4 year old code to talk to a DeveloperDiskImage service

fetchsymbols.c

#include "MobileDevice.h"
#include <assert.h>
#include <unistd.h>
#include <sys/socket.h>

#define bswap32 __builtin_bswap32
static uint32_t read32(int fd) {
    uint32_t ret;
    assert(read(fd, &ret, sizeof(ret)) == sizeof(ret));
    return bswap32(ret);
}

static void write32(int fd, uint32_t val) {
    val = bswap32(val);
    assert(write(fd, &val, sizeof(val)) == sizeof(val));
}

static int filenum;

static void cb(am_device_notification_callback_info *info, void *foo) {
    struct am_device *dev;
    if(info->msg == ADNCI_MSG_CONNECTED) {
        dev = info->dev;
        service_conn_t socket = 0;
        AMDeviceConnect(dev);
        assert(AMDeviceIsPaired(dev));
        assert(!AMDeviceValidatePairing(dev));
        assert(!AMDeviceStartSession(dev));

        assert(!AMDeviceStartService(dev, CFSTR("com.apple.dt.fetchsymbols"), (void*)&socket, NULL));

        if(filenum == -1) {
            write32(socket, 0);
            assert(read32(socket) == 0);
            uint32_t nitems = read32(socket);
            for(uint32_t i = 0; i < nitems; i++) {
                uint32_t length = read32(socket);
                void *buf = malloc(length);
                assert(read(socket, buf, length) == length);
                printf("%u: %*s\n", i, (int) length, (char *) buf);
                free(buf);
            }
        } else {
            write32(socket, 1);
            assert(read32(socket) == 1);
            write32(socket, (uint32_t) filenum);
            uint32_t err = read32(socket), length = read32(socket);
            fprintf(stderr, "%x\n", length);
            assert(!err);
            void *buf = malloc(length);
            assert(recv(socket, buf, length, MSG_WAITALL) == length);
            assert(write(1, buf, length) == length);
        }


        exit(0);
    }
}
int main(int argc, char **argv) {
    if(argv[1]) {
        filenum = atoi(argv[1]);
    } else {
        filenum = -1;
    }
        
    am_device_notification *notif;
    assert(!AMDeviceNotificationSubscribe(cb, 0, 0, NULL, &notif));
    CFRunLoopRun();
}