hostapd的radius/eap server代码分析(2)-hostapd配置

NJZhuJinhua@csdn Apr.10,2010

http://blog.csdn.net/njzhujinhua

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本节将hostapd基本配置及初始化，下节将eap相关的基本配置及初始化

【1】

首先是main函数最开始定义的hapd_interface变量

int main(int argc, char *argv[])

{

struct hapd_interfaces interfaces;

其中hapd_interfaces 定义于hostapd/hostapd.c,该类型仅由main函数使用，

struct hapd_interfaces {

size_t count;

struct hostapd_iface **iface;

};

用于维护所有的interface信息。

对于count个interface分别由hostapd_init进行分配内存及初始化，并紧接着由hostapd_setup_interface进行设置

/* Initialize interfaces */

for (i = 0; i < interfaces.count; i++) {

wpa_printf(MSG_ERROR, "Configuration file: %s",

argv[optind + i]);

interfaces.iface[i] = hostapd_init(argv[optind + i]);

if (!interfaces.iface[i])

goto out;

for (k = 0; k < debug; k++) {

if (interfaces.iface[i]->bss[0]->conf->

logger_stdout_level > 0)

interfaces.iface[i]->bss[0]->conf->

logger_stdout_level--;

}

ret = hostapd_setup_interface(interfaces.iface[i]);

if (ret)

goto out;

for (k = 0; k < (int) interfaces.iface[i]->num_bss; k++) {

if (interfaces.iface[i]->bss[0]->conf->tnc)

tnc++;

}

}

初始化时用该interface对应的配置文件作为参数。

[2] hostapd_iface :定义于hostapd/hostapd.h

定义每个接口拥有的配置信息

/**

* struct hostapd_iface - hostapd per-interface data structure

*/

struct hostapd_iface {

char *config_fname;

struct hostapd_config *conf;

size_t num_bss;

struct hostapd_data **bss;

int num_ap; /* number of entries in ap_list */

struct ap_info *ap_list; /* AP info list head */

struct ap_info *ap_hash[STA_HASH_SIZE];

struct ap_info *ap_iter_list;

struct hostapd_hw_modes *hw_features;

int num_hw_features;

struct hostapd_hw_modes *current_mode;

/* Rates that are currently used (i.e., filtered copy of

* current_mode->channels */

int num_rates;

struct hostapd_rate_data *current_rates;

u16 hw_flags;

/* Number of associated Non-ERP stations (i.e., stations using 802.11b

* in 802.11g BSS) */

int num_sta_non_erp;

/* Number of associated stations that do not support Short Slot Time */

int num_sta_no_short_slot_time;

/* Number of associated stations that do not support Short Preamble */

int num_sta_no_short_preamble;

int olbc; /* Overlapping Legacy BSS Condition */

/* Number of HT associated stations that do not support greenfield */

int num_sta_ht_no_gf;

/* Number of associated non-HT stations */

int num_sta_no_ht;

/* Number of HT associated stations 20 MHz */

int num_sta_ht_20mhz;

/* Overlapping BSS information */

int olbc_ht;

#ifdef CONFIG_IEEE80211N

u16 ht_op_mode;

#endif /* CONFIG_IEEE80211N */

};

看hostapd_init对hostapd_iface进行初始化的代码:

static struct hostapd_iface * hostapd_init(const char *config_file)

{

struct hostapd_iface *hapd_iface = NULL;

struct hostapd_config *conf = NULL;

struct hostapd_data *hapd;

size_t i;

hapd_iface = os_zalloc(sizeof(*hapd_iface));

if (hapd_iface == NULL)

goto fail;

hapd_iface->config_fname = os_strdup(config_file);

if (hapd_iface->config_fname == NULL)

goto fail;

conf = hostapd_config_read(hapd_iface->config_fname);

if (conf == NULL)

goto fail;

hapd_iface->conf = conf;

hapd_iface->num_bss = conf->num_bss;

hapd_iface->bss = os_zalloc(conf->num_bss *

sizeof(struct hostapd_data *));

if (hapd_iface->bss == NULL)

goto fail;

for (i = 0; i < conf->num_bss; i++) {

hapd = hapd_iface->bss[i] =

hostapd_alloc_bss_data(hapd_iface, conf,

&conf->bss[i]);

if (hapd == NULL)

goto fail;

}

return hapd_iface;

fail:

if (conf)

hostapd_config_free(conf);

if (hapd_iface) {

for (i = 0; hapd_iface->bss && i < hapd_iface->num_bss; i++) {

hapd = hapd_iface->bss[i];

if (hapd && hapd->ssl_ctx)

tls_deinit(hapd->ssl_ctx);

}

os_free(hapd_iface->config_fname);

os_free(hapd_iface->bss);

os_free(hapd_iface);

}

return NULL;

}

hostapd_init内以该interface的配置文件作为参数调用hostapd_config_read。并将读取到的配置信息赋给成员变量struct hostapd_config *conf.

根据配置文件中bss的配置个数conf->num_bss的值通过调用hostapd_alloc_bss_data分配空间及相关设置，并对hapd_iface->bss[i]进行赋值，

for (i = 0; i < conf->num_bss; i++) {

hapd = hapd_iface->bss[i] =

hostapd_alloc_bss_data(hapd_iface, conf,

&conf->bss[i]);

if (hapd == NULL)

goto fail;

}

其中hostapd_alloc_bss_data的定义为

static struct hostapd_data *

hostapd_alloc_bss_data(struct hostapd_iface *hapd_iface,

struct hostapd_config *conf,

struct hostapd_bss_config *bss)

{

struct hostapd_data *hapd;

hapd = os_zalloc(sizeof(*hapd));

if (hapd == NULL)

return NULL;

hapd->iconf = conf;

hapd->conf = bss;

hapd->iface = hapd_iface;

if (hapd->conf->individual_wep_key_len > 0) {

/* use key0 in individual key and key1 in broadcast key */

hapd->default_wep_key_idx = 1;

}

// TLS 及 EAP_SERVER 相关代码，此处暂时略

hapd->driver = hapd->iconf->driver;

return hapd;

#if defined(EAP_TLS_FUNCS) || defined(EAP_SERVER)

fail:

#endif /* TODO: cleanup allocated resources(?) */

os_free(hapd);

return NULL;

}

三个参数分别为本interface信息，本interface的配置信息，本interface配置信息中第i个bss的配置部分。

其中代码

hapd->iconf = conf;

hapd->conf = bss;

hapd->iface = hapd_iface;

使得hostapd_data中均有指向这几个配置的指针了。

既有:

hapd_iface->bss[i]->iconf == hapd_iface->conf

hapd_iface->bss[i]->conf == &hapd_iface->conf->bss[i]

hapd_iface->bss[i]->iface == hapd_iface

至此，

struct hostapd_data,

struct hostapd_iface,

struct hostapd_config,

struct hostapd_bss_config

四个基本hostapd配置结构互相指的关系应该搞清楚了吧？