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/* SPDX-License-Identifier: GPL-2.0 */
/** \file http_recv.c paraslash's http receiver */
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <netdb.h>
#include <lopsub.h>
#include "recv_cmd.lsg.h"
#include "para.h"
#include "error.h"
#include "http.h"
#include "list.h"
#include "sched.h"
#include "buffer_tree.h"
#include "recv.h"
#include "net.h"
#include "string.h"
#include "fd.h"
/**
* the possible states of a http receiver node
*
* \sa \ref receiver_node.
*/
enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
/**
* Data specific to the http receiver.
*
* Each running instance of the http receiver reserves space for one such struct.
*/
struct private_http_recv_data {
/**
* The current status of the http receiver node.
*
* It gets initialized to \p HTTP_CONNECTED by the open function of the
* http receiver.
*
* \sa \ref receiver::open, \ref receiver_node.
*/
enum http_recv_status status;
};
static char *make_request_msg(void)
{
return make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
HTTP_GET_MSG, para_hostname(), paraslash_version());
}
static void http_recv_pre_monitor(struct sched *s, void *context)
{
struct receiver_node *rn = context;
struct private_http_recv_data *phd = rn->private_data;
if (generic_recv_pre_monitor(s, rn) <= 0)
return;
if (phd->status == HTTP_CONNECTED)
sched_monitor_writefd(rn->fd, s);
else
sched_monitor_readfd(rn->fd, s);
}
/*
* Establish the http connection. If already established, fill the buffer pool
* area with data read from the socket. In any case, update the state of the
* connection if necessary.
*/
static int http_recv_post_monitor(struct sched *s, void *context)
{
struct receiver_node *rn = context;
struct private_http_recv_data *phd = rn->private_data;
struct btr_node *btrn = rn->btrn;
int ret, iovcnt;
struct iovec iov[2];
size_t num_bytes;
ret = task_get_notification(rn->task);
if (ret < 0)
goto out;
ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
if (ret < 0)
goto out;
if (ret == 0)
return 0;
if (phd->status == HTTP_CONNECTED) {
char *rq;
if (!sched_write_ok(rn->fd, s))
return 0;
rq = make_request_msg();
PARA_INFO_LOG("sending http request\n");
ret = write_va_buffer(rn->fd, "%s", rq);
free(rq);
if (ret < 0)
goto out;
phd->status = HTTP_SENT_GET_REQUEST;
return 0;
}
if (phd->status == HTTP_SENT_GET_REQUEST) {
ret = read_and_compare(rn->fd, HTTP_OK_MSG);
if (ret < 0) {
PARA_ERROR_LOG("did not receive HTTP OK message\n");
goto out;
}
if (ret == 0)
return 0;
PARA_INFO_LOG("received ok msg, streaming\n");
phd->status = HTTP_STREAMING;
return 0;
}
ret = -E_HTTP_RECV_OVERRUN;
iovcnt = btr_pool_get_buffers(rn->btrp, iov);
if (iovcnt == 0)
goto out;
ret = readv_nonblock(rn->fd, iov, iovcnt, &num_bytes);
if (num_bytes == 0)
goto out;
if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
btr_add_output_pool(rn->btrp, num_bytes, btrn);
else { /* both buffers contain data */
btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
}
out:
if (ret < 0) {
PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
btr_remove_node(&rn->btrn);
}
return ret;
}
static void http_recv_close(struct receiver_node *rn)
{
close(rn->fd);
btr_pool_free(rn->btrp);
free(rn->private_data);
}
static int http_recv_open(struct receiver_node *rn)
{
struct private_http_recv_data *phd;
struct lls_parse_result *lpr = rn->lpr;
const char *r_i = RECV_CMD_OPT_STRING_VAL(HTTP, HOST, lpr);
uint32_t r_p = RECV_CMD_OPT_UINT32_VAL(HTTP, PORT, lpr);
int fd, ret = para_connect(IPPROTO_TCP, r_i, r_p);
if (ret < 0)
return ret;
fd = ret;
ret = mark_fd_nonblocking(fd);
if (ret < 0) {
close(fd);
return ret;
}
rn->private_data = phd = zalloc(sizeof(struct private_http_recv_data));
rn->fd = fd;
phd->status = HTTP_CONNECTED;
rn->btrp = btr_pool_new("http_recv", 320 * 1024);
return 1;
}
/** \cond doxygen_ignore */
const struct receiver lsg_recv_cmd_com_http_user_data = {
.open = http_recv_open,
.close = http_recv_close,
.pre_monitor = http_recv_pre_monitor,
.post_monitor = http_recv_post_monitor,
};
/** \endcond */
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