使用mbedtls库实现ftps协议

ftp的隐式加密、显式加密、不加密这三种方式有一些区别。
ftp协议可以直接抓包查看，没啥好说的。
ftps抓包无法查看加密的那一部分，因为这个原因，调试显式加密时坑惨了我。

FTP隐式加密流程：

与服务器信令端口建立TCP连接
TCP连接成功后，直接进行ssl握手
握手成功后，使用USER/PASS指令进行登录。

涉及数据端口的指令流程，如LIST指令：
使用被动模式：

发送PASV指令后，得到服务器的数据端口，
进行数据端口的TCP连接，（注意：这时还不能进行数据端口的SSL握手）
发送LIST指令，收到 150 accept data connection
进行数据端口的SSL握手
接收数据

FTP显式加密流程：

与服务器信令端口建立TCP连接
TCP连接成功后，使用AUTH 指令进行加密协商。
收到 234 的响应码，说明服务器支持显式加密
进行信令端口的SSL握手
握手成功后，使用USER/PASS指令进行登录。
使用PBSZ /PROT指令进行数据端口的加密协商（不进行协商，无法进行数据传输）

涉及数据端口的指令流程，与隐式加密相同，区别在于：在发送LIST等涉及数据端口的指令前，一定要先发送PBSZ/PROT指令进行数据端口的加密等级协商，否则服务器可能断开连接。

下面两个例子都是使用MBEDTLS库的例子改的

隐式加密示例：

/**  SSL client demonstration program**  Copyright The Mbed TLS Contributors*  SPDX-License-Identifier: Apache-2.0**  Licensed under the Apache License, Version 2.0 (the "License"); you may*  not use this file except in compliance with the License.*  You may obtain a copy of the License at**  http://www.apache.org/licenses/LICENSE-2.0**  Unless required by applicable law or agreed to in writing, software*  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT*  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.*  See the License for the specific language governing permissions and*  limitations under the License.*/#include "mbedtls/build_info.h"
#include <string.h>#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_time time
#define mbedtls_time_t time_t
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#define mbedtls_exit exit
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||     \!defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) ||    \!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) ||            \!defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_CTR_DRBG_C) || \!defined(MBEDTLS_X509_CRT_PARSE_C)
int main(void)
{mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or ""MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or ""MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or ""MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C ""not defined.\n");mbedtls_exit(0);
}
#else#include "mbedtls/net_sockets.h"
#include "mbedtls/debug.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/error.h"
#include "test/certs.h"#include <string.h>#define SERVER_PORT "990"
#define SERVER_NAME "110.78.86.97"
#define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"#define DEBUG_LEVEL 1static void my_debug(void *ctx, int level,const char *file, int line,const char *str)
{((void)level);mbedtls_fprintf((FILE *)ctx, "%s:%04d: %s", file, line, str);fflush((FILE *)ctx);
}typedef enum
{USER = 1,PASS,LIST,TYPE,PASV,WAIT_DATA_CONNECT,WAIT_HANDSHAKE,IDLE} state;state ftp_state = IDLE;char data_port[10] = {0};int nb_fds = 100;
int do_connect(mbedtls_net_context *server_fd)
{int ret = 0;// uint32_t flags;/** 1. Start the connection*/mbedtls_printf("  . Connecting to tcp/%s/%s...", SERVER_NAME, data_port);fflush(stdout);if ((ret = mbedtls_net_connect(server_fd, SERVER_NAME,data_port, MBEDTLS_NET_PROTO_TCP)) != 0){mbedtls_printf(" failed\n  ! mbedtls_net_connect returned %d\n\n", ret);goto exit;}if (ret == 0){if (nb_fds < server_fd->fd)nb_fds = server_fd->fd;++nb_fds;}mbedtls_printf(" ok\n");exit:return ret;
}int do_handshake(mbedtls_net_context *server_fd, mbedtls_ssl_context *ssl, mbedtls_ssl_config *conf, mbedtls_x509_crt *cacert, mbedtls_ctr_drbg_context *ctr_drbg)
{int ret = 0;uint32_t flags;/** 2. Setup stuff*/mbedtls_printf("  . Setting up the SSL/TLS structure...");fflush(stdout);if ((ret = mbedtls_ssl_config_defaults(conf,MBEDTLS_SSL_IS_CLIENT,MBEDTLS_SSL_TRANSPORT_STREAM,MBEDTLS_SSL_PRESET_DEFAULT)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret);goto exit;}mbedtls_printf(" ok\n");/* OPTIONAL is not optimal for security,* but makes interop easier in this simplified example */mbedtls_ssl_conf_authmode(conf, MBEDTLS_SSL_VERIFY_OPTIONAL);mbedtls_ssl_conf_ca_chain(conf, cacert, NULL);mbedtls_ssl_conf_rng(conf, mbedtls_ctr_drbg_random, ctr_drbg);mbedtls_ssl_conf_dbg(conf, my_debug, stdout);if ((ret = mbedtls_ssl_setup(ssl, conf)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret);goto exit;}if ((ret = mbedtls_ssl_set_hostname(ssl, SERVER_NAME)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret);goto exit;}mbedtls_ssl_set_bio(ssl, server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);/** 4. Handshake*/mbedtls_printf("  . Performing the SSL/TLS handshake...");fflush(stdout);while ((ret = mbedtls_ssl_handshake(ssl)) != 0){if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE){mbedtls_printf(" failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int)-ret);goto exit;}}mbedtls_printf(" ok\n");/** 5. Verify the server certificate*/mbedtls_printf("  . Verifying peer X.509 certificate...");/* In real life, we probably want to bail out when ret != 0 */if ((flags = mbedtls_ssl_get_verify_result(ssl)) != 0){#if !defined(MBEDTLS_X509_REMOVE_INFO)char vrfy_buf[512];
#endifmbedtls_printf(" failed\n");#if !defined(MBEDTLS_X509_REMOVE_INFO)mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "  ! ", flags);mbedtls_printf("%s\n", vrfy_buf);
#endif}elsembedtls_printf(" ok\n");return 0;
exit:return -1;
}state parse_buf(char *buf, int len)
{// mbedtls_printf( " parse:%d\n",ftp_state);if (strstr(buf, "331 ")){ftp_state = PASS;goto exit;}if (strstr(buf, "226 ") && ftp_state == IDLE){ftp_state = TYPE;mbedtls_printf(" change state to pasv \n");goto exit;}if (strstr(buf, "230 ") && ftp_state == PASS){ftp_state = TYPE;goto exit;}if (strstr(buf, "200 ") && ftp_state == TYPE){ftp_state = PASV;mbedtls_printf(" change state to pasv \n");goto exit;}if (ftp_state == LIST){ftp_state = WAIT_HANDSHAKE;goto exit;}if (strstr(buf, "227 ")){char *p = NULL;if (p = strstr(buf, "110.78.86.97")){char *q = p + 13;printf("%s", q);int first = 0, second = 0;sscanf(q, "%d,%d)", &first, &second);printf("%d %d\n", first, second);int port = 0;port = first * 256 + second;sprintf(data_port, "%d", port);printf("%d %s\n", port, data_port);}ftp_state = LIST;goto exit;}// ftp_state = IDLE;exit:// mbedtls_printf( " %s %d end\n",buf,ftp_state);return ftp_state;
}static void _free(mbedtls_net_context *server_fd, mbedtls_ssl_context *ssl, mbedtls_ssl_config *conf, mbedtls_x509_crt *cacert, mbedtls_ctr_drbg_context *ctr_drbg, mbedtls_entropy_context *entropy)
{mbedtls_ssl_close_notify(ssl);printf("  . Closing the connection...");mbedtls_net_free(server_fd);mbedtls_x509_crt_free(cacert);mbedtls_ssl_free(ssl);mbedtls_ssl_config_free(conf);mbedtls_ctr_drbg_free(ctr_drbg);mbedtls_entropy_free(entropy);
}static void _init(mbedtls_net_context *server_fd, mbedtls_ssl_context *ssl, mbedtls_ssl_config *conf, mbedtls_x509_crt *cacert, mbedtls_ctr_drbg_context *ctr_drbg, mbedtls_entropy_context *entropy)
{const char *pers = "ssl_client1";mbedtls_net_init(server_fd);mbedtls_ssl_init(ssl);mbedtls_ssl_config_init(conf);mbedtls_x509_crt_init(cacert);mbedtls_ctr_drbg_init(ctr_drbg);mbedtls_entropy_init(entropy);int ret = 0;if ((ret = mbedtls_ctr_drbg_seed(ctr_drbg, mbedtls_entropy_func, entropy,(const unsigned char *)pers,strlen(pers))) != 0){mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret);goto exit;}
exit:return;
}static int write_ssl_data(mbedtls_ssl_context *ssl, unsigned char *buf, size_t len)
{int ret;mbedtls_printf("\n%s", buf);while (len && (ret = mbedtls_ssl_write(ssl, buf, len)) <= 0){if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE){mbedtls_printf(" failed\n  ! mbedtls_ssl_write returned %d\n\n", ret);return -1;}}return (0);
}int main(void)
{int ret = 1, len;int exit_code = MBEDTLS_EXIT_FAILURE;mbedtls_net_context server_fd;mbedtls_net_context data_fd;uint32_t flags;unsigned char buf[1024];const char *pers = "ssl_client1";mbedtls_entropy_context entropy;mbedtls_ctr_drbg_context ctr_drbg;mbedtls_ssl_context ssl;mbedtls_ssl_config conf;mbedtls_x509_crt cacert;mbedtls_entropy_context entropy_1;mbedtls_ctr_drbg_context ctr_drbg_1;mbedtls_ssl_context ssl_1;mbedtls_ssl_config conf_1;mbedtls_x509_crt cacert_1;#if defined(MBEDTLS_DEBUG_C)mbedtls_debug_set_threshold(DEBUG_LEVEL);
#endif/** 0. Initialize the RNG and the session data*/mbedtls_net_init(&server_fd);mbedtls_ssl_init(&ssl);mbedtls_ssl_config_init(&conf);mbedtls_x509_crt_init(&cacert);mbedtls_ctr_drbg_init(&ctr_drbg);mbedtls_printf("\n  . Seeding the random number generator...");fflush(stdout);mbedtls_entropy_init(&entropy);if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,(const unsigned char *)pers,strlen(pers))) != 0){mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret);goto exit;}mbedtls_printf(" ok\n");/** 0. Initialize certificates*/mbedtls_printf("  . Loading the CA root certificate ...");fflush(stdout);ret = mbedtls_x509_crt_parse(&cacert, (const unsigned char *)mbedtls_test_cas_pem,mbedtls_test_cas_pem_len);if (ret < 0){mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int)-ret);goto exit;}ret = mbedtls_x509_crt_parse(&cacert_1, (const unsigned char *)mbedtls_test_cas_pem,mbedtls_test_cas_pem_len);if (ret < 0){mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int)-ret);goto exit;}mbedtls_printf(" ok (%d skipped)\n", ret);/** 1. Start the connection*/mbedtls_printf("  . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT);fflush(stdout);if ((ret = mbedtls_net_connect(&server_fd, SERVER_NAME,SERVER_PORT, MBEDTLS_NET_PROTO_TCP)) != 0){mbedtls_printf(" failed\n  ! mbedtls_net_connect returned %d\n\n", ret);goto exit;}mbedtls_printf(" ok\n");/** 2. Setup stuff*/mbedtls_printf("  . Setting up the SSL/TLS structure...");fflush(stdout);if ((ret = mbedtls_ssl_config_defaults(&conf,MBEDTLS_SSL_IS_CLIENT,MBEDTLS_SSL_TRANSPORT_STREAM,MBEDTLS_SSL_PRESET_DEFAULT)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret);goto exit;}mbedtls_printf(" ok\n");/* OPTIONAL is not optimal for security,* but makes interop easier in this simplified example */mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_OPTIONAL);mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret);goto exit;}if ((ret = mbedtls_ssl_set_hostname(&ssl, SERVER_NAME)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret);goto exit;}mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);/** 4. Handshake*/mbedtls_printf("  . Performing the SSL/TLS handshake...");fflush(stdout);while ((ret = mbedtls_ssl_handshake(&ssl)) != 0){if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE){mbedtls_printf(" failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int)-ret);goto exit;}}mbedtls_printf(" ok\n");/** 5. Verify the server certificate*/mbedtls_printf("  . Verifying peer X.509 certificate...");/* In real life, we probably want to bail out when ret != 0 */if ((flags = mbedtls_ssl_get_verify_result(&ssl)) != 0){#if !defined(MBEDTLS_X509_REMOVE_INFO)char vrfy_buf[512];
#endifmbedtls_printf(" failed\n");#if !defined(MBEDTLS_X509_REMOVE_INFO)mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "  ! ", flags);mbedtls_printf("%s\n", vrfy_buf);
#endif}elsembedtls_printf(" ok\n");/** 3. Write the GET request*/mbedtls_printf("  > Write to server:");fflush(stdout);/** 7. Read the HTTP response*/mbedtls_printf("  < Read from server:");fflush(stdout);int first = 0;mbedtls_ssl_write(&ssl, "USER admin\r\n", 12);struct timeval tm;struct timeval *tm_ptr = NULL;fd_set read_fds;// fd_set write_fds;int max_wait = 2000;tm.tv_sec = max_wait / 1000;tm.tv_usec = (max_wait % 1000) * 1000;tm_ptr = &tm;if (nb_fds < server_fd.fd)nb_fds = server_fd.fd;if (nb_fds < data_fd.fd)nb_fds = data_fd.fd;++nb_fds;int ok = 0;while (1){FD_ZERO(&read_fds);if (server_fd.fd > 0){FD_SET(server_fd.fd, &read_fds);}if (data_fd.fd > 0){FD_SET(data_fd.fd, &read_fds);}if ((ret = select(nb_fds, &read_fds, NULL, NULL, tm_ptr)) < 0){perror("select");goto exit;}if (FD_ISSET(server_fd.fd, &read_fds)){printf("=====%d ", nb_fds);len = sizeof(buf) - 1;memset(buf, 0, sizeof(buf));mbedtls_net_set_nonblock(&ssl);ret = mbedtls_ssl_read(&ssl, buf, len);if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE)continue;if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)break;if (ret < 0){mbedtls_printf("failed\n  ! mbedtls_ssl_read returned %d\n\n", ret);break;}if (ret == 0){mbedtls_printf("\n\nEOF\n\n");break;}len = ret;mbedtls_printf(" %d bytes read\n\n%s", len, (char *)buf);switch (parse_buf(buf, len)){case PASS:mbedtls_ssl_write(&ssl, "PASS admin\r\n", 12);break;case TYPE:mbedtls_ssl_write(&ssl, "TYPE A\r\n", 8);break;case PASV:mbedtls_printf(" in pasv\n");mbedtls_ssl_write(&ssl, "PASV\r\n", 6);break;case LIST:_init(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1, &entropy_1);do_connect(&data_fd);mbedtls_ssl_write(&ssl, "NLST .\r\n", 8);if (do_handshake(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1) == 0){mbedtls_printf("success data handshake\n ");mbedtls_printf("data_fd.fd is : %d\n ", data_fd.fd);}break;case WAIT_HANDSHAKE:break;default:break;}}if (data_fd.fd!=-1 && FD_ISSET(data_fd.fd, &read_fds)){char buf1[1024] = {0};mbedtls_net_set_nonblock(&ssl_1);int ret1 = mbedtls_ssl_read(&ssl_1, buf1, 1023);if (ret1 > 0){printf("recv:\n%s\n", buf1);}else if (ret1 == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY){printf("ret1 < 0 :%d\n", ret1);_free(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1, &entropy_1);mbedtls_net_set_nonblock(&ssl);ftp_state = IDLE;}else if (ret1 == 0){printf("ret1 = 0 :%d\n", ret1);_free(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1, &entropy_1);mbedtls_net_set_nonblock(&ssl);ftp_state = IDLE;}}}mbedtls_ssl_close_notify(&ssl);exit_code = MBEDTLS_EXIT_SUCCESS;exit:#ifdef MBEDTLS_ERROR_Cif (exit_code != MBEDTLS_EXIT_SUCCESS){char error_buf[100];mbedtls_strerror(ret, error_buf, 100);mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);}
#endifmbedtls_net_free(&server_fd);mbedtls_x509_crt_free(&cacert);mbedtls_ssl_free(&ssl);mbedtls_ssl_config_free(&conf);mbedtls_ctr_drbg_free(&ctr_drbg);mbedtls_entropy_free(&entropy);#if defined(_WIN32)mbedtls_printf("  + Press Enter to exit this program.\n");fflush(stdout);getchar();
#endifmbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C && \MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&        \MBEDTLS_PEM_PARSE_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C */

显式加密示例：

/**  SSL client demonstration program**  Copyright The Mbed TLS Contributors*  SPDX-License-Identifier: Apache-2.0**  Licensed under the Apache License, Version 2.0 (the "License"); you may*  not use this file except in compliance with the License.*  You may obtain a copy of the License at**  http://www.apache.org/licenses/LICENSE-2.0**  Unless required by applicable law or agreed to in writing, software*  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT*  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.*  See the License for the specific language governing permissions and*  limitations under the License.*/#include "mbedtls/build_info.h"
#include <string.h>#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_time time
#define mbedtls_time_t time_t
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#define mbedtls_exit exit
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||     \!defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) ||    \!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) ||            \!defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_CTR_DRBG_C) || \!defined(MBEDTLS_X509_CRT_PARSE_C)
int main(void)
{mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or ""MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or ""MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or ""MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C ""not defined.\n");mbedtls_exit(0);
}
#else#include "mbedtls/net_sockets.h"
#include "mbedtls/debug.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/error.h"
#include "test/certs.h"#include <string.h>#define SERVER_PORT "21"
#define SERVER_NAME "121.75.13.180"
#define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"#define DEBUG_LEVEL 1static void my_debug(void *ctx, int level,const char *file, int line,const char *str)
{((void)level);mbedtls_fprintf((FILE *)ctx, "%s:%04d: %s", file, line, str);fflush((FILE *)ctx);
}typedef enum
{USER = 1,PASS,LIST,TYPE,PASV,WAIT_DATA_CONNECT,WAIT_HANDSHAKE,CTRL_HANDSHAKE,PBSZ,PROT,IDLE} state;state ftp_state = IDLE;char data_port[10] = {0};int nb_fds = 100;
int do_connect(mbedtls_net_context *server_fd)
{int ret = 0;// uint32_t flags;/** 1. Start the connection*/mbedtls_printf("  . Connecting to tcp/%s/%s...", SERVER_NAME, data_port);fflush(stdout);if ((ret = mbedtls_net_connect(server_fd, SERVER_NAME,data_port, MBEDTLS_NET_PROTO_TCP)) != 0){mbedtls_printf(" failed\n  ! mbedtls_net_connect returned %d\n\n", ret);goto exit;}if (ret == 0){if (nb_fds < server_fd->fd)nb_fds = server_fd->fd;++nb_fds;}mbedtls_printf(" ok\n");exit:return ret;
}int do_handshake(mbedtls_net_context *server_fd, mbedtls_ssl_context *ssl, mbedtls_ssl_config *conf, mbedtls_x509_crt *cacert, mbedtls_ctr_drbg_context *ctr_drbg)
{int ret = 0;uint32_t flags;/** 2. Setup stuff*/mbedtls_printf("  . Setting up the SSL/TLS structure...");fflush(stdout);if ((ret = mbedtls_ssl_config_defaults(conf,MBEDTLS_SSL_IS_CLIENT,MBEDTLS_SSL_TRANSPORT_STREAM,MBEDTLS_SSL_PRESET_DEFAULT)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret);goto exit;}mbedtls_printf(" ok\n");/* OPTIONAL is not optimal for security,* but makes interop easier in this simplified example */mbedtls_ssl_conf_authmode(conf, MBEDTLS_SSL_VERIFY_OPTIONAL);mbedtls_ssl_conf_ca_chain(conf, cacert, NULL);mbedtls_ssl_conf_rng(conf, mbedtls_ctr_drbg_random, ctr_drbg);mbedtls_ssl_conf_dbg(conf, my_debug, stdout);if ((ret = mbedtls_ssl_setup(ssl, conf)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret);goto exit;}if ((ret = mbedtls_ssl_set_hostname(ssl, SERVER_NAME)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret);goto exit;}mbedtls_ssl_set_bio(ssl, server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);/** 4. Handshake*/mbedtls_printf("  . Performing the SSL/TLS handshake...");fflush(stdout);while ((ret = mbedtls_ssl_handshake(ssl)) != 0){if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE){mbedtls_printf(" failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int)-ret);goto exit;}}mbedtls_printf(" ok\n");/** 5. Verify the server certificate*/mbedtls_printf("  . Verifying peer X.509 certificate...");/* In real life, we probably want to bail out when ret != 0 */if ((flags = mbedtls_ssl_get_verify_result(ssl)) != 0){#if !defined(MBEDTLS_X509_REMOVE_INFO)char vrfy_buf[512];
#endifmbedtls_printf(" failed\n");#if !defined(MBEDTLS_X509_REMOVE_INFO)mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "  ! ", flags);mbedtls_printf("%s\n", vrfy_buf);
#endif}elsembedtls_printf(" ok\n");return 0;
exit:return -1;
}state parse_buf(char *buf, int len)
{// mbedtls_printf( " parse:%d\n",ftp_state);if (strstr(buf, "331 ")){ftp_state = PASS;goto exit;}if (strstr(buf, "234 ")){ftp_state = CTRL_HANDSHAKE;mbedtls_printf(" change state to CTRL_HANDSHAKE; \n");goto exit;}if (strstr(buf, "226 ") && ftp_state == IDLE){ftp_state = TYPE;mbedtls_printf(" change state to pasv \n");goto exit;}if (strstr(buf, "230 ") && ftp_state == PASS){// ftp_state=TYPE;// ftp_state=PBSZ;ftp_state = PROT; //没有这个会报7200的错误goto exit;}if (strstr(buf, "200 ") && ftp_state == TYPE){ftp_state = PASV;mbedtls_printf(" change state to pasv \n");goto exit;}if (strstr(buf, "200 ") && ftp_state == PBSZ){ftp_state = PROT;mbedtls_printf(" change state to pbsz \n");goto exit;}if (strstr(buf, "200 ") && ftp_state == PROT){ftp_state = TYPE;mbedtls_printf(" change state to prot \n");goto exit;}if (ftp_state == LIST){ftp_state = WAIT_HANDSHAKE;goto exit;}if (strstr(buf, "227 ")){char *p = NULL;if (p = strstr(buf, "121.75.13.180")){char *q = p + 14;printf("%s", q);int first = 0, second = 0;sscanf(q, "%d,%d)", &first, &second);printf("%d %d\n", first, second);int port = 0;port = first * 256 + second;sprintf(data_port, "%d", port);printf("%d %s\n", port, data_port);}ftp_state = LIST;goto exit;}// ftp_state = IDLE;exit:// mbedtls_printf( " %s %d end\n",buf,ftp_state);return ftp_state;
}static void _free(mbedtls_net_context *server_fd, mbedtls_ssl_context *ssl, mbedtls_ssl_config *conf, mbedtls_x509_crt *cacert, mbedtls_ctr_drbg_context *ctr_drbg, mbedtls_entropy_context *entropy)
{mbedtls_ssl_close_notify(ssl);mbedtls_net_free(server_fd);mbedtls_x509_crt_free(cacert);mbedtls_ssl_free(ssl);mbedtls_ssl_config_free(conf);mbedtls_ctr_drbg_free(ctr_drbg);mbedtls_entropy_free(entropy);
}static void _init(mbedtls_net_context *server_fd, mbedtls_ssl_context *ssl, mbedtls_ssl_config *conf, mbedtls_x509_crt *cacert, mbedtls_ctr_drbg_context *ctr_drbg, mbedtls_entropy_context *entropy)
{const char *pers = "ssl_client1";mbedtls_net_init(server_fd);mbedtls_ssl_init(ssl);mbedtls_ssl_config_init(conf);mbedtls_x509_crt_init(cacert);mbedtls_ctr_drbg_init(ctr_drbg);mbedtls_entropy_init(entropy);int ret = 0;if ((ret = mbedtls_ctr_drbg_seed(ctr_drbg, mbedtls_entropy_func, entropy,(const unsigned char *)pers,strlen(pers))) != 0){mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret);goto exit;}
exit:return;
}static int write_ssl_data(mbedtls_ssl_context *ssl, unsigned char *buf, size_t len)
{int ret;mbedtls_printf("\n%s", buf);while (len && (ret = mbedtls_ssl_write(ssl, buf, len)) <= 0){if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE){mbedtls_printf(" failed\n  ! mbedtls_ssl_write returned %d\n\n", ret);return -1;}}return (0);
}static int do_handshake_(mbedtls_ssl_context *ssl)
{int ret;uint32_t flags;unsigned char buf[1024];memset(buf, 0, 1024);/** 4. Handshake*/mbedtls_printf("  . Performing the SSL/TLS handshake...");fflush(stdout);while ((ret = mbedtls_ssl_handshake(ssl)) != 0){if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE){#if defined(MBEDTLS_ERROR_C)mbedtls_strerror(ret, (char *)buf, 1024);
#endifmbedtls_printf(" failed\n  ! mbedtls_ssl_handshake returned %d: %s\n\n", ret, buf);return (-1);}}mbedtls_printf(" ok\n    [ Ciphersuite is %s ]\n",mbedtls_ssl_get_ciphersuite(ssl));/** 5. Verify the server certificate*/mbedtls_printf("  . Verifying peer X.509 certificate...");/* In real life, we probably want to bail out when ret != 0 */if ((flags = mbedtls_ssl_get_verify_result(ssl)) != 0){#if !defined(MBEDTLS_X509_REMOVE_INFO)char vrfy_buf[512];
#endifmbedtls_printf(" failed\n");#if !defined(MBEDTLS_X509_REMOVE_INFO)mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "  ! ", flags);mbedtls_printf("%s\n", vrfy_buf);
#endif}elsembedtls_printf(" ok\n");#if !defined(MBEDTLS_X509_REMOVE_INFO)mbedtls_printf("  . Peer certificate information    ...\n");mbedtls_x509_crt_info((char *)buf, sizeof(buf) - 1, "      ",mbedtls_ssl_get_peer_cert(ssl));mbedtls_printf("%s\n", buf);
#endifreturn (0);
}int main(void)
{int ret = 1, len;int exit_code = MBEDTLS_EXIT_FAILURE;mbedtls_net_context server_fd;mbedtls_net_context data_fd;uint32_t flags;unsigned char buf[1024];const char *pers = "ssl_client1";mbedtls_entropy_context entropy;mbedtls_ctr_drbg_context ctr_drbg;mbedtls_ssl_context ssl;mbedtls_ssl_config conf;mbedtls_x509_crt cacert;mbedtls_entropy_context entropy_1;mbedtls_ctr_drbg_context ctr_drbg_1;mbedtls_ssl_context ssl_1;mbedtls_ssl_config conf_1;mbedtls_x509_crt cacert_1;#if defined(MBEDTLS_DEBUG_C)mbedtls_debug_set_threshold(DEBUG_LEVEL);
#endif/** 0. Initialize the RNG and the session data*/mbedtls_net_init(&server_fd);mbedtls_ssl_init(&ssl);mbedtls_ssl_config_init(&conf);mbedtls_x509_crt_init(&cacert);mbedtls_ctr_drbg_init(&ctr_drbg);mbedtls_printf("\n  . Seeding the random number generator...");fflush(stdout);mbedtls_entropy_init(&entropy);if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,(const unsigned char *)pers,strlen(pers))) != 0){mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret);goto exit;}mbedtls_printf(" ok\n");/** 0. Initialize certificates*/mbedtls_printf("  . Loading the CA root certificate ...");fflush(stdout);ret = mbedtls_x509_crt_parse(&cacert, (const unsigned char *)mbedtls_test_cas_pem,mbedtls_test_cas_pem_len);if (ret < 0){mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int)-ret);goto exit;}ret = mbedtls_x509_crt_parse(&cacert_1, (const unsigned char *)mbedtls_test_cas_pem,mbedtls_test_cas_pem_len);if (ret < 0){mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int)-ret);goto exit;}mbedtls_printf(" ok (%d skipped)\n", ret);/** 1. Start the connection*/mbedtls_printf("  . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT);fflush(stdout);if ((ret = mbedtls_net_connect(&server_fd, SERVER_NAME,SERVER_PORT, MBEDTLS_NET_PROTO_TCP)) != 0){mbedtls_printf(" failed\n  ! mbedtls_net_connect returned %d\n\n", ret);goto exit;}mbedtls_printf(" ok\n");/** 2. Setup stuff*/mbedtls_printf("  . Setting up the SSL/TLS structure...");fflush(stdout);if ((ret = mbedtls_ssl_config_defaults(&conf,MBEDTLS_SSL_IS_CLIENT,MBEDTLS_SSL_TRANSPORT_STREAM,MBEDTLS_SSL_PRESET_DEFAULT)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret);goto exit;}mbedtls_ssl_conf_min_version(&conf, MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3);mbedtls_ssl_conf_max_version(&conf, MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3);mbedtls_printf(" ok\n");/* OPTIONAL is not optimal for security,* but makes interop easier in this simplified example */mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_OPTIONAL);mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret);goto exit;}if ((ret = mbedtls_ssl_set_hostname(&ssl, SERVER_NAME)) != 0){mbedtls_printf(" failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret);goto exit;}mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);/** 4. Handshake*/mbedtls_printf("  . Performing the SSL/TLS handshake...");fflush(stdout);mbedtls_printf(" ok\n");/** 5. Verify the server certificate*/mbedtls_printf("  . Verifying peer X.509 certificate...");/* In real life, we probably want to bail out when ret != 0 */if ((flags = mbedtls_ssl_get_verify_result(&ssl)) != 0){#if !defined(MBEDTLS_X509_REMOVE_INFO)char vrfy_buf[512];
#endifmbedtls_printf(" failed\n");#if !defined(MBEDTLS_X509_REMOVE_INFO)mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "  ! ", flags);mbedtls_printf("%s\n", vrfy_buf);
#endif}elsembedtls_printf(" ok\n");/** 3. Write the GET request*/mbedtls_printf("  > Write to server:");fflush(stdout);/** 7. Read the HTTP response*/mbedtls_printf("  < Read from server:");fflush(stdout);int first = 0;// mbedtls_ssl_write( &ssl, "USER admin\r\n", 12);// mbedtls_net_send( &server_fd, "AUTH TLS\r\n",10 );mbedtls_net_send(&server_fd, "AUTH TLS\r\n", 10);struct timeval tm;struct timeval *tm_ptr = NULL;fd_set read_fds;// fd_set write_fds;int max_wait = 2000;tm.tv_sec = max_wait / 1000;tm.tv_usec = (max_wait % 1000) * 1000;tm_ptr = &tm;int encrypt = 0;if (nb_fds < server_fd.fd)nb_fds = server_fd.fd;if (nb_fds < data_fd.fd)nb_fds = data_fd.fd;++nb_fds;int ok = 0;while (1){FD_ZERO(&read_fds);if (server_fd.fd > 0){FD_SET(server_fd.fd, &read_fds);}if(data_fd.fd > 0){FD_SET( data_fd.fd, &read_fds );}if ((ret = select(nb_fds, &read_fds, NULL, NULL, tm_ptr)) < 0){perror("select");goto exit;}if (data_fd.fd != -1 && FD_ISSET(data_fd.fd, &read_fds)){char buf1[1024] = {0};mbedtls_net_set_nonblock(&ssl_1);int ret1 = mbedtls_ssl_read(&ssl_1, buf1, 1023);if (ret1 > 0){printf("recv:\n%s\n", buf1);}else if (ret1 == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY){printf("ret1 < 0 :%d\n", ret1);_free(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1, &entropy_1);mbedtls_net_set_nonblock(&ssl);ftp_state = IDLE;}else if (ret1 == 0){printf("ret1 = 0 :%d\n", ret1);_free(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1, &entropy_1);mbedtls_net_set_nonblock(&ssl);ftp_state = IDLE;}}if (FD_ISSET(server_fd.fd, &read_fds)){printf("=====%d ", nb_fds);len = sizeof(buf) - 1;memset(buf, 0, sizeof(buf));mbedtls_net_set_nonblock(&ssl);if (encrypt == 0){ret = mbedtls_net_recv(&server_fd, buf, len);}else{ret = mbedtls_ssl_read(&ssl, buf, len);}if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE)continue;if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)break;if (ret < 0){mbedtls_printf("failed\n  ! mbedtls_ssl_read returned %d\n\n", ret);break;}if (ret == 0){mbedtls_printf("\n\nEOF\n\n");break;}len = ret;mbedtls_printf(" %d bytes read\n\n%s", len, (char *)buf);switch (parse_buf(buf, len)){case CTRL_HANDSHAKE:do_handshake_(&ssl);if (write_ssl_data(&ssl, "USER root\r\n", 11) == 0)mbedtls_printf("write success\n");ftp_state = USER;encrypt = 1;break;case PASS:mbedtls_ssl_write(&ssl, "PASS admin12345.\r\n", 18);break;case TYPE:mbedtls_ssl_write(&ssl, "TYPE A\r\n", 8);break;case PBSZ:mbedtls_ssl_write(&ssl, "PBSZ 0\r\n", 8);break;case PROT:mbedtls_ssl_write(&ssl, "PROT P\r\n", 8);break;case PASV:mbedtls_printf(" in pasv\n");mbedtls_ssl_write(&ssl, "PASV\r\n", 6);break;case LIST:mbedtls_net_set_nonblock(&ssl_1);_init(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1, &entropy_1);do_connect(&data_fd);mbedtls_printf(" in list\n");if (write_ssl_data(&ssl, "LIST .\r\n", 8) != 0){mbedtls_printf("write fail\n ");}break;case WAIT_HANDSHAKE:if (do_handshake(&data_fd, &ssl_1, &conf_1, &cacert_1, &ctr_drbg_1) == 0){mbedtls_printf("success data handshake\n ");}break;default:break;}}}mbedtls_ssl_close_notify(&ssl);exit_code = MBEDTLS_EXIT_SUCCESS;exit:#ifdef MBEDTLS_ERROR_Cif (exit_code != MBEDTLS_EXIT_SUCCESS){char error_buf[100];mbedtls_strerror(ret, error_buf, 100);mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);}
#endifmbedtls_net_free(&server_fd);mbedtls_x509_crt_free(&cacert);mbedtls_ssl_free(&ssl);mbedtls_ssl_config_free(&conf);mbedtls_ctr_drbg_free(&ctr_drbg);mbedtls_entropy_free(&entropy);#if defined(_WIN32)mbedtls_printf("  + Press Enter to exit this program.\n");fflush(stdout);getchar();
#endifmbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C && \MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&        \MBEDTLS_PEM_PARSE_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C */

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