mod_proxy.c

apache简化版

	if (sscanf(q + 1, "%u", &port) != 1 || port > 65535)
	    return "ProxyRemote: Bad syntax for a remote proxy server (bad port number)";
	*q = '\0';
    }
    else
	port = -1;
    *p = '\0';
    if (strchr(f, ':') == NULL)
	ap_str_tolower(f);		/* lowercase scheme */
    ap_str_tolower(p + 3);		/* lowercase hostname */

    if (port == -1) {
	int i;
	for (i = 0; defports[i].scheme != NULL; i++)
	    if (strcasecmp(defports[i].scheme, r) == 0)
		break;
	port = defports[i].port;
    }

    new = ap_push_array(conf->proxies);
    new->scheme = f;
    new->protocol = r;
    new->hostname = p + 3;
    new->port = port;
    return NULL;
}

static const char *
     add_pass(cmd_parms *cmd, void *dummy, char *f, char *r)
{
    server_rec *s = cmd->server;
    proxy_server_conf *conf =
    (proxy_server_conf *) ap_get_module_config(s->module_config, &proxy_module);
    struct proxy_alias *new;

    new = ap_push_array(conf->aliases);
    new->fake = f;
    new->real = r;
    return NULL;
}

static const char *
    add_pass_reverse(cmd_parms *cmd, void *dummy, char *f, char *r)
{
    server_rec *s = cmd->server;
    proxy_server_conf *conf;
    struct proxy_alias *new;

    conf = (proxy_server_conf *)ap_get_module_config(s->module_config, 
                                                  &proxy_module);
    new = ap_push_array(conf->raliases);
    new->fake = f;
    new->real = r;
    return NULL;
}

static const char *
     set_proxy_exclude(cmd_parms *parms, void *dummy, char *arg)
{
    server_rec *s = parms->server;
    proxy_server_conf *conf =
    ap_get_module_config(s->module_config, &proxy_module);
    struct noproxy_entry *new;
    struct noproxy_entry *list = (struct noproxy_entry *) conf->noproxies->elts;
    struct hostent hp;
    int found = 0;
    int i;

    /* Don't duplicate entries */
    for (i = 0; i < conf->noproxies->nelts; i++) {
	if (strcasecmp(arg, list[i].name) == 0) /* ignore case for host names */
	    found = 1;
    }

    if (!found) {
	new = ap_push_array(conf->noproxies);
	new->name = arg;
	/* Don't do name lookups on things that aren't dotted */
	if (strchr(arg, '.') != NULL && ap_proxy_host2addr(new->name, &hp) == NULL)
	    /*@@@FIXME: This copies only the first of (possibly many) IP addrs */
	    memcpy(&new->addr, hp.h_addr, sizeof(struct in_addr));
	else
	    new->addr.s_addr = 0;
    }
    return NULL;
}

/*
 * Set the ports CONNECT can use
 */
static const char *
    set_allowed_ports(cmd_parms *parms, void *dummy, char *arg)
{
    server_rec *s = parms->server;
    proxy_server_conf *conf =
      ap_get_module_config(s->module_config, &proxy_module);
    int *New;

    if (!isdigit(arg[0]))
	return "AllowCONNECT: port number must be numeric";

    New = ap_push_array(conf->allowed_connect_ports);
    *New = atoi(arg);
    return NULL;
}

/* Similar to set_proxy_exclude(), but defining directly connected hosts,
 * which should never be accessed via the configured ProxyRemote servers
 */
static const char *
     set_proxy_dirconn(cmd_parms *parms, void *dummy, char *arg)
{
    server_rec *s = parms->server;
    proxy_server_conf *conf =
    ap_get_module_config(s->module_config, &proxy_module);
    struct dirconn_entry *New;
    struct dirconn_entry *list = (struct dirconn_entry *) conf->dirconn->elts;
    int found = 0;
    int i;

    /* Don't duplicate entries */
    for (i = 0; i < conf->dirconn->nelts; i++) {
	if (strcasecmp(arg, list[i].name) == 0)
	    found = 1;
    }

    if (!found) {
	New = ap_push_array(conf->dirconn);
	New->name = arg;
	New->hostentry = NULL;

	if (ap_proxy_is_ipaddr(New, parms->pool)) {
#if DEBUGGING
	    fprintf(stderr, "Parsed addr %s\n", inet_ntoa(New->addr));
	    fprintf(stderr, "Parsed mask %s\n", inet_ntoa(New->mask));
#endif
	}
	else if (ap_proxy_is_domainname(New, parms->pool)) {
	    ap_str_tolower(New->name);
#if DEBUGGING
	    fprintf(stderr, "Parsed domain %s\n", New->name);
#endif
	}
	else if (ap_proxy_is_hostname(New, parms->pool)) {
	    ap_str_tolower(New->name);
#if DEBUGGING
	    fprintf(stderr, "Parsed host %s\n", New->name);
#endif
	}
	else {
	    ap_proxy_is_word(New, parms->pool);
#if DEBUGGING
	    fprintf(stderr, "Parsed word %s\n", New->name);
#endif
	}
    }
    return NULL;
}

static const char *
     set_proxy_domain(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);

    if (arg[0] != '.')
	return "ProxyDomain: domain name must start with a dot.";

    psf->domain = arg;
    return NULL;
}

static const char *
     set_proxy_req(cmd_parms *parms, void *dummy, int flag)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);

    psf->req = flag;
    return NULL;
}


static const char *
     set_cache_size(cmd_parms *parms, char *struct_ptr, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    int val;

    if (sscanf(arg, "%d", &val) != 1)
	return "CacheSize value must be an integer (kBytes)";
    psf->cache.space = val;
    return NULL;
}

static const char *
     set_cache_root(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);

    psf->cache.root = arg;

    return NULL;
}

static const char *
     set_cache_factor(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    double val;

    if (sscanf(arg, "%lg", &val) != 1)
	return "CacheLastModifiedFactor value must be a float";
    psf->cache.lmfactor = val;

    return NULL;
}

static const char *
     set_cache_maxex(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    double val;

    if (sscanf(arg, "%lg", &val) != 1)
	return "CacheMaxExpire value must be a float";
    psf->cache.maxexpire = (int) (val * (double) SEC_ONE_HR);
    return NULL;
}

static const char *
     set_cache_defex(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    double val;

    if (sscanf(arg, "%lg", &val) != 1)
	return "CacheDefaultExpire value must be a float";
    psf->cache.defaultexpire = (int) (val * (double) SEC_ONE_HR);
    return NULL;
}

static const char *
     set_cache_gcint(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    double val;

    if (sscanf(arg, "%lg", &val) != 1)
	return "CacheGcInterval value must be a float";
    psf->cache.gcinterval = (int) (val * (double) SEC_ONE_HR);
    return NULL;
}

static const char *
     set_cache_dirlevels(cmd_parms *parms, char *struct_ptr, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    int val;

    val = atoi(arg);
    if (val < 1)
	return "CacheDirLevels value must be an integer greater than 0";
    if (val * psf->cache.dirlength > CACHEFILE_LEN)
	return "CacheDirLevels*CacheDirLength value must not be higher than 20";
    psf->cache.dirlevels = val;
    return NULL;
}

static const char *
     set_cache_dirlength(cmd_parms *parms, char *struct_ptr, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    int val;

    val = atoi(arg);
    if (val < 1)
	return "CacheDirLength value must be an integer greater than 0";
    if (val * psf->cache.dirlevels > CACHEFILE_LEN)
	return "CacheDirLevels*CacheDirLength value must not be higher than 20";
    psf->cache.dirlength = val;
    return NULL;
}

static const char *
     set_cache_exclude(cmd_parms *parms, void *dummy, char *arg)
{
    server_rec *s = parms->server;
    proxy_server_conf *conf =
    ap_get_module_config(s->module_config, &proxy_module);
    struct nocache_entry *new;
    struct nocache_entry *list = (struct nocache_entry *) conf->nocaches->elts;
    struct hostent hp;
    int found = 0;
    int i;

    /* Don't duplicate entries */
    for (i = 0; i < conf->nocaches->nelts; i++) {
	if (strcasecmp(arg, list[i].name) == 0) /* ignore case for host names */
	    found = 1;
    }

    if (!found) {
	new = ap_push_array(conf->nocaches);
	new->name = arg;
	/* Don't do name lookups on things that aren't dotted */
	if (strchr(arg, '.') != NULL && ap_proxy_host2addr(new->name, &hp) == NULL)
	    /*@@@FIXME: This copies only the first of (possibly many) IP addrs */
	    memcpy(&new->addr, hp.h_addr, sizeof(struct in_addr));
	else
	    new->addr.s_addr = 0;
    }
    return NULL;
}

static const char *
     set_recv_buffer_size(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    int s = atoi(arg);
    if (s < 512 && s != 0) {
	return "ProxyReceiveBufferSize must be >= 512 bytes, or 0 for system default.";
    }

    psf->recv_buffer_size = s;
    return NULL;
}

static const char*
    set_cache_completion(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);
    int s = atoi(arg);
    if (s > 100 || s < 0) {
	return "CacheForceCompletion must be <= 100 percent, "
               "or 0 for system default.";
    }

    if (s > 0)
      psf->cache.cache_completion = ((float)s / 100);
    return NULL;    
}

static const char*
    set_via_opt(cmd_parms *parms, void *dummy, char *arg)
{
    proxy_server_conf *psf =
    ap_get_module_config(parms->server->module_config, &proxy_module);

    if (strcasecmp(arg, "Off") == 0)
        psf->viaopt = via_off;
    else if (strcasecmp(arg, "On") == 0)
        psf->viaopt = via_on;
    else if (strcasecmp(arg, "Block") == 0)
        psf->viaopt = via_block;
    else if (strcasecmp(arg, "Full") == 0)
        psf->viaopt = via_full;
    else {
	return "ProxyVia must be one of: "
               "off | on | full | block";
    }

    return NULL;    
}

static const handler_rec proxy_handlers[] =
{
    {"proxy-server", proxy_handler},
    {NULL}
};

static const command_rec proxy_cmds[] =
{
    {"ProxyRequests", set_proxy_req, NULL, RSRC_CONF, FLAG,
     "on if the true proxy requests should be accepted"},
    {"ProxyRemote", add_proxy, NULL, RSRC_CONF, TAKE2,
     "a scheme, partial URL or '*' and a proxy server"},
    {"ProxyPass", add_pass, NULL, RSRC_CONF, TAKE2,
     "a virtual path and a URL"},
    {"ProxyPassReverse", add_pass_reverse, NULL, RSRC_CONF, TAKE2,
     "a virtual path and a URL for reverse proxy behaviour"},
    {"ProxyBlock", set_proxy_exclude, NULL, RSRC_CONF, ITERATE,
     "A list of names, hosts or domains to which the proxy will not connect"},
    {"ProxyReceiveBufferSize", set_recv_buffer_size, NULL, RSRC_CONF, TAKE1,
     "Receive buffer size for outgoing HTTP and FTP connections in bytes"},
    {"NoProxy", set_proxy_dirconn, NULL, RSRC_CONF, ITERATE,
     "A list of domains, hosts, or subnets to which the proxy will connect directly"},
    {"ProxyDomain", set_proxy_domain, NULL, RSRC_CONF, TAKE1,
     "The default intranet domain name (in absence of a domain in the URL)"},
    {"AllowCONNECT", set_allowed_ports, NULL, RSRC_CONF, ITERATE,
     "A list of ports which CONNECT may connect to"},
    {"CacheRoot", set_cache_root, NULL, RSRC_CONF, TAKE1,
     "The directory to store cache files"},
    {"CacheSize", set_cache_size, NULL, RSRC_CONF, TAKE1,
     "The maximum disk space used by the cache in Kb"},
    {"CacheMaxExpire", set_cache_maxex, NULL, RSRC_CONF, TAKE1,
     "The maximum time in hours to cache a document"},
    {"CacheDefaultExpire", set_cache_defex, NULL, RSRC_CONF, TAKE1,
     "The default time in hours to cache a document"},
    {"CacheLastModifiedFactor", set_cache_factor, NULL, RSRC_CONF, TAKE1,
     "The factor used to estimate Expires date from LastModified date"},
    {"CacheGcInterval", set_cache_gcint, NULL, RSRC_CONF, TAKE1,
     "The interval between garbage collections, in hours"},
    {"CacheDirLevels", set_cache_dirlevels, NULL, RSRC_CONF, TAKE1,
     "The number of levels of subdirectories in the cache"},
    {"CacheDirLength", set_cache_dirlength, NULL, RSRC_CONF, TAKE1,
     "The number of characters in subdirectory names"},
    {"NoCache", set_cache_exclude, NULL, RSRC_CONF, ITERATE,
     "A list of names, hosts or domains for which caching is *not* provided"},
    {"CacheForceCompletion", set_cache_completion, NULL, RSRC_CONF, TAKE1,
     "Force a http cache completion after this percentage is loaded"},
    {"ProxyVia", set_via_opt, NULL, RSRC_CONF, TAKE1,
     "Configure Via: proxy header header to one of: on | off | block | full"},
    {NULL}
};

module MODULE_VAR_EXPORT proxy_module =
{
    STANDARD_MODULE_STUFF,
    proxy_init,			/* initializer */
    NULL,			/* create per-directory config structure */
    NULL,			/* merge per-directory config structures */
    create_proxy_config,	/* create per-server config structure */
    NULL,			/* merge per-server config structures */
    proxy_cmds,			/* command table */
    proxy_handlers,		/* handlers */
    proxy_trans,		/* translate_handler */
    NULL,			/* check_user_id */
    NULL,			/* check auth */
    NULL,			/* check access */
    NULL,			/* type_checker */
    proxy_fixup,		/* pre-run fixups */
    NULL,			/* logger */
    NULL,			/* header parser */
    NULL,			/* child_init */
    NULL,			/* child_exit */
    proxy_detect		/* post read-request */
};