sync_pipe_write.c

   1 /* sync_pipe_write.c
   2  *
   3  * Wireshark - Network traffic analyzer
   4  * By Gerald Combs <gerald@wireshark.org>
   5  * Copyright 1998 Gerald Combs
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #include <config.h>
  11
  12 #include <string.h>
  13
  14 #include <glib.h>
  15
  16 #include <wsutil/file_util.h>
  17 #include <wsutil/ws_assert.h>
  18
  19 #include "sync_pipe.h"
  20
  21 /****************************************************************************************************************/
  22 /* sync_pipe handling */
  23
  24
  25 /* write a single message header to the recipient pipe */
  26 static ssize_t
  27 sync_pipe_write_header(int pipe_fd, char indicator, unsigned int length)
  28 {
  29     guchar header[1+3]; /* indicator + 3-byte len */
  30
  31     ws_assert(length <= SP_MAX_MSG_LEN);
  32
  33     /* write header (indicator + 3-byte len) */
  34     header[0] = indicator;
  35     header[1] = (length >> 16) & 0xFF;
  36     header[2] = (length >> 8) & 0xFF;
  37     header[3] = (length >> 0) & 0xFF;
  38
  39     /* write header */
  40     return ws_write(pipe_fd, header, sizeof header);
  41 }
  42
  43
  44 /* Write a message, with a string body, to the recipient pipe in the
  45    standard format (1-byte message indicator, 3-byte message length
  46    (excluding length and indicator field), and the string.
  47    If msg is NULL, the message has only a length and indicator. */
  48 void
  49 sync_pipe_write_string_msg(int pipe_fd, char indicator, const char *msg)
  50 {
  51     ssize_t ret;
  52     int len;
  53
  54     /*ws_warning("write %d enter", pipe_fd);*/
  55
  56     if(msg != NULL) {
  57         len = (int) strlen(msg) + 1;    /* including the terminating '\0'! */
  58     } else {
  59         len = 0;
  60     }
  61
  62     /* write header (indicator + 3-byte len) */
  63     ret = sync_pipe_write_header(pipe_fd, indicator, len);
  64     if(ret == -1) {
  65         return;
  66     }
  67
  68     /* write value (if we have one) */
  69     if(len) {
  70         /*ws_warning("write %d indicator: %c value len: %u msg: %s", pipe_fd, indicator, len, msg);*/
  71         ret = ws_write(pipe_fd, msg, len);
  72         if(ret == -1) {
  73             return;
  74         }
  75     } else {
  76         /*ws_warning("write %d indicator: %c no value", pipe_fd, indicator);*/
  77     }
  78
  79     /*ws_warning("write %d leave", pipe_fd);*/
  80 }
  81
  82
  83 /* Size of buffer to hold decimal representation of
  84    signed/unsigned 64-bit int */
  85 #define SP_DECISIZE 20
  86
  87 /* Write a message, with an unsigned integer body, to the recipient
  88    pipe in the standard format (1-byte message indicator, 3-byte
  89    message length (excluding length and indicator field), and the
  90    unsigned integer, as a string. */
  91 void
  92 sync_pipe_write_uint_msg(int pipe_fd, char indicator, unsigned int num)
  93 {
  94     char count_str[SP_DECISIZE+1+1];
  95
  96     snprintf(count_str, sizeof(count_str), "%u", num);
  97     sync_pipe_write_string_msg(pipe_fd, indicator, count_str);
  98 }
  99
 100 /* Write a message, with an integer body, to the recipient pipe in the
 101    standard format (1-byte message indicator, 3-byte message length
 102    (excluding length and indicator field), and the unsigned integer,
 103    as a string. */
 104 void
 105 sync_pipe_write_int_msg(int pipe_fd, char indicator, int num)
 106 {
 107     char count_str[SP_DECISIZE+1+1];
 108
 109     snprintf(count_str, sizeof(count_str), "%d", num);
 110     sync_pipe_write_string_msg(pipe_fd, indicator, count_str);
 111 }
 112
 113 /* Write a message, with a primary and secondary error message as the body,
 114    to the recipient pipe.  The header is an SP_ERROR_MSG header, with the
 115    length being the length of two string submessages; the submessages
 116    are the body of the message, with each submessage being a message
 117    with an indicator of SP_ERROR_MSG, the first message having the
 118    primary error message string and the second message having the secondary
 119    error message string. */
 120 void
 121 sync_pipe_write_errmsgs_to_parent(int pipe_fd, const char *error_msg,
 122                                   const char *secondary_error_msg)
 123 {
 124     sync_pipe_write_header(pipe_fd, SP_ERROR_MSG,
 125                            (unsigned int) (strlen(error_msg) + 1 + 4 + strlen(secondary_error_msg) + 1 + 4));
 126     sync_pipe_write_string_msg(pipe_fd, SP_ERROR_MSG, error_msg);
 127     sync_pipe_write_string_msg(pipe_fd, SP_ERROR_MSG, secondary_error_msg);
 128 }
 129
 130 /*
 131  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 132  *
 133  * Local variables:
 134  * c-basic-offset: 4
 135  * tab-width: 8
 136  * indent-tabs-mode: nil
 137  * End:
 138  *
 139  * vi: set shiftwidth=4 tabstop=8 expandtab:
 140  * :indentSize=4:tabSize=8:noTabs=true:
 141  */