view src/mail/ngx_mail_imap_module.c @ 4728:fc62b72f7597 stable-1.2

Merge of r4690: conflicting wildcard server names fix. With previous code wildcard names were added to hash even if conflict was detected. This resulted in identical names in hash and segfault later in ngx_hash_wildcard_init().
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 02 Jul 2012 16:59:34 +0000
parents d620f497c50f
children ec01b1d1fff1
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_mail.h>
#include <ngx_mail_imap_module.h>


static void *ngx_mail_imap_create_srv_conf(ngx_conf_t *cf);
static char *ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent,
    void *child);


static ngx_str_t  ngx_mail_imap_default_capabilities[] = {
    ngx_string("IMAP4"),
    ngx_string("IMAP4rev1"),
    ngx_string("UIDPLUS"),
    ngx_null_string
};


static ngx_conf_bitmask_t  ngx_mail_imap_auth_methods[] = {
    { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
    { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
    { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
    { ngx_null_string, 0 }
};


static ngx_str_t  ngx_mail_imap_auth_methods_names[] = {
    ngx_string("AUTH=PLAIN"),
    ngx_string("AUTH=LOGIN"),
    ngx_null_string,  /* APOP */
    ngx_string("AUTH=CRAM-MD5"),
    ngx_null_string   /* NONE */
};


static ngx_mail_protocol_t  ngx_mail_imap_protocol = {
    ngx_string("imap"),
    { 143, 993, 0, 0 },
    NGX_MAIL_IMAP_PROTOCOL,

    ngx_mail_imap_init_session,
    ngx_mail_imap_init_protocol,
    ngx_mail_imap_parse_command,
    ngx_mail_imap_auth_state,

    ngx_string("* BAD internal server error" CRLF)
};


static ngx_command_t  ngx_mail_imap_commands[] = {

    { ngx_string("imap_client_buffer"),
      NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_MAIL_SRV_CONF_OFFSET,
      offsetof(ngx_mail_imap_srv_conf_t, client_buffer_size),
      NULL },

    { ngx_string("imap_capabilities"),
      NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
      ngx_mail_capabilities,
      NGX_MAIL_SRV_CONF_OFFSET,
      offsetof(ngx_mail_imap_srv_conf_t, capabilities),
      NULL },

    { ngx_string("imap_auth"),
      NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
      ngx_conf_set_bitmask_slot,
      NGX_MAIL_SRV_CONF_OFFSET,
      offsetof(ngx_mail_imap_srv_conf_t, auth_methods),
      &ngx_mail_imap_auth_methods },

      ngx_null_command
};


static ngx_mail_module_t  ngx_mail_imap_module_ctx = {
    &ngx_mail_imap_protocol,               /* protocol */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    ngx_mail_imap_create_srv_conf,         /* create server configuration */
    ngx_mail_imap_merge_srv_conf           /* merge server configuration */
};


ngx_module_t  ngx_mail_imap_module = {
    NGX_MODULE_V1,
    &ngx_mail_imap_module_ctx,             /* module context */
    ngx_mail_imap_commands,                /* module directives */
    NGX_MAIL_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static void *
ngx_mail_imap_create_srv_conf(ngx_conf_t *cf)
{
    ngx_mail_imap_srv_conf_t  *iscf;

    iscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_imap_srv_conf_t));
    if (iscf == NULL) {
        return NULL;
    }

    iscf->client_buffer_size = NGX_CONF_UNSET_SIZE;

    if (ngx_array_init(&iscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
        != NGX_OK)
    {
        return NULL;
    }

    return iscf;
}


static char *
ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_mail_imap_srv_conf_t *prev = parent;
    ngx_mail_imap_srv_conf_t *conf = child;

    u_char      *p, *auth;
    size_t       size;
    ngx_str_t   *c, *d;
    ngx_uint_t   i, m;

    ngx_conf_merge_size_value(conf->client_buffer_size,
                              prev->client_buffer_size,
                              (size_t) ngx_pagesize);

    ngx_conf_merge_bitmask_value(conf->auth_methods,
                              prev->auth_methods,
                              (NGX_CONF_BITMASK_SET
                               |NGX_MAIL_AUTH_PLAIN_ENABLED));


    if (conf->capabilities.nelts == 0) {
        conf->capabilities = prev->capabilities;
    }

    if (conf->capabilities.nelts == 0) {

        for (d = ngx_mail_imap_default_capabilities; d->len; d++) {
            c = ngx_array_push(&conf->capabilities);
            if (c == NULL) {
                return NGX_CONF_ERROR;
            }

            *c = *d;
        }
    }

    size = sizeof("* CAPABILITY" CRLF) - 1;

    c = conf->capabilities.elts;
    for (i = 0; i < conf->capabilities.nelts; i++) {
        size += 1 + c[i].len;
    }

    for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
         m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
         m <<= 1, i++)
    {
        if (m & conf->auth_methods) {
            size += 1 + ngx_mail_imap_auth_methods_names[i].len;
        }
    }

    p = ngx_pnalloc(cf->pool, size);
    if (p == NULL) {
        return NGX_CONF_ERROR;
    }

    conf->capability.len = size;
    conf->capability.data = p;

    p = ngx_cpymem(p, "* CAPABILITY", sizeof("* CAPABILITY") - 1);

    for (i = 0; i < conf->capabilities.nelts; i++) {
        *p++ = ' ';
        p = ngx_cpymem(p, c[i].data, c[i].len);
    }

    auth = p;

    for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
         m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
         m <<= 1, i++)
    {
        if (m & conf->auth_methods) {
            *p++ = ' ';
            p = ngx_cpymem(p, ngx_mail_imap_auth_methods_names[i].data,
                           ngx_mail_imap_auth_methods_names[i].len);
        }
    }

    *p++ = CR; *p = LF;


    size += sizeof(" STARTTLS") - 1;

    p = ngx_pnalloc(cf->pool, size);
    if (p == NULL) {
        return NGX_CONF_ERROR;
    }

    conf->starttls_capability.len = size;
    conf->starttls_capability.data = p;

    p = ngx_cpymem(p, conf->capability.data,
                   conf->capability.len - (sizeof(CRLF) - 1));
    p = ngx_cpymem(p, " STARTTLS", sizeof(" STARTTLS") - 1);
    *p++ = CR; *p = LF;


    size = (auth - conf->capability.data) + sizeof(CRLF) - 1
            + sizeof(" STARTTLS LOGINDISABLED") - 1;

    p = ngx_pnalloc(cf->pool, size);
    if (p == NULL) {
        return NGX_CONF_ERROR;
    }

    conf->starttls_only_capability.len = size;
    conf->starttls_only_capability.data = p;

    p = ngx_cpymem(p, conf->capability.data,
                   auth - conf->capability.data);
    p = ngx_cpymem(p, " STARTTLS LOGINDISABLED",
                   sizeof(" STARTTLS LOGINDISABLED") - 1);
    *p++ = CR; *p = LF;

    return NGX_CONF_OK;
}