Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 1 | /* libcutils/qtaguid.c |
| 2 | ** |
| 3 | ** Copyright 2011, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
JP Abgrall | 29656d3 | 2011-09-22 14:25:10 -0700 | [diff] [blame] | 18 | // #define LOG_NDEBUG 0 |
| 19 | |
Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 20 | #define LOG_TAG "qtaguid" |
| 21 | |
| 22 | #include <cutils/qtaguid.h> |
| 23 | #include <cutils/log.h> |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 24 | #include <errno.h> |
Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 25 | #include <fcntl.h> |
| 26 | #include <stdio.h> |
| 27 | #include <string.h> |
| 28 | #include <unistd.h> |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 29 | #include <pthread.h> |
Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 30 | |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 31 | static const char* CTRL_PROCPATH = "/proc/net/xt_qtaguid/ctrl"; |
| 32 | static const int CTRL_MAX_INPUT_LEN = 128; |
| 33 | static const char *GLOBAL_PACIFIER_PARAM = "/sys/module/xt_qtaguid/parameters/passive"; |
| 34 | static const char *TAG_PACIFIER_PARAM = "/sys/module/xt_qtaguid/parameters/tag_tracking_passive"; |
Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 35 | |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 36 | /* |
| 37 | * One per proccess. |
| 38 | * Once the device is open, this process will have its socket tags tracked. |
| 39 | * And on exit or untimely death, all socket tags will be removed. |
| 40 | * A process can only open /dev/xt_qtaguid once. |
| 41 | * It should not close it unless it is really done with all the socket tags. |
| 42 | * Failure to open it will be visible when socket tagging will be attempted. |
| 43 | */ |
| 44 | static int resTrackFd = -1; |
| 45 | pthread_once_t resTrackInitDone = PTHREAD_ONCE_INIT; |
| 46 | |
| 47 | /* Only call once per process. */ |
| 48 | void qtaguid_resTrack(void) { |
| 49 | resTrackFd = TEMP_FAILURE_RETRY(open("/dev/xt_qtaguid", O_RDONLY)); |
| 50 | if (resTrackFd >=0) { |
| 51 | TEMP_FAILURE_RETRY(fcntl(resTrackFd, F_SETFD, FD_CLOEXEC)); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | /* |
| 56 | * Returns: |
| 57 | * 0 on success. |
| 58 | * -errno on failure. |
| 59 | */ |
| 60 | static int write_ctrl(const char *cmd) { |
| 61 | int fd, res, savedErrno; |
| 62 | |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 63 | ALOGV("write_ctrl(%s)", cmd); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 64 | |
| 65 | fd = TEMP_FAILURE_RETRY(open(CTRL_PROCPATH, O_WRONLY)); |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 66 | if (fd < 0) { |
| 67 | return -errno; |
| 68 | } |
Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 69 | |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 70 | res = TEMP_FAILURE_RETRY(write(fd, cmd, strlen(cmd))); |
| 71 | if (res < 0) { |
| 72 | savedErrno = errno; |
| 73 | } else { |
| 74 | savedErrno = 0; |
| 75 | } |
| 76 | if (res < 0) { |
Steve Block | fe71a61 | 2012-01-04 19:19:03 +0000 | [diff] [blame^] | 77 | ALOGI("Failed write_ctrl(%s) res=%d errno=%d", cmd, res, savedErrno); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 78 | } |
| 79 | close(fd); |
| 80 | return -savedErrno; |
| 81 | } |
| 82 | |
| 83 | static int write_param(const char *param_path, const char *value) { |
| 84 | int param_fd; |
| 85 | int res; |
| 86 | |
| 87 | param_fd = TEMP_FAILURE_RETRY(open(param_path, O_WRONLY)); |
| 88 | if (param_fd < 0) { |
| 89 | return -errno; |
| 90 | } |
| 91 | res = TEMP_FAILURE_RETRY(write(param_fd, value, strlen(value))); |
| 92 | if (res < 0) { |
| 93 | return -errno; |
| 94 | } |
| 95 | close(param_fd); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | int qtaguid_tagSocket(int sockfd, int tag, uid_t uid) { |
| 100 | char lineBuf[CTRL_MAX_INPUT_LEN]; |
| 101 | int res; |
| 102 | /* Doing java-land a favor, enforcing "long" */ |
| 103 | uint64_t kTag = ((uint64_t)tag << 32) & ~(1LLU<<63); |
| 104 | |
| 105 | |
| 106 | pthread_once(&resTrackInitDone, qtaguid_resTrack); |
| 107 | |
| 108 | snprintf(lineBuf, sizeof(lineBuf), "t %d %llu %d", sockfd, kTag, uid); |
| 109 | |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 110 | ALOGV("Tagging socket %d with tag %llx{%u,0} for uid %d", sockfd, kTag, tag, uid); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 111 | |
| 112 | res = write_ctrl(lineBuf); |
| 113 | if (res < 0) { |
Steve Block | fe71a61 | 2012-01-04 19:19:03 +0000 | [diff] [blame^] | 114 | ALOGI("Tagging socket %d with tag %llx(%d) for uid %d failed errno=%d", |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 115 | sockfd, kTag, tag, uid, res); |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 118 | return res; |
| 119 | } |
| 120 | |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 121 | int qtaguid_untagSocket(int sockfd) { |
| 122 | char lineBuf[CTRL_MAX_INPUT_LEN]; |
| 123 | int res; |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 124 | |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 125 | ALOGV("Untagging socket %d", sockfd); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 126 | |
| 127 | snprintf(lineBuf, sizeof(lineBuf), "u %d", sockfd); |
| 128 | res = write_ctrl(lineBuf); |
| 129 | if (res < 0) { |
Steve Block | fe71a61 | 2012-01-04 19:19:03 +0000 | [diff] [blame^] | 130 | ALOGI("Untagging socket %d failed errno=%d", sockfd, res); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | return res; |
| 134 | } |
| 135 | |
| 136 | int qtaguid_setCounterSet(int counterSetNum, uid_t uid) { |
| 137 | char lineBuf[CTRL_MAX_INPUT_LEN]; |
| 138 | int res; |
| 139 | |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 140 | ALOGV("Setting counters to set %d for uid %d", counterSetNum, uid); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 141 | |
| 142 | snprintf(lineBuf, sizeof(lineBuf), "s %d %d", counterSetNum, uid); |
| 143 | res = write_ctrl(lineBuf); |
| 144 | return res; |
| 145 | } |
| 146 | |
| 147 | int qtaguid_deleteTagData(int tag, uid_t uid) { |
| 148 | char lineBuf[CTRL_MAX_INPUT_LEN]; |
| 149 | int fd, cnt = 0, res = 0; |
| 150 | uint64_t kTag = (uint64_t)tag << 32; |
| 151 | |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 152 | ALOGV("Deleting tag data with tag %llx{%d,0} for uid %d", kTag, tag, uid); |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 153 | |
| 154 | pthread_once(&resTrackInitDone, qtaguid_resTrack); |
| 155 | |
| 156 | snprintf(lineBuf, sizeof(lineBuf), "d %llu %d", kTag, uid); |
| 157 | res = write_ctrl(lineBuf); |
| 158 | if (res < 0) { |
Steve Block | fe71a61 | 2012-01-04 19:19:03 +0000 | [diff] [blame^] | 159 | ALOGI("Deleteing tag data with tag %llx/%d for uid %d failed with cnt=%d errno=%d", |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 160 | kTag, tag, uid, cnt, errno); |
| 161 | } |
| 162 | |
| 163 | return res; |
| 164 | } |
| 165 | |
| 166 | int qtaguid_setPacifier(int on) { |
| 167 | int param_fd; |
| 168 | int res; |
| 169 | const char *value; |
| 170 | |
| 171 | value = on ? "Y" : "N"; |
| 172 | if (write_param(GLOBAL_PACIFIER_PARAM, value) < 0) { |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 173 | return -errno; |
| 174 | } |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 175 | if (write_param(TAG_PACIFIER_PARAM, value) < 0) { |
| 176 | return -errno; |
Ashish Sharma | 9b5c774 | 2011-08-03 00:31:19 -0700 | [diff] [blame] | 177 | } |
JP Abgrall | 243123f | 2011-09-09 15:02:08 -0700 | [diff] [blame] | 178 | return 0; |
Ashish Sharma | 8626cce | 2011-07-07 18:16:01 -0700 | [diff] [blame] | 179 | } |