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incp.c
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incp.c
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#if defined(_WIN32)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <io.h>
#include <iphlpapi.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "Ws2_32.lib")
typedef ptrdiff_t ssize_t;
typedef SOCKET OS_SOCKET;
#define OS_INVALID_SOCKET INVALID_SOCKET
#define OS_STAT _stat64
#else /* Unix */
#include <netdb.h>
#include <sys/socket.h>
#include <unistd.h>
typedef int OS_SOCKET;
#define OS_INVALID_SOCKET (-1)
#define OS_STAT stat
#endif
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define DEFAULT_PORT "4627"
#define BACKLOG 10
#define BUFFER_SIZE 8192
#define CRLF "\r\n"
#define INCP_MSG_HELLO "HELLO"
#define INCP_MSG_OK "OK"
#define FILEINFO_IRUSR (1 << 0) /* Read by owner. */
#define FILEINFO_IWUSR (1 << 1) /* Write by owner. */
#define FILEINFO_IXUSR (1 << 2) /* Execute by owner. */
#define FILEINFO_IRGRP (1 << 3) /* Read by group. */
#define FILEINFO_IWGRP (1 << 4) /* Write by group. */
#define FILEINFO_IXGRP (1 << 5) /* Execute by group. */
#define FILEINFO_IROTH (1 << 6) /* Read by others. */
#define FILEINFO_IWOTH (1 << 7) /* Write by others. */
#define FILEINFO_IXOTH (1 << 8) /* Execute by others. */
#define FILEINFO_ISDIR (1 << 9) /* Directory. */
#define FILEINFO_ISREG (1 << 10) /* Regular file. */
#define FILEINFO_ISLNK (1 << 11) /* Symbolic link. */
static void print_usage(void)
{
puts("USAGE:");
puts("\tincp -l [port]");
puts("\tincp source [source...] address[:port]:target");
}
typedef struct FileInfo {
int32_t mode;
unsigned long long size;
char name[1024];
} FileInfo;
/**
* Given a string that has different file properties separated by a space,
* return the info as a struct. The file info string is similar in output to 'ls
* -l'. The columns are file type/permissions, size (in bytes), and then name.
*
* Example file info string:
* 'drwxr-xr-x 4627 FileName.txt'
*
* Returns 0 on success or -1 if not given a valid file info string.
*/
static int fileinfo_parse(FileInfo *finfo, char *fileinfo)
{
char *str = fileinfo;
const char delim = ' ';
char *prop_end = strchr(str, delim);
if (prop_end == NULL) {
return -1;
}
prop_end[0] = '\0';
/* Parse mode. */
finfo->mode = 0;
size_t prop_len = strlen(str);
if (prop_len < 10) {
return -1;
}
if (str[0] != 'd' && str[0] != '-') {
return -1;
}
if (str[0] == 'd') {
finfo->mode = FILEINFO_ISDIR;
} else {
finfo->mode = FILEINFO_ISREG;
}
if (str[1] == 'r')
finfo->mode |= FILEINFO_IRUSR;
if (str[2] == 'w')
finfo->mode |= FILEINFO_IWUSR;
if (str[3] == 'x')
finfo->mode |= FILEINFO_IXUSR;
if (str[4] == 'r')
finfo->mode |= FILEINFO_IRGRP;
if (str[5] == 'w')
finfo->mode |= FILEINFO_IWGRP;
if (str[6] == 'x')
finfo->mode |= FILEINFO_IXGRP;
if (str[7] == 'r')
finfo->mode |= FILEINFO_IROTH;
if (str[8] == 'w')
finfo->mode |= FILEINFO_IWOTH;
if (str[9] == 'x')
finfo->mode |= FILEINFO_IXOTH;
str = prop_end + 1;
prop_end = strchr(str, delim);
if (prop_end == NULL) {
return -1;
}
prop_end[0] = '\0';
/* Parse size. */
errno = 0;
finfo->size = strtoull(str, NULL, 10);
if (finfo->size == ULLONG_MAX && errno == ERANGE) {
return -1;
}
/* Parse name. */
str = prop_end + 1;
size_t len = strlen(str);
if (len >= (sizeof(finfo->name) - 1)) {
return -1;
}
strcpy(finfo->name, str);
return 0;
}
static int fileinfo_snprint(const FileInfo *finfo, char *str, size_t n)
{
char modestr[11];
modestr[0] = finfo->mode & FILEINFO_ISDIR ? 'd' : '-';
modestr[1] = finfo->mode & FILEINFO_IRUSR ? 'r' : '-';
modestr[2] = finfo->mode & FILEINFO_IWUSR ? 'w' : '-';
modestr[3] = finfo->mode & FILEINFO_IXUSR ? 'x' : '-';
modestr[4] = finfo->mode & FILEINFO_IRGRP ? 'r' : '-';
modestr[5] = finfo->mode & FILEINFO_IWGRP ? 'w' : '-';
modestr[6] = finfo->mode & FILEINFO_IXGRP ? 'x' : '-';
modestr[7] = finfo->mode & FILEINFO_IROTH ? 'r' : '-';
modestr[8] = finfo->mode & FILEINFO_IWOTH ? 'w' : '-';
modestr[9] = finfo->mode & FILEINFO_IXOTH ? 'x' : '-';
modestr[10] = '\0';
return snprintf(str, n, "%s %llu %s", modestr, finfo->size, finfo->name);
}
/**
* Copy file permissions from file info to the file at path.
*
* On success, zero is returned. On error, -1 is returned and errno is set
* appropriately.
*/
static int fileinfo_cpyperm(const FileInfo *finfo, char *path)
{
#if defined(_WIN32)
unsigned short perms = 0;
if (finfo->mode & FILEINFO_IRUSR)
perms |= S_IREAD;
if (finfo->mode & FILEINFO_IWUSR)
perms |= S_IWRITE;
if (finfo->mode & FILEINFO_IXUSR)
perms |= S_IEXEC;
return _chmod(path, perms);
#else
mode_t perms = 0;
if (finfo->mode & FILEINFO_IRUSR)
perms |= S_IRUSR;
if (finfo->mode & FILEINFO_IWUSR)
perms |= S_IWUSR;
if (finfo->mode & FILEINFO_IXUSR)
perms |= S_IXUSR;
if (finfo->mode & FILEINFO_IRGRP)
perms |= S_IRGRP;
if (finfo->mode & FILEINFO_IWGRP)
perms |= S_IWGRP;
if (finfo->mode & FILEINFO_IXGRP)
perms |= S_IXGRP;
if (finfo->mode & FILEINFO_IROTH)
perms |= S_IROTH;
if (finfo->mode & FILEINFO_IWOTH)
perms |= S_IWOTH;
if (finfo->mode & FILEINFO_IXOTH)
perms |= S_IXOTH;
return chmod(path, perms);
#endif
}
/**
* Copy permissions from a stat structure to file info structure.
*/
static void fileinfo_setperm(FileInfo *finfo, const struct OS_STAT *s)
{
finfo->mode = 0;
if ((s->st_mode & S_IFMT) == S_IFDIR)
finfo->mode |= FILEINFO_ISDIR;
if ((s->st_mode & S_IFMT) == S_IFREG)
finfo->mode |= FILEINFO_ISREG;
#if defined(_WIN32)
unsigned short perms = s->st_mode & ~S_IFMT;
if (perms & S_IREAD)
finfo->mode |= FILEINFO_IRUSR;
if (perms & S_IWRITE)
finfo->mode |= FILEINFO_IWUSR;
if (perms & S_IEXEC)
finfo->mode |= FILEINFO_IXUSR;
#else
mode_t perms = s->st_mode & ~S_IFMT;
if (perms & S_IRUSR)
finfo->mode |= FILEINFO_IRUSR;
if (perms & S_IWUSR)
finfo->mode |= FILEINFO_IWUSR;
if (perms & S_IXUSR)
finfo->mode |= FILEINFO_IXUSR;
if (perms & S_IRGRP)
finfo->mode |= FILEINFO_IRGRP;
if (perms & S_IWGRP)
finfo->mode |= FILEINFO_IWGRP;
if (perms & S_IXGRP)
finfo->mode |= FILEINFO_IXGRP;
if (perms & S_IROTH)
finfo->mode |= FILEINFO_IROTH;
if (perms & S_IWOTH)
finfo->mode |= FILEINFO_IWOTH;
if (perms & S_IXOTH)
finfo->mode |= FILEINFO_IXOTH;
#endif
}
/**
* Converts all Windows path separators \ to /.
*/
static void normalize_sep(char *path)
{
for (; *path; path++) {
if (*path == '\\') {
*path = '/';
}
}
}
static int os_closesocket(OS_SOCKET s)
{
#if defined(_WIN32)
return closesocket(s);
#else
return close(s);
#endif
}
/**
* Sends all bytes in a buffer.
*
* Returns the number of bytes sent or -1 if an error occurred.
*/
static ssize_t send_all(OS_SOCKET sockfd, const void *buffer, size_t n, int flags)
{
ssize_t nsent = 0;
ssize_t sent_total = 0;
while ((nsent = send(sockfd, (char *)buffer + sent_total, n - (size_t)sent_total, flags)) > 0) {
sent_total += nsent;
if ((size_t)sent_total >= n) {
break;
}
}
if (nsent < 0) {
return nsent;
}
return sent_total;
}
/**
* Reads from socket until a CRLF is found or until the buffer is full. If a
* CRLF is found it is replaced by a terminating null. On success buffer will
* always be filled with a valid string.
*
* Return the length of the string or -1 if an error occurred or if buffer is
* filled before finding CRLF.
*/
static ssize_t recv_str(OS_SOCKET sockfd, void *buffer, size_t n, int flags)
{
ssize_t nread = 0;
size_t read_total = 0;
while (1) {
nread = recv(sockfd, ((char *)buffer) + read_total, n - read_total, flags);
if (nread <= 0) {
if (nread < 0 && errno == EINTR) {
continue;
} else {
return nread;
}
}
read_total += nread;
if (read_total >= n) {
return -1;
}
/* We are assuming a CR is always followed by a LF */
char *pos = memchr(buffer, '\r', read_total);
if (pos != NULL) {
*pos = '\0';
read_total = pos - (char *)buffer;
break;
}
}
return read_total;
}
static int send_file(OS_SOCKET sockfd, void *buffer, size_t n, int flags, FILE *srcfile)
{
size_t nread = 0;
while ((nread = fread(buffer, 1, n, srcfile)) > 0) {
if (send_all(sockfd, buffer, nread, flags) != (ssize_t)nread) {
return -1;
}
}
return 0;
}
static int recv_file(OS_SOCKET sockfd, void *buffer, size_t n, int flags, FILE *outfile, size_t fsize)
{
ssize_t nread = 0;
size_t read_total = 0;
while (read_total < fsize) {
nread = recv(sockfd, buffer, MIN(n, fsize - read_total), flags);
if (nread <= 0) {
if (nread < 0 && errno == EINTR) {
continue;
} else {
return -1;
}
}
read_total += nread;
if (fwrite(buffer, nread, 1, outfile) != 1) {
return -1;
}
}
return 0;
}
/**
* Exponential backoff on connection tries.
*/
static int connect_retry(OS_SOCKET sockfd, const struct sockaddr *addr, socklen_t socklen)
{
int maxsleep = 64; /* About 1 minute. */
for (int numsec = 1; numsec < maxsleep; numsec <<= 1) {
if (connect(sockfd, addr, socklen) == 0) {
return 0;
}
if (numsec <= maxsleep / 2) {
#if defined(_WIN32)
Sleep(numsec * 1000);
#else
sleep(numsec);
#endif
}
}
return -1;
}
/**
* Parses a string of the form <IPv4 address>[:port]:path/to/file/or/directory
* and sets the appropriate address, port, and dest strings.
*
* The input string is modified and address, port, and dest will be pointers to
* different areas of the input string.
*
* Returns -1 if it is not a valid input string, otherwise returns 0 and sets
* the given strings.
*/
static int parse_destination(char *str, char **address, char **port, char **dest)
{
const char delim = ':';
*address = *port = *dest = NULL;
char *ptr = strchr(str, delim);
if (ptr == NULL) {
return -1;
}
*address = str;
*ptr = '\0';
ptr++;
str = ptr;
while (isdigit(*ptr)) {
ptr++;
}
if (*ptr != delim) {
*dest = str;
return 0;
}
*port = str;
*ptr = '\0';
*dest = ptr + 1;
return 0;
}
static int incp_connect(int argc, char *argv[])
{
struct addrinfo *ailist;
struct addrinfo *aip;
struct addrinfo hints;
OS_SOCKET sockfd = OS_INVALID_SOCKET;
int err = 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
/* Parse the address, port, and destination from the last argument. They
* should be in the form 127.0.0.1:4627:dest/path and port is optional. */
char *address, *port, *dest;
if (parse_destination(argv[argc - 1], &address, &port, &dest) != 0) {
print_usage();
return -1;
}
if ((err = getaddrinfo(address, port == NULL ? DEFAULT_PORT : port, &hints, &ailist)) != 0) {
fprintf(stderr, "Error: getaddrinfo: %s\n", gai_strerror(err));
return -1;
}
for (aip = ailist; aip != NULL; aip = aip->ai_next) {
if ((sockfd = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol)) == OS_INVALID_SOCKET) {
continue;
}
if (connect_retry(sockfd, aip->ai_addr, aip->ai_addrlen) != 0) {
os_closesocket(sockfd);
sockfd = OS_INVALID_SOCKET;
continue;
}
break;
}
if (sockfd == OS_INVALID_SOCKET) {
perror("Error");
freeaddrinfo(ailist);
return -1;
}
FILE *srcfile = NULL;
FileInfo finfo;
memset(&finfo, 0, sizeof(finfo));
int send_len = 0;
char buffer[BUFFER_SIZE];
/* Get greeting from server. */
if (recv_str(sockfd, buffer, sizeof(buffer), 0) <= 0 || strcmp(buffer, INCP_MSG_HELLO) != 0) {
fprintf(stderr, "Error: unexpected reply from server\n");
err = -1;
goto cleanup;
}
/* Send server destination info. */
/* If there are more than 1 source files we expect the destination file to be a directory. */
size_t len = strlen(dest);
if (len >= sizeof(finfo.name) - 1) {
errno = ENAMETOOLONG;
perror("Error: destination path");
err = -1;
goto cleanup;
}
strcpy(finfo.name, dest);
if ((send_len = fileinfo_snprint(&finfo, buffer, sizeof(buffer))) >= (int)sizeof(buffer)) {
errno = ENAMETOOLONG;
perror("Error: destination path");
err = -1;
goto cleanup;
}
if (send_all(sockfd, buffer, send_len, 0) != send_len) {
fprintf(stderr, "Error: failed to send file info\n");
err = -1;
goto cleanup;
}
send_len = strlen(CRLF);
if (send_all(sockfd, CRLF, send_len, 0) != send_len) {
fprintf(stderr, "Error: failed to send CRLF\n");
err = -1;
goto cleanup;
}
/* Expect OK reply. */
if (recv_str(sockfd, buffer, sizeof(buffer), 0) <= 0 || strcmp(buffer, INCP_MSG_OK) != 0) {
fprintf(stderr, "Error: server did not reply OK\n");
err = -1;
goto cleanup;
}
for (size_t i = 0; (int)i < argc - 1; i++) {
/* Send server source info. */
memset(&finfo, 0, sizeof(finfo));
struct OS_STAT statinfo;
if ((err = OS_STAT(argv[i], &statinfo)) != 0) {
perror("Error: stat");
goto cleanup;
}
fileinfo_setperm(&finfo, &statinfo);
finfo.size = statinfo.st_size;
len = strlen(argv[i]);
if (len >= sizeof(finfo.name) - 1) {
errno = ENAMETOOLONG;
perror("Error: source path");
err = -1;
goto cleanup;
}
strcpy(finfo.name, argv[i]);
if ((send_len = fileinfo_snprint(&finfo, buffer, sizeof(buffer))) >= (int)sizeof(buffer)) {
errno = ENAMETOOLONG;
perror("Error: destination path");
err = -1;
goto cleanup;
}
if (send_all(sockfd, buffer, send_len, 0) != send_len) {
fprintf(stderr, "Error: failed to send file info\n");
err = -1;
goto cleanup;
}
send_len = strlen(CRLF);
if (send_all(sockfd, CRLF, send_len, 0) != send_len) {
fprintf(stderr, "Error: failed to send CRLF\n");
err = -1;
goto cleanup;
}
/* Expect OK reply. */
if (recv_str(sockfd, buffer, sizeof(buffer), 0) <= 0 || strcmp(buffer, INCP_MSG_OK) != 0) {
fprintf(stderr, "Error: server did not reply OK\n");
err = -1;
goto cleanup;
}
/* Send source file to server as bytes. */
srcfile = fopen(argv[i], "rb");
if (srcfile == NULL) {
err = -1;
perror("Error: fopen");
goto cleanup;
}
// if (send_file(sockfd, buffer, sizeof(buffer), MSG_NOSIGNAL, srcfile) != 0) {
if (send_file(sockfd, buffer, sizeof(buffer), 0, srcfile) != 0) {
perror("Error: failed to upload file");
err = -1;
goto cleanup;
}
fclose(srcfile);
srcfile = NULL;
/* Expect OK reply. */
if (recv_str(sockfd, buffer, sizeof(buffer), 0) <= 0 || strcmp(buffer, INCP_MSG_OK) != 0) {
fprintf(stderr, "Error: server did not reply OK\n");
err = -1;
goto cleanup;
}
}
cleanup:
if (srcfile != NULL) {
fclose(srcfile);
}
os_closesocket(sockfd);
freeaddrinfo(ailist);
return err;
}
static int incp_listen(const char *port)
{
struct addrinfo *ailist;
struct addrinfo *aip;
struct addrinfo hints;
OS_SOCKET sockfd = OS_INVALID_SOCKET;
int err = 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ((err = getaddrinfo(NULL, port, &hints, &ailist)) != 0) {
fprintf(stderr, "Error: getaddrinfo: %s\n", gai_strerror(err));
return -1;
}
for (aip = ailist; aip != NULL; aip = aip->ai_next) {
if ((sockfd = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol)) == OS_INVALID_SOCKET) {
continue;
}
int on = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) != 0) {
os_closesocket(sockfd);
sockfd = OS_INVALID_SOCKET;
continue;
}
if (bind(sockfd, aip->ai_addr, aip->ai_addrlen) != 0) {
os_closesocket(sockfd);
sockfd = OS_INVALID_SOCKET;
continue;
}
if (listen(sockfd, BACKLOG) != 0) {
os_closesocket(sockfd);
sockfd = OS_INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(ailist);
if (sockfd == OS_INVALID_SOCKET) {
perror("Error: failed to start server");
return -1;
}
struct sockaddr_storage client_addr;
socklen_t client_addr_size = sizeof(client_addr);
OS_SOCKET clientfd = accept(sockfd, (struct sockaddr *)&client_addr, &client_addr_size);
if (clientfd == OS_INVALID_SOCKET) {
perror("Error: accept");
return -1;
}
FILE *outfile = NULL;
FileInfo destfinfo;
memset(&destfinfo, 0, sizeof(destfinfo));
FileInfo srcfinfo;
memset(&srcfinfo, 0, sizeof(srcfinfo));
char buffer[BUFFER_SIZE];
ssize_t read;
/* Send hello. */
if ((err = send_all(clientfd, INCP_MSG_HELLO CRLF, strlen(INCP_MSG_HELLO CRLF), 0)) == -1) {
perror("Error: send");
goto cleanup;
}
/* Get destination file info from client. */
read = recv_str(clientfd, buffer, sizeof(buffer), 0);
if (read <= 0) {
fprintf(stderr, "Error: failed to get data from client\n");
goto cleanup;
}
if ((err = fileinfo_parse(&destfinfo, buffer)) != 0) {
fprintf(stderr, "Error: bad file info\n");
goto cleanup;
}
normalize_sep(destfinfo.name);
struct OS_STAT s;
if (OS_STAT(destfinfo.name, &s) == 0) {
/* File exists. */
fileinfo_setperm(&destfinfo, &s);
} else {
/* File does not exist. */
destfinfo.mode = FILEINFO_ISREG;
}
/* Send OK */
if ((err = send_all(clientfd, INCP_MSG_OK CRLF, strlen(INCP_MSG_OK CRLF), 0)) == -1) {
perror("Error: send");
goto cleanup;
}
while (1) {
/* Get source file info from client. */
read = recv_str(clientfd, buffer, sizeof(buffer), 0);
if (read == 0) {
/* No more files to process. */
err = 0;
goto cleanup;
} else if (read < 0) {
fprintf(stderr, "Error: failed to get data from client\n");
goto cleanup;
}
if ((err = fileinfo_parse(&srcfinfo, buffer)) != 0) {
fprintf(stderr, "Error: bad file info\n");
goto cleanup;
}
normalize_sep(srcfinfo.name);
/* Send OK */
if ((err = send_all(clientfd, INCP_MSG_OK CRLF, strlen(INCP_MSG_OK CRLF), 0)) == -1) {
perror("Error: send");
goto cleanup;
}
/* Copy file to destination. */
char path[1024];
if (destfinfo.mode & FILEINFO_ISDIR) {
char *name = strrchr(srcfinfo.name, '/'); /* Only get the file name. */
if (name != NULL) {
name++; /* Do not start the name with '/'. */
} else {
name = srcfinfo.name;
}
size_t len = strlen(destfinfo.name);
bool has_sep = len > 0 && destfinfo.name[len - 1] == '/';
if (snprintf(path, sizeof(path), "%s%s%s", destfinfo.name, has_sep ? "" : "/", name) >= (int)sizeof(path)) {
errno = ENAMETOOLONG;
perror("Error");
err = -1;
goto cleanup;
}
} else {
/* This should always be false. In case path and FileInfo.name have
* different buffer sizes. */
if (strlen(destfinfo.name) >= sizeof(path) - 1) {
errno = ENAMETOOLONG;
perror("Error");
err = -1;
goto cleanup;
}
strcpy(path, destfinfo.name);
}
printf("%s\n", path);
FileInfo info_tocopy;
memset(&info_tocopy, 0, sizeof(info_tocopy));
if (OS_STAT(path, &s) == 0) {
/* File exists. */
fileinfo_setperm(&info_tocopy, &s);
} else {
/* File does not exist. */
info_tocopy = srcfinfo;
}
outfile = fopen(path, "wb");
if (outfile == NULL) {
perror("Error: fopen");
err = -1;
goto cleanup;
}
// if ((err = recv_file(clientfd, buffer, sizeof(buffer), MSG_NOSIGNAL, outfile, srcfinfo.size)) != 0) {
if ((err = recv_file(clientfd, buffer, sizeof(buffer), 0, outfile, srcfinfo.size)) != 0) {
fprintf(stderr, "Error: an error occurred while trying to download file\n");
goto cleanup;
}
fclose(outfile);
outfile = NULL;
if ((err = fileinfo_cpyperm(&info_tocopy, path)) != 0) {
perror("Error");
goto cleanup;
}
/* Send OK */
if ((err = send_all(clientfd, INCP_MSG_OK CRLF, strlen(INCP_MSG_OK CRLF), 0)) == -1) {
perror("Error: send");
goto cleanup;
}
}
cleanup:
if (outfile != NULL) {
fclose(outfile);
}
os_closesocket(clientfd);
os_closesocket(sockfd);
return err;
}
int main(int argc, char *argv[])
{
if (argc < 2) {
print_usage();
exit(EXIT_FAILURE);
}
#if defined(_WIN32)
WSADATA wsadata;
if (WSAStartup(MAKEWORD(2, 2), &wsadata) != 0) {
fprintf(stderr, "Error: WSAStartup failed\n");
exit(EXIT_FAILURE);
}
#endif
int is_listen = strcmp(argv[1], "-l") == 0;
if (!is_listen && argc < 3) {
print_usage();
exit(EXIT_FAILURE);
}
if (is_listen) {
char *port = NULL;
if (argc >= 3) {
port = argv[2];
}
if (incp_listen(port == NULL ? DEFAULT_PORT : port) != 0) {
exit(EXIT_FAILURE);
}
} else {
if (incp_connect(argc - 1, &argv[1]) != 0) {
exit(EXIT_FAILURE);
}
}
#if defined(_WIN32)
WSACleanup();
#endif
return 0;
}