scrcpy/app/src/adb_parser.c
Romain Vimont f609b406c9 Add function to find the device IP address
Parse the result of "adb shell ip route" to find the device IP address.

PR #2827 <https://github.com/Genymobile/scrcpy/pull/2827>
2021-11-29 20:39:03 +01:00

65 lines
1.9 KiB
C

#include "adb_parser.h"
#include <assert.h>
#include <string.h>
#include "util/log.h"
#include "util/str.h"
static char *
sc_adb_parse_device_ip_from_line(char *line, size_t len) {
// One line from "ip route" looks lile:
// "192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.x"
// Get the location of the device name (index of "wlan0" in the example)
ssize_t idx_dev_name = sc_str_index_of_column(line, 2, " ");
if (idx_dev_name == -1) {
return NULL;
}
// Get the location of the ip address (column 8, but column 6 if we start
// from column 2). Must be computed before truncating individual columns.
ssize_t idx_ip = sc_str_index_of_column(&line[idx_dev_name], 6, " ");
if (idx_ip == -1) {
return NULL;
}
// idx_ip is searched from &line[idx_dev_name]
idx_ip += idx_dev_name;
char *dev_name = &line[idx_dev_name];
sc_str_truncate(dev_name, len - idx_dev_name + 1, " \t");
char *ip = &line[idx_ip];
sc_str_truncate(ip, len - idx_ip + 1, " \t");
// Only consider lines where the device name starts with "wlan"
if (strncmp(dev_name, "wlan", sizeof("wlan") - 1)) {
LOGD("Device ip lookup: ignoring %s (%s)", ip, dev_name);
return NULL;
}
return strdup(ip);
}
char *
sc_adb_parse_device_ip_from_output(char *buf, size_t buf_len) {
size_t idx_line = 0;
while (idx_line < buf_len && buf[idx_line] != '\0') {
char *line = &buf[idx_line];
size_t len = sc_str_truncate(line, buf_len - idx_line, "\n");
// The same, but without any trailing '\r'
size_t line_len = sc_str_remove_trailing_cr(line, len);
char *ip = sc_adb_parse_device_ip_from_line(line, line_len);
if (ip) {
// Found
return ip;
}
// The next line starts after the '\n' (replaced by `\0`)
idx_line += len + 1;
}
return NULL;
}