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[lib] Translate comments, 72 col.

This commit is contained in:
Matteo Cypriani 2011-03-09 17:42:58 +01:00
parent f33ab91187
commit 3d0300cc60
2 changed files with 146 additions and 100 deletions
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161
libowlps/libowlps.c
View File

@ -13,14 +13,17 @@ BOOL run = TRUE ;
/* Convertit une adresse MAC en octets en une chaîne de caractères. /*
* ¡ Il est nécessaire de libérer manuellement le retour de cette fonction ! * Converts a MAC address from bytes to string.
* /!\ You *must* manually free the returned string /!\
*/ */
char* mac_bytes_to_string(unsigned char *mac_binary) char* mac_bytes_to_string(unsigned char *mac_binary)
{ {
char *ret = malloc(sizeof(char) * 18) ; char *ret = malloc(sizeof(char) * 18) ;
sprintf(ret, "%02x:%02x:%02x:%02x:%02x:%02x", mac_binary[0], mac_binary[1], mac_binary[2], mac_binary[3], mac_binary[4], mac_binary[5]) ; sprintf(ret, "%02x:%02x:%02x:%02x:%02x:%02x",
mac_binary[0], mac_binary[1], mac_binary[2],
mac_binary[3], mac_binary[4], mac_binary[5]) ;
ret[17] = '\0' ; ret[17] = '\0' ;
return ret ; return ret ;
@ -28,10 +31,13 @@ char* mac_bytes_to_string(unsigned char *mac_binary)
/* Convertit un identifiant de canal en son numéro (0 si la fréquence est erronée) */ /*
* Converts a IEEE 802.11 frequency into a channel number.
* Returns 0 if the frequency does not correspond to an official channel.
*/
char frequency_to_channel(unsigned short channel) char frequency_to_channel(unsigned short channel)
{ {
char c = 0 ; // Résultat char c = 0 ; // Result
switch (channel) switch (channel)
{ {
@ -84,7 +90,9 @@ char frequency_to_channel(unsigned short channel)
/* Convertit une date au format struct timeval en une valeur entière en millisecondes, et retourne le résultat */ /*
* Converts a struct timeval date value into milliseconds.
*/
unsigned long long timeval_to_ms(struct timeval d) unsigned long long timeval_to_ms(struct timeval d)
{ {
return d.tv_sec * 1000 + d.tv_usec / 1000 ; return d.tv_sec * 1000 + d.tv_usec / 1000 ;
@ -93,8 +101,8 @@ unsigned long long timeval_to_ms(struct timeval d)
/* /*
* Convertit une date sous forme de valeur entière en millisecondes, * Converts a date value in milliseconds into a struct timeval.
* en une struct timeval, et retourne cette structure. *
struct timeval ms_to_timeval(unsigned long long tms) struct timeval ms_to_timeval(unsigned long long tms)
{ {
struct timeval d ; struct timeval d ;
@ -106,7 +114,9 @@ struct timeval ms_to_timeval(unsigned long long tms)
/* Retourne le temps (en millisecondes) écoulé entre deux dates */ /*
* Returns the time (in milliseconds) between two dates.
*/
unsigned long sub_date(struct timeval sup, struct timeval inf) unsigned long sub_date(struct timeval sup, struct timeval inf)
{ {
unsigned long sub = abs(timeval_to_ms(sup) - timeval_to_ms(inf)) ; unsigned long sub = abs(timeval_to_ms(sup) - timeval_to_ms(inf)) ;
@ -118,7 +128,10 @@ unsigned long sub_date(struct timeval sup, struct timeval inf)
/* Compare deux adresses MAC : retourne TRUE si elles sont égales, FALSE sinon */ /*
* Compares two MAC addresses.
* Returns TRUE if they are identical, FALSE otherwise.
*/
BOOL mac_cmp(unsigned char *mac1, unsigned char *mac2) BOOL mac_cmp(unsigned char *mac1, unsigned char *mac2)
{ {
int i ; int i ;
@ -130,81 +143,92 @@ BOOL mac_cmp(unsigned char *mac1, unsigned char *mac2)
/* Crée une socket d'envoi UDP et retourne son descripteur. /*
* Paramètres : * Creates a UDP transmission socket and returns its descriptor.
* - server_address : l'adresse IP du serveur. * Parameters:
* - server_port : le port d'écoute du serveur. * - server_address: the server IP address.
* - server_description (paramètre résultat) : la structure dans laquelle sera enregistrée la description du serveur. * - server_port: the listening port on the server.
* - client_description (paramètre résultat) : la structure dans laquelle sera enregistrée la description du client. * - server_description (in/out): the structure in which the server
* description will be saved.
* - client_description (in/out): the structure in which the client
* description will be saved.
*/ */
int create_udp_sending_socket(char *server_address, int server_port, struct sockaddr_in *server_description, struct sockaddr_in * client_description) int create_udp_sending_socket(char *server_address, int server_port,
struct sockaddr_in *server_description,
struct sockaddr_in * client_description)
{ {
int sockfd ; // Descripteur de la socket int sockfd ; // Socket descriptor
/* Ceation de la socket UDP */ /* Ceate the UDP socket */
sockfd = socket(AF_INET, SOCK_DGRAM, 0) ; sockfd = socket(AF_INET, SOCK_DGRAM, 0) ;
if (sockfd < 0) if (sockfd < 0)
{ {
perror("Échec de la création de la socket ") ; perror("UDP socket creation failed") ;
return sockfd ; return sockfd ;
} }
/* Remise à zéro et initialisation de la structure du client */ /* Initialise the client structure */
bzero((char *) client_description, sizeof(*client_description)) ; bzero((char *) client_description, sizeof(*client_description)) ;
client_description->sin_family = AF_INET ; // Socket INET client_description->sin_family = AF_INET ; // INET socket
client_description->sin_addr.s_addr = htonl(INADDR_ANY) ; // Toutes les connexions client_description->sin_addr.s_addr = htonl(INADDR_ANY) ;
// client_description->sin_port = htons(0) ; // N'importe quel port (ne sert à rien a priori)
/* Remise à zéro et initialisation de la structure du serveur */ /* Initialise the server structure */
bzero((char *) server_description, sizeof(*server_description)) ; // RÀZ bzero((char *) server_description, sizeof(*server_description)) ;
server_description->sin_family = AF_INET ; // Socket INET server_description->sin_family = AF_INET ; // INET socket
server_description->sin_addr.s_addr = inet_addr(server_address) ; // Adresse du serveur // Server IP address:
server_description->sin_port = htons(server_port) ; // Port d'écoute du serveur server_description->sin_addr.s_addr = inet_addr(server_address) ;
// Listening port on the server:
server_description->sin_port = htons(server_port) ;
return sockfd ; // On retourne le descripteur de la socket créée return sockfd ;
} }
/* Crée une socket d'écoute UDP et retourne son descripteur. /*
* Paramètres : * Creates a UDP reception socket and returns its descriptor.
* - port est le port sur lequel écouter. * Parameters:
* - port: port on which the socket listens.
*/ */
int create_udp_listening_socket(int port) int create_udp_listening_socket(int port)
{ {
int sockfd ; // Descripteur de la socket int sockfd ; // Socket descriptor
struct sockaddr_in server_description ; // Structure du serveur struct sockaddr_in server_description ; // Server structure
int ret = 0 ; // Valeur de retour int ret = 0 ; // Return value
/* Création d'une socket UDP */ /* Create the UDP socket */
sockfd = socket(AF_INET, SOCK_DGRAM, 0) ; sockfd = socket(AF_INET, SOCK_DGRAM, 0) ;
if (sockfd < 0) if (sockfd < 0)
{ {
perror("Échec de la création de la socket ") ; perror("UDP socket creation failed") ;
return sockfd ; return sockfd ;
} }
/* Remise à zéro et initialisation de la structure du serveur */ /* Initialise the server structure */
bzero((char *) &server_description, sizeof(server_description)) ; // RÀZ bzero((char *) &server_description, sizeof(server_description)) ;
server_description.sin_family = AF_INET ; // Socket INET server_description.sin_family = AF_INET ; // INET socket
server_description.sin_addr.s_addr = htonl(INADDR_ANY) ; // Toutes les connexions sont acceptées // All the connections are accepted:
server_description.sin_port = htons(port) ; // Port d'écoute server_description.sin_addr.s_addr = htonl(INADDR_ANY) ;
server_description.sin_port = htons(port) ; // Listening port
/* Réservation du port */ /* Port reservation */
ret = bind(sockfd, (struct sockaddr*) &server_description, sizeof(server_description)) ; ret = bind(sockfd, (struct sockaddr*) &server_description,
sizeof(server_description)) ;
if (ret < 0) if (ret < 0)
{ {
perror("Impossible de créer la socket (bind) ") ; perror("Cannot bind the UDP socket") ;
(void) close(sockfd) ; (void) close(sockfd) ;
return ret ; return ret ;
} }
return sockfd ; // On retourne le descripteur de la socket créée return sockfd ;
} }
/* Bascule l'interface Wi-Fi "iface" en mode Monitor si elle n'y est pas déjà */ /*
* Switches the IEEE 802.11 interface 'iface' to Monitor mode.
*/
int iface_mode_monitor(char *iface) int iface_mode_monitor(char *iface)
{ {
struct iwreq wrq ; struct iwreq wrq ;
@ -236,7 +260,10 @@ int iface_mode_monitor(char *iface)
/* Change le canal de l'interface Wi-Fi "iface" avec la valeur "channel" (numéro de 1 à 14) */ /*
* Sets the IEEE 802.11 channel of the interface 'iface'.
* 'channel' must be an integer between 1 and 14.
*/
int iface_set_channel(char *iface, int channel) int iface_set_channel(char *iface, int channel)
{ {
struct iwreq wrq ; struct iwreq wrq ;
@ -248,7 +275,7 @@ int iface_set_channel(char *iface, int channel)
if (ioctl(sockfd, SIOCSIWFREQ, &wrq) == -1) if (ioctl(sockfd, SIOCSIWFREQ, &wrq) == -1)
{ {
perror("Erreur lors du changement de canal ") ; perror("Error setting the Wi-Fi channel") ;
return ERR_SETTING_CHANNEL ; return ERR_SETTING_CHANNEL ;
} }
@ -259,7 +286,10 @@ int iface_set_channel(char *iface, int channel)
/* Fait varier le canal de l'interface Wi-Fi "iface" entre les canaux 4 et 11 */ /*
* Switches alternatively the Wi-Fi channel of the IEEE 802.11 interface
* 'iface' to 4 or 11.
*/
int iface_channel_hop(char *iface) int iface_channel_hop(char *iface)
{ {
unsigned short channel ; unsigned short channel ;
@ -273,34 +303,40 @@ int iface_channel_hop(char *iface)
perror("Erreur lors de la lecture de la fréquence ") ; perror("Erreur lors de la lecture de la fréquence ") ;
return ERR_READING_CHANNEL ; return ERR_READING_CHANNEL ;
} }
channel = wrq.u.freq.m / 100000 ; // Un peu gruik : il vaudrait mieux utiliser iw_freq2float(), iw_freq_to_channel() et compagnie (cf. /usr/include/{iwlib.h,wireless.h}). // The following is not very clean: we should use iw_freq2float(),
// iw_freq_to_channel() & friends, cf. /usr/include/{iwlib.h,wireless.h}.
channel = wrq.u.freq.m / 100000 ;
if (channel > 1000) // Si la valeur est en Hz, if (channel > 1000) // If the value is in Hz, we convert it to a
channel = frequency_to_channel(channel) ; // on la convertit en numéro de canal (avec notre fonction maison, toujours un peu gruik). channel = frequency_to_channel(channel) ; // channel number
// (with our own function, still not very clean).
close(sockfd) ; close(sockfd) ;
/* Changement de canal */ /* Switch the canal */
if (channel == 4) // Si le canal est déjà à 4, if (channel == 4) // If channel is 4
return iface_set_channel(iface, 11) ; // on le passe à 11 ; return iface_set_channel(iface, 11) ; // switch to 11 ;
else else
return iface_set_channel(iface, 4) ; // sinon on le met à 4. return iface_set_channel(iface, 4) ; // else, set it to 4.
} }
/* Gestionnaire de signal générique pour SIGINT */ /*
* Generic signal handler for SIGINT.
*/
void sigint_handler(int num) void sigint_handler(int num)
{ {
if (num != SIGINT) if (num != SIGINT)
{ {
fprintf(stderr, "Erreur ! Gestionnaire de SIGINT appelé mais le signal n'est pas SIGINT.\n") ; fprintf(stderr, "Error! The SIGINT handler was called but the"
" signal is not SIGINT.\n") ;
exit(ERR_BAD_SIGNAL) ; exit(ERR_BAD_SIGNAL) ;
} }
run = FALSE ; run = FALSE ;
printf("\nSignal reçu : fin du programme.\n"); printf("\nSignal received: end.\n");
fflush(NULL) ; fflush(NULL) ;
} }
@ -311,7 +347,8 @@ void sigterm_handler(int num)
{ {
if (num != SIGTERM) if (num != SIGTERM)
{ {
fprintf(stderr, "Erreur ! Gestionnaire de SIGTERM appelé mais le signal n'est pas SIGINT.\n") ; fprintf(stderr, "Error! The SIGTERM handler was called but the"
" signal is not SIGTERM.\n") ;
exit(ERR_BAD_SIGNAL) ; exit(ERR_BAD_SIGNAL) ;
} }

85
libowlps/owlps.h
View File

@ -51,61 +51,63 @@
#define MOBILE_DEFAULT_PORT 9910 #define MOBILE_DEFAULT_PORT 9910
/* Type booléen */ /* Boolean type */
typedef enum {FALSE, TRUE} BOOL ; typedef enum {FALSE, TRUE} BOOL ;
#define BOOL_TO_STRING(B) ((B) ? "true" : "false") #define BOOL_TO_STRING(B) ((B) ? "true" : "false")
/* Type direction */ /* Direction type */
typedef enum {NORTH = 1, EAST, SOUTH, WEST} DIRECTION ; typedef enum {NORTH = 1, EAST, SOUTH, WEST} DIRECTION ;
/* Message envoyé par l'AP à l'agrégateur */ /* Message sent by the listener to the aggregator */
typedef struct _couple_message typedef struct _couple_message
{ {
unsigned char ap_mac_addr_bytes[6] ; // Adresse MAC de l'AP émetteur de l'info en octets unsigned char ap_mac_addr_bytes[6] ; // MAC of the listener
unsigned char mobile_mac_addr_bytes[6] ; // Adresse MAC du mobile en octets unsigned char mobile_mac_addr_bytes[6] ; // MAC of the mobile involved
unsigned char mobile_ip_addr_bytes[4] ; // Adresse IP du mobile en octets unsigned char mobile_ip_addr_bytes[4] ; // IP of the mobile
struct timeval request_time ; // Identifiant du paquet = date sur le client struct timeval request_time ; // Request ID (timestamp on the mobile)
struct timeval start_time ; // Heure d'arrivée du paquet sur l'AP struct timeval start_time ; // Timestamp of arrival on the listener
unsigned char antenna_signal_dbm ; // Puissance du signal reçu par l'AP du mobile unsigned char antenna_signal_dbm ; // Signal strength measured by the listener
/* Données pour la calibration */ /* Calibration data */
float x_position ; float x_position ;
float y_position ; float y_position ;
float z_position ; float z_position ;
DIRECTION direction ; // Orientation de la demande de localisation DIRECTION direction ;
} couple_message ; } couple_message ;
typedef struct _couple_info typedef struct _couple_info
{ {
unsigned char ap_mac_addr_bytes[6] ; // Adresse MAC de l'AP unsigned char ap_mac_addr_bytes[6] ; // MAC of the listener
unsigned char antenna_signal_dbm ; // Puissance du signal reçu par l'AP unsigned char antenna_signal_dbm ; // Signal strength measured by the listener
} couple_info ; } couple_info ;
typedef struct _request typedef struct _request
{ {
unsigned char mobile_mac_addr_bytes[6]; //Adresse MAC du mobile unsigned char mobile_mac_addr_bytes[6]; // MAC of the mobile
struct timeval request_time; // Date sur le client struct timeval request_time; // Request ID (timestamp on the mobile)
int nb_couples; // Nombre couples (MAC AP;Puissance) int nb_couples; // Number of (listener MAC;signal strength) couples
} request; } request;
/* Hello message sent by the listener to the aggregator */
typedef struct _autocalibration_hello typedef struct _autocalibration_hello
{ {
unsigned char ap_mac_addr_bytes[6]; unsigned char ap_mac_addr_bytes[6];
} autocalibration_hello ; } autocalibration_hello ;
/* Message sent to the listener to order an emission */
typedef struct _autocalibration_order typedef struct _autocalibration_order
{ {
enum {AUTOCALIBRATION_ORDER_SEND = 1} order ; enum {AUTOCALIBRATION_ORDER_SEND = 1} order ;
} autocalibration_order ; } autocalibration_order ;
/* Types de demandes de localisation */ /* Positioning request types */
#define PACKET_TYPE_NORMAL 0 #define PACKET_TYPE_NORMAL 0
#define PACKET_TYPE_CALIBRATION 1 #define PACKET_TYPE_CALIBRATION 1
#define PACKET_TYPE_AUTOCALIBRATION 2 #define PACKET_TYPE_AUTOCALIBRATION 2
/* Fréquences des canaux Wi-Fi en Hz */ /* Wi-Fi channel frequencies in Hz */
#define CHANNEL_1 2412 #define CHANNEL_1 2412
#define CHANNEL_2 2417 #define CHANNEL_2 2417
#define CHANNEL_3 2422 #define CHANNEL_3 2422
@ -122,35 +124,38 @@ typedef struct _autocalibration_order
#define CHANNEL_14 2477 #define CHANNEL_14 2477
/* Taille des en-têtes des paquets (en octets) */ /* Packet header sizes (in bytes) */
#define IEEE80211_HEADER_SIZE_DATA 24 // Header size for a Data frame #define IEEE80211_HEADER_SIZE_DATA 24 // Header size for a Data frame
#define LLC_HEADER_SIZE 8 #define LLC_HEADER_SIZE 8
/* Types des paquets capturés (en-tête IEEE 802.11) */ /* IEEE 802.11 frame types */
// Beacon (TODO: convert to mask) // Beacon (TODO: convert to mask)
#define RAW_PACKET_TYPE_BEACON 0x80 #define RAW_PACKET_TYPE_BEACON 0x80
// Data frame // Data frame
#define FRAME_TYPE_DATA_MASK 0x08 #define FRAME_TYPE_DATA_MASK 0x08
#define IS_DATA_FRAME(FC1) (((FC1) & FRAME_TYPE_DATA_MASK) == FRAME_TYPE_DATA_MASK) #define IS_DATA_FRAME(FC1) \
(((FC1) & FRAME_TYPE_DATA_MASK) == FRAME_TYPE_DATA_MASK)
// QoS Data frame // QoS Data frame
#define FRAME_SUBTYPE_QOS_MASK 0x80 #define FRAME_SUBTYPE_QOS_MASK 0x80
#define DATA_FRAME_IS_QOS(FC1) (((FC1) & FRAME_SUBTYPE_QOS_MASK) == FRAME_SUBTYPE_QOS_MASK) #define DATA_FRAME_IS_QOS(FC1) \
(((FC1) & FRAME_SUBTYPE_QOS_MASK) == FRAME_SUBTYPE_QOS_MASK)
// To/From DS // To/From DS
#define FRAME_FROM_STA_MASK 0x02 #define FRAME_FROM_STA_MASK 0x02
#define IS_FRAME_FROM_STA(FC2) (((FC2) & FRAME_FROM_STA_MASK) != FRAME_FROM_STA_MASK) #define IS_FRAME_FROM_STA(FC2) \
(((FC2) & FRAME_FROM_STA_MASK) != FRAME_FROM_STA_MASK)
/* Position des champs fixes de l'en-tête radiotap (octets) */ /* Positions of the radiotap header fixed fields (in bytes) */
#define RTAP_P_HREVISION 0 // Header revision #define RTAP_P_HREVISION 0 // Header revision
#define RTAP_P_HPAD 1 // Header pad #define RTAP_P_HPAD 1 // Header pad
#define RTAP_P_HLENGTH 2 // Header length #define RTAP_P_HLENGTH 2 // Header length
#define RTAP_P_PRESENTFLAGS 4 // Present flags #define RTAP_P_PRESENTFLAGS 4 // Present flags
/* Longueur des champs de l'en-tête radiotap (octets) */ /* Radiotap field lengths (in bytes) */
#define RTAP_L_HREVISION 1 // Header revision #define RTAP_L_HREVISION 1 // Header revision
#define RTAP_L_HPAD 1 // Header pad #define RTAP_L_HPAD 1 // Header pad
#define RTAP_L_HLENGTH 2 // Header length #define RTAP_L_HLENGTH 2 // Header length
@ -171,15 +176,15 @@ typedef struct _autocalibration_order
#define RTAP_L_ANTENNASIGNALDB 1 // SSI signal (dB) #define RTAP_L_ANTENNASIGNALDB 1 // SSI signal (dB)
#define RTAP_L_ANTENNANOISEDB 1 // SSI noise (dB) #define RTAP_L_ANTENNANOISEDB 1 // SSI noise (dB)
#define RTAP_L_FCS 4 // Frame Check Sequence #define RTAP_L_FCS 4 // Frame Check Sequence
//#define RTAP_L_CHANNELP // Extended channel info (non implémenté) //#define RTAP_L_CHANNELP // Extended channel info (not implemented)
//#define RTAP_L_EXT // Extension aux Present flags (non implémenté) //#define RTAP_L_EXT // Extension aux Present flags (not emplemented)
/* Positions dans Present flags (et tableau 'check' des champs présents) */ /* Positions in 'Present flags' (and present fields 'check' array) */
#define RTAP_MACTS 0 #define RTAP_MACTS 0
#define RTAP_FLAGS 1 #define RTAP_FLAGS 1
#define RTAP_RATE 2 #define RTAP_RATE 2
#define RTAP_CHANNEL 3 // ainsi que RTAP_CHANNELTYPE #define RTAP_CHANNEL 3 // and RTAP_CHANNELTYPE
#define RTAP_FHSS 4 #define RTAP_FHSS 4
#define RTAP_ANTENNASIGNALDBM 5 #define RTAP_ANTENNASIGNALDBM 5
#define RTAP_ANTENNANOISEDBM 6 #define RTAP_ANTENNANOISEDBM 6
@ -195,11 +200,11 @@ typedef struct _autocalibration_order
//#define RTAP_EXT 31 //#define RTAP_EXT 31
/* Variables globales */ /* Global variables */
BOOL run ; BOOL run ;
/* Codes d'erreur des fonctions */ /* Function error codes */
#define ERR_SETTING_MODE 101 #define ERR_SETTING_MODE 101
#define ERR_SETTING_CHANNEL 102 #define ERR_SETTING_CHANNEL 102
#define ERR_READING_CHANNEL 103 #define ERR_READING_CHANNEL 103
@ -207,30 +212,34 @@ BOOL run ;
#define ERR_BAD_SIGNAL 111 #define ERR_BAD_SIGNAL 111
/* En-têtes de fonctions */ /* Function headers */
// Fonctions utilitaires // Tool functions
char* mac_bytes_to_string(unsigned char *mac_binary) ; char* mac_bytes_to_string(unsigned char *mac_binary) ;
char frequency_to_channel(unsigned short channel) ; char frequency_to_channel(unsigned short channel) ;
unsigned long long timeval_to_ms(struct timeval date) ; unsigned long long timeval_to_ms(struct timeval date) ;
unsigned long sub_date(struct timeval sup, struct timeval inf) ; unsigned long sub_date(struct timeval sup, struct timeval inf) ;
BOOL mac_cmp(unsigned char *mac1, unsigned char *mac2) ; BOOL mac_cmp(unsigned char *mac1, unsigned char *mac2) ;
// Réseau // Network
int create_udp_sending_socket(char *server_address, int server_port, struct sockaddr_in *server_description, struct sockaddr_in * client_description) ; int create_udp_sending_socket(char *server_address, int server_port,
struct sockaddr_in *server_description,
struct sockaddr_in * client_description) ;
int create_udp_listening_socket(int port) ; int create_udp_listening_socket(int port) ;
int iface_mode_monitor(char *iface) ; int iface_mode_monitor(char *iface) ;
int iface_set_channel(char *iface, int channel) ; int iface_set_channel(char *iface, int channel) ;
int iface_channel_hop(char *iface) ; int iface_channel_hop(char *iface) ;
// Signaux // Signals
void sigint_handler(int num) ; void sigint_handler(int num) ;
void sigterm_handler(int num) ; void sigterm_handler(int num) ;
/* Macros */ /* Macros */
/* Prend les flags de l'en-tête IEEE 802.11 en paramètre, /*
* retourne 0 si le bit Retry est absent, ou une valeur positive s'il est présent. * Test if a IEEE 802.11 frame is a retry.
* Input: IEEE 802.11 header flags.
* Returns 0 if the Retry bit is absent, a positive value if present.
*/ */
#define IS_RETRY(IEEE80211_FLAGS) ((IEEE80211_FLAGS) & 0x08) #define IS_RETRY(IEEE80211_FLAGS) ((IEEE80211_FLAGS) & 0x08)