xref: /unit/src/nxt_http_request.c (revision 2139:99d792169ffb)

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) NGINX, Inc.
 */

#include <nxt_router.h>
#include <nxt_http.h>


static nxt_int_t nxt_http_validate_host(nxt_str_t *host, nxt_mp_t *mp);
static void nxt_http_request_start(nxt_task_t *task, void *obj, void *data);
static nxt_int_t nxt_http_request_forward(nxt_task_t *task,
    nxt_http_request_t *r, nxt_http_forward_t *forward);
static void nxt_http_request_forward_client_ip(nxt_http_request_t *r,
    nxt_http_forward_t *forward, nxt_array_t *fields);
static nxt_sockaddr_t *nxt_http_request_client_ip_sockaddr(
    nxt_http_request_t *r, u_char *start, size_t len);
static void nxt_http_request_forward_protocol(nxt_http_request_t *r,
    nxt_http_field_t *field);
static void nxt_http_request_ready(nxt_task_t *task, void *obj, void *data);
static void nxt_http_request_proto_info(nxt_task_t *task,
    nxt_http_request_t *r);
static void nxt_http_request_mem_buf_completion(nxt_task_t *task, void *obj,
    void *data);
static void nxt_http_request_done(nxt_task_t *task, void *obj, void *data);

static u_char *nxt_http_date_cache_handler(u_char *buf, nxt_realtime_t *now,
    struct tm *tm, size_t size, const char *format);

static nxt_http_name_value_t *nxt_http_argument(nxt_array_t *array,
    u_char *name, size_t name_length, uint32_t hash, u_char *start,
    const u_char *end);
static nxt_int_t nxt_http_cookie_parse(nxt_array_t *cookies, u_char *start,
    const u_char *end);
static nxt_http_name_value_t *nxt_http_cookie(nxt_array_t *array, u_char *name,
    size_t name_length, u_char *start, const u_char *end);


#define NXT_HTTP_COOKIE_HASH                                                  \
    (nxt_http_field_hash_end(                                                 \
     nxt_http_field_hash_char(                                                \
     nxt_http_field_hash_char(                                                \
     nxt_http_field_hash_char(                                                \
     nxt_http_field_hash_char(                                                \
     nxt_http_field_hash_char(                                                \
     nxt_http_field_hash_char(NXT_HTTP_FIELD_HASH_INIT,                       \
        'c'), 'o'), 'o'), 'k'), 'i'), 'e')) & 0xFFFF)


static const nxt_http_request_state_t  nxt_http_request_init_state;
static const nxt_http_request_state_t  nxt_http_request_body_state;


nxt_time_string_t  nxt_http_date_cache = {
    (nxt_atomic_uint_t) -1,
    nxt_http_date_cache_handler,
    NULL,
    NXT_HTTP_DATE_LEN,
    NXT_THREAD_TIME_GMT,
    NXT_THREAD_TIME_SEC,
};


nxt_int_t
nxt_http_init(nxt_task_t *task)
{
    nxt_int_t  ret;

    ret = nxt_h1p_init(task);

    if (ret != NXT_OK) {
        return ret;
    }

    return nxt_http_response_hash_init(task);
}


nxt_int_t
nxt_http_request_host(void *ctx, nxt_http_field_t *field, uintptr_t data)
{
    nxt_int_t           ret;
    nxt_str_t           host;
    nxt_http_request_t  *r;

    r = ctx;

    if (nxt_slow_path(r->host.start != NULL)) {
        return NXT_HTTP_BAD_REQUEST;
    }

    host.length = field->value_length;
    host.start = field->value;

    ret = nxt_http_validate_host(&host, r->mem_pool);

    if (nxt_fast_path(ret == NXT_OK)) {
        r->host = host;
    }

    return ret;
}


static nxt_int_t
nxt_http_validate_host(nxt_str_t *host, nxt_mp_t *mp)
{
    u_char      *h, ch;
    size_t      i, dot_pos, host_length;
    nxt_bool_t  lowcase;

    enum {
        sw_usual,
        sw_literal,
        sw_rest
    } state;

    dot_pos = host->length;
    host_length = host->length;

    h = host->start;

    lowcase = 0;
    state = sw_usual;

    for (i = 0; i < host->length; i++) {
        ch = h[i];

        if (ch > ']') {
            /* Short path. */
            continue;
        }

        switch (ch) {

        case '.':
            if (dot_pos == i - 1) {
                return NXT_HTTP_BAD_REQUEST;
            }

            dot_pos = i;
            break;

        case ':':
            if (state == sw_usual) {
                host_length = i;
                state = sw_rest;
            }

            break;

        case '[':
            if (i == 0) {
                state = sw_literal;
            }

            break;

        case ']':
            if (state == sw_literal) {
                host_length = i + 1;
                state = sw_rest;
            }

            break;

        case '/':
            return NXT_HTTP_BAD_REQUEST;

        default:
            if (ch >= 'A' && ch <= 'Z') {
                lowcase = 1;
            }

            break;
        }
    }

    if (dot_pos == host_length - 1) {
        host_length--;
    }

    host->length = host_length;

    if (lowcase) {
        host->start = nxt_mp_nget(mp, host_length);
        if (nxt_slow_path(host->start == NULL)) {
            return NXT_HTTP_INTERNAL_SERVER_ERROR;
        }

        nxt_memcpy_lowcase(host->start, h, host_length);
    }

    return NXT_OK;
}


nxt_int_t
nxt_http_request_field(void *ctx, nxt_http_field_t *field, uintptr_t offset)
{
    nxt_http_request_t  *r;

    r = ctx;

    nxt_value_at(nxt_http_field_t *, r, offset) = field;

    return NXT_OK;
}


nxt_int_t
nxt_http_request_content_length(void *ctx, nxt_http_field_t *field,
    uintptr_t data)
{
    nxt_off_t           n, max_body_size;
    nxt_http_request_t  *r;

    r = ctx;

    if (nxt_fast_path(r->content_length == NULL)) {
        r->content_length = field;

        n = nxt_off_t_parse(field->value, field->value_length);

        if (nxt_fast_path(n >= 0)) {
            r->content_length_n = n;

            max_body_size = r->conf->socket_conf->max_body_size;

            if (nxt_slow_path(n > max_body_size)) {
                return NXT_HTTP_PAYLOAD_TOO_LARGE;
            }

            return NXT_OK;
        }
    }

    return NXT_HTTP_BAD_REQUEST;
}


nxt_http_request_t *
nxt_http_request_create(nxt_task_t *task)
{
    nxt_mp_t            *mp;
    nxt_buf_t           *last;
    nxt_http_request_t  *r;

    mp = nxt_mp_create(4096, 128, 512, 32);
    if (nxt_slow_path(mp == NULL)) {
        return NULL;
    }

    r = nxt_mp_zget(mp, sizeof(nxt_http_request_t));
    if (nxt_slow_path(r == NULL)) {
        goto fail;
    }

    r->resp.fields = nxt_list_create(mp, 8, sizeof(nxt_http_field_t));
    if (nxt_slow_path(r->resp.fields == NULL)) {
        goto fail;
    }

    last = nxt_mp_zget(mp, NXT_BUF_SYNC_SIZE);
    if (nxt_slow_path(last == NULL)) {
        goto fail;
    }

    nxt_buf_set_sync(last);
    nxt_buf_set_last(last);
    last->completion_handler = nxt_http_request_done;
    last->parent = r;
    r->last = last;

    r->mem_pool = mp;
    r->content_length_n = -1;
    r->resp.content_length_n = -1;
    r->state = &nxt_http_request_init_state;

    return r;

fail:

    nxt_mp_release(mp);

    return NULL;
}


static const nxt_http_request_state_t  nxt_http_request_init_state
    nxt_aligned(64) =
{
    .ready_handler = nxt_http_request_start,
    .error_handler = nxt_http_request_close_handler,
};


static void
nxt_http_request_start(nxt_task_t *task, void *obj, void *data)
{
    nxt_int_t           ret;
    nxt_socket_conf_t   *skcf;
    nxt_http_request_t  *r;

    r = obj;

    r->state = &nxt_http_request_body_state;

    skcf = r->conf->socket_conf;

    if (skcf->forwarded != NULL) {
        ret = nxt_http_request_forward(task, r, skcf->forwarded);
        if (nxt_slow_path(ret != NXT_OK)) {
            goto fail;
        }
    }

    if (skcf->client_ip != NULL) {
        ret = nxt_http_request_forward(task, r, skcf->client_ip);
        if (nxt_slow_path(ret != NXT_OK)) {
            goto fail;
        }
    }

    nxt_http_request_read_body(task, r);

    return;

fail:
    nxt_http_request_error(task, r, NXT_HTTP_INTERNAL_SERVER_ERROR);
}


static nxt_int_t
nxt_http_request_forward(nxt_task_t *task, nxt_http_request_t *r,
    nxt_http_forward_t *forward)
{
    nxt_int_t                  ret;
    nxt_array_t                *client_ip_fields;
    nxt_http_field_t           *f, **fields, *protocol_field;
    nxt_http_forward_header_t  *client_ip, *protocol;

    ret = nxt_http_route_addr_rule(r, forward->source, r->remote);
    if (ret <= 0) {
        return NXT_OK;
    }

    client_ip = &forward->client_ip;
    protocol = &forward->protocol;

    if (client_ip->header != NULL) {
        client_ip_fields = nxt_array_create(r->mem_pool, 1,
                                            sizeof(nxt_http_field_t *));
        if (nxt_slow_path(client_ip_fields == NULL)) {
            return NXT_ERROR;
        }

    } else {
        client_ip_fields = NULL;
    }

    protocol_field = NULL;

    nxt_list_each(f, r->fields) {
        if (client_ip_fields != NULL
            && f->hash == client_ip->header_hash
            && f->value_length > 0
            && f->name_length == client_ip->header->length
            && nxt_memcasecmp(f->name, client_ip->header->start,
                              client_ip->header->length) == 0)
        {
            fields = nxt_array_add(client_ip_fields);
            if (nxt_slow_path(fields == NULL)) {
                return NXT_ERROR;
            }

            *fields = f;
        }

        if (protocol->header != NULL
            && protocol_field == NULL
            && f->hash == protocol->header_hash
            && f->value_length > 0
            && f->name_length == protocol->header->length
            && nxt_memcasecmp(f->name, protocol->header->start,
                              protocol->header->length) == 0)
        {
            protocol_field = f;
        }
    } nxt_list_loop;

    if (client_ip_fields != NULL) {
        nxt_http_request_forward_client_ip(r, forward, client_ip_fields);
    }

    if (protocol_field != NULL) {
        nxt_http_request_forward_protocol(r, protocol_field);
    }

    return NXT_OK;
}


static void
nxt_http_request_forward_client_ip(nxt_http_request_t *r,
    nxt_http_forward_t *forward, nxt_array_t *fields)
{
    u_char            *start, *p;
    nxt_int_t         ret, i, len;
    nxt_sockaddr_t    *sa, *prev_sa;
    nxt_http_field_t  **f;

    prev_sa = r->remote;
    f = (nxt_http_field_t **) fields->elts;

    i = fields->nelts;

    while (i-- > 0) {
        start = f[i]->value;
        len = f[i]->value_length;

        do {
            for (p = start + len - 1; p > start; p--, len--) {
                if (*p != ' ' && *p != ',') {
                    break;
                }
            }

            for (/* void */; p > start; p--) {
                if (*p == ' ' || *p == ',') {
                    p++;
                    break;
                }
            }

            sa = nxt_http_request_client_ip_sockaddr(r, p, len - (p - start));
            if (nxt_slow_path(sa == NULL)) {
                if (prev_sa != NULL) {
                    r->remote = prev_sa;
                }

                return;
            }

            if (!forward->recursive) {
                r->remote = sa;
                return;
            }

            ret = nxt_http_route_addr_rule(r, forward->source, sa);
            if (ret <= 0 || (i == 0 && p == start)) {
                r->remote = sa;
                return;
            }

            prev_sa = sa;
            len = p - 1 - start;

        } while (len > 0);
    }
}


static nxt_sockaddr_t *
nxt_http_request_client_ip_sockaddr(nxt_http_request_t *r, u_char *start,
    size_t len)
{
    nxt_str_t       addr;
    nxt_sockaddr_t  *sa;

    addr.start = start;
    addr.length = len;

    sa = nxt_sockaddr_parse_optport(r->mem_pool, &addr);
    if (nxt_slow_path(sa == NULL)) {
        return NULL;
    }

    switch (sa->u.sockaddr.sa_family) {
        case AF_INET:
            if (sa->u.sockaddr_in.sin_addr.s_addr == INADDR_ANY) {
                return NULL;
            }

            break;

#if (NXT_INET6)
        case AF_INET6:
            if (IN6_IS_ADDR_UNSPECIFIED(&sa->u.sockaddr_in6.sin6_addr)) {
                return NULL;
            }

            break;
#endif /* NXT_INET6 */

        default:
            return NULL;