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/*
* General utility functions for udp tunnel
*/
/*
* Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
* Copyright 1999,2003
* Chancellor Masters and Scholars of the University of Cambridge
* Copyright 2010 Tony Finch <fanf@dotat.at>
*
* This 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 userv-utils; if not, see http://www.gnu.org/licenses/.
*/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include "forwarder.h"
const char *const *argv;
char programid[SYS_NMLN+sizeof(PROGRAM)+3];
void arg_assert_fail(const char *msg) {
fprintf(stderr, PROGRAM ": argument error (!`%s')\n",msg);
exit(12);
}
void sysfail(const char *msg) {
fprintf(stderr, "%s: fatal system error: %s: %s\n", programid, msg, strerror(errno));
exit(8);
}
void fail(const char *msg) {
fprintf(stderr, "%s: fatal error: %s\n", programid, msg);
exit(4);
}
void sysdiag(const char *msg) {
fprintf(stderr, "%s: system/network error: %s: %s\n", programid, msg, strerror(errno));
}
void diag(const char *msg) {
fprintf(stderr, "%s: %s\n", programid, msg);
}
time_t now(void) {
time_t r;
if (time(&r) == (time_t)-1) sysfail("get time of day");
return r;
}
void *xmalloc(size_t sz) {
void *r;
r= malloc(sz);
if (!r) sysfail("allocate memory");
return r;
}
void write_must(int fd, const void *p_in, int sz, const char *what) {
const unsigned char *p= p_in;
int r;
while (sz) {
r= write(fd,p,sz);
if (r<0) {
if (errno == EINTR) continue;
else sysfail(what);
}
assert(r && r <= sz);
p += r;
sz -= r;
}
}
void read_must(int fd, void *p_in, int sz, const char *what) {
unsigned char *p= p_in;
int r;
while (sz) {
r= read(fd,p,sz);
if (r<0) {
if (errno == EINTR) continue;
else sysfail(what);
}
if (r==0) fail(what);
assert(r <= sz);
p += r;
sz -= r;
}
}
const char *getarg_string(void) {
const char *arg;
arg= *++argv;
arg_assert(arg);
return arg;
}
unsigned long getarg_ulong(void) {
char *ep;
unsigned long ul;
ul= strtoul(getarg_string(),&ep,0);
arg_assert(!*ep);
return ul;
}
void *buf_append(struct buffer *buf, size_t amount) {
void *p;
p= buf->start + buf->size;
buf->size += amount;
return p;
}
void *buf_prepend(struct buffer *buf, size_t amount) {
buf->size += amount;
return buf->start -= amount;
}
void *buf_unappend(struct buffer *buf, size_t amount) {
if (buf->size < amount) return 0;
return buf->start + (buf->size -= amount);
}
void *buf_unprepend(struct buffer *buf, size_t amount) {
void *p;
p= buf->start;
buf->start += amount;
buf->size -= amount;
return p;
}
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