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server: don't do misaligned loads

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Daniel Eklöf 2020-04-18 12:20:28 +02:00
parent 544d8fe5f9
commit 02edee78b2
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GPG key ID: 5BBD4992C116573F
1 changed files with 23 additions and 11 deletions
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34
server.c
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@ -200,8 +200,10 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
uint8_t *p = client->buffer.data;
const uint8_t *end = &client->buffer.data[client->buffer.idx];
CHECK_BUF(sizeof(uint16_t));
uint16_t cwd_len = *(uint16_t *)p; p += sizeof(cwd_len);
uint16_t cwd_len;
CHECK_BUF(sizeof(cwd_len));
memcpy(&cwd_len, p, sizeof(cwd_len));
p += sizeof(cwd_len);
CHECK_BUF(cwd_len);
const char *cwd = (const char *)p; p += cwd_len;
@ -213,8 +215,10 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
goto shutdown;
}
CHECK_BUF(sizeof(uint16_t));
uint16_t term_env_len = *(uint16_t *)p; p += sizeof(term_env_len);
uint16_t term_env_len;
CHECK_BUF(sizeof(term_env_len));
memcpy(&term_env_len, p, sizeof(term_env_len));
p += sizeof(term_env_len);
CHECK_BUF(term_env_len);
const char *term_env = (const char *)p; p += term_env_len;
@ -226,8 +230,10 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
goto shutdown;
}
CHECK_BUF(sizeof(uint16_t));
uint16_t title_len = *(uint16_t *)p; p += sizeof(title_len);
uint16_t title_len;
CHECK_BUF(sizeof(title_len));
memcpy(&title_len, p, sizeof(title_len));
p += sizeof(title_len);
CHECK_BUF(title_len);
const char *title = (const char *)p; p += title_len;
@ -239,8 +245,10 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
goto shutdown;
}
CHECK_BUF(sizeof(uint16_t));
uint16_t app_id_len = *(uint16_t *)p; p += sizeof(app_id_len);
uint16_t app_id_len;
CHECK_BUF(sizeof(app_id_len));
memcpy(&app_id_len, p, sizeof(app_id_len));
p += sizeof(app_id_len);
CHECK_BUF(app_id_len);
const char *app_id = (const char *)p; p += app_id_len;
@ -262,13 +270,17 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
const uint8_t login_shell = *(const uint8_t *)p; p += sizeof(login_shell);
CHECK_BUF(sizeof(argc));
argc = *(int *)p; p += sizeof(argc);
memcpy(&argc, p, sizeof(argc));
p += sizeof(argc);
argv = calloc(argc + 1, sizeof(argv[0]));
LOG_DBG("argc = %d", argc);
for (int i = 0; i < argc; i++) {
CHECK_BUF(sizeof(uint16_t));
uint16_t len = *(uint16_t *)p; p += sizeof(len);
uint16_t len;
CHECK_BUF(sizeof(len));
memcpy(&len, p, sizeof(len));
p += sizeof(len);
CHECK_BUF(len);
argv[i] = (char *)p; p += strlen(argv[i]) + 1;