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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright © 2020 rsiddharth <s@ricketyspace.net>
*/
#include <nserve.h>
int slurpsock(char *buf, size_t buf_sz, int sock)
{
ssize_t bytes;
bytes = recv(sock, buf, buf_sz, 0);
check(bytes >= 0, "Failed to read from socket: %d", sock);
return bytes;
error:
return -1;
}
int barfsock(char *buf, size_t buf_sz, int sock)
{
ssize_t bytes = 0;
bytes = send(sock, buf, buf_sz, 0);
check(bytes >= 0, "barfsock: send failed");
return bytes;
error:
return -1;
}
int set_recv_timeout(int sock) {
struct timeval tv;
tv.tv_sec = 30;
tv.tv_usec = 0;
int rc = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
&tv, sizeof(tv));
check(rc == 0, "setsockopt failed");
return 0;
error:
return -1;
}
void nserve(int sock)
{
char *out = NULL, *cmd = NULL;
int rc = 0;
check(sock > 0, "invalid socket");
rc = set_recv_timeout(sock);
check(rc == 0, "setting recv timeout failed");
out = (char *) calloc(RSP_SIZE + 1, sizeof(char));
check_mem(out);
cmd = (char *) calloc(CMD_MAX_SIZE + 1, sizeof(char));
check_mem(cmd);
do {
// clear out, cmd.
memset(out, '\0', RSP_SIZE + 1);
memset(cmd, '\0', CMD_MAX_SIZE + 1);
// Read command from socket.
ssize_t bytes = slurpsock(cmd, CMD_MAX_SIZE, sock);
check(bytes >= 0, "nserve: slurpsock failed");
rc = process(cmd, out);
if (rc < 0) {
break;
}
// Write response to socket.
rc = barfsock(out, strlen(out), sock);
check(rc != -1, "nserve: echo failed");
} while(1);
// fallthrough.
error:
strncpy(out, "closing connection\n", RSP_SIZE);
barfsock(out, strlen(out), sock);
close(sock);
// Cleanup if needed.
if (cmd)
free(cmd);
if (out)
free(out);
exit(0);
}
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