在具有有线和无线接口的Linux系统上（例如192.168.1.x和192.168.2.x子网）我想发送一个通过所有可用接口发出的UDP广播（即通过有线接口和无线接口）。
目前我发送到（）到INADDR_BROADCAST，但似乎广播只通过其中一个接口发送（并不总是相同，后续广播可能使用其他接口）。
有没有办法可以发送通过每个接口发送的UDP广播？
答案 0 :(得分：27)
首先，您应该考虑广播过时，特别是INADDR_BROADCAST（255.255.255.255）。您的问题突出了广播不适合的原因之一。它应该与IPv4一起消亡（希望如此）。请注意，IPv6甚至没有广播的概念（而是使用多播）。
INADDR_BROADCAST仅限于本地链接。如今，它只能用于DHCP自动配置，因为在这个时候，客户端还不知道它连接到的网络。
使用单个sendto()，只生成一个数据包，并且传出接口由操作系统的路由表（Linux上的ip route）确定。您不能让一个sendto()生成多个数据包，您必须遍历所有接口，并使用原始套接字或使用setsockopt(..., SOL_SOCKET, SO_BINDTODEVICE, "ethX")将套接字绑定到设备以发送每个数据包绕过操作系统路由表（这需要root权限）。不是一个好的解决方案。
相反，由于INADDR_BROADCAST无论如何都没有路由，你可以通过遍历每个接口并将数据包发送到其广播地址来实现几乎相同的事情。例如，假设您的网络具有255.255.255.0（/ 24）个掩码，则广播地址为 192.168.1.255 且 192.168.2.255 。 sendto()，您就可以完成目标了。
修改已修复有关INADDR_BROADCAST的信息，并使用SO_BINDTODEVICE的相关信息补充答案。
答案 1 :(得分：5)
来自UNIX套接字常见问题解答的Jeremy's solution：
#include <stdio.h>
#ifdef WIN32
# include <windows.h>
# include <winsock.h>
# include <iphlpapi.h>
#else
# include <unistd.h>
# include <stdlib.h>
# include <sys/socket.h>
# include <netdb.h>
# include <netinet/in.h>
# include <net/if.h>
# include <sys/ioctl.h>
#endif
#include <string.h>
#include <sys/stat.h>
typedef unsigned long uint32;
#if defined(__FreeBSD__) || defined(BSD) || defined(__APPLE__) || defined(__linux__)
# define USE_GETIFADDRS 1
# include <ifaddrs.h>
static uint32 SockAddrToUint32(struct sockaddr * a)
{
return ((a)&&(a->sa_family == AF_INET)) ? ntohl(((struct sockaddr_in *)a)->sin_addr.s_addr) : 0;
}
#endif
// convert a numeric IP address into its string representation
static void Inet_NtoA(uint32 addr, char * ipbuf)
{
sprintf(ipbuf, "%li.%li.%li.%li", (addr>>24)&0xFF, (addr>>16)&0xFF, (addr>>8)&0xFF, (addr>>0)&0xFF);
}
// convert a string represenation of an IP address into its numeric equivalent
static uint32 Inet_AtoN(const char * buf)
{
// net_server inexplicably doesn't have this function; so I'll just fake it
uint32 ret = 0;
int shift = 24; // fill out the MSB first
bool startQuad = true;
while((shift >= 0)&&(*buf))
{
if (startQuad)
{
unsigned char quad = (unsigned char) atoi(buf);
ret |= (((uint32)quad) << shift);
shift -= 8;
}
startQuad = (*buf == '.');
buf++;
}
return ret;
}
static void PrintNetworkInterfaceInfos()
{
#if defined(USE_GETIFADDRS)
// BSD-style implementation
struct ifaddrs * ifap;
if (getifaddrs(&ifap) == 0)
{
struct ifaddrs * p = ifap;
while(p)
{
uint32 ifaAddr = SockAddrToUint32(p->ifa_addr);
uint32 maskAddr = SockAddrToUint32(p->ifa_netmask);
uint32 dstAddr = SockAddrToUint32(p->ifa_dstaddr);
if (ifaAddr > 0)
{
char ifaAddrStr[32]; Inet_NtoA(ifaAddr, ifaAddrStr);
char maskAddrStr[32]; Inet_NtoA(maskAddr, maskAddrStr);
char dstAddrStr[32]; Inet_NtoA(dstAddr, dstAddrStr);
printf(" Found interface: name=[%s] desc=[%s] address=[%s] netmask=[%s] broadcastAddr=[%s]\n", p->ifa_name, "unavailable", ifaAddrStr, maskAddrStr, dstAddrStr);
}
p = p->ifa_next;
}
freeifaddrs(ifap);
}
#elif defined(WIN32)
// Windows XP style implementation
// Adapted from example code at http://msdn2.microsoft.com/en-us/library/aa365917.aspx
// Now get Windows' IPv4 addresses table. Once again, we gotta call GetIpAddrTable()
// multiple times in order to deal with potential race conditions properly.
MIB_IPADDRTABLE * ipTable = NULL;
{
ULONG bufLen = 0;
for (int i=0; i<5; i++)
{
DWORD ipRet = GetIpAddrTable(ipTable, &bufLen, false);
if (ipRet == ERROR_INSUFFICIENT_BUFFER)
{
free(ipTable); // in case we had previously allocated it
ipTable = (MIB_IPADDRTABLE *) malloc(bufLen);
}
else if (ipRet == NO_ERROR) break;
else
{
free(ipTable);
ipTable = NULL;
break;
}
}
}
if (ipTable)
{
// Try to get the Adapters-info table, so we can given useful names to the IP
// addresses we are returning. Gotta call GetAdaptersInfo() up to 5 times to handle
// the potential race condition between the size-query call and the get-data call.
// I love a well-designed API :^P
IP_ADAPTER_INFO * pAdapterInfo = NULL;
{
ULONG bufLen = 0;
for (int i=0; i<5; i++)
{
DWORD apRet = GetAdaptersInfo(pAdapterInfo, &bufLen);
if (apRet == ERROR_BUFFER_OVERFLOW)
{
free(pAdapterInfo); // in case we had previously allocated it
pAdapterInfo = (IP_ADAPTER_INFO *) malloc(bufLen);
}
else if (apRet == ERROR_SUCCESS) break;
else
{
free(pAdapterInfo);
pAdapterInfo = NULL;
break;
}
}
}
for (DWORD i=0; i<ipTable->dwNumEntries; i++)
{
const MIB_IPADDRROW & row = ipTable->table[i];
// Now lookup the appropriate adaptor-name in the pAdaptorInfos, if we can find it
const char * name = NULL;
const char * desc = NULL;
if (pAdapterInfo)
{
IP_ADAPTER_INFO * next = pAdapterInfo;
while((next)&&(name==NULL))
{
IP_ADDR_STRING * ipAddr = &next->IpAddressList;
while(ipAddr)
{
if (Inet_AtoN(ipAddr->IpAddress.String) == ntohl(row.dwAddr))
{
name = next->AdapterName;
desc = next->Description;
break;
}
ipAddr = ipAddr->Next;
}
next = next->Next;
}
}
char buf[128];
if (name == NULL)
{
sprintf(buf, "unnamed-%i", i);
name = buf;
}
uint32 ipAddr = ntohl(row.dwAddr);
uint32 netmask = ntohl(row.dwMask);
uint32 baddr = ipAddr & netmask;
if (row.dwBCastAddr) baddr |= ~netmask;
char ifaAddrStr[32]; Inet_NtoA(ipAddr, ifaAddrStr);
char maskAddrStr[32]; Inet_NtoA(netmask, maskAddrStr);
char dstAddrStr[32]; Inet_NtoA(baddr, dstAddrStr);
printf(" Found interface: name=[%s] desc=[%s] address=[%s] netmask=[%s] broadcastAddr=[%s]\n", name, desc?desc:"unavailable", ifaAddrStr, maskAddrStr, dstAddrStr);
}
free(pAdapterInfo);
free(ipTable);
}
#else
// Dunno what we're running on here!
# error "Don't know how to implement PrintNetworkInterfaceInfos() on this OS!"
#endif
}
int main(int, char **)
{
PrintNetworkInterfaceInfos();
return 0;
}
答案 2 :(得分：4)
您不能在每个接口上生成一个sendto()数据包 - 通常（尽管存在碎片），它是为每个sendto()传输的一个数据包。
您需要为每个接口传输一次数据包：
使用低级别（setsockopt()？）调用来选择出站接口
发送到每个已知界面的特定广播地址