view src/imap/ngx_imap_parse.c @ 485:4ebe09b07e30 release-0.1.17

nginx-0.1.17-RELEASE import *) Change: the ngx_http_rewrite_module was rewritten from the scratch. Now it is possible to redirect, to return the error codes, to check the variables and referrers. The directives can be used inside locations. The redirect directive was canceled. *) Feature: the ngx_http_geo_module. *) Feature: the proxy_set_x_var and fastcgi_set_var directives. *) Bugfix: the location configuration with "=" modifier may be used in another location. *) Bugfix: the correct content type was set only for requests that use small caps letters in extension. *) Bugfix: if the proxy_pass or fastcgi_pass directives were set in the location, and access was denied, and the error was redirected to a static page, then the segmentation fault occurred. *) Bugfix: if in a proxied "Location" header was a relative URL, then a host name and a slash were added to them; the bug had appeared in 0.1.14. *) Bugfix: the system error message was not logged on Linux.
author Igor Sysoev <igor@sysoev.ru>
date Thu, 03 Feb 2005 19:33:37 +0000
parents 42d11f017717
children d4ea69372b94
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 */


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


ngx_int_t ngx_pop3_parse_command(ngx_imap_session_t *s)
{
    u_char      ch, *p, *c;
    ngx_str_t  *arg;
    enum {
        sw_start = 0,
        sw_spaces_before_argument,
        sw_argument,
        sw_almost_done,
        sw_done
    } state;

    state = s->state;
    p = s->buffer->pos;

    while (p < s->buffer->last && state < sw_done) {
        ch = *p++;

        switch (state) {

        /* POP3 command */

        case sw_start:
            if (ch == ' ' || ch == CR || ch == LF) {
                c = s->buffer->start;

                if (p - 1 - c == 4) {

                    if (c[0] == 'U' && c[1] == 'S'
                        && c[2] == 'E' && c[3] == 'R')
                    {
                        s->command = NGX_POP3_USER;

                    } else if (c[0] == 'P' && c[1] == 'A'
                               && c[2] == 'S' && c[3] == 'S')
                    {
                        s->command = NGX_POP3_PASS;

                    } else if (c[0] == 'Q' && c[1] == 'U'
                               && c[2] == 'I' && c[3] == 'T')
                    {
                        s->command = NGX_POP3_QUIT;

#if 0
                    } else if (c[0] == 'N' && c[1] == 'O'
                               && c[2] == 'O' && c[3] == 'P')
                    {
                        s->command = NGX_POP3_NOOP;
#endif

                    } else {
                        s->state = sw_start;
                        return NGX_IMAP_PARSE_INVALID_COMMAND;
                    }

                } else {
                    s->state = sw_start;
                    return NGX_IMAP_PARSE_INVALID_COMMAND;
                }

                switch (ch) {
                case ' ':
                    state = sw_spaces_before_argument;
                    break;
                case CR:
                    state = sw_almost_done;
                    break;
                case LF:
                    state = sw_done;
                    break;
                }
                break;
            }

            if (ch < 'A' || ch > 'Z') {
                s->state = sw_start;
                return NGX_IMAP_PARSE_INVALID_COMMAND;
            }

            break;

        /* the spaces before the argument */
        case sw_spaces_before_argument:
            switch (ch) {
            case ' ':
                break;
            case CR:
                state = sw_almost_done;
                s->arg_end = p - 1;
                break;
            case LF:
                state = sw_done;
                s->arg_end = p - 1;
                break;
            default:
                if (s->args.nelts > 2) {
                    s->state = sw_start;
                    return NGX_IMAP_PARSE_INVALID_COMMAND;
                }

                state = sw_argument;
                s->arg_start = p - 1;
                break;
            }
            break;

        /* the argument */
        case sw_argument:
            switch (ch) {
            case ' ':
            case CR:
            case LF:
                if (!(arg = ngx_array_push(&s->args))) {
                    return NGX_ERROR;
                }
                arg->len = p - 1 - s->arg_start;
                arg->data = s->arg_start;
                s->arg_start = NULL;

                switch (ch) {
                case ' ':
                    state = sw_spaces_before_argument;
                    break;
                case CR:
                    state = sw_almost_done;
                    break;
                case LF:
                    state = sw_done;
                    break;
                }
                break;

            default:
                break;
            }
            break;

        /* end of request line */
        case sw_almost_done:
            switch (ch) {
            case LF:
                state = sw_done;
                break;
            default:
                s->state = sw_start;
                return NGX_IMAP_PARSE_INVALID_COMMAND;
            }
            break;

        /* suppress warning */
        case sw_done:
            break;
        }
    }

    s->buffer->pos = p;

    if (state == sw_done) {
        if (s->arg_start) {
            if (!(arg = ngx_array_push(&s->args))) {
                return NGX_ERROR;
            }
            arg->len = s->arg_end - s->arg_start;
            arg->data = s->arg_start;
            s->arg_start = NULL;
        }

        s->state = sw_start;
        return NGX_OK;

    } else {
        s->state = state;
        return NGX_AGAIN;
    }
}