Will Drewry | d4ae528 | 2017-01-03 22:06:26 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | * |
| 16 | * Hack-y server to forward communication with an eSE during development. |
| 17 | * See README.md for more information. |
| 18 | */ |
| 19 | |
| 20 | #include <arpa/inet.h> |
| 21 | #include <linux/un.h> |
| 22 | #include <stdint.h> |
| 23 | #include <stdio.h> |
| 24 | #include <string.h> |
| 25 | #include <sys/socket.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #define LOG_TAG "ese-relay" |
| 29 | #include <ese/ese.h> |
| 30 | #include <ese/log.h> |
| 31 | |
| 32 | extern const uint8_t *kAtr; |
| 33 | extern size_t kAtrLength; |
| 34 | extern void *kEseOpenData; |
| 35 | void ese_relay_init(struct EseInterface *ese); |
| 36 | |
| 37 | /* |
| 38 | * Aligned with vpcd.h in |
| 39 | * https://frankmorgner.github.io/vsmartcard/virtualsmartcard |
| 40 | */ |
| 41 | #define CMD_POWER_OFF 0 |
| 42 | #define CMD_POWER_ON 1 |
| 43 | #define CMD_RESET 2 |
| 44 | #define CMD_ATR 4 |
| 45 | |
| 46 | int setup_socket(const char *name) { |
| 47 | int fd; |
| 48 | struct sockaddr_un addr; |
| 49 | |
| 50 | memset(&addr, 0, sizeof(struct sockaddr_un)); |
| 51 | addr.sun_family = AF_UNIX; |
| 52 | if (strlen(name) > UNIX_PATH_MAX - 1) { |
| 53 | ALOGE("Abstract listener name too long."); |
| 54 | return -1; |
| 55 | } |
| 56 | strncpy(&addr.sun_path[1], name, strlen(name)); |
| 57 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
| 58 | if (fd == -1) { |
| 59 | ALOGE("Could not open socket."); |
| 60 | return fd; |
| 61 | } |
| 62 | if (bind(fd, (struct sockaddr *)&addr, |
| 63 | sizeof(sa_family_t) + strlen(name) + 1) == -1) { |
| 64 | ALOGE("Failed to bind to abstract socket name"); |
| 65 | close(fd); |
| 66 | return -1; |
| 67 | } |
| 68 | return fd; |
| 69 | } |
| 70 | |
| 71 | int main() { |
| 72 | int server_fd = setup_socket(LOG_TAG); |
Will Drewry | d4ae528 | 2017-01-03 22:06:26 -0600 | [diff] [blame] | 73 | struct EseInterface ese; |
| 74 | ese_relay_init(&ese); |
| 75 | |
| 76 | if (listen(server_fd, 4)) { |
| 77 | ALOGE("Failed to listen on socket."); |
| 78 | close(server_fd); |
| 79 | return -1; |
| 80 | } |
| 81 | |
| 82 | while (server_fd) { |
| 83 | struct sockaddr client_info; |
| 84 | socklen_t client_info_len = (socklen_t)sizeof(&client_info); |
| 85 | int client_fd; |
| 86 | uint32_t tx_len, data_read; |
| 87 | uint32_t rx_len; |
| 88 | uint16_t network_tx_len; |
| 89 | uint16_t network_rx_len; |
| 90 | uint8_t tx_buf[4096]; |
| 91 | uint8_t rx_buf[4096]; |
| 92 | int connected = 0; |
| 93 | |
| 94 | if ((client_fd = accept(server_fd, &client_info, &client_info_len)) == -1) { |
| 95 | ALOGE("Fatal error accept()ing a client connection."); |
| 96 | return -1; |
| 97 | } |
| 98 | printf("Client connected.\n"); |
| 99 | connected = 1; |
| 100 | if (ese_open(&ese, kEseOpenData)) { |
| 101 | ALOGE("Cannot open hw"); |
| 102 | if (ese_error(&ese)) |
| 103 | ALOGE("eSE error (%d): %s", ese_error_code(&ese), |
| 104 | ese_error_message(&ese)); |
| 105 | return 1; |
| 106 | } |
| 107 | printf("eSE is open\n"); |
| 108 | |
| 109 | while (connected) { |
| 110 | printf("Listening for data from client\n"); |
| 111 | if (read(client_fd, &network_tx_len, sizeof(network_tx_len)) != |
| 112 | sizeof(network_tx_len)) { |
| 113 | ALOGE("Client disconnected."); |
| 114 | break; |
| 115 | } |
| 116 | tx_len = (uint32_t)ntohs(network_tx_len); |
| 117 | printf("tx_len: %u\n", tx_len); |
| 118 | if (tx_len == 0) { |
| 119 | ALOGE("Client had nothing to say. Goodbye."); |
| 120 | break; |
| 121 | } |
| 122 | if (tx_len > sizeof(tx_buf)) { |
| 123 | ALOGE("Client payload too large: %u", tx_len); |
| 124 | break; |
| 125 | } |
| 126 | for (data_read = 0; data_read < tx_len;) { |
| 127 | printf("Reading payload: %u of %u remaining\n", data_read, tx_len); |
| 128 | ssize_t bytes = read(client_fd, tx_buf + data_read, tx_len - data_read); |
| 129 | if (bytes < 0) { |
| 130 | ALOGE("Client abandoned hope during transmission."); |
| 131 | connected = 0; |
| 132 | break; |
| 133 | } |
| 134 | data_read += bytes; |
| 135 | } |
| 136 | /* Finally, we can transcieve. */ |
| 137 | if (tx_len) { |
| 138 | uint32_t i; |
| 139 | printf("Sending %u bytes to card\n", tx_len); |
| 140 | printf("TX: "); |
| 141 | for (i = 0; i < tx_len; ++i) |
| 142 | printf("%.2X ", tx_buf[i]); |
| 143 | printf("\n"); |
| 144 | } |
| 145 | |
| 146 | if (tx_len == 1) { /* Control request */ |
| 147 | printf("Received a control request: %x\n", tx_buf[0]); |
| 148 | rx_len = 0; |
| 149 | switch (tx_buf[0]) { |
| 150 | case CMD_POWER_OFF: |
| 151 | ese.ops->hw_reset(&ese); |
| 152 | break; |
| 153 | case CMD_POWER_ON: |
| 154 | break; |
| 155 | case CMD_RESET: |
| 156 | ese.ops->hw_reset(&ese); |
| 157 | break; |
| 158 | case CMD_ATR: |
| 159 | /* Send a dummy ATR for another JCOP card */ |
| 160 | rx_len = kAtrLength; |
| 161 | printf("Filling card RX buf with fake ATR (%u)\n", rx_len); |
| 162 | memcpy(rx_buf, kAtr, rx_len); |
| 163 | printf("Sending back ATR of length %u\n", rx_len); |
| 164 | break; |
| 165 | default: |
| 166 | ALOGE("Unknown control byte seen: %x", tx_buf[0]); |
| 167 | } |
| 168 | if (!rx_len) |
| 169 | continue; |
| 170 | } else { |
| 171 | rx_len = ese_transceive(&ese, tx_buf, tx_len, rx_buf, sizeof(rx_buf)); |
| 172 | if (ese_error(&ese)) { |
| 173 | ALOGE("An error (%d) occurred: %s", ese_error_code(&ese), |
| 174 | ese_error_message(&ese)); |
| 175 | return -1; |
| 176 | } |
| 177 | } |
| 178 | if (rx_len > 0) { |
| 179 | uint32_t i; |
| 180 | printf("Read %d bytes from card\n", rx_len); |
| 181 | printf("RX: "); |
| 182 | for (i = 0; i < rx_len; ++i) |
| 183 | printf("%.2X ", rx_buf[i]); |
| 184 | printf("\n"); |
| 185 | } |
| 186 | |
| 187 | /* Send to client */ |
| 188 | network_rx_len = htons((uint16_t)rx_len); |
| 189 | if (write(client_fd, &network_rx_len, sizeof(network_rx_len)) != |
| 190 | sizeof(network_rx_len)) { |
| 191 | ALOGE("Client abandoned hope during response size."); |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | for (data_read = 0; data_read < rx_len;) { |
| 196 | ssize_t bytes = |
| 197 | write(client_fd, rx_buf + data_read, rx_len - data_read); |
| 198 | if (bytes < 0) { |
| 199 | ALOGE("Client abandoned hope during response."); |
| 200 | connected = 0; |
| 201 | break; |
| 202 | } |
| 203 | data_read += bytes; |
| 204 | } |
| 205 | usleep(1000); |
| 206 | } |
| 207 | close(client_fd); |
| 208 | printf("Session ended\n\n"); |
| 209 | ese_close(&ese); |
| 210 | } |
| 211 | return 0; |
| 212 | } |