view src/os/unix/ngx_user.c @ 6949:ff0c8e11edbc

Simplified and improved sendfile() code on Linux. The ngx_linux_sendfile() function is now used for both normal sendfile() and sendfile in threads. The ngx_linux_sendfile_thread() function was modified to use the same interface as ngx_linux_sendfile(), and is simply called from ngx_linux_sendfile() when threads are enabled. Special return code NGX_DONE is used to indicate that a thread task was posted and no further actions are needed. If number of bytes sent is less that what we were sending, we now always retry sending. This is needed for sendfile() in threads as the number of bytes we are sending might have been changed since the thread task was posted. And this is also needed for Linux 4.3+, as sendfile() might be interrupted at any time and provides no indication if it was interrupted or not (ticket #1174).
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 28 Mar 2017 18:15:39 +0300
parents e284f3ff6831
children 4a670c18e5e6
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


/*
 * Solaris has thread-safe crypt()
 * Linux has crypt_r(); "struct crypt_data" is more than 128K
 * FreeBSD needs the mutex to protect crypt()
 *
 * TODO:
 *     ngx_crypt_init() to init mutex
 */


#if (NGX_CRYPT)

#if (NGX_HAVE_GNU_CRYPT_R)

ngx_int_t
ngx_libc_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
{
    char               *value;
    size_t              len;
    struct crypt_data   cd;

    cd.initialized = 0;
#ifdef __GLIBC__
    /* work around the glibc bug */
    cd.current_salt[0] = ~salt[0];
#endif

    value = crypt_r((char *) key, (char *) salt, &cd);

    if (value) {
        len = ngx_strlen(value) + 1;

        *encrypted = ngx_pnalloc(pool, len);
        if (*encrypted == NULL) {
            return NGX_ERROR;
        }

        ngx_memcpy(*encrypted, value, len);
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_CRIT, pool->log, ngx_errno, "crypt_r() failed");

    return NGX_ERROR;
}

#else

ngx_int_t
ngx_libc_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
{
    char       *value;
    size_t      len;
    ngx_err_t   err;

    value = crypt((char *) key, (char *) salt);

    if (value) {
        len = ngx_strlen(value) + 1;

        *encrypted = ngx_pnalloc(pool, len);
        if (*encrypted == NULL) {
            return NGX_ERROR;
        }

        ngx_memcpy(*encrypted, value, len);
        return NGX_OK;
    }

    err = ngx_errno;

    ngx_log_error(NGX_LOG_CRIT, pool->log, err, "crypt() failed");

    return NGX_ERROR;
}

#endif

#endif /* NGX_CRYPT */