wireless-tools源码分析-iwpriv
2017-02-24 12:19
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iwpriv是Wireless Extensions 操作的特定驱动。通过iwpriv，可以得到AP的一些参数设置，也可以设置自己的WIFI参数。
iwpriv源码中的main函数，内容如下：
使用了
私有数据使用
可以看到使用了
iwpriv的设置通过
[root@root- /]#iwpriv wlan0 Available private ioctls : extscan (8BFA) : set 0 int & get 2 char hostcmd (8BE4) : set 2047 byte & get 2047 byte arpfilter (8BE6) : set 2047 byte & get 2047 byte regrdwr (8BE3) : set 256 char & get 256 char sdcmd52rw (8BFE) : set 7 byte & get 7 byte sdcmd53rw (8BFF) : set 0 char & get 0 char setgetconf (8BEA) : set 2000 byte & get 2000 byte getcis (8BE1) : set 0 & get 512 byte scantype (8BEB) : set 8 char & get 8 char deauth (0001) : set 1 addr & get 0 getNF (0001) : set 1 int & get 1 int getRSSI (0002) : set 1 int & get 1 int bgscan (0004) : set 1 int & get 1 int enable11d (0005) : set 1 int & get 1 int adhocgrate (0006) : set 1 int & get 1 int sdioclock (0007) : set 1 int & get 1 int wmm (0008) : set 1 int & get 1 int uapsdnullgen (000A) : set 1 int & get 1 int setcoalescing (000B) : set 1 int & get 1 int adhocgprot (000C) : set 1 int & get 1 int disable_chsw (000F) : set 1 int & get 1 int setpowercons (0001) : set 1 int & get 1 int wmm_qosinfo (0002) : set 1 int & get 1 int lolisteninter (0003) : set 1 int & get 1 int psnullinterval (0005) : set 1 int & get 1 int bcnmisto (0006) : set 1 int & get 1 int ldocfg (0008) : set 1 int & get 1 int rtsctsctrl (000F) : set 1 int & get 1 int moduletype (000B) : set 1 int & get 1 int autodeepsleep (000C) : set 1 int & get 1 int enhanceps (000D) : set 1 int & get 1 int wakeupmt (000E) : set 1 int & get 1 int setrxant (0001) : set 1 int & get 0 settxant (0002) : set 1 int & get 0 authalgs (0004) : set 1 int & get 0 encryptionmode (0005) : set 1 int & get 0 setregioncode (0006) : set 1 int & get 0 setlisteninter (0007) : set 1 int & get 0 setmultipledtim (0008) : set 1 int & get 0 setbcnavg (0009) : set 1 int & get 0 setdataavg (000A) : set 1 int & get 0 associate (000B) : set 1 int & get 0 getregioncode (0001) : set 0 & get 1 int getlisteninter (0002) : set 0 & get 1 int getmultipledtim (0003) : set 0 & get 1 int gettxrate (0004) : set 0 & get 1 int getbcnavg (0005) : set 0 & get 1 int getdataavg (0006) : set 0 & get 1 int getauthtype (0007) : set 0 & get 1 int getrsnmode (0008) : set 0 & get 1 int act_paircipher (0009) : set 0 & get 1 int act_groupcipher (000A) : set 0 & get 1 int getdtim (000B) : set 0 & get 1 int getrxant (0001) : set 0 & get 12 char gettxant (0002) : set 0 & get 12 char gettsf (0003) : set 0 & get 12 char wpssession (0004) : set 0 & get 12 char deepsleep (8BFB) : set 1 char & get 6 char adhocstop (0004) : set 0 & get 0 radioon (0001) : set 0 & get 0 radiooff (0002) : set 0 & get 0 rmaeskey (0003) : set 0 & get 0 crypto_test (0006) : set 0 & get 0 reasso-on (0007) : set 0 & get 0 reasso-off (0008) : set 0 & get 0 wlanidle-on (0009) : set 0 & get 0 wlanidle-off (000A) : set 0 & get 0 softreset (000C) : set 0 & get 0 sleepparams (0002) : set 64 char & get 64 char requesttpc (0004) : set 64 char & get 64 char powercap (0005) : set 64 char & get 64 char measreq (000C) : set 64 char & get 64 char bca-ts (0003) : set 64 char & get 64 char scanmode (0006) : set 64 char & get 64 char getadhocstatus (0009) : set 64 char & get 64 char setgenie (000A) : set 64 char & get 64 char getgenie (000B) : set 64 char & get 64 char qstatus (000D) : set 64 char & get 64 char ts_status (000E) : set 64 char & get 64 char setaeskey (0001) : set 32 char & get 0 getaeskey (0001) : set 1 int & get 128 char version (0002) : set 1 int & get 128 char verext (0003) : set 1 int & get 128 char setwpaie (8BE0) : set 24 char & get 0 setband (0001) : set 10 char & get 0 setadhocch (0002) : set 10 char & get 0 chanswann (0003) : set 10 char & get 0 getband (0001) : set 0 & get 10 char getadhocch (0002) : set 0 & get 10 char getlog (8BE9) : set 0 & get 512 char tpccfg (0001) : set 16 int & get 16 int scanprobes (0006) : set 16 int & get 16 int ledgpio (0005) : set 16 int & get 16 int sleeppd (0007) : set 16 int & get 16 int rateadapt (0008) : set 16 int & get 16 int getSNR (0009) : set 16 int & get 16 int getrate (000A) : set 16 int & get 16 int getrxinfo (000B) : set 16 int & get 16 int atimwindow (000C) : set 16 int & get 16 int bcninterval (000D) : set 16 int & get 16 int sdiopullctrl (000E) : set 16 int & get 16 int scantime (000F) : set 16 int & get 16 int sysclock (0010) : set 16 int & get 16 int txcontrol (0012) : set 16 int & get 16 int hscfg (0014) : set 16 int & get 16 int hssetpara (0015) : set 16 int & get 16 int inactoext (0016) : set 16 int & get 16 int dbgscfg (0017) : set 16 int & get 16 int drvdbg (0018) : set 16 int & get 16 int drvdelaymax (001A) : set 16 int & get 16 int intfctrl (001B) : set 16 int & get 16 int setquietie (001C) : set 16 int & get 16 int ctspowerctrl (001E) : set 16 int & get 16 int psmode (001F) : set 16 int & get 16 int setuserscan (0001) : set 2000 byte & get 2000 byte getscantable (0002) : set 2000 byte & get 2000 byte setmrvltlv (0003) : set 2000 byte & get 2000 byte getassocrsp (0004) : set 2000 byte & get 2000 byte addts (0005) : set 2000 byte & get 2000 byte delts (0006) : set 2000 byte & get 2000 byte qconfig (0007) : set 2000 byte & get 2000 byte qstats (0008) : set 2000 byte & get 2000 byte txpktstats (000C) : set 2000 byte & get 2000 byte getcfptable (0009) : set 2000 byte & get 2000 byte mefcfg (000A) : set 2000 byte & get 2000 byte getmem (000B) : set 2000 byte & get 2000 byte
iwpriv源码中的main函数，内容如下：
/*------------------------------------------------------------------*/
/*
* The main !
*/
int
main(int argc,
char ** argv)
{
int skfd; /* generic raw socket desc. */
int goterr = 0;
/* Create a channel to the NET kernel. */
if((skfd = iw_sockets_open()) < 0)
{
perror("socket");
return(-1);
}
/* No argument : show the list of all devices + ioctl list */
if(argc == 1)
iw_enum_devices(skfd, &print_priv_info, NULL, 0);
else
/* Special cases take one... */
/* All */
if((!strncmp(argv[1], "-a", 2)) || (!strcmp(argv[1], "--all")))
iw_enum_devices(skfd, &print_priv_all, NULL, 0);
else
/* Help */
if((!strncmp(argv[1], "-h", 2)) || (!strcmp(argv[1], "--help")))
iw_usage();
else
/* Version */
if (!strcmp(argv[1], "-v") || !strcmp(argv[1], "--version"))
goterr = iw_print_version_info("iwpriv");
else
/* The device name must be the first argument */
/* Name only : show for that device only */
if(argc == 2)
print_priv_info(skfd, argv[1], NULL, 0);
else
/* Special cases take two... */
/* All */
if((!strncmp(argv[2], "-a", 2)) ||
(!strcmp(argv[2], "--all")))
print_priv_all(skfd, argv[1], NULL, 0);
else
#if 0
/* Roaming */
if(!strncmp(argv[2], "roam", 4))
goterr = set_roaming(skfd, argv + 3, argc - 3, argv[1]);
else
/* Port type */
if(!strncmp(argv[2], "port", 4))
goterr = port_type(skfd, argv + 3, argc - 3, argv[1]);
else
#endif
/*-------------*/
/* Otherwise, it's a private ioctl */
goterr = set_private(skfd, argv + 2, argc - 2, argv[1]);
/* Close the socket. */
iw_sockets_close(skfd);
return(goterr);
}iw_enum_devices函数类似，调用了
print_priv_info函数做参数。
iw_print_version_info函数，打印出了wireless的版本信息，wireless extension版本信息和接口驱动的版本信息。
print_priv_info函数，打印出通过ioctl获取的无线驱动中的设备具有的私有数据和信息。
print_priv_all函数，打印出通过GET ioctl获取的无线驱动中的设备具有的私有数据和信息。
set_private函数，通过ioctl来设定无线驱动中关于设备的私有配置和数据。
print_priv_info函数，内容如下：
/*------------------------------------------------------------------*/
/*
* Print on the screen in a neat fashion the list of private ioctls
* for the device.
*/
static int
print_priv_info(int skfd,
char * ifname,
char * args[],
int count)
{
int k;
iwprivargs * priv;
int n;
/* Avoid "Unused parameter" warning */
args = args; count = count;
/* Read the private ioctls */
n = iw_get_priv_info(skfd, ifname, &priv);
/* Is there any ? */
if(n <= 0)
{
/* Should I skip this message ? */
fprintf(stderr, "%-8.16s no private ioctls.\n\n",
ifname);
}
else
{
printf("%-8.16s Available private ioctls :\n", ifname);
/* Print them all */
for(k = 0; k < n; k++)
if(priv[k].name[0] != '\0')
printf(" %-16.16s (%.4X) : set %3d %s & get %3d %s\n",
priv[k].name, priv[k].cmd,
priv[k].set_args & IW_PRIV_SIZE_MASK,
argtype[(priv[k].set_args & IW_PRIV_TYPE_MASK) >> 12],
priv[k].get_args & IW_PRIV_SIZE_MASK,
argtype[(priv[k].get_args & IW_PRIV_TYPE_MASK) >> 12]);
printf("\n");
}
/* Cleanup */
if(priv)
free(priv);
return(0);
}使用了
iw_get_priv_info函数获取数据然后打印输出。
iw_get_priv_info函数内容如下：
/*------------------------------------------------------------------*/
/*
* Get information about what private ioctls are supported by the driver
*
* Note : there is one danger using this function. If it return 0, you
* still need to free() the buffer. Beware.
*/
int
iw_get_priv_info(int skfd,
const char * ifname,
iwprivargs ** ppriv)
{
struct iwreq wrq;
iwprivargs * priv = NULL; /* Not allocated yet */
int maxpriv = 16; /* Minimum for compatibility WE<13 */
iwprivargs * newpriv;
/* Some driver may return a very large number of ioctls. Some
* others a very small number. We now use a dynamic allocation
* of the array to satisfy everybody. Of course, as we don't know
* in advance the size of the array, we try various increasing
* sizes. Jean II */
do
{
/* (Re)allocate the buffer */
newpriv = realloc(priv, maxpriv * sizeof(priv[0]));
if(newpriv == NULL)
{
fprintf(stderr, "%s: Allocation failed\n", __FUNCTION__);
break;
}
priv = newpriv;
/* Ask the driver if it's large enough */
wrq.u.data.pointer = (caddr_t) priv;
wrq.u.data.length = maxpriv;
wrq.u.data.flags = 0;
if(iw_get_ext(skfd, ifname, SIOCGIWPRIV, &wrq) >= 0)
{
/* Success. Pass the buffer by pointer */
*ppriv = priv;
/* Return the number of ioctls */
return(wrq.u.data.length);
}
/* Only E2BIG means the buffer was too small, abort on other errors */
if(errno != E2BIG)
{
/* Most likely "not supported". Don't barf. */
break;
}
/* Failed. We probably need a bigger buffer. Check if the kernel
* gave us any hints. */
if(wrq.u.data.length > maxpriv)
maxpriv = wrq.u.data.length;
else
maxpriv *= 2;
}
while(maxpriv < 1000);
/* Cleanup */
if(priv)
free(priv);
*ppriv = NULL;
return(-1);
}私有数据使用
iwprivargs结构体，通过
iw_get_ext函数和参数
SIOCGIWPRIV和wrq，进行ioctl操作，获取私有数据。
iwprivargs是定义的
iw_priv_args结构体，定义如下：
/*
* Private ioctl interface information
*/
struct iw_priv_args
{
__u32 cmd; /* Number of the ioctl to issue */
__u16 set_args; /* Type and number of args */
__u16 get_args; /* Type and number of args */
char name[IFNAMSIZ]; /* Name of the extension */
};iw_print_version_info函数内容如下;
/*------------------------------------------------------------------*/
/*
* Print the WE versions of the tools.
*/
int
iw_print_version_info(const char * toolname)
{
int skfd; /* generic raw socket desc. */
int we_kernel_version;
/* Create a channel to the NET kernel. */
if((skfd = iw_sockets_open()) < 0)
{
perror("socket");
return -1;
}
/* Information about the tools themselves */
if(toolname != NULL)
printf("%-8.16s Wireless-Tools version %d\n", toolname, WT_VERSION);
printf(" Compatible with Wireless Extension v11 to v%d.\n\n",
WE_MAX_VERSION);
/* Get version from kernel */
we_kernel_version = iw_get_kernel_we_version();
/* Only version >= 16 can be verified, other are guessed */
if(we_kernel_version > 15)
printf("Kernel Currently compiled with Wireless Extension v%d.\n\n",
we_kernel_version);
/* Version for each device */
iw_enum_devices(skfd, &print_iface_version_info, NULL, 0);
iw_sockets_close(skfd);
return 0;
}可以看到使用了
print_iface_version_info函数来获取无线驱动接口的版本信息，内容如下：
/*------------------------------------------------------------------*/
/*
* Print the WE versions of the interface.
*/
static int
print_iface_version_info(int skfd,
char * ifname,
char * args[], /* Command line args */
int count) /* Args count */
{
struct iwreq wrq;
char buffer[sizeof(iwrange) * 2]; /* Large enough */
struct iw_range * range;
/* Avoid "Unused parameter" warning */
args = args; count = count;
/* If no wireless name : no wireless extensions.
* This enable us to treat the SIOCGIWRANGE failure below properly. */
if(iw_get_ext(skfd, ifname, SIOCGIWNAME, &wrq) < 0)
return(-1);
/* Cleanup */
memset(buffer, 0, sizeof(buffer));
wrq.u.data.pointer = (caddr_t) buffer;
wrq.u.data.length = sizeof(buffer);
wrq.u.data.flags = 0;
if(iw_get_ext(skfd, ifname, SIOCGIWRANGE, &wrq) < 0)
{
/* Interface support WE (see above), but not IWRANGE */
fprintf(stderr, "%-8.16s Driver has no Wireless Extension version information.\n\n", ifname);
return(0);
}
/* Copy stuff at the right place, ignore extra */
range = (struct iw_range *) buffer;
/* For new versions, we can check the version directly, for old versions
* we use magic. 300 bytes is a also magic number, don't touch... */
if(wrq.u.data.length >= 300)
{
/* Version is always at the same offset, so it's ok */
printf("%-8.16s Recommend Wireless Extension v%d or later,\n",
ifname, range->we_version_source);
printf(" Currently compiled with Wireless Extension v%d.\n\n",
range->we_version_compiled);
}
else
{
fprintf(stderr, "%-8.16s Wireless Extension version too old.\n\n",
ifname);
}
return(0);
}print_priv_all函数的内容如下：
/*------------------------------------------------------------------*/
/*
* Print on the screen in a neat fashion the list of private GET ioctl
* data for the device and data returned by those.
*/
static int
print_priv_all(int skfd,
char * ifname,
char * args[],
int count)
{
int k;
iwprivargs * priv;
int n;
/* Avoid "Unused parameter" warning */
args = args; count = count;
/* Read the private ioctls */
n = iw_get_priv_info(skfd, ifname, &priv);
/* Is there any ? */
if(n <= 0)
{
/* Should I skip this message ? */
fprintf(stderr, "%-8.16s no private ioctls.\n\n",
ifname);
}
else
{
printf("%-8.16s Available read-only private ioctl :\n", ifname);
/* Print them all */
for(k = 0; k < n; k++)
/* We call all ioctls that don't have a null name, don't require
* args and return some (avoid triggering "reset" commands) */
if((priv[k].name[0] != '\0') && (priv[k].set_args == 0) &&
(priv[k].get_args != 0))
set_private_cmd(skfd, NULL, 0, ifname, priv[k].name,
priv, n);
printf("\n");
}
/* Cleanup */
if(priv)
free(priv);
return(0);
}print_priv_all函数与
print_priv_info的不同之处是调用了
set_private_cmd函数对接口执行了一个私有的获取命令，内容如下：
/*------------------------------------------------------------------*/
/*
* Execute a private command on the interface
*/
static int
set_private_cmd(int skfd, /* Socket */
char * args[], /* Command line args */
int count, /* Args count */
char * ifname, /* Dev name */
char * cmdname, /* Command name */
iwprivargs * priv, /* Private ioctl description */
int priv_num) /* Number of descriptions */
{
struct iwreq wrq;
u_char buffer[4096]; /* Only that big in v25 and later */
int i = 0; /* Start with first command arg */
int k; /* Index in private description table */
int temp;
int subcmd = 0; /* sub-ioctl index */
int offset = 0; /* Space for sub-ioctl index */
/* Check if we have a token index.
* Do it now so that sub-ioctl takes precedence, and so that we
* don't have to bother with it later on... */
if((count >= 1) && (sscanf(args[0], "[%i]", &temp) == 1))
{
subcmd = temp;
args++;
count--;
}
/* Search the correct ioctl */
k = -1;
while((++k < priv_num) && strcmp(priv[k].name, cmdname));
/* If not found... */
if(k == priv_num)
{
fprintf(stderr, "Invalid command : %s\n", cmdname);
return(-1);
}
/* Watch out for sub-ioctls ! */
if(priv[k].cmd < SIOCDEVPRIVATE)
{
int j = -1;
/* Find the matching *real* ioctl */
while((++j < priv_num) && ((priv[j].name[0] != '\0') ||
(priv[j].set_args != priv[k].set_args) ||
(priv[j].get_args != priv[k].get_args)));
/* If not found... */
if(j == priv_num)
{
fprintf(stderr, "Invalid private ioctl definition for : %s\n",
cmdname);
return(-1);
}
/* Save sub-ioctl number */
subcmd = priv[k].cmd;
/* Reserve one int (simplify alignment issues) */
offset = sizeof(__u32);
/* Use real ioctl definition from now on */
k = j;
#if 0
printf("<mapping sub-ioctl %s to cmd 0x%X-%d>\n", cmdname,
priv[k].cmd, subcmd);
#endif
}
/* If we have to set some data */
if((priv[k].set_args & IW_PRIV_TYPE_MASK) &&
(priv[k].set_args & IW_PRIV_SIZE_MASK))
{
switch(priv[k].set_args & IW_PRIV_TYPE_MASK)
{
case IW_PRIV_TYPE_BYTE:
/* Number of args to fetch */
wrq.u.data.length = count;
if(wrq.u.data.length > (priv[k].set_args & IW_PRIV_SIZE_MASK))
wrq.u.data.length = priv[k].set_args & IW_PRIV_SIZE_MASK;
/* Fetch args */
for(; i < wrq.u.data.length; i++) {
sscanf(args[i], "%i", &temp);
buffer[i] = (char) temp;
}
break;
case IW_PRIV_TYPE_INT:
/* Number of args to fetch */
wrq.u.data.length = count;
if(wrq.u.data.length > (priv[k].set_args & IW_PRIV_SIZE_MASK))
wrq.u.data.length = priv[k].set_args & IW_PRIV_SIZE_MASK;
/* Fetch args */
for(; i < wrq.u.data.length; i++) {
sscanf(args[i], "%i", &temp);
((__s32 *) buffer)[i] = (__s32) temp;
}
break;
case IW_PRIV_TYPE_CHAR:
if(i < count)
{
/* Size of the string to fetch */
wrq.u.data.length = strlen(args[i]) + 1;
if(wrq.u.data.length > (priv[k].set_args & IW_PRIV_SIZE_MASK))
wrq.u.data.length = priv[k].set_args & IW_PRIV_SIZE_MASK;
/* Fetch string */
memcpy(buffer, args[i], wrq.u.data.length);
buffer[sizeof(buffer) - 1] = '\0';
i++;
}
else
{
wrq.u.data.length = 1;
buffer[0] = '\0';
}
break;
case IW_PRIV_TYPE_FLOAT:
/* Number of args to fetch */
wrq.u.data.length = count;
if(wrq.u.data.length > (priv[k].set_args & IW_PRIV_SIZE_MASK))
wrq.u.data.length = priv[k].set_args & IW_PRIV_SIZE_MASK;
/* Fetch args */
for(; i < wrq.u.data.length; i++) {
double freq;
if(sscanf(args[i], "%lg", &(freq)) != 1)
{
printf("Invalid float [%s]...\n", args[i]);
return(-1);
}
if(strchr(args[i], 'G')) freq *= GIGA;
if(strchr(args[i], 'M')) freq *= MEGA;
if(strchr(args[i], 'k')) freq *= KILO;
sscanf(args[i], "%i", &temp);
iw_float2freq(freq, ((struct iw_freq *) buffer) + i);
}
break;
case IW_PRIV_TYPE_ADDR:
/* Number of args to fetch */
wrq.u.data.length = count;
if(wrq.u.data.length > (priv[k].set_args & IW_PRIV_SIZE_MASK))
wrq.u.data.length = priv[k].set_args & IW_PRIV_SIZE_MASK;
/* Fetch args */
for(; i < wrq.u.data.length; i++) {
if(iw_in_addr(skfd, ifname, args[i],
((struct sockaddr *) buffer) + i) < 0)
{
printf("Invalid address [%s]...\n", args[i]);
return(-1);
}
}
break;
default:
fprintf(stderr, "Not implemented...\n");
return(-1);
}
if((priv[k].set_args & IW_PRIV_SIZE_FIXED) &&
(wrq.u.data.length != (priv[k].set_args & IW_PRIV_SIZE_MASK)))
{
printf("The command %s needs exactly %d argument(s)...\n",
cmdname, priv[k].set_args & IW_PRIV_SIZE_MASK);
return(-1);
}
} /* if args to set */
else
{
wrq.u.data.length = 0L;
}
strncpy(wrq.ifr_name, ifname, IFNAMSIZ);
/* Those two tests are important. They define how the driver
* will have to handle the data */
if((priv[k].set_args & IW_PRIV_SIZE_FIXED) &&
((iw_get_priv_size(priv[k].set_args) + offset) <= IFNAMSIZ))
{
/* First case : all SET args fit within wrq */
if(offset)
wrq.u.mode = subcmd;
memcpy(wrq.u.name + offset, buffer, IFNAMSIZ - offset);
}
else
{
if((priv[k].set_args == 0) &&
(priv[k].get_args & IW_PRIV_SIZE_FIXED) &&
(iw_get_priv_size(priv[k].get_args) <= IFNAMSIZ))
{
/* Second case : no SET args, GET args fit within wrq */
if(offset)
wrq.u.mode = subcmd;
}
else
{
/* Third case : args won't fit in wrq, or variable number of args */
wrq.u.data.pointer = (caddr_t) buffer;
wrq.u.data.flags = subcmd;
}
}
/* Perform the private ioctl */
if(ioctl(skfd, priv[k].cmd, &wrq) < 0)
{
fprintf(stderr, "Interface doesn't accept private ioctl...\n");
fprintf(stderr, "%s (%X): %s\n", cmdname, priv[k].cmd, strerror(errno));
return(-1);
}
/* If we have to get some data */
if((priv[k].get_args & IW_PRIV_TYPE_MASK) &&
(priv[k].get_args & IW_PRIV_SIZE_MASK))
{
int j;
int n = 0; /* number of args */
printf("%-8.16s %s:", ifname, cmdname);
/* Check where is the returned data */
if((priv[k].get_args & IW_PRIV_SIZE_FIXED) &&
(iw_get_priv_size(priv[k].get_args) <= IFNAMSIZ))
{
memcpy(buffer, wrq.u.name, IFNAMSIZ);
n = priv[k].get_args & IW_PRIV_SIZE_MASK;
}
else
n = wrq.u.data.length;
switch(priv[k].get_args & IW_PRIV_TYPE_MASK)
{
case IW_PRIV_TYPE_BYTE:
/* Display args */
for(j = 0; j < n; j++)
printf("%d ", buffer[j]);
printf("\n");
break;
case IW_PRIV_TYPE_INT:
/* Display args */
for(j = 0; j < n; j++)
printf("%d ", ((__s32 *) buffer)[j]);
printf("\n");
break;
case IW_PRIV_TYPE_CHAR:
/* Display args */
buffer
= '\0';
printf("%s\n", buffer);
break;
case IW_PRIV_TYPE_FLOAT:
{
double freq;
/* Display args */
for(j = 0; j < n; j++)
{
freq = iw_freq2float(((struct iw_freq *) buffer) + j);
if(freq >= GIGA)
printf("%gG ", freq / GIGA);
else
if(freq >= MEGA)
printf("%gM ", freq / MEGA);
else
printf("%gk ", freq / KILO);
}
printf("\n");
}
break;
case IW_PRIV_TYPE_ADDR:
{
char scratch[128];
struct sockaddr * hwa;
/* Display args */
for(j = 0; j < n; j++)
{
hwa = ((struct sockaddr *) buffer) + j;
if(j)
printf(" %.*s",
(int) strlen(cmdname), " ");
printf("%s\n", iw_saether_ntop(hwa, scratch));
}
}
break;
default:
fprintf(stderr, "Not yet implemented...\n");
return(-1);
}
} /* if args to set */
return(0);
}iwpriv的设置通过
set_private函数来实现，该函数的内容如下：
/*------------------------------------------------------------------*/
/*
* Execute a private command on the interface
*/
static inline int
set_private(int skfd, /* Socket */
char * args[], /* Command line args */
int count, /* Args count */
char * ifname) /* Dev name */
{
iwprivargs * priv;
int number; /* Max of private ioctl */
int ret;
/* Read the private ioctls */
number = iw_get_priv_info(skfd, ifname, &priv);
/* Is there any ? */
if(number <= 0)
{
/* Should I skip this message ? */
fprintf(stderr, "%-8.16s no private ioctls.\n\n",
ifname);
if(priv)
free(priv);
return(-1);
}
/* Do it */
ret = set_private_cmd(skfd, args + 1, count - 1, ifname, args[0],
priv, number);
free(priv);
return(ret);
}set_private函数也是调用了
set_private_cmd函数来执行ioctl的修改了无线设备驱动的私有配置数据。
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