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/*
Copyright (C) 2004, 2005 Stephen Bach
This file is part of the Viewglob package.
Viewglob is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Viewglob is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Viewglob; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "common.h"
#include "param-io.h"
#include "hardened-io.h"
#include <netinet/in.h>
#include <string.h>
/* On my busiest machine, the vgexpand output for /usr/bin, /usr/include, and
/usr/lib all at once is 85K. So 100K should be a good max for now.
Probably in the future it would be better to have a growing buffer. */
#define BUFFER_SIZE 102400
/* Order must correspond to enum parameter type. */
static gchar* params[P_COUNT] = {
"none",
"purpose",
"version",
"term-title",
"vgexpand-opts",
"status",
"pwd",
"cmd",
"mask",
"developing-mask",
"vgexpand-data",
"order",
"key",
"file",
"win-id",
"reason",
"eof", /* This one shouldn't be received as a string. */
};
gboolean get_param(int fd, enum parameter* param, gchar** value) {
g_return_val_if_fail(fd >= 0, FALSE);
g_return_val_if_fail(param != NULL, FALSE);
g_return_val_if_fail(value != NULL, FALSE);
static gchar buf[BUFFER_SIZE];
guint32 bytes;
/* Find out how many bytes we're going to need to read. */
switch (read_all(fd, &bytes, sizeof(bytes))) {
case IOR_OK:
bytes = ntohl(bytes);
break;
case IOR_EOF:
goto eof_reached;
/*break;*/
case IOR_ERROR:
g_critical("Error while reading data length: %s",
g_strerror(errno));
return FALSE;
/*break;*/
default:
g_return_val_if_reached(FALSE);
/*break;*/
}
/* Get the whole parameter/value pair. */
switch (read_all(fd, buf, bytes)) {
case IOR_OK:
break;
case IOR_EOF:
goto eof_reached;
/*break;*/
case IOR_ERROR:
g_critical("Error while reading data: %s", g_strerror(errno));
return FALSE;
/*break;*/
default:
g_return_val_if_reached(FALSE);
/*break;*/
}
/* Now parse the data. */
gchar* start;
gchar* end;
gchar* p = NULL;
gchar* v = NULL;
/* First the parameter name. */
start = buf;
end = g_strstr_len(buf, bytes, ":");
if (!end)
goto fail;
*end = '\0';
p = start;
bytes -= end - start + 1;
/* Now the value. */
start = end + 1;
end = g_strstr_len(start, bytes, "\027\027");
if (!end)
goto fail;
*end = '\0';
v = start;
bytes -= end - start + 2;
*param = string_to_param(p);
*value = v;
return TRUE;
eof_reached:
*param = P_EOF;
*value = "EOF received";
return TRUE;
fail:
g_critical("Data in incorrect format");
return FALSE;
}
gboolean put_param(int fd, enum parameter param, gchar* value) {
g_return_val_if_fail(fd >= 0, FALSE);
g_return_val_if_fail(param < P_COUNT, FALSE);
g_return_val_if_fail(value != NULL, FALSE);
gchar* string;
guint32 bytes;
gsize len;
/* Make the string. */
string = g_strconcat(param_to_string(param), ":", value, "\027\027", NULL);
len = strlen(string);
/* Make sure the length is okay, and convert to network format. */
if (len > BUFFER_SIZE) {
g_critical("String length is greater than %u", BUFFER_SIZE);
return FALSE;
}
bytes = htonl((guint32)len);
/* Use writev() to try to avoid Nagle effect */
struct iovec iov[2];
iov[0].iov_base = &bytes;
iov[0].iov_len = sizeof(bytes);
iov[1].iov_base = string;
iov[1].iov_len = len;
if (writev_all(fd, iov, 2) != IOR_OK) {
g_critical("Could not write parameter: %s", g_strerror(errno));
return FALSE;
}
return TRUE;
}
enum parameter string_to_param(gchar* string) {
g_return_val_if_fail(string != NULL, P_NONE);
enum parameter param = P_NONE;
int i;
for (i = 0; i < P_COUNT; i++) {
if (STREQ(string, params[i])) {
param = i;
break;
}
}
return param;
}
gchar* param_to_string(enum parameter param) {
g_return_val_if_fail(param < P_COUNT, params[P_NONE]);
return params[param];
}
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