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hio/lib/http-fcgi.c

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#include "http-prv.h"
#include <hio-fmt.h>
#include <hio-chr.h>
#include <hio-fcgi.h>
#include <unistd.h>
#define FCGI_ALLOW_UNLIMITED_REQ_CONTENT_LENGTH
enum fcgi_res_mode_t
{
FCGI_RES_MODE_CHUNKED,
FCGI_RES_MODE_CLOSE,
FCGI_RES_MODE_LENGTH
};
typedef enum fcgi_res_mode_t fcgi_res_mode_t;
#define FCGI_PENDING_IO_THRESHOLD_TO_CLIENT 50
#define FCGI_PENDING_IO_THRESHOLD_TO_PEER 50
#define FCGI_OVER_READ_FROM_CLIENT (1 << 0)
#define FCGI_OVER_READ_FROM_PEER (1 << 1)
#define FCGI_OVER_WRITE_TO_CLIENT (1 << 2)
#define FCGI_OVER_WRITE_TO_PEER (1 << 3)
#define FCGI_OVER_ALL (FCGI_OVER_READ_FROM_CLIENT | FCGI_OVER_READ_FROM_PEER | FCGI_OVER_WRITE_TO_CLIENT | FCGI_OVER_WRITE_TO_PEER)
struct fcgi_t
{
HIO_SVC_HTTS_TASK_HEADER;
hio_svc_htts_task_on_kill_t on_kill; /* user-provided on_kill callback */
hio_oow_t num_pending_writes_to_client;
hio_oow_t num_pending_writes_to_peer;
hio_svc_fcgic_sess_t* peer;
hio_htrd_t* peer_htrd;
hio_dev_sck_t* csck;
unsigned int over: 4; /* must be large enough to accomodate FCGI_OVER_ALL */
unsigned int keep_alive: 1;
unsigned int req_content_length_unlimited: 1;
unsigned int ever_attempted_to_write_to_client: 1;
unsigned int last_chunk_sent: 1;
unsigned int client_disconnected: 1;
unsigned int client_eof_detected: 1;
unsigned int client_htrd_recbs_changed: 1;
hio_oow_t req_content_length; /* client request content length */
fcgi_res_mode_t res_mode_to_cli;
hio_dev_sck_on_read_t client_org_on_read;
hio_dev_sck_on_write_t client_org_on_write;
hio_dev_sck_on_disconnect_t client_org_on_disconnect;
hio_htrd_recbs_t client_htrd_org_recbs;
};
typedef struct fcgi_t fcgi_t;
struct fcgi_peer_xtn_t
{
fcgi_t* fcgi; /* back pointer to the fcgi object */
};
typedef struct fcgi_peer_xtn_t fcgi_peer_xtn_t;
static void unbind_task_from_client (fcgi_t* fcgi, int rcdown);
static void unbind_task_from_peer (fcgi_t* fcgi, int rcdown);
static void fcgi_halt_participating_devices (fcgi_t* fcgi)
{
/* TODO: include fcgi session id in the output in place of peer??? */
HIO_DEBUG5 (fcgi->htts->hio, "HTTS(%p) - fcgi(t=%p,c=%p(%d),p=%p) Halting participating devices\n", fcgi->htts, fcgi, fcgi->csck, (fcgi->csck? fcgi->csck->hnd: -1), fcgi->peer);
if (fcgi->csck) hio_dev_sck_halt (fcgi->csck);
unbind_task_from_peer (fcgi, 1);
}
static int fcgi_write_to_client (fcgi_t* fcgi, const void* data, hio_iolen_t dlen)
{
if (fcgi->csck)
{
fcgi->ever_attempted_to_write_to_client = 1;
HIO_DEBUG2 (fcgi->htts->hio, "WR TO C[%.*hs]\n", dlen, data);
fcgi->num_pending_writes_to_client++;
if (hio_dev_sck_write(fcgi->csck, data, dlen, HIO_NULL, HIO_NULL) <= -1)
{
fcgi->num_pending_writes_to_client--;
return -1;
}
#if 0
if (fcgi->num_pending_writes_to_client > FCGI_PENDING_IO_THRESHOLD_TO_CLIENT)
{
/* the fcgic service is shared. whent the client side is stuck,
* it's not natural to stop reading from the whole service. */
/* if (hio_svc_fcgic_read(fcgi->peer, 0) <= -1) return -1; */
/* do nothing for now. TODO: but should the slow client connection be aborted??? */
}
#endif
}
return 0;
}
static int fcgi_writev_to_client (fcgi_t* fcgi, hio_iovec_t* iov, hio_iolen_t iovcnt)
{
if (fcgi->csck)
{
fcgi->ever_attempted_to_write_to_client = 1;
fcgi->num_pending_writes_to_client++;
if (hio_dev_sck_writev(fcgi->csck, iov, iovcnt, HIO_NULL, HIO_NULL) <= -1)
{
fcgi->num_pending_writes_to_client--;
return -1;
}
#if 0
if (fcgi->num_pending_writes_to_client > FCGI_PENDING_IO_THRESHOLD_TO_CLIENT)
{
/* the fcgic service is shared. whent the client side is stuck,
* it's not natural to stop reading from the whole service. */
/* if (hio_svc_fcgic_read(fcgi->peer, 0) <= -1) return -1; */
/* do nothing for now. TODO: but should the slow client connection be aborted??? */
}
#endif
}
return 0;
}
static int fcgi_send_final_status_to_client (fcgi_t* fcgi, int status_code, int force_close)
{
hio_svc_htts_cli_t* cli = fcgi->task_client;
hio_bch_t dtbuf[64];
const hio_bch_t* status_msg;
hio_oow_t content_len;
if (!cli) return 0; /* client unbound or no binding client */
hio_svc_htts_fmtgmtime (cli->htts, HIO_NULL, dtbuf, HIO_COUNTOF(dtbuf));
status_msg = hio_http_status_to_bcstr(status_code);
content_len = hio_count_bcstr(status_msg);
if (!force_close) force_close = !fcgi->keep_alive;
if (hio_becs_fmt(cli->sbuf, "HTTP/%d.%d %d %hs\r\nServer: %hs\r\nDate: %hs\r\nConnection: %hs\r\n",
fcgi->task_req_version.major, fcgi->task_req_version.minor,
status_code, status_msg,
cli->htts->server_name, dtbuf,
(force_close? "close": "keep-alive")) == (hio_oow_t)-1) return -1;
if (fcgi->task_req_method == HIO_HTTP_HEAD)
{
if (status_code != HIO_HTTP_STATUS_OK) content_len = 0;
status_msg = "";
}
if (hio_becs_fcat(cli->sbuf, "Content-Type: text/plain\r\nContent-Length: %zu\r\n\r\n%hs", content_len, status_msg) == (hio_oow_t)-1) return -1;
fcgi->task_status_code = status_code;
return (fcgi_write_to_client(fcgi, HIO_BECS_PTR(cli->sbuf), HIO_BECS_LEN(cli->sbuf)) <= -1 ||
(force_close && fcgi_write_to_client(fcgi, HIO_NULL, 0) <= -1))? -1: 0;
}
static int fcgi_write_last_chunk_to_client (fcgi_t* fcgi)
{
if (!fcgi->last_chunk_sent)
{
fcgi->last_chunk_sent = 1;
if (!fcgi->ever_attempted_to_write_to_client)
{
if (fcgi_send_final_status_to_client(fcgi, HIO_HTTP_STATUS_INTERNAL_SERVER_ERROR, 0) <= -1) return -1;
}
else
{
if (fcgi->res_mode_to_cli == FCGI_RES_MODE_CHUNKED &&
fcgi_write_to_client(fcgi, "0\r\n\r\n", 5) <= -1) return -1;
}
if (!fcgi->keep_alive && fcgi_write_to_client(fcgi, HIO_NULL, 0) <= -1) return -1;
}
return 0;
}
static int fcgi_write_stdin_to_peer (fcgi_t* fcgi, const void* data, hio_iolen_t dlen)
{
if (fcgi->peer)
{
fcgi->num_pending_writes_to_peer++;
if (hio_svc_fcgic_writestdin(fcgi->peer, data, dlen) <= -1) /* TODO: write STDIN, PARAM? */
{
fcgi->num_pending_writes_to_peer--;
return -1;
}
#if 0
/* TODO: check if it's already finished or something.. */
if (fcgi->num_pending_writes_to_peer > FCGI_PENDING_IO_THRESHOLD_TO_PEER)
{
/* disable input watching */
if (hio_dev_sck_read(fcgi->csck, 0) <= -1) return -1;
}
#endif
}
return 0;
}
static HIO_INLINE void fcgi_mark_over (fcgi_t* fcgi, int over_bits)
{
hio_svc_htts_t* htts = fcgi->htts;
hio_t* hio = htts->hio;
unsigned int old_over;
old_over = fcgi->over;
fcgi->over |= over_bits;
HIO_DEBUG8 (hio, "HTTS(%p) - fcgi(t=%p,c=%p[%d],p=%p) - old_over=%x | new-bits=%x => over=%x\n", fcgi->htts, fcgi, fcgi->task_client, (fcgi->csck? fcgi->csck->hnd: -1), fcgi->peer, (int)old_over, (int)over_bits, (int)fcgi->over);
if (!(old_over & FCGI_OVER_READ_FROM_CLIENT) && (fcgi->over & FCGI_OVER_READ_FROM_CLIENT))
{
/* finished reading from the client. stop watching read */
if (fcgi->csck && hio_dev_sck_read(fcgi->csck, 0) <= -1)
{
HIO_DEBUG2 (fcgi->htts->hio, "HTTS(%p) - halting client(%p) for failure to disable input watching\n", fcgi->htts, fcgi->csck);
hio_dev_sck_halt (fcgi->csck);
}
}
if (!(old_over & FCGI_OVER_READ_FROM_PEER) && (fcgi->over & FCGI_OVER_READ_FROM_PEER))
{
if (fcgi->peer)
{
hio_svc_fcgic_untie (fcgi->peer); /* the untie callback will reset fcgi->peer to HIO_NULL */
HIO_SVC_HTTS_TASK_RCDOWN((hio_svc_htts_task_t*)fcgi); /* ref down from fcgi->peer->ctx. unable to use UNREF() */
}
}
if (old_over != FCGI_OVER_ALL && fcgi->over == FCGI_OVER_ALL)
{
/* ready to stop */
if (fcgi->peer)
{
hio_svc_fcgic_untie (fcgi->peer);
HIO_SVC_HTTS_TASK_RCDOWN((hio_svc_htts_task_t*)fcgi); /* ref down from fcgi->peer->ctx. unable to use UNREF() */
}
if (fcgi->csck)
{
HIO_DEBUG2 (hio, "HTTS(%p) - ALL OVER keeping client(%p) alive\n", fcgi->htts, fcgi->csck);
if (fcgi->keep_alive && !fcgi->client_eof_detected)
{
HIO_DEBUG2 (hio, "HTTS(%p) - keeping client(%p) alive\n", fcgi->htts, fcgi->csck);
HIO_ASSERT (fcgi->htts->hio, fcgi->task_client->task == (hio_svc_htts_task_t*)fcgi);
unbind_task_from_client (fcgi, 1);
/* fcgi must not be accessed from here down as it could have been destroyed in unbind_task_from_client() */
}
else
{
HIO_DEBUG2 (hio, "HTTS(%p) - halting client(%p) for no keep-alive\n", fcgi->htts, fcgi->csck);
hio_dev_sck_shutdown (fcgi->csck, HIO_DEV_SCK_SHUTDOWN_WRITE);
hio_dev_sck_halt (fcgi->csck);
}
}
}
}
static void fcgi_on_kill (hio_svc_htts_task_t* task)
{
fcgi_t* fcgi = (fcgi_t*)task;
hio_t* hio = fcgi->htts->hio;
HIO_DEBUG5 (hio, "HTTS(%p) - fcgi(t=%p,c=%p[%d],p=%p) - killing the task\n", fcgi->htts, fcgi, fcgi->task_client, (fcgi->csck? fcgi->csck->hnd: -1), fcgi->peer);
if (fcgi->on_kill) fcgi->on_kill (task);
/* [NOTE]
* 1. if hio_svc_htts_task_kill() is called, fcgi->peer, fcgi->peer_htrd, fcgi->csck,
* fcgi->task_client may not not null.
* 2. this callback function doesn't decrement the reference count on fcgi because
* this is the fcgi destruction call-back.
*/
if (fcgi->peer) hio_svc_fcgic_untie (fcgi->peer);
if (fcgi->peer_htrd)
{
fcgi_peer_xtn_t* pxtn = hio_htrd_getxtn(fcgi->peer_htrd);
pxtn->fcgi = HIO_NULL;
hio_htrd_close (fcgi->peer_htrd);
fcgi->peer_htrd = HIO_NULL;
}
if (fcgi->csck)
{
HIO_ASSERT (hio, fcgi->task_client != HIO_NULL);
unbind_task_from_client (fcgi, 0);
}
/* detach from the htts service only if it's attached */
if (fcgi->task_next) HIO_SVC_HTTS_TASKL_UNLINK_TASK (fcgi);
HIO_DEBUG5 (hio, "HTTS(%p) - fcgi(t=%p,c=%p[%d],p=%p) - killed the task\n", fcgi->htts, fcgi, fcgi->task_client, (fcgi->csck? fcgi->csck->hnd: -1), fcgi->peer);
}
static void fcgi_peer_on_untie (hio_svc_fcgic_sess_t* peer, void* ctx)
{
fcgi_t* fcgi = (fcgi_t*)ctx;
hio_t* hio = fcgi->htts->hio;
/* in case this untie event originates from the fcgi client itself.
* fcgi_halt_participating_devices() calls hio_svc_fcgi_untie() again
* to cause an infinite loop if we don't reset fcgi->peer to HIO_NULL here */
HIO_DEBUG5 (hio, "HTTS(%p) - fcgi(t=%p,c=%p[%d],p=%p) - peer untied\n", fcgi->htts, fcgi, fcgi->task_client, (fcgi->csck? fcgi->csck->hnd: -1), fcgi->peer);
fcgi->peer = HIO_NULL;
fcgi_write_last_chunk_to_client (fcgi);
unbind_task_from_peer (fcgi, 1);
}
static int fcgi_peer_on_read (hio_svc_fcgic_sess_t* peer, const void* data, hio_iolen_t dlen, void* ctx)
{
fcgi_t* fcgi = (fcgi_t*)ctx;
hio_svc_htts_t* htts = fcgi->htts;
hio_t* hio = htts->hio;
if (dlen <= -1)
{
HIO_DEBUG2 (hio, "HTTS(%p) - read error from peer %p\n", htts, peer);
goto oops;
}
if (dlen == 0)
{
HIO_DEBUG2 (hio, "HTTS(%p) - EOF from peer %p\n", htts, peer);
if (!(fcgi->over & FCGI_OVER_READ_FROM_PEER))
{
int n;
/* the fcgi script could be misbehaving.
* it still has to read more but EOF is read.
* otherwise peer_htrd_poke() should have been called */
n = fcgi_write_last_chunk_to_client(fcgi);
fcgi_mark_over (fcgi, FCGI_OVER_READ_FROM_PEER);
if (n <= -1) goto oops;
}
}
else
{
hio_oow_t rem;
HIO_ASSERT (hio, !(fcgi->over & FCGI_OVER_READ_FROM_PEER));
if (hio_htrd_feed(fcgi->peer_htrd, data, dlen, &rem) <= -1)
{
HIO_DEBUG2 (hio, "HTTS(%p) - unable to feed peer htrd - peer %p\n", htts, peer);
if (!fcgi->ever_attempted_to_write_to_client &&
!(fcgi->over & FCGI_OVER_WRITE_TO_CLIENT))
{
fcgi_send_final_status_to_client (fcgi, HIO_HTTP_STATUS_INTERNAL_SERVER_ERROR, 1); /* don't care about error because it jumps to oops below anyway */
}
goto oops;
}
if (rem > 0)
{
/* If the script specifies Content-Length and produces longer data, it will come here */
/* ezcessive data ... */
/* TODO: or drop this request?? */
}
}
return 0;
oops:
fcgi_halt_participating_devices (fcgi); /* TODO: kill the session only??? */
return 0;
}
static int fcgi_peer_on_write (hio_svc_fcgic_sess_t* peer, hio_fcgi_req_type_t rqtype, hio_iolen_t wrlen, void* wrctx)
{
fcgi_t* fcgi = (fcgi_t*)wrctx;
if (wrlen <= -1) goto oops;
if (rqtype == HIO_FCGI_STDIN && wrlen == 0)
{
/* completely wrote end of stdin to the cgi server */
fcgi_mark_over (fcgi, FCGI_OVER_WRITE_TO_PEER);
}
return 0;
oops:
fcgi_halt_participating_devices (fcgi);
return 0;
}
static int peer_capture_response_header (hio_htre_t* req, const hio_bch_t* key, const hio_htre_hdrval_t* val, void* ctx)
{
hio_svc_htts_cli_t* cli = (hio_svc_htts_cli_t*)ctx;
/* capture a header except Status, Connection, Transfer-Encoding, and Server */
if (hio_comp_bcstr(key, "Status", 1) != 0 &&
hio_comp_bcstr(key, "Connection", 1) != 0 &&
hio_comp_bcstr(key, "Transfer-Encoding", 1) != 0 &&
hio_comp_bcstr(key, "Server", 1) != 0 &&
hio_comp_bcstr(key, "Date", 1) != 0)
{
do
{
if (hio_becs_cat(cli->sbuf, key) == (hio_oow_t)-1 ||
hio_becs_cat(cli->sbuf, ": ") == (hio_oow_t)-1 ||
hio_becs_cat(cli->sbuf, val->ptr) == (hio_oow_t)-1 ||
hio_becs_cat(cli->sbuf, "\r\n") == (hio_oow_t)-1)
{
return -1;
}
val = val->next;
}
while (val);
}
return 0;
}
static int peer_htrd_peek (hio_htrd_t* htrd, hio_htre_t* req)
{
fcgi_peer_xtn_t* peer = hio_htrd_getxtn(htrd);
fcgi_t* fcgi = peer->fcgi;
hio_svc_htts_cli_t* cli = fcgi->task_client;
hio_bch_t dtbuf[64];
int status_code = HIO_HTTP_STATUS_OK;
const hio_bch_t* status_desc = HIO_NULL;
if (req->attr.content_length)
{
// TOOD: remove content_length if content_length is negative or not numeric.
fcgi->res_mode_to_cli = FCGI_RES_MODE_LENGTH;
}
if (req->attr.status) hio_parse_http_status_header_value(req->attr.status, &status_code, &status_desc);
hio_svc_htts_fmtgmtime (cli->htts, HIO_NULL, dtbuf, HIO_COUNTOF(dtbuf));
if (hio_becs_fmt(cli->sbuf, "HTTP/%d.%d ", fcgi->task_req_version.major, fcgi->task_req_version.minor) == (hio_oow_t)-1) return -1;
if (hio_becs_fcat(cli->sbuf, "%d %hs\r\n", status_code, (status_desc? status_desc: hio_http_status_to_bcstr(status_code))) == (hio_oow_t)-1) return -1;
if (hio_becs_fcat(cli->sbuf, "Server: %hs\r\nDate: %hs\r\n", cli->htts->server_name, dtbuf) == (hio_oow_t)-1) return -1;
if (hio_htre_walkheaders(req, peer_capture_response_header, cli) <= -1) return -1;
switch (fcgi->res_mode_to_cli)
{
case FCGI_RES_MODE_CHUNKED:
if (hio_becs_cat(cli->sbuf, "Transfer-Encoding: chunked\r\n") == (hio_oow_t)-1) return -1;
/*if (hio_becs_cat(cli->sbuf, "Connection: keep-alive\r\n") == (hio_oow_t)-1) return -1;*/
break;
case FCGI_RES_MODE_CLOSE:
if (hio_becs_cat(cli->sbuf, "Connection: close\r\n") == (hio_oow_t)-1) return -1;
break;
case FCGI_RES_MODE_LENGTH:
if (hio_becs_cat(cli->sbuf, (fcgi->keep_alive? "Connection: keep-alive\r\n": "Connection: close\r\n")) == (hio_oow_t)-1) return -1;
}
if (hio_becs_cat(cli->sbuf, "\r\n") == (hio_oow_t)-1) return -1;
return fcgi_write_to_client(fcgi, HIO_BECS_PTR(cli->sbuf), HIO_BECS_LEN(cli->sbuf));
}
static int peer_htrd_poke (hio_htrd_t* htrd, hio_htre_t* req)
{
fcgi_peer_xtn_t* peer = hio_htrd_getxtn(htrd);
fcgi_t* fcgi = peer->fcgi;
if (fcgi_write_last_chunk_to_client(fcgi) <= -1) return -1;
fcgi_mark_over (fcgi, FCGI_OVER_READ_FROM_PEER);
return 0;
}
static int peer_htrd_push_content (hio_htrd_t* htrd, hio_htre_t* req, const hio_bch_t* data, hio_oow_t dlen)
{
fcgi_peer_xtn_t* peer = hio_htrd_getxtn(htrd);
fcgi_t* fcgi = peer->fcgi;
HIO_ASSERT (fcgi->htts->hio, htrd == fcgi->peer_htrd);
switch (fcgi->res_mode_to_cli)
{
case FCGI_RES_MODE_CHUNKED:
{
hio_iovec_t iov[3];
hio_bch_t lbuf[16];
hio_oow_t llen;
/* hio_fmt_uintmax_to_bcstr() null-terminates the output. only HIO_COUNTOF(lbuf) - 1
* is enough to hold '\r' and '\n' at the back without '\0'. */
llen = hio_fmt_uintmax_to_bcstr(lbuf, HIO_COUNTOF(lbuf) - 1, dlen, 16 | HIO_FMT_UINTMAX_UPPERCASE, 0, '\0', HIO_NULL);
lbuf[llen++] = '\r';
lbuf[llen++] = '\n';
iov[0].iov_ptr = lbuf;
iov[0].iov_len = llen;
iov[1].iov_ptr = (void*)data;
iov[1].iov_len = dlen;
iov[2].iov_ptr = "\r\n";
iov[2].iov_len = 2;
if (fcgi_writev_to_client(fcgi, iov, HIO_COUNTOF(iov)) <= -1) goto oops;
break;
}
case FCGI_RES_MODE_CLOSE:
case FCGI_RES_MODE_LENGTH:
if (fcgi_write_to_client(fcgi, data, dlen) <= -1) goto oops;
break;
}
#if 0
if (fcgi->num_pending_writes_to_client > FCGI_PENDING_IO_THRESHOLD_TO_CLIENT)
{
if (hio_svc_fcgic_read(fcgi->peer, 0) <= -1) goto oops;
}
#endif
return 0;
oops:
return -1;
}
static hio_htrd_recbs_t peer_htrd_recbs =
{
peer_htrd_peek,
peer_htrd_poke,
peer_htrd_push_content
};
static int fcgi_client_htrd_poke (hio_htrd_t* htrd, hio_htre_t* req)
{
/* the client request got completed including body.
* this callback is set and called only if there is content in the request */
hio_svc_htts_cli_htrd_xtn_t* htrdxtn = (hio_svc_htts_cli_htrd_xtn_t*)hio_htrd_getxtn(htrd);
hio_dev_sck_t* sck = htrdxtn->sck;
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(sck);
fcgi_t* fcgi = (fcgi_t*)cli->task;
/* indicate end of STDIN */
if (fcgi_write_stdin_to_peer(fcgi, HIO_NULL, 0) <= -1) return -1;
fcgi_mark_over (fcgi, FCGI_OVER_READ_FROM_CLIENT);
return 0;
}
static int fcgi_client_htrd_push_content (hio_htrd_t* htrd, hio_htre_t* req, const hio_bch_t* data, hio_oow_t dlen)
{
hio_svc_htts_cli_htrd_xtn_t* htrdxtn = (hio_svc_htts_cli_htrd_xtn_t*)hio_htrd_getxtn(htrd);
hio_dev_sck_t* sck = htrdxtn->sck;
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(sck);
fcgi_t* fcgi = (fcgi_t*)cli->task;
HIO_ASSERT (sck->hio, cli->sck == sck);
/* write the contents to fcgi server as stdin*/
return fcgi_write_stdin_to_peer(fcgi, data, dlen);
}
static hio_htrd_recbs_t fcgi_client_htrd_recbs =
{
HIO_NULL, /* this shall be set to an actual peer handler before hio_htrd_setrecbs() */
fcgi_client_htrd_poke,
fcgi_client_htrd_push_content
};
static void fcgi_client_on_disconnect (hio_dev_sck_t* sck)
{
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(sck);
hio_t* hio = sck->hio;
hio_svc_htts_t* htts = cli->htts;
fcgi_t* fcgi = (fcgi_t*)cli->task;
HIO_DEBUG4 (hio, "HTTS(%p) - fcgi(t=%p,c=%p,csck=%p) - client socket disconnect handled\n", htts, fcgi, cli, sck);
/* fcgi may be null if there is no associated task or
* the previously associated one is already gone */
if (fcgi)
{
HIO_ASSERT (hio, sck == fcgi->csck);
/* set fcgi->client_disconnect to 1 before unbind_task_from_client()
* because fcgi can be destroyed if its reference count hits 0 */
fcgi->client_disconnected = 1;
unbind_task_from_client (fcgi, 1);
/* this is the original callback restored in unbind_task_from_client() */
if (sck->on_disconnect) sck->on_disconnect (sck);
}
HIO_DEBUG4 (hio, "HTTS(%p) - fcgi(t=%p,c=%p,csck=%p) - client socket disconnect handled\n", htts, fcgi, cli, sck);
/* Note: after this callback, the actual device pointed to by 'sck' will be freed in the main loop. */
}
static int fcgi_client_on_read (hio_dev_sck_t* sck, const void* buf, hio_iolen_t len, const hio_skad_t* srcaddr)
{
hio_t* hio = sck->hio;
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(sck);
fcgi_t* fcgi = (fcgi_t*)cli->task;
HIO_ASSERT (hio, sck == cli->sck);
if (len <= -1)
{
/* read error */
HIO_DEBUG2 (cli->htts->hio, "HTTS(%p) - read error on client %p(%d)\n", sck, (int)sck->hnd);
goto oops;
}
if (!fcgi->peer)
{
/* the peer is gone */
goto oops; /* do what? just return 0? */
}
if (len == 0)
{
/* EOF on the client side. arrange to close */
HIO_DEBUG3 (hio, "HTTS(%p) - EOF from client %p(hnd=%d)\n", fcgi->htts, sck, (int)sck->hnd);
fcgi->client_eof_detected = 1;
if (!(fcgi->over & FCGI_OVER_READ_FROM_CLIENT)) /* if this is true, EOF is received without fcgi_client_htrd_poke() */
{
/* indicate eof to the write side */
int n;
n = fcgi_write_stdin_to_peer(fcgi, HIO_NULL, 0);
fcgi_mark_over (fcgi, FCGI_OVER_READ_FROM_CLIENT);
if (n <= -1) goto oops;
}
}
else
{
hio_oow_t rem;
HIO_ASSERT (hio, !(fcgi->over & FCGI_OVER_READ_FROM_CLIENT));
if (hio_htrd_feed(cli->htrd, buf, len, &rem) <= -1) goto oops;
if (rem > 0)
{
/* TODO store this to client buffer. once the current resource is completed, arrange to call on_read() with it */
HIO_DEBUG3 (hio, "HTTS(%p) - excessive data after contents by fcgi client %p(%d)\n", sck->hio, sck, (int)sck->hnd);
}
}
return 0;
oops:
fcgi_halt_participating_devices (fcgi);
return 0;
}
static int fcgi_client_on_write (hio_dev_sck_t* sck, hio_iolen_t wrlen, void* wrctx, const hio_skad_t* dstaddr)
{
hio_t* hio = sck->hio;
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(sck);
fcgi_t* fcgi = (fcgi_t*)cli->task;
if (wrlen <= -1)
{
HIO_DEBUG3 (hio, "HTTS(%p) - unable to write to client %p(%d)\n", sck->hio, sck, (int)sck->hnd);
goto oops;
}
if (wrlen == 0)
{
/* if the connect is keep-alive, this part may not be called */
fcgi->num_pending_writes_to_client--;
HIO_ASSERT (hio, fcgi->num_pending_writes_to_client == 0);
HIO_DEBUG3 (hio, "HTTS(%p) - indicated EOF to client %p(%d)\n", fcgi->htts, sck, (int)sck->hnd);
/* since EOF has been indicated to the client, it must not write to the client any further.
* this also means that i don't need any data from the peer side either.
* i don't need to enable input watching on the peer side */
fcgi_mark_over (fcgi, FCGI_OVER_WRITE_TO_CLIENT);
}
else
{
HIO_ASSERT (hio, fcgi->num_pending_writes_to_client > 0);
fcgi->num_pending_writes_to_client--;
if (fcgi->peer && fcgi->num_pending_writes_to_client == FCGI_PENDING_IO_THRESHOLD_TO_CLIENT)
{
#if 0 // TODO
if (!(fcgi->over & FCGI_OVER_READ_FROM_PEER) && hio_svc_fcgic_read(fcgi->peer, 1) <= -1) goto oops;
#endif
}
if ((fcgi->over & FCGI_OVER_READ_FROM_PEER) && fcgi->num_pending_writes_to_client <= 0)
{
fcgi_mark_over (fcgi, FCGI_OVER_WRITE_TO_CLIENT);
}
}
return 0;
oops:
fcgi_halt_participating_devices (fcgi);
return 0;
}
static int peer_capture_request_header (hio_htre_t* req, const hio_bch_t* key, const hio_htre_hdrval_t* val, void* ctx)
{
fcgi_t* fcgi = (fcgi_t*)ctx;
hio_svc_htts_t* htts = fcgi->htts;
hio_t* hio = htts->hio;
if (hio_comp_bcstr(key, "Connection", 1) != 0 &&
hio_comp_bcstr(key, "Transfer-Encoding", 1) != 0 &&
hio_comp_bcstr(key, "Content-Length", 1) != 0 &&
hio_comp_bcstr(key, "Expect", 1) != 0)
{
hio_oow_t val_offset;
hio_bch_t* ptr;
if (hio_comp_bcstr(key, "Content-Type", 1) == 0)
{
/* don't prefix CONTENT_TYPE with HTTP_ */
hio_becs_clear (htts->becbuf);
}
else
{
if (hio_becs_cpy(htts->becbuf, "HTTP_") == (hio_oow_t)-1) return -1;
}
if (hio_becs_cat(htts->becbuf, key) == (hio_oow_t)-1 ||
hio_becs_ccat(htts->becbuf, '\0') == (hio_oow_t)-1) return -1;
for (ptr = HIO_BECS_PTR(htts->becbuf); *ptr; ptr++)
{
*ptr = hio_to_bch_upper(*ptr);
if (*ptr =='-') *ptr = '_';
}
val_offset = HIO_BECS_LEN(htts->becbuf);
if (hio_becs_cat(htts->becbuf, val->ptr) == (hio_oow_t)-1) return -1;
val = val->next;
while (val)
{
if (hio_becs_cat(htts->becbuf, ",") == (hio_oow_t)-1 ||
hio_becs_cat(htts->becbuf, val->ptr) == (hio_oow_t)-1) return -1;
val = val->next;
}
hio_svc_fcgic_writeparam(fcgi->peer, HIO_BECS_PTR(htts->becbuf), val_offset - 1, HIO_BECS_CPTR(htts->becbuf, val_offset), HIO_BECS_LEN(htts->becbuf) - val_offset);
/* TODO: error handling? */
}
return 0;
}
static int write_params (fcgi_t* fcgi, hio_dev_sck_t* csck, hio_htre_t* req, const hio_bch_t* docroot, const hio_bch_t* script)
{
hio_t* hio = fcgi->htts->hio;
hio_bch_t tmp[256];
hio_oow_t len;
const hio_bch_t* qparam;
hio_oow_t content_length;
hio_bch_t* actual_script = HIO_NULL;
hio_becs_t dbuf;
HIO_ASSERT (hio, fcgi->csck == csck);
actual_script = hio_svc_htts_dupmergepaths(fcgi->htts, docroot, script);
if (!actual_script) goto oops;
if (hio_svc_fcgic_writeparam(fcgi->peer, "GATEWAY_INTERFACE", 17, "FCGI/1.1", 7) <= -1) goto oops;
len = hio_fmttobcstr(hio, tmp, HIO_COUNTOF(tmp), "HTTP/%d.%d", (int)hio_htre_getmajorversion(req), (int)hio_htre_getminorversion(req));
if (hio_svc_fcgic_writeparam(fcgi->peer, "SERVER_PROTOCOL", 15, tmp, len) <= -1) goto oops;
if (hio_svc_fcgic_writeparam(fcgi->peer, "DOCUMENT_ROOT", 13, docroot, hio_count_bcstr(docroot)) <= -1) goto oops;
if (hio_svc_fcgic_writeparam(fcgi->peer, "SCRIPT_NAME", 11, script, hio_count_bcstr(script)) <= -1) goto oops;
if (hio_svc_fcgic_writeparam(fcgi->peer, "SCRIPT_FILENAME", 15, actual_script, hio_count_bcstr(actual_script)) <= -1) goto oops;
// TODO: PATH_INFO
if (hio_svc_fcgic_writeparam(fcgi->peer, "REQUEST_METHOD", 14, hio_htre_getqmethodname(req), hio_htre_getqmethodlen(req)) <= -1) goto oops;
if (hio_svc_fcgic_writeparam(fcgi->peer, "REQUEST_URI", 11, hio_htre_getqpath(req), hio_htre_getqpathlen(req)) <= -1) goto oops;
qparam = hio_htre_getqparam(req);
if (!qparam) qparam = "";
if (hio_svc_fcgic_writeparam(fcgi->peer, "QUERY_STRING", 12, qparam, hio_count_bcstr(qparam)) <= -1) goto oops;
if (hio_htre_getreqcontentlen(req, &content_length) == 0)
{
/* content length is known and fixed */
len = hio_fmt_uintmax_to_bcstr(tmp, HIO_COUNTOF(tmp), content_length, 10, 0, '\0', HIO_NULL);
if (hio_svc_fcgic_writeparam(fcgi->peer, "CONTENT_LENGTH", 14, tmp, len) <= -1) goto oops;
}
if (hio_svc_fcgic_writeparam(fcgi->peer, "SERVER_SOFTWARE", 15, fcgi->htts->server_name, hio_count_bcstr(fcgi->htts->server_name)) <= -1) goto oops;
len = hio_skadtobcstr (hio, &csck->localaddr, tmp, HIO_COUNTOF(tmp), HIO_SKAD_TO_BCSTR_ADDR);
if (hio_svc_fcgic_writeparam(fcgi->peer, "SERVER_ADDR", 11, tmp, len) <= -1) goto oops;
gethostname (tmp, HIO_COUNTOF(tmp)); /* if this fails, i assume tmp contains the ip address set by hio_skadtobcstr() above */
if (hio_svc_fcgic_writeparam(fcgi->peer, "SERVER_NAME", 11, tmp, hio_count_bcstr(tmp)) <= -1) goto oops;
len = hio_skadtobcstr (hio, &csck->localaddr, tmp, HIO_COUNTOF(tmp), HIO_SKAD_TO_BCSTR_PORT);
if (hio_svc_fcgic_writeparam(fcgi->peer, "SERVER_PORT", 11, tmp, len) <= -1) goto oops;
len = hio_skadtobcstr (hio, &csck->remoteaddr, tmp, HIO_COUNTOF(tmp), HIO_SKAD_TO_BCSTR_ADDR);
if (hio_svc_fcgic_writeparam(fcgi->peer, "REMOTE_ADDR", 11, tmp, len) <= -1) goto oops;
len = hio_skadtobcstr (hio, &csck->remoteaddr, tmp, HIO_COUNTOF(tmp), HIO_SKAD_TO_BCSTR_PORT);
if (hio_svc_fcgic_writeparam(fcgi->peer, "REMOTE_PORT", 11, tmp, len) <= -1) goto oops;
hio_htre_walkheaders (req, peer_capture_request_header, fcgi);
/* [NOTE] trailers are not available when this cgi resource is started. let's not call hio_htre_walktrailers() */
hio_freemem (hio, actual_script);
return 0;
oops:
if (actual_script) hio_freemem (hio, actual_script);
return -1;
}
static void bind_task_to_client (fcgi_t* fcgi, hio_dev_sck_t* csck)
{
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(csck);
HIO_ASSERT (fcgi->htts->hio, cli->sck == csck);
HIO_ASSERT (fcgi->htts->hio, cli->task == HIO_NULL);
fcgi->csck = csck;
fcgi->task_client = cli;
/* remember the client socket's io event handlers */
fcgi->client_org_on_read = csck->on_read;
fcgi->client_org_on_write = csck->on_write;
fcgi->client_org_on_disconnect = csck->on_disconnect;
/* set new io events handlers on the client socket */
csck->on_read = fcgi_client_on_read;
csck->on_write = fcgi_client_on_write;
csck->on_disconnect = fcgi_client_on_disconnect;
cli->task = (hio_svc_htts_task_t*)fcgi;
HIO_SVC_HTTS_TASK_RCUP (fcgi);
}
static void unbind_task_from_client (fcgi_t* fcgi, int rcdown)
{
hio_dev_sck_t* csck = fcgi->csck;
HIO_ASSERT (fcgi->htts->hio, fcgi->task_client != HIO_NULL);
HIO_ASSERT (fcgi->htts->hio, fcgi->csck != HIO_NULL);
HIO_ASSERT (fcgi->htts->hio, fcgi->task_client->task == (hio_svc_htts_task_t*)fcgi);
HIO_ASSERT (fcgi->htts->hio, fcgi->task_client->htrd != HIO_NULL);
if (fcgi->client_htrd_recbs_changed)
{
hio_htrd_setrecbs (fcgi->task_client->htrd, &fcgi->client_htrd_org_recbs);
fcgi->client_htrd_recbs_changed = 0;
}
if (fcgi->client_org_on_read)
{
csck->on_read = fcgi->client_org_on_read;
fcgi->client_org_on_read = HIO_NULL;
}
if (fcgi->client_org_on_write)
{
csck->on_write = fcgi->client_org_on_write;
fcgi->client_org_on_write = HIO_NULL;
}
if (fcgi->client_org_on_disconnect)
{
csck->on_disconnect = fcgi->client_org_on_disconnect;
fcgi->client_org_on_disconnect = HIO_NULL;
}
HIO_DEBUG2 (csck->hio, "UNBINDING CLEINT FROM TASK... client=%p csck=%p\n", fcgi->task_client, csck);
/* there is some ordering issue in using HIO_SVC_HTTS_TASK_UNREF()
* because it can destroy the fcgi itself. so reset fcgi->task_client->task
* to null and call RCDOWN() later */
fcgi->task_client->task = HIO_NULL;
fcgi->task_client = HIO_NULL;
fcgi->csck = HIO_NULL;
if (!fcgi->client_disconnected && (!fcgi->keep_alive || hio_dev_sck_read(csck, 1) <= -1))
{
HIO_DEBUG2 (fcgi->htts->hio, "HTTS(%p) - halting client(%p) for failure to enable input watching\n", fcgi->htts, csck);
hio_dev_sck_halt (csck);
}
if (rcdown) HIO_SVC_HTTS_TASK_RCDOWN ((hio_svc_htts_task_t*)fcgi);
}
static int bind_task_to_peer (fcgi_t* fcgi, const hio_skad_t* fcgis_addr)
{
hio_htrd_t* htrd;
fcgi_peer_xtn_t* pxtn;
htrd = hio_htrd_open(fcgi->htts->hio, HIO_SIZEOF(*pxtn));
if (HIO_UNLIKELY(!htrd)) return -1;
hio_htrd_setoption (htrd, HIO_HTRD_SKIP_INITIAL_LINE | HIO_HTRD_RESPONSE);
hio_htrd_setrecbs (htrd, &peer_htrd_recbs);
fcgi->peer = hio_svc_fcgic_tie(fcgi->htts->fcgic, fcgis_addr, fcgi_peer_on_read, fcgi_peer_on_write, fcgi_peer_on_untie, fcgi);
if (HIO_UNLIKELY(!fcgi->peer))
{
hio_htrd_close (htrd);
return -1;
}
pxtn = hio_htrd_getxtn(htrd);
pxtn->fcgi = fcgi;
fcgi->peer_htrd = htrd;
HIO_SVC_HTTS_TASK_RCUP (fcgi); /* for peer_htrd extension */
HIO_SVC_HTTS_TASK_RCUP (fcgi); /* for fcgi->peer->ctx in the tie() */
return 0;
}
static void unbind_task_from_peer (fcgi_t* fcgi, int rcdown)
{
int n = 0;
if (fcgi->peer_htrd)
{
hio_htrd_close (fcgi->peer_htrd);
fcgi->peer_htrd = HIO_NULL;
n++;
}
if (fcgi->peer)
{
/* hio-svc_fcgic_untie() is not a delayed operation unlike hio_dev_sck_halt().
* TODO: check if this is a buggy idea */
hio_svc_fcgic_untie (fcgi->peer);
fcgi->peer = HIO_NULL;
n++;
}
if (rcdown)
{
while (n > 0)
{
n--;
HIO_SVC_HTTS_TASK_RCDOWN((hio_svc_htts_task_t*)fcgi);
}
}
}
static int setup_for_expect100 (fcgi_t* fcgi, hio_htre_t* req, int options)
{
#if !defined(FCGI_ALLOW_UNLIMITED_REQ_CONTENT_LENGTH)
if (fcgi->req_content_length_unlimited)
{
/* Transfer-Encoding is chunked. no content-length is known in advance. */
/* option 1. buffer contents. if it gets too large, send 413 Request Entity Too Large.
* option 2. send 411 Length Required immediately
* option 3. set Content-Length to -1 and use EOF to indicate the end of content [Non-Standard] */
if (fcgi_send_final_status_to_client(fcgi, HIO_HTTP_STATUS_LENGTH_REQUIRED, 1) <= -1) return -1;
}
#endif
if (req->flags & HIO_HTRE_ATTR_EXPECT100)
{
/* TODO: Expect: 100-continue? who should handle this? fcgi? or the http server? */
/* CAN I LET the fcgi SCRIPT handle this? */
if (!(options & HIO_SVC_HTTS_FCGI_NO_100_CONTINUE) &&
hio_comp_http_version_numbers(&req->version, 1, 1) >= 0 &&
(fcgi->req_content_length_unlimited || fcgi->req_content_length > 0))
{
/*
* Don't send 100 Continue if http verions is lower than 1.1
* [RFC7231]
* A server that receives a 100-continue expectation in an HTTP/1.0
* request MUST ignore that expectation.
*
* Don't send 100 Continue if expected content lenth is 0.
* [RFC7231]
* A server MAY omit sending a 100 (Continue) response if it has
* already received some or all of the message body for the
* corresponding request, or if the framing indicates that there is
* no message body.
*/
hio_bch_t msgbuf[64];
hio_oow_t msglen;
msglen = hio_fmttobcstr(fcgi->htts->hio, msgbuf, HIO_COUNTOF(msgbuf), "HTTP/%d.%d %d %hs\r\n\r\n", fcgi->task_req_version.major, fcgi->task_req_version.minor, HIO_HTTP_STATUS_CONTINUE, hio_http_status_to_bcstr(HIO_HTTP_STATUS_CONTINUE));
if (fcgi_write_to_client(fcgi, msgbuf, msglen) <= -1) return -1;
fcgi->ever_attempted_to_write_to_client = 0; /* reset this as it's polluted for 100 continue */
}
}
else if (req->flags & HIO_HTRE_ATTR_EXPECT)
{
/* 417 Expectation Failed */
fcgi_send_final_status_to_client(fcgi, HIO_HTTP_STATUS_EXPECTATION_FAILED, 1);
return -1;
}
return 0;
}
static int setup_for_content_length(fcgi_t* fcgi, hio_htre_t* req)
{
#if defined(FCGI_ALLOW_UNLIMITED_REQ_CONTENT_LENGTH)
if (fcgi->req_content_length_unlimited)
{
/* change the callbacks to subscribe to contents to be uploaded */
fcgi->client_htrd_org_recbs = *hio_htrd_getrecbs(fcgi->task_client->htrd);
fcgi_client_htrd_recbs.peek = fcgi->client_htrd_org_recbs.peek;
hio_htrd_setrecbs (fcgi->task_client->htrd, &fcgi_client_htrd_recbs);
fcgi->client_htrd_recbs_changed = 1;
}
else
{
#endif
if (fcgi->req_content_length > 0)
{
/* change the callbacks to subscribe to contents to be uploaded */
fcgi->client_htrd_org_recbs = *hio_htrd_getrecbs(fcgi->task_client->htrd);
fcgi_client_htrd_recbs.peek = fcgi->client_htrd_org_recbs.peek;
hio_htrd_setrecbs (fcgi->task_client->htrd, &fcgi_client_htrd_recbs);
fcgi->client_htrd_recbs_changed = 1;
}
else
{
/* no content to be uploaded from the client */
/* indicate end of stdin to the peer and disable input wathching from the client */
if (fcgi_write_stdin_to_peer(fcgi, HIO_NULL, 0) <= -1) return -1;
fcgi_mark_over (fcgi, FCGI_OVER_READ_FROM_CLIENT | FCGI_OVER_WRITE_TO_PEER);
}
#if defined(FCGI_ALLOW_UNLIMITED_REQ_CONTENT_LENGTH)
}
#endif
/* this may change later if Content-Length is included in the fcgi output */
if (req->flags & HIO_HTRE_ATTR_KEEPALIVE)
{
fcgi->keep_alive = 1;
fcgi->res_mode_to_cli = FCGI_RES_MODE_CHUNKED;
/* the mode still can get switched to FCGI_RES_MODE_LENGTH if the fcgi script emits Content-Length */
}
else
{
fcgi->keep_alive = 0;
fcgi->res_mode_to_cli = FCGI_RES_MODE_CLOSE;
}
return 0;
}
int hio_svc_htts_dofcgi (hio_svc_htts_t* htts, hio_dev_sck_t* csck, hio_htre_t* req, const hio_skad_t* fcgis_addr, const hio_bch_t* docroot, const hio_bch_t* script, int options, hio_svc_htts_task_on_kill_t on_kill)
{
hio_t* hio = htts->hio;
hio_svc_htts_cli_t* cli = hio_dev_sck_getxtn(csck);
fcgi_t* fcgi = HIO_NULL;
/* ensure that you call this function before any contents is received */
HIO_ASSERT (hio, hio_htre_getcontentlen(req) == 0);
if (HIO_UNLIKELY(!htts->fcgic))
{
hio_seterrbfmt (hio, HIO_ENOCAPA, "fcgi client service not enabled");
goto oops;
}
fcgi = (fcgi_t*)hio_svc_htts_task_make(htts, HIO_SIZEOF(*fcgi), fcgi_on_kill, req, cli);
if (HIO_UNLIKELY(!fcgi)) goto oops;
fcgi->on_kill = on_kill;
/*fcgi->num_pending_writes_to_client = 0;
fcgi->num_pending_writes_to_peer = 0;*/
fcgi->req_content_length_unlimited = hio_htre_getreqcontentlen(req, &fcgi->req_content_length);
bind_task_to_client (fcgi, csck);
if (bind_task_to_peer(fcgi, fcgis_addr) <= -1) goto oops;
if (setup_for_expect100(fcgi, req, options) <= -1) goto oops;
if (setup_for_content_length(fcgi, req) <= -1) goto oops;
/* TODO: store current input watching state and use it when destroying the fcgi data */
if (hio_dev_sck_read(csck, !(fcgi->over & FCGI_OVER_READ_FROM_CLIENT)) <= -1) goto oops;
/* send FCGI_BEGIN_REQUEST */
if (hio_svc_fcgic_beginrequest(fcgi->peer) <= -1) goto oops;
/* write FCGI_PARAM */
if (write_params(fcgi, csck, req, docroot, script) <= -1) goto oops;
if (hio_svc_fcgic_writeparam(fcgi->peer, HIO_NULL, 0, HIO_NULL, 0) <= -1) goto oops; /* end of params */
HIO_SVC_HTTS_TASKL_APPEND_TASK (&htts->task, (hio_svc_htts_task_t*)fcgi);
return 0;
oops:
HIO_DEBUG2 (hio, "HTTS(%p) - FAILURE in dofcgi - socket(%p)\n", htts, csck);
if (fcgi) fcgi_halt_participating_devices (fcgi);
return -1;
}
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