmode)
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82 | return;
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83 |
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84 | if (!s) /* nomsg[_and_die] uses NULL fmt */
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85 | s = ""; /* some libc don't like printf(NULL) */
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86 |
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87 | /* Prevent "derefing type-punned ptr will break aliasing rules" */
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88 | used = vasprintf((char**)(void*)msgptr, s, p);
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89 | if (used < 0)
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90 | return;
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91 |
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92 | /* This is ugly and costs +60 bytes compared to multiple
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93 | * fprintf's, but is guaranteed to do a single write.
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94 | * This is needed for e.g. httpd logging, when multiple
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95 | * children can produce log messages simultaneously. */
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96 |
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97 | strerr_len = strerr ? strlen(strerr) : 0;
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98 | msgeol_len = strlen(msg_eol);
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99 | /* +3 is for ": " before strerr and for terminating NUL */
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100 | msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
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101 | if (strerr) {
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102 | msgc[used++] = ':';
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103 | msgc[used++] = ' ';
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104 | strcpy(msgc + used, strerr);
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105 | used += strerr_len;
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106 | }
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107 | strcpy(msgc + used, msg_eol);
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108 | used += msgeol_len;
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109 |
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110 | if (logmode & LOGMODE_STDIO) {
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111 | iov[0].iov_base = (char*)applet_name;
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112 | iov[0].iov_len = strlen(applet_name);
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113 | iov[1].iov_base = (char*)": ";
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114 | iov[1].iov_len = 2;
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115 | /*iov[2].iov_base = msgc;*/
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116 | /*iov[2].iov_len = used;*/
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117 | fflush(stdout);
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118 | writev(2, iov, 3);
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119 | }
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120 | if (logmode & LOGMODE_SYSLOG) {
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121 | syslog(LOG_ERR, "%s", msgc);
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122 | }
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123 | free(msgc);
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124 | }
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125 | #endif
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