Linux 网络开发必学课程（十三）课代码

#include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/tcp.h> #include <arpa/inet.h> #include <unistd.h> #include <malloc.h> #include <string.h> #include "udp_point.h" #include "msg_parser.h" typedef struct udp_point { int fd; MParser* parser; void* data; } Point; static char g_temp[1024 * 4] = {0}; static void ParseAddr(struct sockaddr_in addr, char* ip, int* port) { if( ip ) { strcpy(ip, inet_ntoa(addr.sin_addr)); } if( port ) { *port = ntohs(addr.sin_port); } } UdpPoint* UdpPoint_New(int port) { Point* ret = malloc(sizeof(Point)); struct sockaddr_in addr = {0}; int ok = !!ret; addr.sin_family = AF_INET; addr.sin_addr.s_addr = htonl(INADDR_ANY); addr.sin_port = htons(port); ok = ok && ((ret->parser = MParser_New()) != NULL); ok = ok && ((ret->fd = socket(PF_INET, SOCK_DGRAM, 0)) != -1); ok = ok && (bind(ret->fd, (struct sockaddr*)&addr, sizeof(addr)) != -1); if( ok ) { ret->data = NULL; } else { ret ? (MParser_Del(ret->parser), NULL) : NULL; ret ? close(ret->fd) : -1; free(ret); ret = NULL; } return ret; } UdpPoint* UdpPoint_From(int fd) { Point* ret = malloc(sizeof(Point)); if( ret ) { ret->fd = fd; ret->parser = MParser_New(); ret->data = NULL; } return (ret && ret->parser) ? ret : (free(ret), NULL); } int UdpPoint_SendMsg(UdpPoint* point, Message* msg, const char* remote, int port) { int ret = 0; Point* c = (Point*)point; if( c && msg && remote ) { int len = Message_Size(msg); char* data = (char*)Message_H2N(msg); ret = UdpPoint_SendRaw(c, data, len, remote, port); Message_N2H(msg); } return ret; } int UdpPoint_SendRaw(UdpPoint* point, char* buf, int length, const char* remote, int port) { int ret = 0; Point* c = (Point*)point; if( c && buf && remote ) { struct sockaddr_in raddr = {0}; int addrlen = sizeof(raddr); raddr.sin_family = AF_INET; raddr.sin_addr.s_addr = inet_addr(remote); raddr.sin_port = htons(port); ret = (sendto(c->fd, buf, length, 0, (struct sockaddr*)&raddr, addrlen) != -1); } return ret; } Message* UdpPoint_RecvMsg(UdpPoint* point, char* remote, int* port) { Message* ret = NULL; Point* c = (Point*)point; if( c ) { struct sockaddr_in raddr = {0}; int addrlen = sizeof(raddr); int length = recvfrom(c->fd, g_temp, sizeof(g_temp), MSG_PEEK, (struct sockaddr*)&raddr, &addrlen); char* buf = (length > 0) ? malloc(length) : NULL; length = recvfrom(c->fd, buf, length, 0, (struct sockaddr*)&raddr, &addrlen); if( length > 0 ) { ret = MParser_ReadMem(c->parser, buf, length); } if( ret ) { ParseAddr(raddr, remote, port); } free(buf); } return ret; } int UdpPoint_RecvRaw(UdpPoint* point, char* buf, int length, char* remote, int* port) { int ret = 0; Point* c = (Point*)point; if( c && buf ) { struct sockaddr_in raddr = {0}; int addrlen = sizeof(raddr); ret = recvfrom(c->fd, buf, length, 0, (struct sockaddr*)&raddr, &addrlen); if( ret != -1 ) { ParseAddr(raddr, remote, port); } } return ret; } void UdpPoint_Del(UdpPoint* point) { Point* c = (Point*)point; if( c ) { close(c->fd); MParser_Del(c->parser); free(c); } } int UdpPoint_Available(UdpPoint* point) { int ret = -1; Point* c = (Point*)point; if( c ) { struct sockaddr_in raddr = {0}; int len = sizeof(raddr); ret = recvfrom(c->fd, g_temp, sizeof(g_temp), MSG_PEEK | MSG_DONTWAIT, (struct sockaddr*)&raddr, &len); } return ret; } void UdpPoint_SetData(UdpPoint* point, void* data) { Point* c = (Point*)point; if( c ) { c->data = data; } } void* UdpPoint_GetData(UdpPoint* point) { void* ret = NULL; Point* c = (Point*)point; if( c ) { ret = c->data; } return ret; } int UdpPoint_SetOpt(UdpPoint* point, int level, int optname, const void* optval, unsigned int optlen) { int ret = -1; Point* c = (Point*)point; if( c ) { ret = setsockopt(c->fd, level, optname, optval, optlen); } return ret; } int UdpPoint_GetOpt(UdpPoint* point, int level, int optname, void *optval, unsigned int* optlen) { int ret = -1; Point* c = (Point*)point; if( c ) { ret = getsockopt(c->fd, level, optname, optval, optlen); } return ret; }