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Linux下使用socket传输文件的C语言简单实现
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轉載：http://blog.csdn.net/ljd_1986413/article/details/7940938
服務器程序和客戶端程序應當分別運行在兩臺計算機上。
在運行服務器端的計算機終端執行：./file_server
在運行客戶端的計算終端上執行：./file_client?? ipaddr_server
然后根據提示輸入要傳輸的服務器上的文件，該文件必須在服務器的當前運行目錄中，否則會提示找不到文件。
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直接上源碼吧：
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[cpp]?view plaincopy
?? ?? ?? #include<netinet/in.h>??? #include<sys/types.h>??? #include<sys/socket.h>??? #include<stdio.h>??? #include<stdlib.h>??? #include<string.h>??? ?? #define?HELLO_WORLD_SERVER_PORT????6666?? #define?LENGTH_OF_LISTEN_QUEUE?????20?? #define?BUFFER_SIZE????????????????1024?? #define?FILE_NAME_MAX_SIZE?????????512?? ?? int?main(int?argc,?char?**argv)?? {?? ?????? ?????? ????struct?sockaddr_in???server_addr;?? ????bzero(&server_addr,?sizeof(server_addr));?? ????server_addr.sin_family?=?AF_INET;?? ????server_addr.sin_addr.s_addr?=?htons(INADDR_ANY);?? ????server_addr.sin_port?=?htons(HELLO_WORLD_SERVER_PORT);?? ?? ?????? ?????? ????int?server_socket?=?socket(PF_INET,?SOCK_STREAM,?0);?? ????if?(server_socket?<?0)?? ????{?? ????????printf("Create?Socket?Failed!\n");?? ????????exit(1);?? ????}?? ?? ?????? ????if?(bind(server_socket,?(struct?sockaddr*)&server_addr,?sizeof(server_addr)))?? ????{?? ????????printf("Server?Bind?Port:?%d?Failed!\n",?HELLO_WORLD_SERVER_PORT);?? ????????exit(1);?? ????}?? ?? ?????? ????if?(listen(server_socket,?LENGTH_OF_LISTEN_QUEUE))?? ????{?? ????????printf("Server?Listen?Failed!\n");?? ????????exit(1);?? ????}?? ?? ?????? ????while(1)?? ????{?? ?????????? ?????????? ????????struct?sockaddr_in?client_addr;?? ????????socklen_t??????????length?=?sizeof(client_addr);?? ?? ?????????? ?????????? ?????????? ?????????? ?????????? ????????int?new_server_socket?=?accept(server_socket,?(struct?sockaddr*)&client_addr,?&length);?? ????????if?(new_server_socket?<?0)?? ????????{?? ????????????printf("Server?Accept?Failed!\n");?? ????????????break;?? ????????}?? ?? ????????char?buffer[BUFFER_SIZE];?? ????????bzero(buffer,?sizeof(buffer));?? ????????length?=?recv(new_server_socket,?buffer,?BUFFER_SIZE,?0);?? ????????if?(length?<?0)?? ????????{?? ????????????printf("Server?Recieve?Data?Failed!\n");?? ????????????break;?? ????????}?? ?? ????????char?file_name[FILE_NAME_MAX_SIZE?+?1];?? ????????bzero(file_name,?sizeof(file_name));?? ????????strncpy(file_name,?buffer,?? ????????????????strlen(buffer)?>?FILE_NAME_MAX_SIZE???FILE_NAME_MAX_SIZE?:?strlen(buffer));?? ?? ????????FILE?*fp?=?fopen(file_name,?"r");?? ????????if?(fp?==?NULL)?? ????????{?? ????????????printf("File:\t%s?Not?Found!\n",?file_name);?? ????????}?? ????????else?? ????????{?? ????????????bzero(buffer,?BUFFER_SIZE);?? ????????????int?file_block_length?=?0;?? ????????????while(?(file_block_length?=?fread(buffer,?sizeof(char),?BUFFER_SIZE,?fp))?>?0)?? ????????????{?? ????????????????printf("file_block_length?=?%d\n",?file_block_length);?? ?? ?????????????????? ????????????????if?(send(new_server_socket,?buffer,?file_block_length,?0)?<?0)?? ????????????????{?? ????????????????????printf("Send?File:\t%s?Failed!\n",?file_name);?? ????????????????????break;?? ????????????????}?? ?? ????????????????bzero(buffer,?sizeof(buffer));?? ????????????}?? ????????????fclose(fp);?? ????????????printf("File:\t%s?Transfer?Finished!\n",?file_name);?? ????????}?? ?? ????????close(new_server_socket);?? ????}?? ?? ????close(server_socket);?? ?? ????return?0;?? }??
[cpp]?view plain
?copy ?? ?? ?? #include<netinet/in.h>?? #include<sys/types.h>?? #include<sys/socket.h>?? #include<stdio.h>?? #include<stdlib.h>?? #include<string.h>?? ?? #define?HELLO_WORLD_SERVER_PORT????6666?? #define?LENGTH_OF_LISTEN_QUEUE?????20?? #define?BUFFER_SIZE????????????????1024?? #define?FILE_NAME_MAX_SIZE?????????512?? ?? int?main(int?argc,?char?**argv)?? {?? ?????? ?????? ????struct?sockaddr_in???server_addr;?? ????bzero(&server_addr,?sizeof(server_addr));?? ????server_addr.sin_family?=?AF_INET;?? ????server_addr.sin_addr.s_addr?=?htons(INADDR_ANY);?? ????server_addr.sin_port?=?htons(HELLO_WORLD_SERVER_PORT);?? ?? ?????? ?????? ????int?server_socket?=?socket(PF_INET,?SOCK_STREAM,?0);?? ????if?(server_socket?<?0)?? ????{?? ????????printf("Create?Socket?Failed!\n");?? ????????exit(1);?? ????}?? ?? ?????? ????if?(bind(server_socket,?(struct?sockaddr*)&server_addr,?sizeof(server_addr)))?? ????{?? ????????printf("Server?Bind?Port:?%d?Failed!\n",?HELLO_WORLD_SERVER_PORT);?? ????????exit(1);?? ????}?? ?? ?????? ????if?(listen(server_socket,?LENGTH_OF_LISTEN_QUEUE))?? ????{?? ????????printf("Server?Listen?Failed!\n");?? ????????exit(1);?? ????}?? ?? ?????? ????while(1)?? ????{?? ?????????? ?????????? ????????struct?sockaddr_in?client_addr;?? ????????socklen_t??????????length?=?sizeof(client_addr);?? ?? ?????????? ?????????? ?????????? ?????????? ?????????? ????????int?new_server_socket?=?accept(server_socket,?(struct?sockaddr*)&client_addr,?&length);?? ????????if?(new_server_socket?<?0)?? ????????{?? ????????????printf("Server?Accept?Failed!\n");?? ????????????break;?? ????????}?? ?? ????????char?buffer[BUFFER_SIZE];?? ????????bzero(buffer,?sizeof(buffer));?? ????????length?=?recv(new_server_socket,?buffer,?BUFFER_SIZE,?0);?? ????????if?(length?<?0)?? ????????{?? ????????????printf("Server?Recieve?Data?Failed!\n");?? ????????????break;?? ????????}?? ?? ????????char?file_name[FILE_NAME_MAX_SIZE?+?1];?? ????????bzero(file_name,?sizeof(file_name));?? ????????strncpy(file_name,?buffer,?? ????????????????strlen(buffer)?>?FILE_NAME_MAX_SIZE???FILE_NAME_MAX_SIZE?:?strlen(buffer));?? ?? ????????FILE?*fp?=?fopen(file_name,?"r");?? ????????if?(fp?==?NULL)?? ????????{?? ????????????printf("File:\t%s?Not?Found!\n",?file_name);?? ????????}?? ????????else?? ????????{?? ????????????bzero(buffer,?BUFFER_SIZE);?? ????????????int?file_block_length?=?0;?? ????????????while(?(file_block_length?=?fread(buffer,?sizeof(char),?BUFFER_SIZE,?fp))?>?0)?? ????????????{?? ????????????????printf("file_block_length?=?%d\n",?file_block_length);?? ?? ?????????????????? ????????????????if?(send(new_server_socket,?buffer,?file_block_length,?0)?<?0)?? ????????????????{?? ????????????????????printf("Send?File:\t%s?Failed!\n",?file_name);?? ????????????????????break;?? ????????????????}?? ?? ????????????????bzero(buffer,?sizeof(buffer));?? ????????????}?? ????????????fclose(fp);?? ????????????printf("File:\t%s?Transfer?Finished!\n",?file_name);?? ????????}?? ?? ????????close(new_server_socket);?? ????}?? ?? ????close(server_socket);?? ?? ????return?0;?? }??
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[cpp]?view plaincopyprint?
?? ?? ?? #include<netinet/in.h>?????????????????????????//?for?sockaddr_in?? #include<sys/types.h>??????????????????????????//?for?socket?? #include<sys/socket.h>?????????????????????????//?for?socket?? #include<stdio.h>??????????????????????????????//?for?printf?? #include<stdlib.h>?????????????????????????????//?for?exit?? #include<string.h>?????????????????????????????//?for?bzero?? ?? #define?HELLO_WORLD_SERVER_PORT???????6666?? #define?BUFFER_SIZE???????????????????1024?? #define?FILE_NAME_MAX_SIZE????????????512?? ?? int?main(int?argc,?char?**argv)?? {?? ????if?(argc?!=?2)?? ????{?? ????????printf("Usage:?./%s?ServerIPAddress\n",?argv[0]);?? ????????exit(1);?? ????}?? ?? ?????? ????struct?sockaddr_in?client_addr;?? ????bzero(&client_addr,?sizeof(client_addr));?? ????client_addr.sin_family?=?AF_INET;??? ????client_addr.sin_addr.s_addr?=?htons(INADDR_ANY);??? ????client_addr.sin_port?=?htons(0);??? ?? ?????? ????int?client_socket?=?socket(AF_INET,?SOCK_STREAM,?0);?? ????if?(client_socket?<?0)?? ????{?? ????????printf("Create?Socket?Failed!\n");?? ????????exit(1);?? ????}?? ?? ?????? ????if?(bind(client_socket,?(struct?sockaddr*)&client_addr,?sizeof(client_addr)))?? ????{?? ????????printf("Client?Bind?Port?Failed!\n");?? ????????exit(1);?? ????}?? ?? ?????? ????struct?sockaddr_in??server_addr;?? ????bzero(&server_addr,?sizeof(server_addr));?? ????server_addr.sin_family?=?AF_INET;?? ?? ?????? ????if?(inet_aton(argv[1],?&server_addr.sin_addr)?==?0)?? ????{?? ????????printf("Server?IP?Address?Error!\n");?? ????????exit(1);?? ????}?? ?? ????server_addr.sin_port?=?htons(HELLO_WORLD_SERVER_PORT);?? ????socklen_t?server_addr_length?=?sizeof(server_addr);?? ?? ?????? ????if?(connect(client_socket,?(struct?sockaddr*)&server_addr,?server_addr_length)?<?0)?? ????{?? ????????printf("Can?Not?Connect?To?%s!\n",?argv[1]);?? ????????exit(1);?? ????}?? ?? ????char?file_name[FILE_NAME_MAX_SIZE?+?1];?? ????bzero(file_name,?sizeof(file_name));?? ????printf("Please?Input?File?Name?On?Server.\t");?? ????scanf("%s",?file_name);?? ?? ????char?buffer[BUFFER_SIZE];?? ????bzero(buffer,?sizeof(buffer));?? ????strncpy(buffer,?file_name,?strlen(file_name)?>?BUFFER_SIZE???BUFFER_SIZE?:?strlen(file_name));?? ?????? ????send(client_socket,?buffer,?BUFFER_SIZE,?0);?? ?? ????FILE?*fp?=?fopen(file_name,?"w");?? ????if?(fp?==?NULL)?? ????{?? ????????printf("File:\t%s?Can?Not?Open?To?Write!\n",?file_name);?? ????????exit(1);?? ????}?? ?? ?????? ????bzero(buffer,?sizeof(buffer));?? ????int?length?=?0;?? ????while(length?=?recv(client_socket,?buffer,?BUFFER_SIZE,?0))?? ????{?? ????????if?(length?<?0)?? ????????{?? ????????????printf("Recieve?Data?From?Server?%s?Failed!\n",?argv[1]);?? ????????????break;?? ????????}?? ?? ????????int?write_length?=?fwrite(buffer,?sizeof(char),?length,?fp);?? ????????if?(write_length?<?length)?? ????????{?? ????????????printf("File:\t%s?Write?Failed!\n",?file_name);?? ????????????break;?? ????????}?? ????????bzero(buffer,?BUFFER_SIZE);?? ????}?? ?? ????printf("Recieve?File:\t?%s?From?Server[%s]?Finished!\n",?file_name,?argv[1]);?? ?? ?????? ????fclose(fp);?? ????close(client_socket);?? ????return?0;?? ?? }??
客戶端不一定要bind()，服務端一定要bind()，為什么？不然客戶端怎么知道服務器位置(IP+PORT)。 一般客戶端不綁定端口，因為客戶程序經常開關， 由于一些原因(這里我說不清楚，你碰到了自然理解)， 斷開時端口很少立刻釋放(一般要1、2分鐘)。 所以客戶端綁定端口容易出問題。?
注：服務器綁定的是偵聽端口，客戶連接后，? 新分配一個sock和它連接(這個sock的port是不同的，相當于沒有bind的一個端口)? 由于偵聽端口是沒有實際聯接的，所以斷開時不需握手，也就沒有釋放問題了。???(注這段是回答時突然想到的，自我感覺是正確的，大家來批判啊)
創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎
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