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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mem/io.h"
#include "mem/io-stream.h"
#include "util.h"
static void
usage(const char *argv0)
{
fprintf(stderr, "usage: %s pid map regions data [offset] [len]\n"
" %s pid write regions data [offset] [len]\n"
" %s pid read regions [offset] [len]\n"
" regions must be in /proc/<pid>/maps format", argv0, argv0, argv0);
exit(EXIT_FAILURE);
}
struct context {
struct {
size_t offset, len;
bool has_offset, has_len;
enum {
MODE_MAP,
MODE_WRITE,
MODE_READ
} mode;
} op;
struct mem_io io;
FILE *regions, *data;
size_t data_len, trw;
};
static inline void
context_init(struct context *ctx, size_t argc, const char *argv[])
{
size_t arg = 0;
*ctx = (struct context){0};
{
bool m = false, w = false, r = false;
const char *mode = argv[arg++];
if (!(m = !strcmp(mode, "map")) && !(w = !strcmp(mode, "write")) && !(r = !strcmp(mode, "read")))
errx(EXIT_FAILURE, "mode must be map, write or read");
ctx->op.mode = (m ? MODE_MAP : (w ? MODE_WRITE : MODE_READ));
}
const char *regions_fname = argv[arg++], *data_fname = NULL;
if (ctx->op.mode != MODE_READ && argc >= arg + 1)
data_fname = argv[arg++];
if (argc >= arg + 1) {
ctx->op.offset = hexdecstrtoull(argv[arg++], NULL);
ctx->op.has_offset = true;
}
if (argc >= arg + 1) {
ctx->op.len = hexdecstrtoull(argv[arg++], NULL);
ctx->op.has_len = true;
}
if (!(ctx->regions = fopen(regions_fname, "rb")))
err(EXIT_FAILURE, "fopen(%s)", regions_fname);
if (data_fname) {
if (!(ctx->data = fopen(data_fname, "rb")))
err(EXIT_FAILURE, "fopen(%s)", data_fname);
if (fseek(ctx->data, 0, SEEK_END) != 0)
err(EXIT_FAILURE, "fseek");
ctx->data_len = ftell(ctx->data);
}
}
static void
context_release(struct context *ctx)
{
if (ctx->regions)
fclose(ctx->regions);
if (ctx->data)
fclose(ctx->data);
*ctx = (struct context){0};
}
static void
region_cb(const char *line, void *data)
{
struct context *ctx = data;
struct region region;
if (!region_parse(®ion, line))
return;
warnx("%s", line);
region.start += ctx->op.offset;
region.offset *= (ctx->op.mode == MODE_MAP);
if (region.start > region.end) {
warnx("write offset 0x%zx is out of bounds", region.start);
return;
}
const size_t rlen = (ctx->op.has_len ? ctx->op.len : (ctx->op.mode == MODE_READ ? region.end - region.start : ctx->data_len));
const size_t len = (rlen > region.end - region.start ? region.end - region.start : rlen);
if (!len)
return;
if (ctx->op.mode == MODE_MAP || ctx->op.mode == MODE_WRITE) {
if (fseek(ctx->data, region.offset, SEEK_SET) != 0)
err(EXIT_FAILURE, "fseek");
struct mem_io_istream stream = mem_io_istream_from_file(ctx->data);
const size_t wd = mem_io_write_from_stream(&ctx->io, &stream, region.start, len);
ctx->trw += wd;
if (ctx->op.mode == MODE_WRITE) {
if (rlen > wd) {
warnx("wrote %zu bytes (%zu bytes truncated) to offset 0x%zx", wd, rlen - wd, region.start);
} else {
warnx("wrote %zu bytes to offset 0x%zx", wd, region.start);
}
} else {
if (rlen > wd) {
warnx("mapped %zu bytes (%zu bytes truncated) from offset 0x%zx to offset 0x%zx", wd, rlen - wd, region.offset, region.start);
} else {
warnx("mapped %zu bytes from offset 0x%zx to offset 0x%zx", wd, region.offset, region.start);
}
}
} else {
struct mem_io_ostream stream = mem_io_ostream_from_file(stdout);
ctx->trw += mem_io_read_to_stream(&ctx->io, &stream, region.start, len);
}
}
int
proc_region_rw(int argc, const char *argv[], bool (*mem_io_init)(struct mem_io*, const pid_t))
{
if (argc < 4)
usage(argv[0]);
const pid_t pid = strtoull(argv[1], NULL, 10);
struct context ctx;
context_init(&ctx, argc - 2, argv + 2);
if (!mem_io_init(&ctx.io, pid))
return EXIT_FAILURE;
for_each_token_in_file(ctx.regions, '\n', region_cb, &ctx);
const size_t trw = ctx.trw;
mem_io_release(&ctx.io);
context_release(&ctx);
return trw;
}
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