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/* $OpenBSD: util.c,v 1.2 2020/01/17 20:45:50 bluhm Exp $ */
/*
* Copyright (c) 2020 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
void
task_enqueue(struct task *todo, int ch, const char *msg)
{
switch (ch) {
case 'E':
todo->t_type = TEOF;
todo->t_msg = NULL;
break;
case 'N':
todo->t_type = TDWN;
todo->t_msg = NULL;
break;
case 'r':
todo->t_type = TRCV;
todo->t_msg = msg;
break;
case 's':
todo->t_type = TSND;
todo->t_msg = msg;
break;
}
}
void
task_run(int s, struct task *todolist, size_t tlen)
{
size_t t;
for (t = 0; t < tlen; t++) {
switch(todolist[t].t_type) {
case TEOF:
receive_eof(s);
break;
case TDWN:
send_shutdown(s);
break;
case TRCV:
receive_line(s, todolist[t].t_msg);
break;
case TSND:
send_line(s, todolist[t].t_msg);
break;
}
}
}
void
alarm_timeout(void)
{
/* just abort after 10 seconds */
if ((int)alarm(10) == -1)
err(1, "alarm");
}
void
print_sockname(int s)
{
struct sockaddr_storage ss;
socklen_t slen;
char host[NI_MAXHOST], port[NI_MAXSERV];
slen = sizeof(ss);
if (getsockname(s, (struct sockaddr *)&ss, &slen) == -1)
err(1, "getsockname");
if (getnameinfo((struct sockaddr *)&ss, ss.ss_len, host, sizeof(host),
port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV))
errx(1, "getnameinfo");
printf("%s\n", port);
if (fflush(stdout) != 0)
err(1, "fflush stdout");
fprintf(stderr, "sock: %s %s\n", host, port);
}
void
print_peername(int s)
{
struct sockaddr_storage ss;
socklen_t slen;
char host[NI_MAXHOST], port[NI_MAXSERV];
slen = sizeof(ss);
if (getpeername(s, (struct sockaddr *)&ss, &slen) == -1)
err(1, "getpeername");
if (getnameinfo((struct sockaddr *)&ss, ss.ss_len, host, sizeof(host),
port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV))
errx(1, "getnameinfo");
fprintf(stderr, "peer: %s %s\n", host, port);
}
void
receive_eof(int s)
{
char buf[100];
size_t len;
ssize_t n;
n = recv(s, buf, sizeof(buf) - 1, 0);
if (n == -1)
err(1, "recv");
if (n == 0) {
fprintf(stderr, "<<< EOF\n");
return;
}
len = n;
buf[len] = '\0';
if (buf[len - 1] == '\n')
buf[--len] = '\0';
fprintf(stderr, "<<< %s\n", buf);
errx(1, "expected receive EOF, got '%s'", buf);
}
void
send_shutdown(int s)
{
if (shutdown(s, SHUT_WR) == -1)
err(1, "shutdown");
}
void
receive_line(int s, const char *msg)
{
char buf[100];
size_t off, len;
ssize_t n;
len = 0;
while (len < sizeof(buf) - 1) {
off = len;
n = recv(s, buf + off, sizeof(buf) - 1 - off, 0);
if (n == -1)
err(1, "recv");
if (n == 0) {
fprintf(stderr, "<<< EOF\n");
break;
}
len += n;
buf[len] = '\0';
if (buf[len - 1] == '\n')
fprintf(stderr, "<<< %s", buf + off);
else
fprintf(stderr, "<<< %s\n", buf + off);
if (strchr(buf + off, '\n') != NULL)
break;
}
if (len == 0)
errx(1, "empty receive buffer");
if (buf[len - 1] != '\n')
errx(1, "new line missing in receive buffer");
buf[--len] = '\0';
if (strcmp(msg, buf) != 0)
errx(1, "expected receive '%s', got '%s'", msg, buf);
}
void
send_line(int s, const char *msg)
{
char buf[100];
size_t off, len;
ssize_t n;
len = strlcpy(buf, msg, sizeof(buf));
if (len >= sizeof(buf))
errx(1, "message too long for send buffer");
if (buf[len] != '\n') {
buf[len++] = '\n';
if (len >= sizeof(buf))
errx(1, "new line too long for send buffer");
buf[len] = 0;
}
off = 0;
while (off < len) {
fprintf(stderr, ">>> %s", buf + off);
n = send(s, buf + off, len - off, 0);
if (n == -1)
err(1, "send");
off += n;
}
}
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