smbget.c

samba-3.0.22.tar.gz 编译smb服务器的源码

	} else newpath = name;

	if(newpath[0] == '/')newpath++;
	
	/* Open local file and, if necessary, resume */
	if(!send_stdout) {
		localhandle = open(newpath, O_CREAT | O_NONBLOCK | O_RDWR | (!resume?O_EXCL:0), 0755);
		if(localhandle < 0) {
			fprintf(stderr, "Can't open %s: %s\n", newpath, strerror(errno));
			smbc_close(remotehandle);
			return 0;
		}
	
		fstat(localhandle, &localstat);

		start_offset = localstat.st_size;

		if(localstat.st_size && localstat.st_size == remotestat.st_size) {
			if(verbose)fprintf(stderr, "%s is already downloaded completely.\n", path);
			else if(!quiet)fprintf(stderr, "%s\n", path);
			smbc_close(remotehandle);
			close(localhandle);
			return 1;
		}

		if(localstat.st_size > RESUME_CHECK_OFFSET && remotestat.st_size > RESUME_CHECK_OFFSET) {
			offset_download = localstat.st_size - RESUME_DOWNLOAD_OFFSET;
			offset_check = localstat.st_size - RESUME_CHECK_OFFSET;
			if(verbose)printf("Trying to start resume of %s at "OFF_T_FORMAT"\n"
				   "At the moment "OFF_T_FORMAT" of "OFF_T_FORMAT" bytes have been retrieved\n",
				newpath, (OFF_T_FORMAT_CAST)offset_check, 
				(OFF_T_FORMAT_CAST)localstat.st_size,
				(OFF_T_FORMAT_CAST)remotestat.st_size);
		}

		if(offset_check) { 
			off_t off1, off2;
			/* First, check all bytes from offset_check to offset_download */
			off1 = lseek(localhandle, offset_check, SEEK_SET);
			if(off1 < 0) {
				fprintf(stderr, "Can't seek to "OFF_T_FORMAT" in local file %s\n",
					(OFF_T_FORMAT_CAST)offset_check, newpath);
				smbc_close(remotehandle); close(localhandle);
				return 0;
			}

			off2 = smbc_lseek(remotehandle, offset_check, SEEK_SET); 
			if(off2 < 0) {
				fprintf(stderr, "Can't seek to "OFF_T_FORMAT" in remote file %s\n",
					(OFF_T_FORMAT_CAST)offset_check, newpath);
				smbc_close(remotehandle); close(localhandle);
				return 0;
			}

			if(off1 != off2) {
				fprintf(stderr, "Offset in local and remote files is different (local: "OFF_T_FORMAT", remote: "OFF_T_FORMAT")\n",
					(OFF_T_FORMAT_CAST)off1,
					(OFF_T_FORMAT_CAST)off2);
				return 0;
			}

			if(smbc_read(remotehandle, checkbuf[0], RESUME_CHECK_SIZE) != RESUME_CHECK_SIZE) {
				fprintf(stderr, "Can't read %d bytes from remote file %s\n", RESUME_CHECK_SIZE, path);
				smbc_close(remotehandle); close(localhandle);
				return 0;
			}

			if(read(localhandle, checkbuf[1], RESUME_CHECK_SIZE) != RESUME_CHECK_SIZE) {
				fprintf(stderr, "Can't read %d bytes from local file %s\n", RESUME_CHECK_SIZE, name);
				smbc_close(remotehandle); close(localhandle);
				return 0;
			}

			if(memcmp(checkbuf[0], checkbuf[1], RESUME_CHECK_SIZE) == 0) {
				if(verbose)printf("Current local and remote file appear to be the same. Starting download from offset "OFF_T_FORMAT"\n", (OFF_T_FORMAT_CAST)offset_download);
			} else {
				fprintf(stderr, "Local and remote file appear to be different, not doing resume for %s\n", path);
				smbc_close(remotehandle); close(localhandle);
				return 0;
			}
		}
	} else {
		localhandle = STDOUT_FILENO;
		start_offset = 0;
		offset_download = 0;
		offset_check = 0;
	}

	readbuf = SMB_MALLOC(blocksize);

	/* Now, download all bytes from offset_download to the end */
	for(curpos = offset_download; curpos < remotestat.st_size; curpos+=blocksize) {
		ssize_t bytesread = smbc_read(remotehandle, readbuf, blocksize);
		if(bytesread < 0) {
			fprintf(stderr, "Can't read %u bytes at offset "OFF_T_FORMAT", file %s\n", (unsigned int)blocksize, (OFF_T_FORMAT_CAST)curpos, path);
			smbc_close(remotehandle);
			if (localhandle != STDOUT_FILENO) close(localhandle);
			free(readbuf);
			return 0;
		}

		total_bytes += bytesread;

		if(write(localhandle, readbuf, bytesread) < 0) {
			fprintf(stderr, "Can't write %u bytes to local file %s at offset "OFF_T_FORMAT"\n", (unsigned int)bytesread, path, (OFF_T_FORMAT_CAST)curpos);
			free(readbuf);
			smbc_close(remotehandle);
			if (localhandle != STDOUT_FILENO) close(localhandle);
			return 0;
		}

		if(dots)fputc('.', stderr);
		else if(!quiet) {
			print_progress(newpath, start_time, time(NULL), start_offset, curpos, remotestat.st_size);
		}
	}

	free(readbuf);

	if(dots){
		fputc('\n', stderr);
		printf("%s downloaded\n", path);
	} else if(!quiet) {
		int i;
		fprintf(stderr, "\r%s", path);
		if(columns) {
			for(i = strlen(path); i < columns; i++) {
				fputc(' ', stderr);
			}
		}
		fputc('\n', stderr);
	}

	if(keep_permissions && !send_stdout) {
		if(fchmod(localhandle, remotestat.st_mode) < 0) {
			fprintf(stderr, "Unable to change mode of local file %s to %o\n", path, remotestat.st_mode);
			smbc_close(remotehandle);
			close(localhandle);
			return 0;
		}
	}

	smbc_close(remotehandle);
	if (localhandle != STDOUT_FILENO) close(localhandle);
	return 1;
}

void clean_exit(void)
{
	char bs[100];
	human_readable(total_bytes, bs, sizeof(bs));
	if(!quiet)fprintf(stderr, "Downloaded %s in %lu seconds\n", bs, time(NULL) - total_start_time);
	exit(0);
}

void signal_quit(int v)
{
	clean_exit();
}

int readrcfile(const char *name, const struct poptOption long_options[])
{
	FILE *fd = fopen(name, "r");
	int lineno = 0, i;
	char var[101], val[101];
	char found;
	int *intdata; char **stringdata;
	if(!fd) {
		fprintf(stderr, "Can't open RC file %s\n", name);
		return 1;
	}

	while(!feof(fd)) {
		lineno++;
		if(fscanf(fd, "%100s %100s\n", var, val) < 2) {
			fprintf(stderr, "Can't parse line %d of %s, ignoring.\n", lineno, name);
			continue;
		}

		found = 0;

		for(i = 0; long_options[i].shortName; i++) {
			if(!long_options[i].longName)continue;
			if(strcmp(long_options[i].longName, var)) continue;
			if(!long_options[i].arg)continue;

			switch(long_options[i].argInfo) {
			case POPT_ARG_NONE:
				intdata = (int *)long_options[i].arg;
				if(!strcmp(val, "on")) *intdata = 1;
				else if(!strcmp(val, "off")) *intdata = 0;
				else fprintf(stderr, "Illegal value %s for %s at line %d in %s\n", val, var, lineno, name);
				break;
			case POPT_ARG_INT:
				intdata = (int *)long_options[i].arg;
				*intdata = atoi(val);
				break;
			case POPT_ARG_STRING:
				stringdata = (char **)long_options[i].arg;
				*stringdata = SMB_STRDUP(val);
				break;
			default:
				fprintf(stderr, "Invalid variable %s at line %d in %s\n", var, lineno, name);
				break;
			}

			found = 1;
		}
		if(!found) {
			fprintf(stderr, "Invalid variable %s at line %d in %s\n", var, lineno, name);
		}
	}

	fclose(fd);
	return 0;
}

int main(int argc, const char **argv)
{
	int c = 0;
	const char *file = NULL;
	char *rcfile = NULL;
	struct poptOption long_options[] = {
		{"guest", 'a', POPT_ARG_NONE, NULL, 'a', "Work as user guest" },	
		{"resume", 'r', POPT_ARG_NONE, &_resume, 0, "Automatically resume aborted files" },
		{"recursive", 'R',  POPT_ARG_NONE, &_recursive, 0, "Recursively download files" },
		{"username", 'u', POPT_ARG_STRING, &username, 'u', "Username to use" },
		{"password", 'p', POPT_ARG_STRING, &password, 'p', "Password to use" },
		{"workgroup", 'w', POPT_ARG_STRING, &workgroup, 'w', "Workgroup to use (optional)" },
		{"nonprompt", 'n', POPT_ARG_NONE, &nonprompt, 'n', "Don't ask anything (non-interactive)" },
		{"debuglevel", 'd', POPT_ARG_INT, &debuglevel, 'd', "Debuglevel to use" },
		{"outputfile", 'o', POPT_ARG_STRING, &outputfile, 'o', "Write downloaded data to specified file" },
		{"stdout", 'O', POPT_ARG_NONE, &send_stdout, 'O', "Write data to stdout" },
		{"dots", 'D', POPT_ARG_NONE, &dots, 'D', "Show dots as progress indication" },
		{"quiet", 'q', POPT_ARG_NONE, &quiet, 'q', "Be quiet" },
		{"verbose", 'v', POPT_ARG_NONE, &verbose, 'v', "Be verbose" },
		{"keep-permissions", 'P', POPT_ARG_NONE, &keep_permissions, 'P', "Keep permissions" },
		{"blocksize", 'b', POPT_ARG_INT, &blocksize, 'b', "Change number of bytes in a block"},
		{"rcfile", 'f', POPT_ARG_STRING, NULL, 0, "Use specified rc file"},
		POPT_AUTOHELP
		POPT_TABLEEND
	};
	poptContext pc;

	load_case_tables();

	/* only read rcfile if it exists */
	asprintf(&rcfile, "%s/.smbgetrc", getenv("HOME"));
	if(access(rcfile, F_OK) == 0) 
		readrcfile(rcfile, long_options);
	free(rcfile);

#ifdef SIGWINCH
	signal(SIGWINCH, change_columns);
#endif
	signal(SIGINT, signal_quit);
	signal(SIGTERM, signal_quit);

	pc = poptGetContext(argv[0], argc, argv, long_options, 0);

	while((c = poptGetNextOpt(pc)) >= 0) {
		switch(c) {
		case 'f':
			readrcfile(poptGetOptArg(pc), long_options);
			break;
		case 'a':
			username = ""; password = "";
			break;
		}
	}

	if((send_stdout || outputfile) && _recursive) {
		fprintf(stderr, "The -o or -O and -R options can not be used together.\n");
		return 1;
	}

	if(outputfile && send_stdout) {
		fprintf(stderr, "The -o and -O options cannot be used together.\n");
		return 1;
	}

	if(smbc_init(get_auth_data, debuglevel) < 0) {
		fprintf(stderr, "Unable to initialize libsmbclient\n");
		return 1;
	}

	columns = get_num_cols();

	total_start_time = time(NULL);

	while ( (file = poptGetArg(pc)) ) {
		if (!_recursive) 
			return smb_download_file(file, "", _recursive, _resume, outputfile);
		else 
			return smb_download_dir(file, "", _resume);
	}

	clean_exit();

	return 0;
}