Mercurial > hg > nginx
view src/os/unix/ngx_linux_aio_read.c @ 7623:72b792bb3885
HTTP/2: fixed socket leak with an incomplete HEADERS frame.
A connection could get stuck without timers if a client has partially sent
the HEADERS frame such that it was split on the individual header boundary.
In this case, it cannot be processed without the rest of the HEADERS frame.
The fix is to call ngx_http_v2_state_headers_save() in this case. Normally,
it would be called from the ngx_http_v2_state_header_block() handler on the
next iteration, when there is not enough data to continue processing. This
isn't the case if recv_buffer became empty and there's no more data to read.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Wed, 05 Feb 2020 16:29:23 +0300 |
parents | f01ab2dbcfdc |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> extern int ngx_eventfd; extern aio_context_t ngx_aio_ctx; static void ngx_file_aio_event_handler(ngx_event_t *ev); static int io_submit(aio_context_t ctx, long n, struct iocb **paiocb) { return syscall(SYS_io_submit, ctx, n, paiocb); } ngx_int_t ngx_file_aio_init(ngx_file_t *file, ngx_pool_t *pool) { ngx_event_aio_t *aio; aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t)); if (aio == NULL) { return NGX_ERROR; } aio->file = file; aio->fd = file->fd; aio->event.data = aio; aio->event.ready = 1; aio->event.log = file->log; file->aio = aio; return NGX_OK; } ssize_t ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset, ngx_pool_t *pool) { ngx_err_t err; struct iocb *piocb[1]; ngx_event_t *ev; ngx_event_aio_t *aio; if (!ngx_file_aio) { return ngx_read_file(file, buf, size, offset); } if (file->aio == NULL && ngx_file_aio_init(file, pool) != NGX_OK) { return NGX_ERROR; } aio = file->aio; ev = &aio->event; if (!ev->ready) { ngx_log_error(NGX_LOG_ALERT, file->log, 0, "second aio post for \"%V\"", &file->name); return NGX_AGAIN; } ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, "aio complete:%d @%O:%uz %V", ev->complete, offset, size, &file->name); if (ev->complete) { ev->active = 0; ev->complete = 0; if (aio->res >= 0) { ngx_set_errno(0); return aio->res; } ngx_set_errno(-aio->res); ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "aio read \"%s\" failed", file->name.data); return NGX_ERROR; } ngx_memzero(&aio->aiocb, sizeof(struct iocb)); aio->aiocb.aio_data = (uint64_t) (uintptr_t) ev; aio->aiocb.aio_lio_opcode = IOCB_CMD_PREAD; aio->aiocb.aio_fildes = file->fd; aio->aiocb.aio_buf = (uint64_t) (uintptr_t) buf; aio->aiocb.aio_nbytes = size; aio->aiocb.aio_offset = offset; aio->aiocb.aio_flags = IOCB_FLAG_RESFD; aio->aiocb.aio_resfd = ngx_eventfd; ev->handler = ngx_file_aio_event_handler; piocb[0] = &aio->aiocb; if (io_submit(ngx_aio_ctx, 1, piocb) == 1) { ev->active = 1; ev->ready = 0; ev->complete = 0; return NGX_AGAIN; } err = ngx_errno; if (err == NGX_EAGAIN) { return ngx_read_file(file, buf, size, offset); } ngx_log_error(NGX_LOG_CRIT, file->log, err, "io_submit(\"%V\") failed", &file->name); if (err == NGX_ENOSYS) { ngx_file_aio = 0; return ngx_read_file(file, buf, size, offset); } return NGX_ERROR; } static void ngx_file_aio_event_handler(ngx_event_t *ev) { ngx_event_aio_t *aio; aio = ev->data; ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0, "aio event handler fd:%d %V", aio->fd, &aio->file->name); aio->handler(ev); }