如何解决socket编程中的分段错误?
我在linux编码方面有一个问题 当我将文件名发送到服务器时,我得到服务器中的如何解决socket编程中的分段错误?,c,sockets,segmentation-fault,C,Sockets,Segmentation Fault,我在linux编码方面有一个问题 当我将文件名发送到服务器时,我得到服务器中的分段错误 这可能发生在阅读中 但是,我找不到任何解决办法 有什么建议吗 客户端源代码 #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #inclu
分段错误
这可能发生在阅读中
但是,我找不到任何解决办法
有什么建议吗
客户端源代码
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#define BUFMAX 256
void error_handling(const char *msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, h_err;
int file_len = 0;
int buf_size = 0;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[BUFMAX];
FILE *file;
char *file_name;
char *file_cont;
if (argc < 2)
error_handling("ERROR! No simulator provided\n");
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error_handling("ERROR opening socket\n");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
serv_addr.sin_port = htons(5000);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error_handling("ERROR connecting");
// file handling
file_name = (char *)malloc(strlen(argv[1]));
file_len = strlen(argv[1]);
memcpy(file_name, argv[1], file_len);
file = fopen(file_name, "rb");
if(file == NULL)
error_handling("File is not exis!\n");
// send file name
h_err = write(sockfd, file_name, file_len);
if(h_err < 0)
error_handling("ERROR writing to socket!\n");
// file handling
fseek(file, 0, 2);
file_len = ftell(file);
fseek(file, 0, 0);
// send file size
memset(buffer, 0, BUFMAX);
sprintf(buffer, "%d", file_len);
h_err = write(sockfd, buffer, strlen(buffer));
if(h_err < 0)
error_handling("ERROR writing to socket!\n");
file_cont = (char *)malloc(file_len);
while( !feof(file) )
{
fgets(buffer, BUFMAX, file);
memcpy(file_cont + buf_size, buffer, strlen(buffer));
buf_size = strlen(buffer);
}
h_err = send(sockfd, file_cont, file_len, 0);
if(h_err < 0)
error_handling("ERROR sending to socket");
printf("File sending....\n");
fclose(file);
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define BUFMAX 8000
void error_handling(const char *msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, h_err;
int file_len = 0;
char buffer[BUFMAX];
struct sockaddr_in serv_addr, cli_addr;
FILE *file;
char *file_name;
char file_cont[BUFMAX];
socklen_t clilen;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error_handling("ERROR opening socket");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(5000);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error_handling("ERROR on binding");
listen(sockfd, 5);
clilen = sizeof(cli_addr);
while(1)
{
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error_handling("ERROR on accept");
// receive file name
memset(buffer, 0x00, BUFMAX);
h_err = read(newsockfd, buffer, BUFMAX);
if (h_err < 0)
{
close(sockfd);
close(newsockfd);
error_handling("ERROR reading from socket");
}
strcpy(file_name, buffer);
printf("File name = %s\n", file_name);
// receive file size
memset(buffer, 0, BUFMAX);
h_err = read(newsockfd, buffer, BUFMAX);
if (h_err < 0)
{
close(sockfd);
close(newsockfd);
error_handling("ERROR reading from socket");
}
file_len = atoi(buffer);
// file handling
file = fopen(file_name, "wb");
h_err = recv(newsockfd, file_cont, file_len, 0);
if(h_err < 0)
{
close(sockfd);
close(newsockfd);
error_handling("ERROR receive from socket");
}
printf("Recived client file\n");
fwrite(file_cont, 1, file_len, file);
close(newsockfd);
}
fclose(file);
close(sockfd);
return 0;
}
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#定义BUFMAX 256
无效错误处理(const char*msg)
{
FPUT(味精、标准物质);
fputc('\n',stderr);
出口(0);
}
int main(int argc,char*argv[])
{
int sockfd,h_err;
int file_len=0;
int buf_size=0;
服务地址中的结构sockaddr\u;
结构主机*服务器;
字符缓冲区[BUFMAX];
文件*文件;
字符*文件名;
字符*文件内容;
如果(argc<2)
错误处理(“错误!未提供模拟器”);
sockfd=套接字(AF_INET,SOCK_STREAM,0);
if(sockfd<0)
错误处理(“打开套接字时出错”);
memset(&serv_addr,0,sizeof(serv_addr));
serv_addr.sin_family=AF_INET;
serv_addr.sin_addr.s_addr=inet_addr(“127.0.0.1”);
serv_addr.sin_port=htons(5000);
if(connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr))<0)
错误处理(“错误连接”);
//文件处理
文件名=(char*)malloc(strlen(argv[1]);
文件_len=strlen(argv[1]);
memcpy(文件名,argv[1],文件名);
file=fopen(文件名,“rb”);
if(file==NULL)
错误处理(“文件不存在!\n”);
//发送文件名
h_err=write(sockfd,文件名,文件名);
如果(h_误差<0)
错误处理(“写入套接字时出错!\n”);
//文件处理
fseek(文件,0,2);
文件_len=ftell(文件);
fseek(文件,0,0);
//发送文件大小
memset(缓冲区,0,BUFMAX);
sprintf(缓冲区,“%d”,文件长度);
h_err=写入(sockfd,buffer,strlen(buffer));
如果(h_误差<0)
错误处理(“写入套接字时出错!\n”);
file_cont=(char*)malloc(file_len);
而(!feof(文件))
{
fgets(缓冲区、BUFMAX、文件);
memcpy(文件控制+大小、缓冲区、strlen(缓冲区));
buf_size=strlen(缓冲区);
}
h_err=send(sockfd,file_cont,file_len,0);
如果(h_误差<0)
错误处理(“错误发送到套接字”);
printf(“文件发送…”\n);
fclose(文件);
关闭(sockfd);
返回0;
}
服务器源代码
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#define BUFMAX 256
void error_handling(const char *msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, h_err;
int file_len = 0;
int buf_size = 0;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[BUFMAX];
FILE *file;
char *file_name;
char *file_cont;
if (argc < 2)
error_handling("ERROR! No simulator provided\n");
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error_handling("ERROR opening socket\n");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
serv_addr.sin_port = htons(5000);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error_handling("ERROR connecting");
// file handling
file_name = (char *)malloc(strlen(argv[1]));
file_len = strlen(argv[1]);
memcpy(file_name, argv[1], file_len);
file = fopen(file_name, "rb");
if(file == NULL)
error_handling("File is not exis!\n");
// send file name
h_err = write(sockfd, file_name, file_len);
if(h_err < 0)
error_handling("ERROR writing to socket!\n");
// file handling
fseek(file, 0, 2);
file_len = ftell(file);
fseek(file, 0, 0);
// send file size
memset(buffer, 0, BUFMAX);
sprintf(buffer, "%d", file_len);
h_err = write(sockfd, buffer, strlen(buffer));
if(h_err < 0)
error_handling("ERROR writing to socket!\n");
file_cont = (char *)malloc(file_len);
while( !feof(file) )
{
fgets(buffer, BUFMAX, file);
memcpy(file_cont + buf_size, buffer, strlen(buffer));
buf_size = strlen(buffer);
}
h_err = send(sockfd, file_cont, file_len, 0);
if(h_err < 0)
error_handling("ERROR sending to socket");
printf("File sending....\n");
fclose(file);
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define BUFMAX 8000
void error_handling(const char *msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, h_err;
int file_len = 0;
char buffer[BUFMAX];
struct sockaddr_in serv_addr, cli_addr;
FILE *file;
char *file_name;
char file_cont[BUFMAX];
socklen_t clilen;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error_handling("ERROR opening socket");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(5000);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error_handling("ERROR on binding");
listen(sockfd, 5);
clilen = sizeof(cli_addr);
while(1)
{
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error_handling("ERROR on accept");
// receive file name
memset(buffer, 0x00, BUFMAX);
h_err = read(newsockfd, buffer, BUFMAX);
if (h_err < 0)
{
close(sockfd);
close(newsockfd);
error_handling("ERROR reading from socket");
}
strcpy(file_name, buffer);
printf("File name = %s\n", file_name);
// receive file size
memset(buffer, 0, BUFMAX);
h_err = read(newsockfd, buffer, BUFMAX);
if (h_err < 0)
{
close(sockfd);
close(newsockfd);
error_handling("ERROR reading from socket");
}
file_len = atoi(buffer);
// file handling
file = fopen(file_name, "wb");
h_err = recv(newsockfd, file_cont, file_len, 0);
if(h_err < 0)
{
close(sockfd);
close(newsockfd);
error_handling("ERROR receive from socket");
}
printf("Recived client file\n");
fwrite(file_cont, 1, file_len, file);
close(newsockfd);
}
fclose(file);
close(sockfd);
return 0;
}
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#定义BUFMAX 8000
无效错误处理(const char*msg)
{
FPUT(味精、标准物质);
fputc('\n',stderr);
出口(1);
}
int main(int argc,char*argv[])
{
int sockfd、newsockfd、h_err;
int file_len=0;
字符缓冲区[BUFMAX];
服务地址中的结构sockaddr\u,cli\u addr;
文件*文件;
字符*文件名;
字符文件_cont[BUFMAX];
socklen_t clilen;
sockfd=套接字(AF_INET,SOCK_STREAM,0);
if(sockfd<0)
错误处理(“错误打开套接字”);
memset(&serv_addr,0,sizeof(serv_addr));
serv_addr.sin_family=AF_INET;
serv_addr.sin_addr.s_addr=INADDR_ANY;
serv_addr.sin_port=htons(5000);
if(bind(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr))<0)
错误处理(“绑定错误”);
听(sockfd,5);
clilen=sizeof(cli_addr);
而(1)
{
newsockfd=accept(sockfd,(struct sockaddr*)&cli\u addr,&clilen);
if(newsockfd<0)
错误处理(“接受错误”);
//接收文件名
memset(缓冲区,0x00,BUFMAX);
h_err=读取(newsockfd,buffer,BUFMAX);
如果(h_误差<0)
{
关闭(sockfd);
关闭(newsockfd);
错误处理(“从套接字读取错误”);
}
strcpy(文件名、缓冲区);
printf(“文件名=%s\n”,文件名);
//接收文件大小
memset(缓冲区,0,BUFMAX);
h_err=读取(newsockfd,buffer,BUFMAX);
如果(h_误差<0)
{
关闭(sockfd);
关闭(newsockfd);
错误处理(“从套接字读取错误”);
}
file_len=atoi(缓冲区);
//文件处理
文件=fopen(文件名,“wb”);
h_err=recv(newsockfd,文件继续,文件长度,0);
如果(h_误差<0)
{
关闭(sockfd);
关闭(newsockfd);
错误处理(“从套接字接收错误”);
}
printf(“已接收的客户端文件”);
写入(文件继续,1,文件长度,文件);
关闭(newsockfd);
}
fclose(文件);
关闭(sockfd);
返回0;
}
我试图调试您的代码。
我发现您忘记在服务器代码中为var“file\u name”分配内存大小
试着像代码中的下面一行那样分配它
文件名=(char*)malloc(LEN\u文件名)代码>
这个问题可以解决。你可以通过调试代码来解决它……你似乎忘记了C中的字符串实际上比strlen告诉你的多一个字符,你忘记了终止符。我已经在尝试调试了。但是,我不知道为什么read函数读的比我发送的多…而且,TCP套接字是流式的,没有混乱